CN111146932B - A DC-DC power transmission system - Google Patents
A DC-DC power transmission system Download PDFInfo
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- CN111146932B CN111146932B CN201911220324.5A CN201911220324A CN111146932B CN 111146932 B CN111146932 B CN 111146932B CN 201911220324 A CN201911220324 A CN 201911220324A CN 111146932 B CN111146932 B CN 111146932B
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/0074—Plural converter units whose inputs are connected in series
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a DC-DC power transmission system which comprises a first direct current port, a second direct current port, a DC-DC power converter and a unidirectional semiconductor switch, wherein the positive electrode and the negative electrode of the first direct current port are respectively connected with the positive electrode and the negative electrode of a direct current input port of the power converter and are respectively externally connected with a power supply direct current system, the positive electrode and the negative electrode of the second direct current port are respectively externally connected with the electric direct current system, the positive electrode of the direct current output port of the power converter is connected with the positive electrode of the unidirectional semiconductor switch, the negative electrode of the unidirectional semiconductor switch is connected with the negative electrode of the first direct current port, and the positive electrode of the unidirectional semiconductor switch is connected with the positive electrode of the unidirectional semiconductor switch. According to the invention, the unidirectional semiconductor switch is reversely connected in parallel between the positive electrode and the negative electrode of the direct current output port of the power converter, the positive electrode of the input end of the power converter is connected to the positive electrode of the unidirectional semiconductor switch, and when the power converter fails due to failure, the unidirectional semiconductor switch is used for recovering electric energy transmission, so that the reliability of an electric energy transmission system is improved, and the cost is greatly reduced.
Description
Technical Field
The invention belongs to the field of power transmission, and particularly relates to a DC-DC power transmission system.
Background
With the development of distributed power generation technology and direct current distribution technology, the demand for renewable energy power generation systems to be directly incorporated into a direct current distribution network via a DC-DC power transmission system is increasing. In a low-voltage low-capacity DC-DC power transmission system, a boost converter, a buck-boost converter and other basic DC-DC converters are the preferred technical schemes, but when the technical schemes are applied to a medium-high voltage high-capacity scene, the problems of high technical difficulty and high cost are faced, and the technical scheme has larger limitation. In the field of DC-DC power transmission with medium-high voltage and large capacity, a great deal of attention and research is paid to the technical scheme of DC-DC converters represented by DC autotransformers, DC transformers constructed based on double active bridge (Double Active Bridge, DAB) power units, and the like.
Patent application number 109600049a discloses a dc solid-state transformer, which is used for transmitting power, and the transmitted power needs to be converted twice, i.e. the dc power is converted into ac power, and then the ac power is further converted into dc power. The number of times of electric energy conversion is large, so that large electric energy loss is brought. When the direct current solid-state transformer is applied to medium and high voltage occasions, the defects of large number of power unit modules, complex system and high cost exist. In addition, when the direct current solid state transformer fails, the energy transmission channels between different direct current systems at the high and low voltage sides of the direct current solid state transformer are interrupted, and the reliability of energy transmission is reduced. Patent 201410024869.X proposes a three-dimensional dc-dc converter for interconnecting two dc systems of different voltage levels, the internal VSC converter unit of which adopts a three-phase voltage source converter structure. In the middle-high voltage application, patent 201410024869.X can solve the defects of large number of power unit modules, complex system, higher cost and high loss in patent 109600049A. But when the VSC converter unit inside the patent 201410024869.X fails due to a fault, the stereoscopic dc-dc converter will lose the power transmission capability, and there is also a problem of reliability of the power transmission.
Therefore, for the disclosed DC-DC converter (such as the boost converter, the direct current solid-state transformer, the three-dimensional direct current-direct current converter and the like), on one hand, when the DC-DC converter fails due to failure, an energy transmission channel between direct current systems at two sides of the DC-DC converter is interrupted, so that the reliability of the technical scheme needs to be further improved, and on the other hand, when some of the technical schemes disclosed in the prior art are applied to medium-high voltage occasions, the problems of large number of high-power unit modules, large capacity, complex system and high cost exist.
Disclosure of Invention
The invention provides a DC-DC power transmission system, which is used for solving the technical problem that the power transmission is interrupted and the power transmission cost is high when a DC-DC converter fails to transmit power in the existing power transmission system.
The technical scheme for solving the technical problems is that the DC-DC power transmission system comprises a first direct current port, a second direct current port, a DC-DC power converter and a unidirectional semiconductor switch;
The positive electrode and the negative electrode of the first direct current port are respectively connected with the positive electrode and the negative electrode of the direct current input port of the DC-DC power converter, and are also respectively externally connected with the positive end and the negative end of a power supply direct current system;
the positive electrode and the negative electrode of the second direct current port are respectively externally received by the positive electrode and the negative electrode of the electric direct current system, wherein the positive electrode is also connected with the positive electrode of the direct current output port of the DC-DC power converter and the negative electrode of the unidirectional semiconductor switch, and the negative electrode is also connected with the negative electrode of the first direct current port;
The positive pole of the unidirectional semiconductor switch is connected with the negative pole of the direct current output port of the DC-DC power converter, and the positive pole of the first direct current port is also connected with the positive pole of the unidirectional semiconductor switch.
The invention has the beneficial effects that the unidirectional semiconductor switch is reversely connected in parallel between the positive electrode and the negative electrode of the direct current output port of the DC-DC power converter, and the positive electrode of the input end of the DC-DC power converter is connected to the positive electrode of the unidirectional semiconductor switch, so that when the DC-DC power converter in the DC-DC power transmission system fails due to failure, the unidirectional semiconductor switch automatically resumes the power transmission between the power supply direct current system and the power receiving direct current system, thereby having the characteristic of zero response time, avoiding the interruption of the power transmission between the power supply direct current system and the power receiving direct current system and greatly improving the reliability and the availability of the DC-DC power transmission system. In addition, the positive electrode of the input end of the DC-DC power converter is connected to the negative electrode of the output end of the DC-DC power converter, and the negative electrode of the input end of the DC-DC power converter is further connected to the negative electrode of the second direct current port, so that the design capacity and the electric energy loss of the DC-DC power converter can be reduced, the volume and the cost of the DC-DC power converter are further reduced, and the economical efficiency of the DC-DC electric energy transmission system is greatly improved.
Based on the technical scheme, the invention can be improved as follows.
The number of the DC-DC power converters is n, n is a positive integer, when n is more than 1, n DC-DC power converters are connected in a combined mode, the positive electrode of a direct current input port of one DC-DC power converter is connected with the positive electrode of the first direct current port, the negative electrode of the direct current input port of one DC-DC power converter is connected with the negative electrode of the first direct current port, the positive electrode of a direct current output port of one DC-DC power converter is connected with the positive electrode of the second direct current port, and the negative electrode of the direct current output port of one DC-DC power converter is connected with the positive electrode of the unidirectional semiconductor switch.
Further, when n >1, the direct current input ports of the n DC-DC power converters are respectively connected with the first direct current ports in a parallel connection mode, and the direct current output ports of the n DC-DC power converters are respectively connected with the positive poles of the second direct current ports and the positive poles of the unidirectional semiconductor switches in a parallel connection mode.
The invention has the further beneficial effect that the integral current transmission capacity of the DC-DC power converter part is increased by respectively connecting the input ports and the output ports of the DC-DC power converter in parallel, thereby achieving the purpose of improving the power transmission capacity.
Further, when n >1, the direct current input ports of the n DC-DC power converters are respectively connected with the first direct current ports in a parallel connection mode, the direct current output ports of the n DC-DC power converters are connected in a series connection mode, the positive electrode of the direct current output port of one DC-DC power converter is connected with the positive electrode of the second direct current port, and the negative electrode of the direct current output port of one DC-DC power converter is connected with the positive electrode of the unidirectional semiconductor switch.
The invention has the further beneficial effects that the integral current tolerance of the input port of the DC-DC power converter part is increased by adopting a parallel connection mode through the input end of each DC-DC power converter, and the integral voltage tolerance of the output port of the DC-DC power converter is increased by adopting a serial connection mode through the output end of each DC-DC power converter, thereby achieving the purpose of improving the integral power transmission capacity of the DC-DC power converter part.
Further, when n >1, the direct current input ports of the n DC-DC power converters are connected in series, wherein the positive electrode of the direct current input port of one DC-DC power converter is connected with the positive electrode of the first direct current port, the negative electrode of the direct current input port of one DC-DC power converter is connected with the negative electrode of the second direct current port, the direct current output ports of the n DC-DC power converters are connected in series, the positive electrode of the direct current output port of one DC-DC power converter is connected with the positive electrode of the second direct current port, and the negative electrode of the direct current output port of one DC-DC power converter is connected with the positive electrode of the unidirectional semiconductor switch.
The invention has the further beneficial effects that the input end and the output end of each DC-DC power converter are respectively connected in series, so that the overall voltage tolerance capacity of the input end and the output end of the DC-DC power converter can be increased, and the purpose of improving the power transmission capacity of the DC-DC power converter is achieved.
Further, when n >1, the direct current input ports of the n DC-DC power converters are connected in series, wherein the positive electrode of the direct current input port of one DC-DC power converter is connected with the positive electrode of the first direct current port, the negative electrode of the direct current input port of one DC-DC power converter is connected with the negative electrode of the second direct current port, and the direct current output ports of the n DC-DC power converters are connected in parallel and are respectively connected with the positive electrode of the second direct current port and the positive electrode of the unidirectional semiconductor switch.
The invention has the further beneficial effects that the input ends of the DC-DC power converters are connected in series, so that the overall voltage tolerance of the input ports of the DC-DC power converter can be increased, and the output ports of the DC-DC power converters are connected in parallel, so that the overall current tolerance of the output ports of the DC-DC power converter can be increased, and the overall power transmission capacity of the DC-DC power converter can be greatly improved.
Further, the n DC-DC power converters have the same topology.
The invention has the further beneficial effect that the manufacturing difficulty of the n DC-DC power converters can be simplified.
Further, the n DC-DC power converters are each independently selected from:
DC-DC power converter based on double active bridge, bidirectional LLC resonant converter, bidirectional LLC converter with auxiliary inductance, bidirectional LLC converter with auxiliary capacitance, resonant converter based on double active bridge, resonant converter based on half bridge, BOOST converter, BUCK-BOOST converter, bidirectional half bridge converter.
The invention has the further beneficial effect of expanding the application field of the DC-DC power transmission system.
Further, the unidirectional semiconductor switch is a diode valve bank.
The power transmission branch circuit has the further beneficial effects that the diode valve group can enable the power transmission branch circuit after the failure of the DC-DC power converter to have better capacity of actively switching on and off, and the controllability of the branch circuit is improved.
Drawings
FIG. 1 is a schematic diagram of a prior art DC-DC converter;
Fig. 2 is a schematic diagram of a DC-DC power transmission system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a low-cost and high-reliability DC-DC power transmission system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another embodiment of a low-cost and high-reliability DC-DC power transmission system according to the present invention;
FIG. 5 is a schematic diagram of another embodiment of a low-cost and high-reliability DC-DC power transmission system according to the present invention;
FIG. 6 is a schematic diagram of another embodiment of a low-cost and high-reliability DC-DC power transmission system according to the present invention;
FIG. 7 is a schematic diagram of another embodiment of a low-cost and high-reliability DC-DC power transmission system according to the present invention;
FIG. 8 is a schematic diagram of a bi-directional LLC resonant converter;
FIG. 9 is a schematic diagram of a bi-directional LLC converter with added auxiliary inductance;
FIG. 10 is a schematic diagram of a bi-directional LLC converter with added auxiliary capacitance;
FIG. 11 is a schematic diagram of a bi-directional full-bridge LLC converter;
FIG. 12 is a schematic diagram of a bi-directional half-bridge LLC resonant converter;
fig. 13 is a schematic diagram of a bi-directional half-bridge inverter.
In all figures the same reference numerals are used to denote the same elements or structures, wherein 1, a power supply direct current system, 2, a power receiving direct current system, 3, a double active bridge inverter, 31, an inverter bridge, 32, a rectifier bridge, 4, an electric energy transmission system, 40, a first direct current port, 41, a second direct current port, 42, a DC-DC power converter, 43, a unidirectional semiconductor switch.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 1, a conventional DC-DC power converter 3 for transferring electric energy between a power supplying DC system 1 and a power receiving DC system 2 is shown in detail. When the power of the power supply DC system 1 is transmitted to the power receiving DC system 2, the power is first converted into high-frequency ac power by the inverter bridge 31 inside the DC-DC power converter 3, and then converted into DC power by the rectifier bridge 32 inside the DC-DC power converter 3. It can be seen that the power transmission process needs to undergo two-stage conversion of DC-ac-DC, and the capacity designs of the inverter unit 31 and the rectifier unit 32 need to be designed according to the actual transmission capacity, which results in a larger capacity requirement of power electronics in the DC-DC power converter. On the other hand, when the DC-DC power converter 3 fails due to a fault, the power transmission between the power supply direct current system 1 and the power receiving direct current system 2 is interrupted, and the power cannot be continuously transmitted.
As shown in fig. 2, the present embodiment provides a DC-DC power transmission system 4 including a first direct current port 40, a second direct current port 41, a DC-DC power converter 42, and a unidirectional semiconductor switch 43. The positive electrode and the negative electrode of the first direct current port are respectively connected with the positive electrode and the negative electrode of a direct current input port of the DC-DC power converter and are respectively externally connected with a positive port and a negative port of a power supply direct current system, the positive electrode and the negative electrode of the second direct current port are respectively externally connected with the positive electrode and the negative port of the power supply direct current system, the positive electrode is also connected with the positive electrode of a direct current output port of the DC-DC power converter and the negative electrode of a unidirectional semiconductor switch, the negative electrode is also connected with the negative electrode of the first direct current port, the positive electrode of the unidirectional semiconductor switch is also connected with the positive electrode of the unidirectional semiconductor switch.
It should be noted that the unidirectional semiconductor switch is a semiconductor switch device with limitation on both the opening direction and the current flowing direction, and the device can be opened only when the potential high-low direction meets the closing requirement, so that the current flowing direction is also limited, for example, a diode valve group, a semiconductor device (such as a thyristor), a fully-controlled semiconductor device (such as an insulated gate bipolar transistor IGBT) and the like are all unidirectional semiconductor switches, wherein, for example, the anode of the diode valve group is the anode of the unidirectional semiconductor switch, and the cathode of the diode valve group is the cathode of the unidirectional semiconductor switch.
The unidirectional semiconductor switch is connected in anti-parallel between the positive electrode and the negative electrode of the direct current output port of the DC-DC power converter, and meanwhile, the positive electrode of the input end of the DC-DC power converter is connected to the positive electrode of the unidirectional semiconductor switch, when the DC-DC power converter in the DC-DC power transmission system fails due to failure, the unidirectional semiconductor switch automatically resumes the power transmission between the power supply direct current system and the power receiving direct current system, the zero response time characteristic is achieved, the interruption of the power transmission between the power supply direct current system and the power receiving direct current system is avoided, and the reliability and the availability of the DC-DC power transmission system are greatly improved. In addition, the positive electrode of the input end of the DC-DC power converter is connected to the negative electrode of the output end of the DC-DC power converter, and the negative electrode of the input end of the DC-DC power converter is further connected to the negative electrode of the second direct current port, so that the design capacity and the electric energy loss of the DC-DC power converter can be reduced, the volume and the cost of the DC-DC power converter are further reduced, and the economical efficiency of the DC-DC electric energy transmission system is greatly improved.
For example, as shown in fig. 3, the unidirectional semiconductor switch 43 is a diode bank 43 including a first direct current port 40, a second direct current port 41, and a DC-DC power converter 42. The first DC port 40 is connected to the power supply DC system 1, and the positive electrode of the first DC port 40 is connected to the positive electrode of the power supply DC system 1, and the negative electrode of the first DC port 40 is connected to the negative electrode of the power supply DC system 1; the second direct current port 41 is connected to the power receiving direct current system 2, and the positive electrode of the second direct current port 41 is connected to the positive electrode of the power receiving direct current system 2, the negative electrode of the second direct current port 41 is connected to the negative electrode of the power receiving direct current system 2, the first direct current port 40 is also connected to the direct current input port of the DC-DC power converter 42, and the positive electrode of the first direct current port 40 is connected to the positive electrode of the direct current input port of the DC-DC power converter 42, the negative electrode of the first direct current port 40 is connected to the negative electrode of the direct current input port of the DC-DC power converter 42, the positive electrode of the second direct current port 41 is also connected to the positive electrode of the direct current output port of the DC-DC power converter 42, and the positive electrode of the direct current input port of the DC-DC power converter 42 is connected to the negative electrode of the direct current output port of the DC-DC power converter 42, the diode 43 is connected across the positive electrode of the direct current output port of the DC-DC power converter 42, and the positive electrode of the diode 43 is connected to the positive electrode of the direct current output valve block of the DC-DC power converter 42.
When the DC-DC power converter 42 works normally, the electric energy transmitted by the positive electrode of the first DC port enters the positive electrode of the DC input port of the DC-DC power converter 42 and flows into the negative electrode of the first DC port from the negative electrode of the DC input port of the DC-DC power converter 42, and after being converted by the DC-DC power converter 42, the electric energy is output by the positive electrode of the DC output port of the DC-DC power converter 42 and flows into the positive electrode of the second DC port to supply power to the power receiving DC system, and at the moment, the power receiving DC system forms a power supply loop through the negative electrode of the second DC port and the negative electrode of the first DC port. In this case, since the current flow of the diode pack is limited, no current flows through the current branch from the positive electrode of the first DC port to the negative electrode of the DC output port of the DC-DC power converter 42.
When the DC-DC power converter 42 fails or is actively locked, power transmitted from the positive pole of the first DC port directly enters the negative pole of the DC output port of the DC-DC power converter 42 and powers the powered DC system via the diode bank. The power transmission branch circuit after the failure of the DC-DC power converter has the capability of being actively switched on and off, and the controllability of the branch circuit is improved.
Preferably, the number of the DC-DC power converters is n, n is a positive integer, and when n is greater than 1, the n DC-DC power converters are connected in a combined manner, the positive electrode of the DC input port of one of the DC-DC power converters is connected to the positive electrode of the first DC port, the negative electrode of the DC input port of one of the DC-DC power converters is connected to the negative electrode of the first DC port, the positive electrode of the DC output port of one of the DC-DC power converters is connected to the positive electrode of the second DC port, and the negative electrode of the DC output port of one of the DC-DC power converters is connected to the positive electrode of the diode valve bank.
The number of the DC-DC power converters is not limited, and when a plurality of power converters are adopted, the power converters can be connected according to various different connection modes, only one positive and negative electrode port of an input end and one positive and negative electrode port of an output end are ensured to be respectively connected, and the compatibility of the electric energy transmission system to the DC-DC power converters is greatly improved.
Preferably, when n >1, as shown in fig. 4, the DC input ports of the n DC-DC power converters are connected with the first DC ports respectively in parallel connection, and the DC output ports of the n DC-DC power converters are connected with the anodes of the second DC ports and the diode valve group respectively in parallel connection.
The overall current transmission capacity of the DC-DC power converter part is increased by connecting the input port and the output port of the plurality of DC-DC power converters in parallel, thereby achieving the purpose of improving the power transmission capacity.
Preferably, when n >1, as shown in fig. 5, the DC input ports of the n DC-DC power converters are connected to the first DC port respectively in parallel connection, and the DC output ports of the n DC-DC power converters are connected in series, wherein the positive electrode of the DC output port of one DC-DC power converter is connected to the positive electrode of the second DC port, and the negative electrode of the DC output port of one DC-DC power converter is connected to the positive electrode of the diode valve bank.
The input end of each DC-DC power converter adopts a parallel connection mode to increase the integral current tolerance capability of the input port of the DC-DC power converter, and the output end of each DC-DC power converter adopts a serial connection mode to increase the integral voltage tolerance capability of the output port of the DC-DC power converter, so that the aim of improving the integral power transmission capability of the DC-DC power converter is fulfilled.
Preferably, when n >1, as shown in fig. 6, the DC input ports of the n DC-DC power converters are connected in series, wherein the positive electrode of the DC input port of one DC-DC power converter is connected to the positive electrode of the first DC port, the negative electrode of the DC input port of one DC-DC power converter is connected to the negative electrode of the second DC port, the DC output ports of the n DC-DC power converters are connected in series, the positive electrode of the DC output port of one DC-DC power converter is connected to the positive electrode of the second DC port, and the negative electrode of the DC output port of one DC-DC power converter is connected to the positive electrode of the diode valve bank.
The input end and the output end of each DC-DC power converter are respectively connected in series, so that the overall voltage tolerance capacity of the input end and the output end of the DC-DC power converter can be increased, and the purpose of improving the power transmission capacity of the DC-DC power converter is achieved.
Preferably, when n >1, as shown in fig. 7, the DC input ports of the n DC-DC power converters are connected in series, wherein the positive electrode of the DC input port of one DC-DC power converter is connected with the positive electrode of the first DC port, the negative electrode of the DC input port of one DC-DC power converter is connected with the negative electrode of the second DC port, and the DC output ports of the n DC-DC power converters are connected in parallel and are respectively connected with the positive electrode of the second DC port and the positive electrode of the diode valve group.
The input ends of the DC-DC power converters are connected in series, so that the overall voltage tolerance of the input ports of the DC-DC power converter part can be increased, and the output ports of the DC-DC power converters are connected in parallel, so that the overall current tolerance of the output ports of the DC-DC power converter part can be increased, and the overall power transmission capacity of the DC-DC power converter part can be greatly improved.
Preferably, the n DC-DC power converters have the same topology.
Preferably, the n DC-DC power converters are independently selected from:
A DC-DC power converter based on a Double Active Bridge (DAB), a bidirectional LLC resonant converter, a bidirectional LLC converter with added auxiliary inductance, a bidirectional LLC converter with added auxiliary capacitance, a resonant converter based on a Double Active Bridge (DAB), a resonant converter based on a half bridge, a BOOST converter, a BUCK-BOOST converter, a bidirectional half bridge converter.
All are well known circuits in the art, for example, in which a bidirectional LLC resonant converter is shown in fig. 8, a bidirectional LLC converter with added auxiliary inductance is shown in fig. 9, a bidirectional LLC converter with added auxiliary capacitance is shown in fig. 10, a bidirectional full-bridge LLC converter is shown in fig. 11, a bidirectional half-bridge LLC resonant converter is shown in fig. 12, and a bidirectional half-bridge converter is shown in fig. 13.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (6)
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|---|---|---|---|---|
| KR101387682B1 (en) * | 2012-10-17 | 2014-04-22 | 한국전기연구원 | Converter for power supply with transient state protection and redundancy and operation method thereof |
| WO2015091590A2 (en) * | 2013-12-18 | 2015-06-25 | Danmarks Tekniske Universitet | Step-up dc-dc power converter |
| WO2015110427A1 (en) * | 2014-01-22 | 2015-07-30 | Danmarks Tekniske Universitet | Resonant step-down dc-dc power converters |
| CN108173441A (en) * | 2018-01-09 | 2018-06-15 | 青岛大学 | Series connection while forward DC chopper-type single-stage multi input annulus inverter in high frequency of powering |
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2019
- 2019-12-03 CN CN201911220324.5A patent/CN111146932B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN211127568U (en) * | 2019-12-03 | 2020-07-28 | 华中科技大学 | DC-DC electric energy transmission system |
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