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CN115021597B - Differential power unit control device and control method in dual-input inverter - Google Patents

Differential power unit control device and control method in dual-input inverter Download PDF

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Publication number
CN115021597B
CN115021597B CN202210522776.4A CN202210522776A CN115021597B CN 115021597 B CN115021597 B CN 115021597B CN 202210522776 A CN202210522776 A CN 202210522776A CN 115021597 B CN115021597 B CN 115021597B
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power unit
voltage
signal
digital
input
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CN115021597A (en
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姚志垒
沙琪园
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Shanghai Maritime University
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Shanghai Maritime University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0083—Converters characterised by their input or output configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

本发明公开了一种双输入逆变器中差值功率单元控制装置和控制方法，该控制装置包括：双输入逆变器电路和控制驱动单元，其中，控制驱动单元与双输入逆变器电路连接，其用于采集双输入逆变器电路中的第一光伏电池模块和第二光伏电池模块的电压反馈信号和电流反馈信号以及第一差值功率单元和第二差值功率单元输出的电压反馈信号，并根据电压反馈信号和电流反馈信号生成第一开关逻辑信号和第二开关逻辑信号，以根据第一开关逻辑信号和第二开关逻辑信号分别对第一差值功率单元和第二差值功率单元进行驱动控制。本发明能够解决阴影条件下逆变器母线电压不足的问题，并能够提高系统变换效率。

The present invention discloses a control device and a control method for a differential power unit in a dual-input inverter, wherein the control device comprises: a dual-input inverter circuit and a control drive unit, wherein the control drive unit is connected to the dual-input inverter circuit, and is used to collect voltage feedback signals and current feedback signals of a first photovoltaic cell module and a second photovoltaic cell module in the dual-input inverter circuit, and voltage feedback signals output by a first differential power unit and a second differential power unit, and generate a first switch logic signal and a second switch logic signal according to the voltage feedback signal and the current feedback signal, so as to drive and control the first differential power unit and the second differential power unit respectively according to the first switch logic signal and the second switch logic signal. The present invention can solve the problem of insufficient inverter bus voltage under shadow conditions, and can improve system conversion efficiency.

Description

Differential power unit control device and control method in dual-input inverter
Technical Field
The invention relates to the technical field of inverter control, in particular to a device and a method for controlling a difference power unit in a double-input inverter.
Background
The photovoltaic inverter is a core component of the photovoltaic power generation system, but in the case of partial shadow shielding or high temperature of the photovoltaic module, the voltage at the maximum power point of the photovoltaic cell array is reduced, and the input voltage may be smaller than the voltage peak of the power grid, so that the photovoltaic inverter is stopped due to undervoltage. The traditional method adopts two-stage conversion to realize boosting and reducing, namely, a mode of cascading a boosting converter and a photovoltaic inverter, but the method reduces the conversion efficiency of the system.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, a first object of the present invention is to provide a differential power unit control device in a dual input inverter, which can solve the problem of insufficient bus voltage of the inverter under shadow conditions and can improve system conversion efficiency.
A second object of the present invention is to provide a method for controlling a differential power unit in a dual-input inverter.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
A differential power unit control device in a dual input inverter, comprising:
The double-input inverter circuit comprises a first photovoltaic cell module, a second photovoltaic cell module, a first filter capacitor, a second filter capacitor, a first diode, a second diode, a first difference power unit, a second difference power unit, a double-input inverter and a load/power grid, wherein the positive electrode of the first photovoltaic cell module is respectively connected with the input positive end of the second difference power unit, one end of the first filter capacitor, the anode of the first diode and the output negative end of the first difference power unit; the negative electrode of the second photovoltaic cell module is respectively connected with the input negative end of the first difference power unit, the output positive end of the second difference power unit, the other end of the second filter capacitor and the negative end of the second filter capacitor, the negative electrode of the second photovoltaic cell module is respectively connected with the output positive end of the second difference power unit, the other end of the second filter capacitor and the negative electrode of the second diode;
The input end of the control driving unit is respectively connected with the output ends of the first photovoltaic battery module, the second photovoltaic battery module, the first difference power unit and the second difference power unit in the dual-input inverter circuit, the output end of the control driving unit is respectively connected with the control ends of the first difference power unit and the second difference power unit, and the control driving unit is used for collecting voltage feedback signals and current feedback signals of the first photovoltaic battery module and the second photovoltaic battery module and voltage feedback signals output by the first difference power unit and the second difference power unit, generating a first switch logic signal and a second switch logic signal according to the voltage feedback signals and the current feedback signals, and respectively controlling the driving of the first difference power unit and the second difference power unit according to the first switch logic signal and the second switch logic signal.
Optionally, the control driving unit includes:
The input end of the sensor component is respectively connected with the output ends of the first photovoltaic cell module, the second photovoltaic cell module, the first difference power unit and the second difference power unit, and the sensor component is used for respectively collecting first voltage feedback signals, second voltage feedback signals, first current feedback signals and second current feedback signals of the first photovoltaic cell module and the second photovoltaic cell module, and third voltage feedback signals and fourth voltage feedback signals respectively output by the first difference power unit and the second difference power unit;
The input end of the digital signal processor is connected with the first output end of the sensor assembly, and the digital signal processor is used for carrying out signal processing on the first voltage feedback signal, the second voltage feedback signal, the first current feedback signal and the second current feedback signal and generating a first voltage reference signal, a second voltage reference signal, a first operation selection signal and a second operation selection signal;
And the first input end of the control circuit is connected with the output end of the digital signal processor, the second input end of the control circuit is connected with the second output end of the sensor assembly, and the control circuit is used for generating the first switch logic signal according to the subtracted signal of the first voltage reference signal and the third voltage feedback signal and generating the second switch logic signal according to the subtracted signal of the second voltage reference signal and the fourth voltage feedback signal.
Optionally, the sensor assembly includes:
The input end of the first voltage sensor is connected with the first photovoltaic cell module, the output end of the first voltage sensor is connected with the input end of the digital signal processor, and the first voltage sensor is used for collecting the first voltage feedback signal and transmitting the first voltage feedback signal to the digital signal processor;
the input end of the second voltage sensor is connected with the second photovoltaic cell module, the output end of the second voltage sensor is connected with the input end of the digital signal processor, and the second voltage sensor is used for collecting the second voltage feedback signal and transmitting the second voltage feedback signal to the digital signal processor;
the input end of the first current sensor is connected with the first photovoltaic cell module, the output end of the first current sensor is connected with the input end of the digital signal processor, and the first current sensor is used for collecting the first current feedback signal and transmitting the first current feedback signal to the digital signal processor;
The input end of the second current sensor is connected with the second photovoltaic cell module, the output end of the second current sensor is connected with the input end of the digital signal processor, and the second current sensor is used for collecting the second current feedback signal and transmitting the second current feedback signal to the digital signal processor;
the input end of the third voltage sensor is connected with the output end of the first difference power unit, the output end of the third voltage sensor is connected with the input end of the control circuit, and the third voltage sensor is used for collecting the third voltage feedback signal and transmitting the third voltage feedback signal to the control circuit;
The input end of the fourth voltage sensor is connected with the output end of the second difference power unit, the output end of the fourth voltage sensor is connected with the input end of the control circuit, and the fourth voltage sensor is used for collecting the fourth voltage feedback signal and transmitting the fourth voltage feedback signal to the control circuit.
Optionally, the digital signal processor includes:
The input end of the first analog-to-digital conversion module is connected with the output end of the first voltage sensor, and the first analog-to-digital conversion module is used for carrying out analog-to-digital conversion on the first voltage feedback signal so as to obtain a first digital signal;
The input end of the second analog-to-digital conversion module is connected with the output end of the second voltage sensor, and the second analog-to-digital conversion module is used for carrying out analog-to-digital conversion on the second voltage feedback signal so as to obtain a second digital signal;
The input end of the third analog-to-digital conversion module is connected with the output end of the first current sensor, and the third analog-to-digital conversion module is used for performing analog-to-digital conversion on the first current feedback signal so as to obtain a third digital signal;
The input end of the fourth analog-to-digital conversion module is connected with the output end of the second current sensor, and the fourth analog-to-digital conversion module is used for carrying out analog-to-digital conversion on the second current feedback signal so as to obtain a fourth digital signal;
The input end of the power calculation module is respectively connected with the second output end of the first analog-to-digital conversion module, the second output end of the second analog-to-digital conversion module, the output end of the third analog-to-digital conversion module and the output end of the fourth analog-to-digital conversion module, and the power calculation module is used for carrying out power calculation on the first digital signal, the second digital signal, the third digital signal and the fourth digital signal so as to obtain a fifth digital signal;
The input end of the difference power unit control module is respectively connected with the first output end of the first analog-to-digital conversion module, the first output end of the second analog-to-digital conversion module and the output end of the power calculation module, and the difference power unit control module is used for carrying out digital processing on the first digital signal, the second digital signal and the fifth digital signal so as to obtain a first voltage reference digital signal, a second voltage reference digital signal, a first work selection digital signal and a second work selection digital signal;
the input end of the first digital-to-analog conversion module is connected with the first output end of the differential power unit control module, and the first digital-to-analog conversion module is used for carrying out digital-to-analog conversion on the first voltage reference digital signal so as to obtain the first voltage reference signal;
the input end of the second digital-to-analog conversion module is connected with the second output end of the differential power unit control module, and the second digital-to-analog conversion module is used for carrying out digital-to-analog conversion on the second voltage reference digital signal so as to obtain the second voltage reference signal;
The input end of the third digital-to-analog conversion module is connected with the third output end of the differential power unit control module, and the third digital-to-analog conversion module is used for carrying out digital-to-analog conversion on the first work selection digital signal so as to obtain the first work selection signal;
And the input end of the fourth digital-to-analog conversion module is connected with the fourth output end of the differential power unit control module, and the fourth digital-to-analog conversion module is used for carrying out digital-to-analog conversion on the second work selection digital signal so as to obtain the second work selection signal.
Optionally, the control circuit includes:
A first voltage regulator, a first input end of which is connected with the output end of the first digital-to-analog conversion module, a second input end of which is connected with the output end of the third voltage sensor, the first voltage regulator is used for carrying out voltage regulation on the signal obtained by subtracting the first voltage reference signal and the third voltage feedback signal so as to obtain a first high-frequency switch signal;
The first input end of the second voltage regulator is connected with the output end of the second digital-to-analog conversion module, the second input end of the second voltage regulator is connected with the output end of the fourth voltage sensor, and the second voltage regulator is used for carrying out voltage regulation on the signal obtained by subtracting the second voltage reference signal and the fourth voltage feedback signal so as to obtain a second high-frequency switch signal;
The first AND gate is used for generating the first switch logic signal according to the first high-frequency switch signal and the first work selection signal and transmitting the first switch logic signal to the control end of the first difference power unit;
and the first input end of the second AND gate is connected with the output end of the second voltage regulator, the second input end of the second AND gate is connected with the output end of the fourth digital-to-analog conversion module, and the second AND gate is used for generating a second switch logic signal according to the second high-frequency switch signal and the second work selection signal and transmitting the second switch logic signal to the control end of the second difference power unit.
Optionally, the first differential power unit and the second differential power unit are isolated converters.
Optionally, the dual-input inverter is a half-bridge inverter.
Optionally, the first diode and the second diode are silicon carbide diodes or fast recovery diodes.
Optionally, the first filter capacitor and the second filter capacitor are a polar capacitor or a non-polar capacitor.
In order to achieve the above object, a second aspect of the present invention provides a method for controlling a differential power unit in a dual-input inverter, including:
Acquiring input voltages of a first difference power unit and a second difference power unit in real time by adopting a sensor assembly, and comparing the input voltages with load/grid voltage peaks in a preset proportion;
If the input voltages of the first difference power unit and the second difference power unit are both larger than the load/grid voltage peak value, acquiring output power of the first photovoltaic cell module and the second photovoltaic cell module, and respectively controlling the first difference power unit and the second difference power unit according to the output power;
If the input voltages of the first difference power unit and the second difference power unit are smaller than the load/grid voltage peak value, directly starting the first difference power unit and the second difference power unit;
If the input voltage of any one of the first differential power unit and the second differential power unit is smaller than the load/grid voltage peak value, comparing the input voltage of the first differential power unit with the input voltage of the second differential power unit, and respectively controlling the first differential power unit and the second differential power unit according to the comparison result.
The invention has at least the following technical effects:
the invention is suitable for the occasion of the double-input inverter, can realize the maximum power output of the two photovoltaic cell modules, so as to solve the problem of insufficient voltage of the bus of the inverter under the shadow condition, can realize the balance of the positive half cycle power and the negative half cycle power of the double-input inverter, and can ensure the higher output voltage or current waveform quality.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a block diagram of a differential power unit control device in a dual-input inverter according to an embodiment of the present invention;
Fig. 2 is a schematic circuit diagram of a dual-input inverter according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a control driving unit according to an embodiment of the present invention;
FIG. 4 is a flowchart of a method for controlling a differential power unit in a dual-input inverter according to an embodiment of the present invention;
fig. 5 is a flowchart of a method for controlling a differential power unit in a dual input inverter according to an embodiment of the present invention.
Detailed Description
The present embodiment is described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The differential power unit control apparatus and control method in the dual input inverter of the present embodiment are described below with reference to the accompanying drawings.
Fig. 1 is a block diagram of a differential power unit control device in a dual-input inverter according to an embodiment of the invention. As shown in fig. 1, the differential power unit control apparatus 100 in the dual input inverter includes a control driving unit 10 and a dual input inverter circuit 20.
As shown in fig. 2, the dual input inverter circuit 20 includes a first photovoltaic cell module PV1, a second photovoltaic cell module PV2, a first filter capacitor Cin1, a second filter capacitor Cin2, a first diode D1, a second diode D2, a first differential power unit F1, a second differential power unit F2, a dual input inverter G, and a load/grid Z.
The differential power unit is an isolated converter such as a flyback converter, a forward converter, a push-pull converter and the like, the dual-input inverter G is a half-bridge inverter such as a traditional half-bridge inverter and a dual-buck half-bridge inverter and the like, and specifically can be a dual-grounded, dual-input and high-reliability photovoltaic inverter, the first diode D 1 and the second diode D 2 are silicon carbide diodes or fast recovery diodes, and the first filter capacitor C in1 and the second filter capacitor C in2 are polar capacitors or nonpolar capacitors. It should be noted that, the above devices are not particularly limited in this embodiment.
In one embodiment of the present invention, the specific circuit topology of the dual-input inverter circuit 20 is that the positive electrode of the first photovoltaic cell module PV1 is respectively connected to the input positive end of the second differential power unit F2, one end of the first filter capacitor Cin1, the anode of the first diode D1 and the output negative end of the first differential power unit F1, the negative electrode of the first photovoltaic cell module PV1 is respectively connected to the input positive end of the first differential power unit F1, the input negative end of the second differential power unit F2, the other end of the first filter capacitor Cin1, the positive electrode of the second photovoltaic cell module PV2, one end of the second filter capacitor Cin2 and the negative end of the load/power grid Z, the negative electrode of the second photovoltaic cell module PV2 is respectively connected to the input negative end of the first differential power unit F1, the other end of the second filter capacitor Cin2 and the cathode of the second diode D2, the cathode of the first diode D1 is respectively connected to the output positive end of the first differential power unit F1 and the output positive end of the dual-input inverter G2, and the negative end of the dual-input inverter G is respectively connected to the input end of the input of the dual-input inverter G2.
In this embodiment, the input end of the control driving unit 10 is connected to the output ends of the first photovoltaic cell module PV1, the second photovoltaic cell module PV2, the first differential power unit F1 and the second differential power unit F2 in the dual-input inverter circuit 20, the output end of the control driving unit 10 is connected to the control ends of the first differential power unit F1 and the second differential power unit F2, and the control driving unit 10 is configured to collect the voltage feedback signals and the current feedback signals of the first photovoltaic cell module PV1 and the second photovoltaic cell module PV2 and the voltage feedback signals output by the first differential power unit F1 and the second differential power unit F2, and generate the first switch logic signal and the second switch logic signal according to the voltage feedback signals and the current feedback signals, so as to drive and control the first differential power unit and the second differential power unit according to the first switch logic signal and the second switch logic signal.
Specifically, the input voltage of the dual-input inverter G may be selected by the first diode D1 and the second diode D2, when the differential power unit does not work, the diodes connected in series with the output side corresponding to the photovoltaic modules are turned on, and when the differential power unit works, the diodes connected in series with the output side corresponding to the photovoltaic modules bear the back-pressure and are turned off. Therefore, the device can realize the balance of the positive half cycle power and the negative half cycle power of the double-input inverter, and the differential power unit only bears half of the differential power of the two photovoltaic battery modules, so that the power is low, the cost is low, and the system conversion efficiency is improved.
Further, as shown in fig. 3, the control driving unit 10 includes a sensor assembly 1, a digital signal processor 2, and a control circuit 3.
The input end of the sensor assembly 1 is respectively connected with the output ends of the first photovoltaic cell module PV1, the second photovoltaic cell module PV2, the first differential power unit F1 and the second differential power unit F2, and the sensor assembly 1 is used for respectively acquiring a first voltage feedback signal U pv1, a second voltage feedback signal U pv2, a first current feedback signal i pv1 and a second current feedback signal i pv2 of the first photovoltaic cell module PV1 and the second photovoltaic cell module PV2, and is used for acquiring a third voltage feedback signal U C1 and a fourth voltage feedback signal U C2 of the output ends of the first differential power unit F1 and the second differential power unit F2;
The input end of the digital signal processor 2 is connected with the first output end of the sensor assembly 1, and is used for performing signal processing on the first voltage feedback signal U pv1, the second voltage feedback signal U pv2, the first current feedback signal i pv1 and the second current feedback signal i pv2 of the first photovoltaic cell module PV1 and the second photovoltaic cell module PV2, and generating a first voltage reference signal U ref1, a second voltage reference signal U ref2, a first operation selection signal U wc1 and a second operation selection signal U wc2;
The first input end of the control circuit 3 is connected with the output end of the digital signal processor 2, the second input end of the control circuit 3 is connected with the second output end of the sensor assembly 1, and the control circuit 3 is used for performing voltage comparison control according to the signals subtracted by the third voltage feedback signal u C1 and the fourth voltage feedback signal u C2 and generating a first switch logic signal O 1 and a second switch logic signal O 2 respectively according to the first voltage reference signal u ref1 and the second voltage reference signal u ref2.
With continued reference to fig. 3, in the present embodiment, the sensor assembly 1 includes a first voltage sensor 101, a second voltage sensor 102, a first current sensor 103, a second current sensor 104, a third voltage sensor 105, and a fourth voltage sensor 106.
The input end of the first voltage sensor 101 is connected with the first photovoltaic cell module PV1, the output end of the first voltage sensor 101 is connected with the input end of the digital signal processor 2, and the first voltage sensor 101 is used for acquiring a first voltage feedback signal U pv1 and transmitting the first voltage feedback signal U pv1 to the digital signal processor 2; the input end of the second voltage sensor 102 is connected with the second photovoltaic cell module PV2, the output end of the second voltage sensor 102 is connected with the input end of the digital signal processor 2, the second voltage sensor 102 is used for collecting the second voltage feedback signal U pv2 and transmitting the second voltage feedback signal U pv2 into the digital signal processor 2, the input end of the first current sensor 103 is connected with the first photovoltaic cell module PV1, the output end of the first current sensor 103 is connected with the input end of the digital signal processor 2, the first current sensor 103 is used for collecting the first current feedback signal i pv1 and transmitting the first current feedback signal I pv1 into the digital signal processor 2, the input end of the second current sensor 104 is connected with the second photovoltaic cell module PV2, the output end of the second current sensor 104 is connected with the input end of the digital signal processor 2, the input end of the second current sensor 104 is used for collecting the second current feedback signal i pv2 and transmitting the second current feedback signal I pv2 into the digital signal processor 2, the input end of the third voltage sensor 105 is connected with the output end of the first difference power unit F1, the output end of the third voltage sensor 105 is connected with the input end of the control circuit 3, the third voltage sensor 105 is used for collecting the third voltage feedback signal C1 and transmitting the first current feedback signal I pv1 into the control circuit 3, the fourth voltage sensor 106 is connected with the output end of the fourth voltage sensor 106 and the fourth voltage sensor 106 is connected with the output end of the fourth voltage sensor 3 and the fourth input end of the fourth voltage sensor 106 is used for collecting the fourth voltage signal 3.
With continued reference to fig. 3, the digital signal processor 2 includes a first analog-to-digital conversion module AD1, a second analog-to-digital conversion module AD2, a third analog-to-digital conversion module AD3, a fourth analog-to-digital conversion module AD4, a power calculation module 201, a differential power unit control module 202, a first digital-to-analog conversion module DA1, a second digital-to-analog conversion module DA2, a third digital-to-analog conversion module DA3, and a fourth digital-to-analog conversion module DA4.
The input end of the first analog-to-digital conversion module AD1 is connected to the output end of the first voltage sensor 101, and is used for performing analog-to-digital conversion on the first voltage feedback signal U pv1 to obtain a first digital signal, the input end of the second analog-to-digital conversion module AD2 is connected to the output end of the second voltage sensor 102, and is used for performing analog-to-digital conversion on the second voltage feedback signal U pv2 to obtain a second digital signal, the input end of the third analog-to-digital conversion module AD3 is connected to the output end of the first current sensor 103, and is used for performing analog-to-digital conversion on the first current feedback signal i pv1 to obtain a third digital signal, and the input end of the fourth analog-to-digital conversion module AD4 is connected to the output end of the second current sensor 104, and is used for performing analog-to-digital conversion on the second current feedback signal i pv2 to obtain a fourth digital signal.
In this embodiment, the input end of the power calculation module 201 is respectively connected to the second output end of the first analog-to-digital conversion module AD1, the second output end of the second analog-to-digital conversion module AD2, the output end of the third analog-to-digital conversion module AD3, and the output end of the fourth analog-to-digital conversion module AD4, and is used for performing power calculation on the first digital signal, the second digital signal, the third digital signal, and the fourth digital signal to obtain a fifth digital signal, and the input end of the differential power unit control module 202 is respectively connected to the first output end of the first analog-to-digital conversion module AD1, the first output end of the second analog-to-digital conversion module AD2, and the output end of the power calculation module 201, and performs digital processing on the first digital signal, the second digital signal, and the fifth digital signal to obtain a first voltage reference digital signal, a second voltage reference digital signal, a first operation selection digital signal, and a second operation selection digital signal.
In this embodiment, an input end of the first digital-to-analog conversion module DA1 is connected to a first output end of the differential power unit control module 202, and is configured to perform digital-to-analog conversion on a first voltage reference digital signal to obtain a first voltage reference signal u ref1, where the first voltage reference signal u ref1 satisfies the following formula (1) or formula (2) or formula (3):
uref1＝Uin2-Uin1 (2)
uref1＝mUom-Uin1 (3)
Wherein U ref1 is a first voltage reference signal, p 1 is an output power of the first photovoltaic cell module PV1, p 2 is an output power of the second photovoltaic cell module PV2, U in1 is an input voltage of the first differential power unit F1, U in2 is an input voltage of the second differential power unit F2, m is a preset ratio, and U om is a load/grid voltage peak.
Similarly, an input end of the second digital-to-analog conversion module DA2 is connected to the second output end of the differential power unit control module 202, and is configured to perform digital-to-analog conversion on the second voltage reference digital signal to obtain a second voltage reference signal u ref2, where the second voltage reference signal u ref2 satisfies the following formula (4) or formula (5) or formula (6):
uref2＝Uin1-Uin2 (5)
uref2＝mUom-Uin2 (6)
In this embodiment, an input end of the third digital-to-analog conversion module DA3 is connected to a third output end of the differential power unit control module 202, and is used for performing digital-to-analog conversion on the first work selection digital signal to obtain a first work selection signal u wc1, and an input end of the fourth digital-to-analog conversion module DA4 is connected to a fourth output end of the differential power unit control module 202, and is used for performing digital-to-analog conversion on the second work selection digital signal to obtain a second work selection signal u wc2.
With continued reference to fig. 3, the control circuit 3 includes a first voltage regulator 301, a second voltage regulator 302, a first and gate 303, and a second and gate 304.
The first voltage regulator 301 is connected with an output end of the first digital-to-analog conversion module DA1, a second input end thereof is connected with an output end of the third voltage sensor 105, the first voltage regulator 301 is used for voltage regulating a signal obtained by subtracting the first voltage reference signal u ref1 and the third voltage feedback signal u C1 to obtain a first high-frequency switching signal, a first input end of the second voltage regulator 302 is connected with an output end of the second digital-to-analog conversion module DA2, a second input end thereof is connected with an output end of the fourth voltage sensor 106, the second voltage regulator 302 is used for voltage regulating a signal obtained by subtracting the second voltage reference signal u ref2 and the fourth voltage feedback signal u C2 to obtain a second high-frequency switching signal, a first input end of the first and gate 303 is connected with an output end of the first voltage regulator 301, a second input end thereof is connected with an output end of the third voltage regulator module u C1, the first and gate 303 can obtain a second switching signal according to the first high-frequency switching signal u wc1 and the first working selection signal u 2, a second input end thereof is connected with the second switching logic unit DA 29 and the second switching logic signal F2, and the second switching logic signal is connected with the second input end of the second and the second gate logic unit DA2 to obtain a second switching logic signal F2, and the second switching logic signal is connected with the second input end of the second logic gate unit F2 and the second switching logic signal is connected with the second logic gate unit input end of the second logic gate unit input end thereof to the second logic gate unit input end thereof.
In this example, both the first voltage regulator 301 and the second voltage regulator 302 are PI (Proportional Integral ) controlled.
Fig. 4 is a flowchart of a method for controlling a differential power unit in a dual-input inverter according to an embodiment of the invention. As shown in fig. 4, the control method includes:
step S1, acquiring input voltages of a first difference power unit and a second difference power unit in real time by adopting a sensor assembly, and comparing the input voltages with load/grid voltage peaks in a preset proportion;
Step S2, if the input voltages of the first difference power unit and the second difference power unit are both larger than the load/grid voltage peak value, acquiring the output power of the first photovoltaic cell module and the second photovoltaic cell module, and respectively controlling the first difference power unit and the second difference power unit according to the output power;
Step S3, if the input voltages of the first difference power unit and the second difference power unit are smaller than the load/grid voltage peak value, directly starting the first difference power unit and the second difference power unit;
And S4, if the input voltage of any one of the first difference power unit and the second difference power unit is smaller than the load/grid voltage peak value, comparing the input voltage of the first difference power unit with the input voltage of the second difference power unit, and respectively controlling the first difference power unit and the second difference power unit according to the comparison result.
As a specific example, as shown in fig. 5, the control method may specifically include:
The method comprises the steps of 1, acquiring input voltages U in1 and U in2 of a first difference power unit F1 and a second difference power unit F2 in real time by adopting a sensor assembly, and carrying out first judgment on input voltages U in1 and U in2 of the first difference power unit F1 and the second difference power unit F2 and a load/power grid voltage peak value mU om with preset proportion, wherein the judgment on that both U in1 and U in2 are larger than, smaller than or only one voltage is smaller than mU om;
Step 2, the sensor assembly collects output voltages U pv1 and U pv2 and output currents i pv1 and i pv2 of the first photovoltaic cell module PV1 and the second photovoltaic cell module PV2 in real time, and output power p 1 and p 2 of the first photovoltaic cell module PV1 and the second photovoltaic cell module PV2 are calculated in the digital signal processor 2 respectively;
Step 3, when the input voltages U in1 and U in2 of the first differential power unit F1 and the second differential power unit F2 are both larger than the load/grid voltage peak value mU om with preset proportion, taking an absolute value |p 1-p2 | of the difference value of the output power of the first photovoltaic cell module PV1 and the second photovoltaic cell module PV2, and carrying out second judgment on the absolute value |p 1-p2 | and the load/grid rated power nP o with preset proportion, and if |p 1-p2 | is smaller than nP o, neither the first differential power unit, namely the differential power unit 1 nor the second differential power unit, namely the differential power unit 2 is started;
Step 4, if |p 1-p2 | is larger than nP o, the output power of the first photovoltaic cell module PV1 and the output power of the second photovoltaic cell module PV2 are judged for the third time, if the output power p 1 of the first photovoltaic cell module PV1 is larger than the output power p 2 of the second photovoltaic cell module PV2, a second voltage reference signal U ref2 is calculated, the second voltage reference signal U ref2 is overlapped with the input voltage U in2 of the second differential power unit F2, and then when the overlapped value is smaller than the load/grid voltage peak value kU om of another preset proportion, only the differential power unit 2 is started;
Step 5, if the output power p 1 of the first photovoltaic cell module PV1 is smaller than the output power p 2 of the second photovoltaic cell module PV2, calculating a first voltage reference signal u ref1, and starting only the differential power unit 1;
step 6, when the input voltages U in1 and U in2 of the first differential power unit F1 and the second differential power unit F2 are smaller than the load/grid voltage peak value mU om with preset proportion, calculating a first voltage reference signal U ref1 and a second voltage reference signal U ref2, and directly starting the differential power unit 1 and the differential power unit 2;
Step 7, when only one of the input voltages U in1 and U in2 of the first differential power unit F1 and the second differential power unit F2 is smaller than the load/grid voltage peak value mU om of the preset ratio, determining the magnitudes of the input voltages U in1 and U in2 for the fourth time, if the input voltage U in1 is larger than the input voltage U in2, calculating a second voltage reference signal U ref2, and starting only the differential power unit 2;
In step 8, if the input voltage U in1 is smaller than the input voltage U in2, the first voltage reference signal U ref1 is calculated and only the differential power unit 1 is started.
Specifically, the invention needs to collect the input voltage of the two differential power units, the output voltage and power of the photovoltaic cell module in real time, set the voltage coefficient as m and set the power coefficient as n. When the input voltages of the two difference power units are detected to be larger than the m times of the output rated voltage peak value, the reference voltage of each difference power unit can be calculated and determined, and the difference power units 2 are started to realize the maximum power output of the two photovoltaic battery modules, the balance of the positive and negative half-cycle powers of the double-input inverter and the high output voltage or current waveform quality, when the input voltages of the two difference power units are detected to be larger than the m times of the output rated voltage peak value, the absolute value of the output power difference of the two photovoltaic modules is compared to be larger than n times of the output rated power, if the absolute value of the output power difference of the two difference power units is larger than the n times of the output rated power, the reference voltage of the two difference power units is calculated and determined, and the difference power units 1 or 2 are started to realize the maximum power output of the two photovoltaic battery modules, the balance of the positive and negative half-cycle powers of the double-input inverter and the high output voltage or current waveform quality, and if the output power difference of the two photovoltaic modules is smaller than the n times of the output rated power, the difference power units do not work, so that the difference power units are prevented from running due to the difference power loss caused by light load of the difference power units, and when the detected input voltage of the two difference power units is smaller than the m times of the output voltage, the output power unit is smaller than the voltage, the difference power unit is calculated, and the difference power is calculated, and the power loss is lower, and the power is calculated, and the loss is lower, due to the difference that the difference power unit is calculated, and the power and has the power loss is lower.
In this embodiment, the voltage coefficient, i.e., the preset ratio m, is generally 1.05-1.1, and the power coefficient, i.e., the preset ratio n, is generally 0.05-0.1.
It should be noted that, in the embodiment, the sum of the input voltage of the differential power unit and the reference voltage generated by another differential power unit does not exceed kU om, where the voltage coefficient k, i.e. the other preset ratio value, generally takes a value of 1.2.
In summary, the invention is suitable for the occasion of the double-input inverter, can realize the maximum power output of the two photovoltaic cell modules, so as to solve the problem of insufficient voltage of the bus of the inverter under the shadow condition, can realize the balance of the positive half cycle power and the negative half cycle power of the double-input inverter, and can ensure the higher output voltage or current waveform quality.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
While the present invention has been described in detail through the foregoing description of the preferred embodiment, it should be understood that the foregoing description is not to be considered as limiting the invention. Many modifications and substitutions of the present invention will become apparent to those of ordinary skill in the art upon reading the foregoing. Accordingly, the scope of the invention should be limited only by the attached claims.

Claims (10)

1.一种双输入逆变器中差值功率单元控制装置，其特征在于，包括：1. A control device for a differential power unit in a dual-input inverter, comprising: 双输入逆变器电路，所述双输入逆变器电路包括第一光伏电池模块、第二光伏电池模块、第一滤波电容、第二滤波电容、第一二极管、第二二极管、第一差值功率单元、第二差值功率单元、双输入逆变器和负载/电网，其中，第一光伏电池模块的正极分别连接第二差值功率单元的输入正端、第一滤波电容的一端、第一二极管的阳极和第一差值功率单元的输出负端；第一光伏电池模块的负极分别连接第一差值功率单元的输入正端、第二差值功率单元的输入负端、第一滤波电容的另一端、第二光伏电池模块的正极、第二滤波电容的一端和负载/电网的负端；第二光伏电池模块的负极分别连接第一差值功率单元的输入负端、第二差值功率单元的输出正端、第二滤波电容的另一端和第二二极管的阴极；第一二极管的阴极分别连接第一差值功率单元的输出正端和双输入逆变器的输入正端；第二二极管的阳极分别连接第二差值功率单元的输出负端和双输入逆变器的输入负端，所述双输入逆变器的输出正端连接到负载/电网的正端；A dual-input inverter circuit, the dual-input inverter circuit comprising a first photovoltaic cell module, a second photovoltaic cell module, a first filter capacitor, a second filter capacitor, a first diode, a second diode, a first difference power unit, a second difference power unit, a dual-input inverter and a load/grid, wherein the positive electrode of the first photovoltaic cell module is respectively connected to the input positive end of the second difference power unit, one end of the first filter capacitor, the anode of the first diode and the output negative end of the first difference power unit; the negative electrode of the first photovoltaic cell module is respectively connected to the input positive end of the first difference power unit, the input negative end of the second difference power unit, the anode of the first diode and the output negative end of the first difference power unit. The other end of a filter capacitor, the positive electrode of a second photovoltaic cell module, one end of the second filter capacitor and the negative end of a load/grid; the negative electrode of the second photovoltaic cell module is respectively connected to the input negative end of the first difference power unit, the output positive end of the second difference power unit, the other end of the second filter capacitor and the cathode of the second diode; the cathode of the first diode is respectively connected to the output positive end of the first difference power unit and the input positive end of the dual-input inverter; the anode of the second diode is respectively connected to the output negative end of the second difference power unit and the input negative end of the dual-input inverter, and the output positive end of the dual-input inverter is connected to the positive end of the load/grid; 控制驱动单元，其输入端分别与所述双输入逆变器电路中的第一光伏电池模块、第二光伏电池模块、第一差值功率单元、第二差值功率单元的输出端连接，所述控制驱动单元的输出端分别与所述第一差值功率单元和所述第二差值功率单元的控制端连接，所述控制驱动单元用于采集第一光伏电池模块和第二光伏电池模块的电压反馈信号和电流反馈信号以及第一差值功率单元和第二差值功率单元输出的电压反馈信号，并根据所述电压反馈信号和所述电流反馈信号生成第一开关逻辑信号和第二开关逻辑信号，以根据所述第一开关逻辑信号和所述第二开关逻辑信号分别对所述第一差值功率单元和所述第二差值功率单元进行驱动控制。A control drive unit, whose input end is respectively connected to the output ends of the first photovoltaic cell module, the second photovoltaic cell module, the first difference power unit, and the second difference power unit in the dual-input inverter circuit, and the output end of the control drive unit is respectively connected to the control ends of the first difference power unit and the second difference power unit, and the control drive unit is used to collect the voltage feedback signal and the current feedback signal of the first photovoltaic cell module and the second photovoltaic cell module and the voltage feedback signal output by the first difference power unit and the second difference power unit, and generate a first switch logic signal and a second switch logic signal according to the voltage feedback signal and the current feedback signal, so as to drive and control the first difference power unit and the second difference power unit respectively according to the first switch logic signal and the second switch logic signal. 2.如权利要求1所述的双输入逆变器中差值功率单元控制装置，其特征在于，所述控制驱动单元包括：2. The control device for a differential power unit in a dual-input inverter according to claim 1, wherein the control drive unit comprises: 传感器组件，其输入端分别与第一光伏电池模块、第二光伏电池模块、第一差值功率单元和第二差值功率单元的输出端连接，所述传感器组件用于分别采集所述第一光伏电池模块和所述第二光伏电池模块的第一电压反馈信号、第二电压反馈信号、第一电流反馈信号和第二电流反馈信号，以及所述第一差值功率单元和第二差值功率单元分别输出的第三电压反馈信号和第四电压反馈信号；A sensor component, whose input end is respectively connected to the output ends of the first photovoltaic cell module, the second photovoltaic cell module, the first difference power unit and the second difference power unit, and the sensor component is used to respectively collect the first voltage feedback signal, the second voltage feedback signal, the first current feedback signal and the second current feedback signal of the first photovoltaic cell module and the second photovoltaic cell module, and the third voltage feedback signal and the fourth voltage feedback signal respectively output by the first difference power unit and the second difference power unit; 数字信号处理器，其输入端与所述传感器组件的第一输出端连接，所述数字信号处理器用于对所述第一电压反馈信号、所述第二电压反馈信号、所述第一电流反馈信号和所述第二电流反馈信号进行信号处理，并生成第一电压参考信号、第二电压参考信号、第一工作选择信号和第二工作选择信号；a digital signal processor, whose input end is connected to the first output end of the sensor assembly, and the digital signal processor is used to perform signal processing on the first voltage feedback signal, the second voltage feedback signal, the first current feedback signal, and the second current feedback signal, and generate a first voltage reference signal, a second voltage reference signal, a first working selection signal, and a second working selection signal; 控制电路，其第一输入端与所述数字信号处理器的输出端连接，所述控制电路的第二输入端与所述传感器组件的第二输出端连接，所述控制电路用于根据所述第一电压参考信号和所述第三电压反馈信号相减后的信号生成所述第一开关逻辑信号，并根据所述第二电压参考信号和所述第四电压反馈信号相减后的信号生成所述第二开关逻辑信号。A control circuit, wherein a first input terminal is connected to an output terminal of the digital signal processor, and a second input terminal of the control circuit is connected to a second output terminal of the sensor assembly, wherein the control circuit is used to generate the first switch logic signal according to a signal obtained by subtracting the first voltage reference signal from the third voltage feedback signal, and to generate the second switch logic signal according to a signal obtained by subtracting the second voltage reference signal from the fourth voltage feedback signal. 3.如权利要求2所述的双输入逆变器中差值功率单元控制装置，其特征在于，所述传感器组件包括：3. The control device for a differential power unit in a dual-input inverter according to claim 2, wherein the sensor component comprises: 第一电压传感器，其输入端与所述第一光伏电池模块连接，所述第一电压传感器的输出端与所述数字信号处理器的输入端连接，所述第一电压传感器用于采集所述第一电压反馈信号并传输至所述数字信号处理器中；a first voltage sensor, whose input end is connected to the first photovoltaic cell module, whose output end is connected to the input end of the digital signal processor, and the first voltage sensor is used to collect the first voltage feedback signal and transmit it to the digital signal processor; 第二电压传感器，其输入端与所述第二光伏电池模块连接，所述第二电压传感器的输出端与所述数字信号处理器的输入端连接，所述第二电压传感器用于采集所述第二电压反馈信号并传输至所述数字信号处理器中；a second voltage sensor, whose input end is connected to the second photovoltaic cell module, whose output end is connected to the input end of the digital signal processor, and the second voltage sensor is used to collect the second voltage feedback signal and transmit it to the digital signal processor; 第一电流传感器，其输入端与所述第一光伏电池模块连接，所述第一电流传感器的输出端与所述数字信号处理器的输入端连接，所述第一电流传感器用于采集所述第一电流反馈信号并传输至所述数字信号处理器中；a first current sensor, whose input end is connected to the first photovoltaic cell module, whose output end is connected to the input end of the digital signal processor, and the first current sensor is used to collect the first current feedback signal and transmit it to the digital signal processor; 第二电流传感器，其输入端与所述第二光伏电池模块连接，所述第二电流传感器的输出端与所述数字信号处理器的输入端连接，所述第二电流传感器用于采集所述第二电流反馈信号并传输至所述数字信号处理器中；a second current sensor, whose input end is connected to the second photovoltaic cell module, whose output end is connected to the input end of the digital signal processor, and the second current sensor is used to collect the second current feedback signal and transmit it to the digital signal processor; 第三电压传感器，其输入端与所述第一差值功率单元的输出端连接，所述第三电压传感器的输出端与所述控制电路的输入端连接，所述第三电压传感器用于采集所述第三电压反馈信号并传输至所述控制电路中；a third voltage sensor, whose input end is connected to the output end of the first difference power unit, whose output end is connected to the input end of the control circuit, and whose third voltage sensor is used to collect the third voltage feedback signal and transmit it to the control circuit; 第四电压传感器，其输入端与所述第二差值功率单元的输出端连接，所述第四电压传感器的输出端与所述控制电路的输入端连接，所述第四电压传感器用于采集所述第四电压反馈信号并传输至所述控制电路中。A fourth voltage sensor, whose input end is connected to the output end of the second difference power unit, the output end of the fourth voltage sensor is connected to the input end of the control circuit, and the fourth voltage sensor is used to collect the fourth voltage feedback signal and transmit it to the control circuit. 4.如权利要求3所述的双输入逆变器中差值功率单元控制装置，其特征在于，所述数字信号处理器包括：4. The control device for a differential power unit in a dual-input inverter according to claim 3, wherein the digital signal processor comprises: 第一模数转换模块，其输入端与所述第一电压传感器的输出端连接，所述第一模数转换模块用于对所述第一电压反馈信号进行模数转换，以获得第一数字信号；A first analog-to-digital conversion module, whose input end is connected to the output end of the first voltage sensor, and the first analog-to-digital conversion module is used to perform analog-to-digital conversion on the first voltage feedback signal to obtain a first digital signal; 第二模数转换模块，其输入端与所述第二电压传感器的输出端连接，所述第二模数转换模块用于对所述第二电压反馈信号进行模数转换，以获得第二数字信号；A second analog-to-digital conversion module, whose input end is connected to the output end of the second voltage sensor, and the second analog-to-digital conversion module is used to perform analog-to-digital conversion on the second voltage feedback signal to obtain a second digital signal; 第三模数转换模块，其输入端与所述第一电流传感器的输出端连接，所述第三模数转换模块用于对所述第一电流反馈信号进行模数转换，以获得第三数字信号；A third analog-to-digital conversion module, whose input end is connected to the output end of the first current sensor, and the third analog-to-digital conversion module is used to perform analog-to-digital conversion on the first current feedback signal to obtain a third digital signal; 第四模数转换模块，其输入端与所述第二电流传感器的输出端连接，所述第四模数转换模块用于对所述第二电流反馈信号进行模数转换，以获得第四数字信号；a fourth analog-to-digital conversion module, whose input end is connected to the output end of the second current sensor, and the fourth analog-to-digital conversion module is used to perform analog-to-digital conversion on the second current feedback signal to obtain a fourth digital signal; 功率计算模块，其输入端分别与所述第一模数转换模块的第二输出端、所述第二模数转换模块的第二输出端、所述第三模数转换模块的输出端和所述第四模数转换模块的输出端连接，所述功率计算模块用于对所述第一数字信号、所述第二数字信号、所述第三数字信号和所述第四数字信号进行功率计算，以获得第五数字信号；a power calculation module, whose input end is respectively connected to the second output end of the first analog-to-digital conversion module, the second output end of the second analog-to-digital conversion module, the output end of the third analog-to-digital conversion module, and the output end of the fourth analog-to-digital conversion module, and the power calculation module is used to perform power calculation on the first digital signal, the second digital signal, the third digital signal, and the fourth digital signal to obtain a fifth digital signal; 差值功率单元控制模块，其输入端分别与所述第一模数转换模块的第一输出端、所述第二模数转换模块的第一输出端和所述功率计算模块的输出端连接，所述差值功率单元控制模块用于对所述第一数字信号、所述第二数字信号和所述第五数字信号进行数字处理，以获得第一电压参考数字信号、第二电压参考数字信号、第一工作选择数字信号和第二工作选择数字信号；a difference power unit control module, whose input end is respectively connected to the first output end of the first analog-to-digital conversion module, the first output end of the second analog-to-digital conversion module and the output end of the power calculation module, and the difference power unit control module is used to digitally process the first digital signal, the second digital signal and the fifth digital signal to obtain a first voltage reference digital signal, a second voltage reference digital signal, a first working selection digital signal and a second working selection digital signal; 第一数模转换模块，其输入端与所述差值功率单元控制模块的第一输出端连接，所述第一数模转换模块用于对所述第一电压参考数字信号进行数模转换，以获得所述第一电压参考信号；A first digital-to-analog conversion module, whose input end is connected to the first output end of the difference power unit control module, and the first digital-to-analog conversion module is used to perform digital-to-analog conversion on the first voltage reference digital signal to obtain the first voltage reference signal; 第二数模转换模块，其输入端与所述差值功率单元控制模块的第二输出端连接，所述第二数模转换模块用于对所述第二电压参考数字信号进行数模转换，以获得所述第二电压参考信号；A second digital-to-analog conversion module, whose input end is connected to the second output end of the difference power unit control module, and the second digital-to-analog conversion module is used to perform digital-to-analog conversion on the second voltage reference digital signal to obtain the second voltage reference signal; 第三数模转换模块，其输入端与所述差值功率单元控制模块的第三输出端连接，所述第三数模转换模块用于对所述第一工作选择数字信号进行数模转换，以获得所述第一工作选择信号；a third digital-to-analog conversion module, whose input end is connected to the third output end of the difference power unit control module, and the third digital-to-analog conversion module is used to perform digital-to-analog conversion on the first work selection digital signal to obtain the first work selection signal; 第四数模转换模块，其输入端与所述差值功率单元控制模块的第四输出端连接，所述第四数模转换模块用于对所述第二工作选择数字信号进行数模转换，以获得所述第二工作选择信号。A fourth digital-to-analog conversion module, whose input end is connected to the fourth output end of the difference power unit control module, and the fourth digital-to-analog conversion module is used to perform digital-to-analog conversion on the second working selection digital signal to obtain the second working selection signal. 5.如权利要求4所述的双输入逆变器中差值功率单元控制装置，其特征在于，所述控制电路包括：5. The control device for a differential power unit in a dual-input inverter according to claim 4, wherein the control circuit comprises: 第一电压调节器，其第一输入端与所述第一数模转换模块的输出端连接，所述第一电压调节器的第二输入端与所述第三电压传感器的输出端连接，所述第一电压调节器用于对所述第一电压参考信号和所述第三电压反馈信号相减后的信号进行电压调节，以获得第一高频开关信号；a first voltage regulator, wherein a first input end of the first voltage regulator is connected to an output end of the first digital-to-analog conversion module, a second input end of the first voltage regulator is connected to an output end of the third voltage sensor, and the first voltage regulator is used to perform voltage regulation on a signal obtained by subtracting the first voltage reference signal from the third voltage feedback signal to obtain a first high-frequency switching signal; 第二电压调节器，其第一输入端与所述第二数模转换模块的输出端连接，所述第二电压调节器的第二输入端与所述第四电压传感器的输出端连接，所述第二电压调节器用于对所述第二电压参考信号和所述第四电压反馈信号相减后的信号进行电压调节，以获得第二高频开关信号；a second voltage regulator, wherein a first input end of the second voltage regulator is connected to an output end of the second digital-to-analog conversion module, a second input end of the second voltage regulator is connected to an output end of the fourth voltage sensor, and the second voltage regulator is used to perform voltage regulation on a signal obtained by subtracting the second voltage reference signal from the fourth voltage feedback signal to obtain a second high-frequency switching signal; 第一与门，其第一输入端与所述第一电压调节器的输出端连接，所述第一与门的第二输入端与所述第三数模转换模块的输出端连接，所述第一与门用于根据所述第一高频开关信号和所述第一工作选择信号生成所述第一开关逻辑信号，并传输至所述第一差值功率单元的控制端；a first AND gate, wherein a first input end of the first AND gate is connected to an output end of the first voltage regulator, a second input end of the first AND gate is connected to an output end of the third digital-to-analog conversion module, and the first AND gate is used to generate the first switch logic signal according to the first high-frequency switch signal and the first work selection signal, and transmit the signal to a control end of the first difference power unit; 第二与门，其第一输入端与所述第二电压调节器的输出端连接，所述第二与门的第二输入端与所述第四数模转换模块的输出端连接，所述第二与门用于根据所述第二高频开关信号和所述第二工作选择信号生成第二开关逻辑信号，并传输至所述第二差值功率单元的控制端。A second AND gate, wherein a first input end thereof is connected to the output end of the second voltage regulator, a second input end of the second AND gate is connected to the output end of the fourth digital-to-analog conversion module, and the second AND gate is used to generate a second switching logic signal according to the second high-frequency switching signal and the second working selection signal, and transmit the second switching logic signal to the control end of the second difference power unit. 6.如权利要求1所述的双输入逆变器中差值功率单元控制装置，其特征在于，所述第一差值功率单元和所述第二差值功率单元为隔离型变换器。6 . The control device for a differential power unit in a dual-input inverter according to claim 1 , wherein the first differential power unit and the second differential power unit are isolated converters. 7.如权利要求1所述的双输入逆变器中差值功率单元控制装置，其特征在于，所述双输入逆变器为半桥型逆变器。7 . The control device for a differential power unit in a dual-input inverter according to claim 1 , wherein the dual-input inverter is a half-bridge inverter. 8.如权利要求1所述的双输入逆变器中差值功率单元控制装置，其特征在于，所述第一二极管和所述第二二极管为碳化硅二极管或快恢复二极管。8 . The control device for a differential power unit in a dual-input inverter according to claim 1 , wherein the first diode and the second diode are silicon carbide diodes or fast recovery diodes. 9.如权利要求1所述的双输入逆变器中差值功率单元控制装置，其特征在于，所述第一滤波电容和所述第二滤波电容为有极性电容或无极性电容。9 . The control device for a differential power unit in a dual-input inverter according to claim 1 , wherein the first filter capacitor and the second filter capacitor are polar capacitors or non-polar capacitors. 10.基于权利要求1-9任一项所述的双输入逆变器中差值功率单元控制装置的控制方法，其特征在于，包括：10. A control method for a differential power unit control device in a dual-input inverter according to any one of claims 1 to 9, characterized in that it comprises: 采用传感器组件实时采集第一差值功率单元和第二差值功率单元的输入电压，并将所述输入电压与预设比例的负载/电网电压峰值进行比较；Using a sensor component to collect input voltages of the first difference power unit and the second difference power unit in real time, and comparing the input voltages with a load/grid voltage peak value of a preset ratio; 若所述第一差值功率单元和所述第二差值功率单元的输入电压均大于负载/电网电压峰值，则获取第一光伏电池模块和第二光伏电池模块的输出功率，并根据所述输出功率分别对所述第一差值功率单元和所述第二差值功率单元进行相应控制；If the input voltages of the first difference power unit and the second difference power unit are both greater than the load/grid voltage peak, the output powers of the first photovoltaic cell module and the second photovoltaic cell module are obtained, and the first difference power unit and the second difference power unit are controlled accordingly according to the output powers; 若所述第一差值功率单元和所述第二差值功率单元的输入电压均小于负载/电网电压峰值，则直接启动所述第一差值功率单元和所述第二差值功率单元；If the input voltages of the first difference power unit and the second difference power unit are both less than the load/grid voltage peak, directly starting the first difference power unit and the second difference power unit; 若所述第一差值功率单元和所述第二差值功率单元中任意一个差值功率单元的输入电压小于负载/电网电压峰值，则比较所述第一差值功率单元的输入电压和所述第二差值功率单元的输入电压，并根据比较结果分别对所述第一差值功率单元和所述第二差值功率单元进行相应控制。If the input voltage of any one of the first differential power unit and the second differential power unit is less than the load/grid voltage peak, the input voltage of the first differential power unit and the input voltage of the second differential power unit are compared, and the first differential power unit and the second differential power unit are controlled accordingly according to the comparison result.
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