CN117559504B - Energy storage conversion circuit and working method thereof - Google Patents
Energy storage conversion circuit and working method thereof Download PDFInfo
- Publication number
- CN117559504B CN117559504B CN202311594040.9A CN202311594040A CN117559504B CN 117559504 B CN117559504 B CN 117559504B CN 202311594040 A CN202311594040 A CN 202311594040A CN 117559504 B CN117559504 B CN 117559504B
- Authority
- CN
- China
- Prior art keywords
- switching
- output current
- switch
- module
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 118
- 238000004146 energy storage Methods 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000000295 complement effect Effects 0.000 claims description 14
- 239000003990 capacitor Substances 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 8
- 238000001914 filtration Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
Classifications
-
- 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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
-
- 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
- H02M7/66—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal
- H02M7/68—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters
- H02M7/72—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
一种储能变换电路及其工作方法，包括：三个相变换电路，各变换电路还包括第一开关模块和第二开关模块，第一开关模块用于根据第一开关频率输出第一输出电流，第二开关模块用于根据第二开关频率输出第二输出电流，第一开关频率小于第二开关频率，变换电路的输出端用于输出第三输出电流，第三输出电流为第一输出电流和第二输出电流之和。通过不同开关频率控制所述第一开关模块和第二开关模块，使得在低频的开关频率下所述第一开关模块的功耗降低，同时保证了在高频的开关频率下所述第二开关模块的动态性能，进而提高了所述储能变换电路的性能。
An energy storage conversion circuit and a working method thereof include: three phase conversion circuits, each conversion circuit also includes a first switch module and a second switch module, the first switch module is used to output a first output current according to a first switching frequency, the second switch module is used to output a second output current according to a second switching frequency, the first switching frequency is less than the second switching frequency, and the output end of the conversion circuit is used to output a third output current, which is the sum of the first output current and the second output current. By controlling the first switch module and the second switch module at different switching frequencies, the power consumption of the first switch module is reduced at a low switching frequency, while the dynamic performance of the second switch module at a high switching frequency is guaranteed, thereby improving the performance of the energy storage conversion circuit.
Description
Technical Field
The invention relates to the technical field of electric automation equipment, in particular to an energy storage conversion circuit and a working method thereof.
Background
The converter is used as an interface between a distributed power generation system, an energy storage system and the like and a power grid, and plays a key role in mutual conversion of energy in different forms. The working efficiency and the dynamic performance are main attention indexes. The traditional energy storage converter is generally of a single-stage type and a bipolar type, the single-stage energy storage converter only needs to be subjected to primary electric quantity conversion, the circuit is simple, the loss is relatively small, and the single-stage energy storage converter is the first choice of a high-power concentrated new energy power station converter. For the design of the high-power converter, the following three main considerations are that the efficiency is to be improved, namely, the switching frequency of the power tube is reduced, namely, the loss of the power tube is reduced, on the other hand, a very heavy radiator is needed for assisting in heat dissipation, the loss of the power tube is also required to be reduced, and finally, the switching frequency of the power tube is required to be improved to improve the control bandwidth of the device to improve the dynamic performance of the device.
Currently, for centralized high power converters, a compromise choice of switching frequency is used. If the switching frequency is too low, grid connection performance is insufficient, such as grid connection stability and robustness are low, a weak electric network is easy to resonate, such as grid connection current harmonic content is large, grid connection harmonic requirements cannot be met, such as the dynamic performance of the device is too low, indexes such as fault ride-through and power fast switching cannot be met, and the performance of an energy storage conversion circuit is reduced.
Therefore, the existing energy storage conversion circuit still has a plurality of problems.
Disclosure of Invention
The invention solves the technical problem of providing the energy storage conversion circuit and the working method thereof, and improves the performance of the energy storage conversion circuit while reducing the power consumption of the energy storage conversion circuit.
In order to solve the technical problems, the embodiment of the invention provides an energy storage conversion circuit, which comprises three phase conversion circuits, wherein each phase conversion circuit comprises a first input end, a second input end and an output end, the first input ends of the phase conversion circuits are connected, the second input ends of the phase conversion circuits are connected, each conversion circuit further comprises a first switch module and a second switch module, the first switch module is used for outputting a first output current according to a first switch frequency, the second switch module is used for outputting a second output current according to a second switch frequency, the first switch frequency is smaller than the second switch frequency, the output ends of the conversion circuits are used for outputting a third output current, the third output current is the sum of the first output current and the second output current, the direct current input port is connected with the first input ends and the second input ends of the phase conversion circuits, and the alternating current output port is connected with the output ends of the phase conversion circuits.
Optionally, the first switch module includes first switch unit and second switch unit, first switch unit and second switch unit all include first end, second end and control end, the first end of first switch unit with direct current input port is connected, the second end of first switch unit respectively with the first end of second switch unit and second switch module are connected, the second end of second switch unit with direct current input port is connected, first switch unit with second switch unit is used for switching on or off according to first switching frequency, first switch unit with the conduction time of second switch unit is complementary.
Optionally, the first switch unit includes a plurality of first switch tubes connected in parallel, the second switch unit includes a plurality of second switch tubes connected in parallel, and the number of the first switch tubes is the same as the number of the second switch tubes.
Optionally, the first switch module further includes a first inductor, a first end of the first inductor is connected to an output end of the first switch module, and a second end of the first inductor is connected to an output end of the second switch module.
Optionally, the second switch module includes a third switch unit and a fourth switch unit, where the third switch unit and the fourth switch unit each include a first end, a second end and a control end, the first end of the third switch unit is connected with the first end of the first switch unit, the second end of the third switch unit is connected with the first end of the fourth switch unit and the ac output port, the second end of the fourth switch unit is connected with the second end of the second switch unit, and the third switch unit and the fourth switch unit are used for being turned on or turned off according to the second switch frequency, and the turn-on time of the third switch unit and the turn-on time of the fourth switch unit are complementary.
Optionally, the third switching unit includes a third switching tube, and the fourth switching unit includes a fourth switching tube.
Optionally, the direct current input port includes a positive bus voltage end, a negative bus voltage end and a first capacitor, and the first capacitor is connected between the positive bus voltage end and the negative bus voltage end.
Optionally, the ac output port includes three filtering modules connected in parallel, and each filtering module is connected to an output end of one of the phase conversion circuits.
Optionally, each of the three filtering modules includes a second inductor and a second capacitor connected in parallel.
Optionally, the energy storage conversion circuit further comprises a control module, wherein the control module is used for applying a first switching frequency to the first switching module to enable a first output current of an output end of the conversion circuit to reach a first preset threshold value, and applying a second switching frequency to the second switching module to enable a third output current of the output end of the conversion circuit to reach a second preset threshold value.
Optionally, the control module is further configured to adjust a duty cycle of the first switch module according to the first output current and the first preset threshold, and adjust a duty cycle of the second switch module according to the third output current and the second preset threshold.
Optionally, the control module is further configured to apply a first level to the first switching unit to turn on the first switching unit when the first output current is less than a first preset threshold, and apply a second level to the third switching unit to turn off the third switching unit when the third output current is less than a second preset threshold.
Optionally, the control module is further configured to apply a first level to the second switching unit to enable the second switching unit to be turned on when the first output current is greater than a first preset threshold value, and apply a first level to the third switching unit to enable the third switching unit to be turned on when the third output current is greater than a second preset threshold value.
Optionally, the control module is further configured to apply a first level to the first switching unit to enable the first switching unit to be turned on when the first output current is equal to a first preset threshold value, and apply a first level to the third switching unit to enable the third switching unit to be turned on when the third output current is equal to a second preset threshold value.
Optionally, the control module is further configured to apply a first level to the second switching unit to enable the second switching unit to be turned on when the first output current is equal to a first preset threshold value, and apply a first level to the fourth switching unit to enable the fourth switching unit to be turned on when the third output current is equal to a second preset threshold value.
Correspondingly, the technical scheme of the invention also provides a working method of the energy storage conversion circuit, which comprises the steps of applying a first switching frequency to a first switching module to enable a first output current of an output end of the conversion circuit to reach a first preset threshold value, and applying a second switching frequency to a second switching module to enable a third output current of the output end of the conversion circuit to reach a second preset threshold value.
Optionally, the working method of the energy storage conversion circuit further comprises the steps of adjusting the duty ratio of the first switch module according to the first output current and the first preset threshold value, and adjusting the duty ratio of the second switch module according to the third output current and the second preset threshold value.
Optionally, adjusting the duty cycle of the first switch module and the second switch module includes applying a first level to a first switch unit to turn on the first switch unit when the first output current is less than a first preset threshold, and applying a second level to a third switch unit to turn off the third switch unit when the third output current is less than a second preset threshold.
Optionally, adjusting the duty ratio of the first switch module and the second switch module further includes applying a first level to the second switch unit to turn on the second switch unit when the first output current is greater than a first preset threshold, and applying a first level to the third switch unit to turn on the third switch unit when the third output current is greater than a second preset threshold.
Optionally, adjusting the duty ratio of the first switch module and the second switch module further includes applying a first level to the first switch unit to turn on the first switch unit when the first output current is equal to a first preset threshold, and applying a first level to the third switch unit to turn on the third switch unit when the third output current is equal to a second preset threshold.
Optionally, adjusting the duty ratio of the first switch module and the second switch module further includes applying a first level to the second switch unit to turn on the second switch unit when the first output current is equal to a first preset threshold, and applying a first level to the fourth switch unit to turn on the fourth switch unit when the third output current is equal to a second preset threshold.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
According to the energy storage conversion circuit provided by the technical scheme of the invention, each phase conversion circuit is divided into the first switch module and the second switch module, and the first switch module and the second switch module are controlled through different switch frequencies, so that the power consumption of the first switch module is reduced under the switch frequency of low frequency, the dynamic performance of the second switch module under the switch frequency of high frequency is ensured, the performance of the energy storage conversion circuit is further improved, and under different switch frequencies, the output currents of the first switch module and the second switch module are different, the third output current of the energy storage conversion circuit is increased, the output capacity of the energy storage conversion circuit for large current is ensured, and the performance of the energy storage conversion circuit is further improved.
Further, in the energy storage conversion circuit provided by the technical scheme of the invention, the first switch module comprises the first switch unit and the second switch unit, the second switch module comprises the third switch unit and the fourth switch unit, and the flexible adjustment of the third output current of the energy storage conversion circuit is realized and the accuracy of the third output current of the energy storage conversion circuit is improved by controlling the complementary conduction of the first switch unit and the second switch unit and the complementary conduction of the third switch unit and the fourth switch unit.
Furthermore, in the energy storage conversion circuit provided by the technical scheme of the invention, the first inductor is connected into the first switch module, so that the first output current output by the first switch module is continuous by utilizing the characteristic that the current on the inductor cannot be suddenly changed, and the stability of the output current is ensured.
According to the working method of the energy storage conversion circuit, the first switch module and the second switch module are controlled through different switch frequencies, so that the power consumption of the first switch module is reduced under the low-frequency switch frequency, meanwhile, the dynamic performance of the second switch module under the high-frequency switch frequency is guaranteed, the performance of the energy storage conversion circuit is further improved, and under different switch frequencies, the output currents of the first switch module and the second switch module are different, the third output current of the energy storage conversion circuit is increased, the high-current output capacity of the energy storage conversion circuit is guaranteed, and the performance of the energy storage conversion circuit is further improved.
Furthermore, according to the working method of the energy storage conversion circuit provided by the technical scheme of the invention, the flexible adjustment of the third output current of the energy storage conversion circuit is realized and the accuracy of the third output current of the energy storage conversion circuit is improved by controlling the complementary conduction of the first switch unit and the second switch unit and the complementary conduction of the third switch unit and the fourth switch unit.
Drawings
FIG. 1 is a schematic diagram of a tank circuit;
FIG. 2 is a schematic diagram of a tank circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a phase change circuit in a tank circuit according to an embodiment of the present invention;
Fig. 4 is a schematic diagram of a phase change circuit in the energy storage conversion circuit according to an embodiment of the present invention.
Detailed Description
As known from the background art, the energy storage conversion circuit in the prior art has the problems of high loss of the power tube and low dynamic performance of the device, and the detection method of the existing energy storage conversion circuit is combined to analyze the reason:
Fig. 1 is a schematic diagram of the structure of the energy storage conversion circuit.
Referring to fig. 1, fig. 1 shows a structure of only one phase conversion circuit of the energy storage conversion circuits, wherein the energy storage conversion circuit comprises a plurality of phase conversion circuits 6, each phase conversion circuit 6 comprises a first input end, a second input end and an output end, the first input ends of the phase conversion circuits 6 are connected, the second input ends of the phase conversion circuits 6 are connected, each phase conversion circuit 6 comprises two switching tubes, a direct current input port 5, the direct current input port 5 is connected with the input ends of the plurality of phase conversion circuits 6, and an alternating current output port 7, and the alternating current output port 7 is connected with the output ends of the plurality of phase conversion circuits 6.
In the above scheme, the switching frequency of the switching module adopts a compromise choice, namely, a unified cover opening frequency is adopted to control the phase conversion circuit, so that the loss and the dynamic performance of the switching module are in medium values, but the problems of high loss and low dynamic performance of the switching module still exist in the above scheme.
In order to solve the technical problems, the technical scheme of the invention provides an energy storage conversion circuit and a working method thereof, wherein each phase conversion circuit is divided into a first switch module and a second switch module, the first switch module and the second switch module are controlled through different switch frequencies, so that the power consumption of the first switch module is reduced under the switch frequency of low frequency, the dynamic performance of the second switch module under the switch frequency of high frequency is ensured, the performance of the energy storage conversion circuit is further improved, and the output currents of the first switch module and the second switch module are different under different switch frequencies, the third output current of the energy storage conversion circuit is increased, the output capacity of the energy storage conversion circuit for large current is ensured, and the performance of the energy storage conversion circuit is further improved.
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 2 is a schematic diagram of a tank circuit according to an embodiment of the invention.
Referring to fig. 2, the energy storage conversion circuit includes three phase conversion circuits 2, each phase conversion circuit 2 includes a first input terminal, a second input terminal and an output terminal, the first input terminals of each phase conversion circuit 2 are connected, and the second input terminals of each phase conversion circuit 2 are connected.
Fig. 3 is a schematic diagram of a phase conversion circuit in the energy storage conversion circuit according to an embodiment of the present invention.
Referring to fig. 3, each of the conversion circuits further includes a first switch module 201 and a second switch module 202, a dc input port 1, wherein the dc input port 1 is connected to a first input end and a second input end of each of the phase conversion circuits 2, and an ac output port 3, and the ac output port 3 is connected to an output end of each of the phase conversion circuits 2.
The first switching module 201 is configured to output a first output current I1 according to a first switching frequency.
The second switching module 202 is configured to output a second output current I2 according to a second switching frequency, the first switching frequency is smaller than the second switching frequency, and an output end of the conversion circuit is configured to output a third output current I3, where the third output current I3 is a sum of the first output current I1 and the second output current I2.
The first switching frequency ranges from 500 hz to 1500 hz, and the second switching frequency ranges from 5000 hz to 10000 hz.
The first switch module 201 includes a first switch unit 2011 and a second switch unit 2012, where each of the first switch unit 2011 and the second switch unit 2012 includes a first end, a second end, and a control end, the first end of the first switch unit 2011 is connected to the dc input port 1, the second end of the first switch unit 2011 is connected to the first end of the second switch unit 2012 and the ac output port 3, the second end of the second switch unit 2012 is connected to the dc input port 1, the first switch unit 2011 and the second switch unit 2012 are used for being turned on or off according to the first switching frequency, and the on time of the first switch unit 2011 and the on time of the second switch unit 2012 are complementary.
The first switch module 201 is aimed at reducing the switching frequency to reduce the loss of the switching tube and the design requirement of the radiator of the device while improving the efficiency, and the second switch module 202 is aimed at increasing the control frequency of the energy storage conversion circuit to increase the bandwidth of the whole device. The third output current I3 is high-frequency high-current, so that the dynamic performance of high frequency is achieved, and the output capability of high current is ensured.
The second switch module 202 includes a third switch unit 2021 and a fourth switch unit 2022, where each of the third switch unit 2021 and the fourth switch unit 2022 includes a first end, a second end, and a control end, the first end of the third switch unit 2021 is connected to the first end of the first switch unit 2011, the second end of the third switch unit 2021 is connected to the first end of the fourth switch unit 2022 and the ac output port 3, the second end of the fourth switch unit 2022 is connected to the second end of the second switch unit 2012, the third switch unit 2021 and the fourth switch unit 2022 are used for being turned on or off according to the second switching frequency, and the on time of the third switch unit 2021 and the fourth switch unit 2022 are complementary.
In the above scheme, each phase conversion circuit 2 is divided into the first switch module 201 and the second switch module 202, and the first switch module 201 and the second switch module 202 are controlled by different switch frequencies, so that the power consumption of the first switch module 201 is reduced under the switch frequency of low frequency, and the dynamic performance of the second switch module 202 under the switch frequency of high frequency is ensured, so that the performance of the energy storage conversion circuit is improved, and under different switch frequencies, the output currents of the first switch module 201 and the second switch module 202 are different, the third output current I3 of the energy storage conversion circuit is increased, the output capability of large current of the energy storage conversion circuit is ensured, and the performance of the energy storage conversion circuit is further improved.
In this embodiment, the dc input port 1 includes a positive bus voltage end+, a negative bus voltage end, and a first capacitor 101, where the first capacitor 101 is connected between the positive bus voltage end+ and the negative bus voltage end.
In this embodiment, the ac output port 3 includes three filtering modules 301 connected in parallel, and each filtering module 301 is connected to an output terminal of one of the phase conversion circuits 2.
In the above solution, the first switch module 201 includes a first switch unit 2011 and a second switch unit 2012, and the second switch module 202 includes a third switch unit 2021 and a fourth switch unit 2022, and by controlling complementary conduction of the first switch unit 2011 and the second switch unit 2012 and complementary conduction of the third switch unit 2021 and the fourth switch unit 2022, flexible adjustment of the third output current I3 of the energy storage conversion circuit is achieved, and accuracy of the third output current I3 of the energy storage conversion circuit is improved.
Fig. 4 is a schematic diagram of a phase change circuit in the energy storage conversion circuit according to an embodiment of the present invention.
Referring to fig. 4, the first switching unit 2011 includes a plurality of first switching tubes T1 connected in parallel, the second switching unit 2012 includes a plurality of second switching tubes T2 connected in parallel, the third switching unit 2021 includes a third switching tube T3, and the fourth switching unit 2022 includes a fourth switching tube T4.
The number of the first switching tubes T1 is the same as the number of the second switching tubes T2.
The filtering module 301 includes a second inductance 3011 and a second capacitance 3012 connected in parallel.
The conduction time of the first switching tube T1 is complementary with that of the second switching tube T2, and the conduction time of the third switching tube T3 is complementary with that of the fourth switching tube T4.
The first switching tube T1 is used for increasing the first output current I1, and the second switching tube T2 is used for decreasing the first output current I1.
In this embodiment, the first switching tube T1 and the second switching tube T2 include IGBTs, and the third switching tube T3 and the fourth switching tube T4 include MOS tubes.
Of course, the invention is not limited by this, and different types of switching tubes are selected according to the actual requirements of the energy storage conversion circuit so as to fully exert the large current characteristics and the high frequency characteristics of different switching tubes.
In this embodiment, the first switch module 201 further includes a first inductor 2013, a first end of the first inductor 2013 is connected to the output end of the first switch module 201, and a second end of the first inductor 2013 is connected to the output end of the second switch module 202.
Wherein i1=k×i, i3=i1+i2, where I1 is a first output current I1, I2 is a second output current I2, I3 is a third output current I3, K is a fixed ratio, and I is a second preset threshold.
In a specific embodiment, when the first output current I1 is less than k×i, the first switching tube T1 is turned on, the third switching tube T3 is turned off, and then the current of the second output current I2 flows through the freewheeling diode of the fourth switching tube T4, and no matter whether the fourth switching tube T4 is turned on or not, the voltage at two ends of the first inductor 2013 is the bus voltage, the first output current I1 becomes larger, when the first output current I1 is equal to k×i, the first switching tube T1 and the third switching tube T3 are turned on, or the second switching tube T2 and the fourth switching tube T4 are turned on, and then the output end of the third output current I3 automatically draws a current of about k×i from a position lower than the first output current I1, and the remaining current (i.e., the second output current I2) flows out from the third switching tube T3, and at this moment, because the voltage at two ends of the first switching tube T1 is 0V, the magnitude of the first output current I1 is not changed, and when the first output current I1 is greater than k×i, the first output current T2 is reduced, and the first output current I1 is turned on.
In this embodiment, K is 0.9 or 0.95.
In the above solution, the control target of the first switch module 201 is the first output current I1, the first output current I1 is controlled to a degree slightly smaller than the third output current I3, for example, i1=kχ I (k=0.95), because the control frequency of the power tube is relatively low, the current waveform of the first output current I1 may be a sine quantity with obvious up-down waveforms, and includes a large number of harmonics, so that the grid-connection requirement cannot be met, the control target of the second switch module 202 is the voltage of the ac output port 3, and the third switch tube T3 and the fourth switch tube T4 are designed based on the area equivalence principle, that is, the output characteristics of the two switch tubes of the second switch module 202 controlling the phase conversion circuit 2 are voltage controlled.
In addition, the first inductor 2013 is connected in the first switch module 201, so that the first output current I1 output by the first switch module 201 is continuous by utilizing the characteristic that the current on the inductor cannot be suddenly changed, and the stability of the output current is ensured.
The energy storage conversion circuit comprises a control module 4, wherein the control module 4 is used for applying a first switching frequency to the first switching module 201 so that a first output current I1 of an output end of the conversion circuit reaches a first preset threshold value, and applying a second switching frequency to the second switching module 202 so that a third output current I3 of the output end of the conversion circuit reaches a second preset threshold value.
The first preset threshold value is K x I, the second preset threshold value is I, and the value of K comprises 0.9 or 0.95. The control module 4 is further configured to adjust the duty cycle of the first switch module 201 according to the first output current I1 and the first preset threshold k×i, and adjust the duty cycle of the second switch module 202 according to the third output current I3 and the second preset threshold I.
The control module 4 is further configured to apply a first level to the first switching unit 2011 to turn on the first switching unit 2011 when the first output current I1 is less than a first preset threshold value k×i, and apply a second level to the third switching unit 2021 to turn off the third switching unit 2021 when the third output current I3 is less than a second preset threshold value I.
The control module 4 is further configured to apply a first level to the second switching unit 2012 when the first output current I1 is greater than a first preset threshold value k×i, so that the second switching unit 2012 is turned on, and apply a first level to the third switching unit 2021 when the third output current I3 is greater than a second preset threshold value I, so that the third switching unit 2021 is turned on.
The control module 4 is further configured to apply a first level to the first switch unit 2011 to turn on the first switch unit 2011 when the first output current I1 is equal to a first preset threshold value k×i, and apply a first level to the third switch unit 2021 to turn on the third switch unit 2021 when the third output current I3 is equal to a second preset threshold value I.
The control module 4 is further configured to apply a first level to the second switching unit 2012 when the first output current I1 is equal to a first preset threshold value k×i, such that the second switching unit 2012 is turned on, and apply a first level to the fourth switching unit 2022 when the third output current I3 is equal to a second preset threshold value I, such that the fourth switching unit 2022 is turned on.
Correspondingly, referring to fig. 4, the technical scheme of the present invention further provides a working method of the energy storage conversion circuit, which includes applying a first switching frequency to the first switching module 201 to enable a first output current I1 of an output end of the conversion circuit to reach a first preset threshold value, and applying a second switching frequency to the second switching module 202 to enable a third output current I3 of the output end of the conversion circuit to reach a second preset threshold value.
The first preset threshold value is K x I, the second preset threshold value is I, and the value of K comprises 0.9 or 0.95.
In this embodiment, the working method of the energy storage conversion circuit further includes adjusting the duty ratio of the first switch module 201 according to the first output current I1 and the first preset threshold k×i, and adjusting the duty ratio of the second switch module 202 according to the third output current I3 and the second preset threshold I.
In this embodiment, adjusting the duty cycle of the first switch module 201 and the second switch module 202 includes applying a first level to the first switch unit 2011 to turn on the first switch unit 2011 when the first output current I1 is less than a first preset threshold k×i, and applying a second level to the third switch unit 2021 to turn off the third switch unit 2021 when the third output current I3 is less than a second preset threshold I.
In this embodiment, adjusting the duty cycle of the first switch module 201 and the second switch module 202 further includes applying a first level to the second switch unit 2012 to turn on the second switch unit 2012 when the first output current I1 is greater than a first preset threshold value k×i, and applying a first level to the third switch unit 2021 to turn on the third switch unit 2021 when the third output current I3 is greater than a second preset threshold value I.
In this embodiment, adjusting the duty ratio of the first switch module 201 and the second switch module 202 further includes applying a first level to the first switch unit 2011 to turn on the first switch unit 2011 when the first output current I1 is equal to a first preset threshold value k×i, and applying a first level to the third switch unit 2021 to turn on the third switch unit 2021 when the third output current I3 is equal to a second preset threshold value I.
In this embodiment, adjusting the duty cycle of the first switch module 201 and the second switch module 202 further includes applying a first level to the second switch unit 2012 to turn on the second switch unit 2012 when the first output current I1 is equal to a first preset threshold value k×i, and applying a first level to the fourth switch unit 2022 to turn on the fourth switch unit 2022 when the third output current I3 is equal to a second preset threshold value I.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.
Claims (21)
1. A tank conversion circuit, comprising:
The three-phase conversion circuit comprises a first input end, a second input end and an output end, wherein the first input end of each phase conversion circuit is connected, the second input end of each phase conversion circuit is connected, each conversion circuit further comprises a first switch module and a second switch module, the first switch module is used for outputting a first output current according to a first switch frequency, the second switch module is used for outputting a second output current according to a second switch frequency, the first switch frequency is smaller than the second switch frequency, the output end of each conversion circuit is used for outputting a third output current, and the third output current is the sum of the first output current and the second output current;
the alternating current output port is connected with the output end of each phase conversion circuit;
The first switch module comprises a first switch unit and a second switch unit, the first switch unit and the second switch unit comprise a first end, a second end and a control end, the first end of the first switch unit is connected with the direct current input port, the second end of the first switch unit is connected with the first end of the second switch unit and the second switch module respectively, and the second end of the second switch unit is connected with the direct current input port;
The second switch module comprises a third switch unit and a fourth switch unit, wherein the third switch unit and the fourth switch unit comprise a first end, a second end and a control end, the first end of the third switch unit is connected with the first end of the first switch unit, the second end of the third switch unit is respectively connected with the first end of the fourth switch unit and an alternating current output port, and the second end of the fourth switch unit is connected with the second end of the second switch unit.
2. The tank circuit of claim 1, wherein the first switching unit and the second switching unit are configured to be turned on or off according to the first switching frequency, and wherein on-times of the first switching unit and the second switching unit are complementary.
3. The energy storage conversion circuit of claim 2, wherein the first switching unit comprises a number of first switching tubes connected in parallel, the second switching unit comprises a number of second switching tubes connected in parallel, and the number of first switching tubes is the same as the number of second switching tubes.
4. The energy storage conversion circuit of claim 2, wherein the first switch module further comprises a first inductor, a first end of the first inductor being connected to an output of the first switch module, and a second end of the first inductor being connected to an output of the second switch module.
5. The tank circuit of claim 4, wherein the third switching unit and the fourth switching unit are configured to turn on or off according to the second switching frequency, and wherein the turn-on times of the third switching unit and the fourth switching unit are complementary.
6. The tank circuit of claim 5, wherein the third switching unit comprises a third switching tube and the fourth switching unit comprises a fourth switching tube.
7. The energy storage conversion circuit of claim 1, wherein the dc input port comprises a bus positive voltage terminal, a bus negative voltage terminal, and a first capacitor, the first capacitor being connected between the bus positive voltage terminal and the bus negative voltage terminal.
8. The tank circuit of claim 1 wherein said ac output port comprises three filter modules connected in parallel, each of said filter modules being connected to an output of one of said phase conversion circuits.
9. The tank circuit of claim 8, wherein each of the three filter modules includes a second inductor and a second capacitor in parallel.
10. The energy storage conversion circuit of claim 6, further comprising a control module connected to control terminals of the first switching unit, the second switching unit, the third switching unit, and the fourth switching unit, respectively, wherein the control module is configured to apply a first switching frequency to the first switching module so that a first output current of an output terminal of the conversion circuit reaches a first preset threshold value, and apply a second switching frequency to the second switching module so that a third output current of the output terminal of the conversion circuit reaches a second preset threshold value.
11. The energy storage conversion circuit of claim 10, wherein the control module is further configured to adjust a duty cycle of the first switching module based on the first output current and the first preset threshold, and to adjust a duty cycle of the second switching module based on the third output current and the second preset threshold.
12. The tank circuit of claim 11, wherein the control module is further configured to apply a first level to the first switching element to turn the first switching element on when the first output current is less than a first preset threshold, and to apply a second level to the third switching element to turn the third switching element off when the third output current is less than a second preset threshold.
13. The tank circuit of claim 12, wherein the control module is further configured to apply a first level to the second switching element to turn on the second switching element when the first output current is greater than a first predetermined threshold, and to apply a first level to the third switching element to turn on the third switching element when the third output current is greater than a second predetermined threshold.
14. The tank circuit of claim 13, wherein the control module is further configured to apply a first level to the first switching element to turn the first switching element on when the first output current is equal to a first preset threshold, and to apply a first level to the third switching element to turn the third switching element on when the third output current is equal to a second preset threshold.
15. The tank circuit of claim 14, wherein the control module is further configured to apply a first level to the second switching element to turn on the second switching element when the first output current is equal to a first preset threshold, and to apply a first level to the fourth switching element to turn on the fourth switching element when the third output current is equal to a second preset threshold.
16. A method of operating a tank circuit as claimed in any one of claims 10 to 15, comprising:
Applying a first switching frequency to the first switching module to enable a first output current of an output end of the conversion circuit to reach a first preset threshold value, and applying a second switching frequency to the second switching module to enable a third output current of the output end of the conversion circuit to reach a second preset threshold value.
17. The method of claim 16, further comprising adjusting a duty cycle of the first switch module based on the first output current and the first predetermined threshold, and adjusting a duty cycle of the second switch module based on the third output current and the second predetermined threshold.
18. The method of claim 17, wherein adjusting the duty cycle of the first switching module and the second switching module comprises applying a first level to a first switching element to turn the first switching element on when the first output current is less than a first predetermined threshold, and applying a second level to a third switching element to turn the third switching element off when the third output current is less than a second predetermined threshold.
19. The method of claim 17, wherein adjusting the duty cycle of the first switching module and the second switching module further comprises applying a first level to the second switching unit to turn on the second switching unit when the first output current is greater than a first preset threshold, and applying a first level to the third switching unit to turn on the third switching unit when the third output current is greater than a second preset threshold.
20. The method of claim 17, wherein adjusting the duty cycle of the first switching module and the second switching module further comprises applying a first level to the first switching element to turn on the first switching element when the first output current is equal to a first predetermined threshold, and applying a first level to the third switching element to turn on the third switching element when the third output current is equal to a second predetermined threshold.
21. The method of claim 17, wherein adjusting the duty cycle of the first switching module and the second switching module further comprises applying a first level to the second switching unit to turn on the second switching unit when the first output current is equal to a first preset threshold, and applying a first level to the fourth switching unit to turn on the fourth switching unit when the third output current is equal to a second preset threshold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311594040.9A CN117559504B (en) | 2023-11-27 | 2023-11-27 | Energy storage conversion circuit and working method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311594040.9A CN117559504B (en) | 2023-11-27 | 2023-11-27 | Energy storage conversion circuit and working method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117559504A CN117559504A (en) | 2024-02-13 |
| CN117559504B true CN117559504B (en) | 2025-04-08 |
Family
ID=89814472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311594040.9A Active CN117559504B (en) | 2023-11-27 | 2023-11-27 | Energy storage conversion circuit and working method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117559504B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101411049A (en) * | 2006-03-03 | 2009-04-15 | 先进能源工业公司 | Interleaved soft switching bridge power converter |
| CN110474366A (en) * | 2019-08-05 | 2019-11-19 | 深圳市金宏威技术有限责任公司 | A kind of control system for three-phase tri-level photovoltaic combining inverter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115765516B (en) * | 2023-01-09 | 2023-05-02 | 西安图为电气技术有限公司 | Bidirectional energy storage converter and bidirectional power supply |
-
2023
- 2023-11-27 CN CN202311594040.9A patent/CN117559504B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101411049A (en) * | 2006-03-03 | 2009-04-15 | 先进能源工业公司 | Interleaved soft switching bridge power converter |
| CN110474366A (en) * | 2019-08-05 | 2019-11-19 | 深圳市金宏威技术有限责任公司 | A kind of control system for three-phase tri-level photovoltaic combining inverter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117559504A (en) | 2024-02-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103208929B (en) | Based on the electronic power transformer of MMC | |
| CN107968572B (en) | A DC solid-state transformer with fault ride-through capability and its control method | |
| CN106936319B (en) | An isolated three-port bidirectional DC-DC converter | |
| CN110336320B (en) | A new energy grid-connected or local consumption system based on power router | |
| CN107332443B (en) | A DC solid-state transformer and its control method | |
| CN203398807U (en) | Power mixed conversion system | |
| CN105576982A (en) | Non-isolated DC transformer | |
| CN110798074A (en) | A cascaded single-phase AC to DC isolation converter | |
| CN106533189A (en) | Power electronic transformer and control method thereof | |
| CN110048630B (en) | Five-level power electronic converter and control method | |
| CN202586797U (en) | Five-level variable-current topological structure with bidirectional power switches and application thereof | |
| CN107147303B (en) | A single-phase X-type interleaved three-level AC voltage regulating circuit | |
| CN102496932A (en) | Parallel voltage sag compensation device | |
| CN109713929B (en) | Three-phase three-switch two-level rectifier based on zero-voltage soft switch | |
| CN117559504B (en) | Energy storage conversion circuit and working method thereof | |
| CN108270356B (en) | DC distribution network energy router and its control method based on PWM/diode hybrid rectification structure | |
| CN108429481B (en) | SVPWM modulation method suitable for line voltage cascade type triple converter | |
| CN118300375A (en) | Grid-connected inverter based on coupling inductance and control method thereof | |
| CN204696955U (en) | A Photovoltaic Inverter Using Transformer Auxiliary Resonance | |
| CN215268097U (en) | Inverter and photovoltaic equipment | |
| CN116545255A (en) | Bipolar LLC resonant converter suitable for medium-voltage direct-current grid connection and control method thereof | |
| CN104218809A (en) | A circuit device integrating power factor correction and DC-DC conversion | |
| CN105429502B (en) | The double Cuk type inverters of the non-isolated no electrolytic capacitor of single-stage | |
| CN103208821A (en) | Power mixed conversion system | |
| CN204993043U (en) | Active filter based on three level are directly handed over - reversal parallel operation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |