CN113193760A - Power electronic transformer with energy storage device - Google Patents
Power electronic transformer with energy storage device Download PDFInfo
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- CN113193760A CN113193760A CN202110494702.XA CN202110494702A CN113193760A CN 113193760 A CN113193760 A CN 113193760A CN 202110494702 A CN202110494702 A CN 202110494702A CN 113193760 A CN113193760 A CN 113193760A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 35
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 238000002955 isolation Methods 0.000 claims abstract description 9
- 239000003990 capacitor Substances 0.000 claims description 23
- 238000004804 winding Methods 0.000 claims description 8
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 2
- 238000013016 damping Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 238000004870 electrical engineering Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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Classifications
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- 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
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- 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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention relates to a power electronic transformer with an energy storage device. The power electronic transformer includes: the high-voltage side of the power electronic transformer is connected with a 10kV power distribution network, the low-voltage side of the power electronic transformer is connected with a 400V-grade power distribution network, three-phase 10kV alternating-current voltage is subjected to voltage division and isolation conversion through an A-phase circuit, a B-phase circuit and a C-phase circuit, high-voltage alternating current is converted into direct current and is connected with direct-current buses P and N, and the direct-current buses P and N are electrically connected with an energy-storage type Quasi-Z source inverter to convert the direct current into the three-phase 400V-grade alternating-current low-voltage power distribution network. The power electronic transformer provided by the invention reduces the number of high-frequency transformers and sub-modules, improves the power density of the power electronic transformer, can effectively inhibit harmonic waves brought to a superior power distribution network by the power electronic transformer, maintains the stability of a low-voltage power distribution network under the condition of ensuring the quality of electric energy, can participate in the voltage/frequency regulation of the superior power distribution network, and has certain inertia and damping.
Description
Technical Field
The invention relates to the technical field of electrical engineering, in particular to a power electronic transformer with an energy storage device.
Background
The power electronic transformer combines a power electronic device and a high-frequency transformer, realizes electric energy conversion by a power electronic converter technology, has the basic functions of voltage conversion, electrical isolation, energy transfer and the like, has high controllability, can realize the advantages of waveform, tide, electric energy quality control, automatic protection control and the like, and is ideal distribution equipment for a power distribution network. The method is widely applied to a vehicle-mounted converter system for electric locomotive traction, a smart grid/energy internet and a distributed renewable energy power generation grid-connected system.
The output end of the conventional power electronic transformer adopts a conventional inverter, and in order to prevent the damage of the inverter caused by the simultaneous conduction of the upper switching tube and the lower switching tube of the same inverter bridge arm, dead time is often added into the switching signals of the switching tubes of the bridge arm, so that the waveform of the output alternating voltage is distorted. In addition, the topology does not have a modular structure, and the circuit topology becomes extremely complex with the increase of the number of levels, so that a power electronic transformer with an energy storage device is needed.
Disclosure of Invention
The invention aims to provide a power electronic transformer with an energy storage device, which is used for solving the problems in the prior art.
In order to achieve the purpose, the invention provides the following scheme:
a high-voltage side of a power electronic transformer with an energy storage device is connected with a 10kV power distribution network, and a low-voltage side of the power electronic transformer is connected with a 400V-grade power distribution network; the power electronic transformer includes: the system comprises an A-phase circuit, a B-phase circuit, a C-phase circuit and an energy storage type Quasi-Z source inverter;
the tail end x of the phase A circuit and the tail end y of the phase B circuit are electrically connected with the tail end z of the phase C circuit to form a common point o;
the A-phase circuit, the B-phase circuit and the C-phase circuit are all used for carrying out voltage division and isolation transformation on three-phase 10kV alternating-current voltage to obtain direct current, and the direct current is input into a direct-current bus;
the energy storage type Quasi-Z source inverter is electrically connected with the direct current buses P and N; the energy storage type Quasi-Z source inverter is used for reducing 10kV alternating current into 400V-level alternating current; the energy storage type Quasi-Z source inverter is also used for connecting a capacitor C3The distributed direct current is converted into three-phase 400V-grade alternating current and is input into a low-voltage distribution network; the energy storage type Quasi-Z source inverter is also used for coupling a direct current load at the storage battery B1 to supply power to the direct current load.
Optionally, the structure of the a-phase circuit is the same as the structure of the B-phase circuit and the structure of the C-phase circuit.
Optionally, the a-phase circuit comprises an input stage and an isolated transform stage;
the input stage includes: 9 cascaded H-bridge linked modules;
the isolated transform stage comprises: 3 cascaded unit modules.
Optionally, the unit module: 3 primary side multiple windings and a secondary side single winding.
Optionally, the H-bridge linking module comprises: four full-control type switching devices SAi, SAi +1, SAi +2 and SAi +3 and a capacitor CAm;
the collector of the fully-controlled switching device SAi is connected with the collector of the fully-controlled switching device SAi +1 and is connected to one end of the capacitor CAm;
the emitter of the fully-controlled switching device SAi +2 is connected with the emitter of the fully-controlled switching device SAi +3 and is connected to the other end of the capacitor CAm;
an emitter of the full-control type switching device SAi is connected with a collector of the full-control type switching device SAi +2 to serve as a connecting terminal; and the emitter of the fully-controlled switching device SAi +1 is connected with the collector of the fully-controlled switching device SAi +3 to serve as a connecting terminal.
Optionally, the energy storage type Quasi-Z source inverter includes: inductor L1Fully-controlled switch device S7And a capacitor C2；
The inductance L1One end of the inductor L is connected with a direct current bus P, and the inductor L1The other end of the first and second switches is connected with a fully-controlled switch device S7Said fully controlled switching device S7Collector series inductance L2And a capacitor C2Rear connection of the fully-controlled switching device S7Said fully controlled switching device S7Collector shunt capacitance C1And a secondary battery B1A rear-connected DC bus N, the inductor L2And said capacitor C2Is connected with a fully-controlled switching device S1、S3And S5The direct current bus N is connected with a fully-controlled switch device S4、S6And S2Said fully controlled switching device S1And said fully controlled switching device S4Is connected as an output terminal a, said fully-controlled switching device S3And said fully controlled switching device S6Is connected as an output terminal b, said fully-controlled switching device S5And said fully controlled switching device S2Is connected as output terminal c.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the power electronic transformer with the energy storage device has the characteristics of high voltage and small current on the high-voltage side and low voltage and large current on the low-voltage side, reduces the number of transformers and submodules, and improves the power density of the power electronic transformer.
In the process of electric energy conversion and energy fluctuation, the grid-connected point current THD of the upper-level distribution network side is small enough, and harmonic waves brought to the upper-level distribution network by the power electronic transformer can be effectively inhibited.
The power electronic transformer provided by the invention has good power tracking performance, maintains the stability of a low-voltage distribution network under the condition of ensuring the quality of electric energy, can also participate in the voltage/frequency regulation of a superior distribution network, and has certain inertia and damping.
The power electronic transformer provided by the invention can conveniently realize the grid connection of distributed direct-current power supplies such as photovoltaic cell panels, storage batteries and the like, and can also provide corresponding direct-current power supplies for direct-current loads for charging or driving direct-current motors and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a power electronic transformer with an energy storage device according to the present invention;
fig. 2 is a circuit diagram of each phase of a power electronic transformer with an energy storage device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an H-bridge connection module of a power electronic transformer with an energy storage device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a power electronic transformer with an energy storage device, which can maintain the stability of a low-voltage distribution network and realize friendly support on a superior distribution network at the same time, and aims at solving the problem of unstable voltage/frequency of the distribution network caused by the intermittence and power fluctuation of high-permeability distributed power generation.
The power electronic transformer provided by the invention can obtain power buffering through the direct current interface, so that the PET has the capacity of participating in voltage/frequency regulation of a superior distribution network while maintaining the power consumption of a low-voltage distribution network.
Aiming at the defects in the prior art, in the isolation conversion stage, the high-frequency transformer is formed by cascading unit modules with a fixed number of primary side multi-windings and secondary side single-windings, and is simple in structure and convenient to expand. The output end adopts a unique impedance network, so that the upper and lower switching tubes of the same bridge arm are allowed to be simultaneously conducted, and the output end has a certain voltage boosting and reducing function. Since the through state is the normal operation state of the Z-source inverter, dead time does not need to be inserted in the commutation process.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1, the present invention provides a power electronic transformer with an energy storage device, comprising: the power electronic transformer comprises an A-phase circuit, a B-phase circuit, a C-phase circuit and an energy storage type Quasi-Z source inverter, wherein the high voltage side of a power electronic transformer is connected with a 10kV power distribution network, a wiring terminal is A, B, C, the tail end x of the A-phase circuit and the tail end y of the B-phase circuit are both electrically connected with the tail end Z of the C-phase circuit to form a common point o, the low voltage side of the power electronic transformer is connected with a 400V-grade power distribution network, and the wiring terminals are a, B and C;
the three-phase 10kV alternating-current voltage is subjected to voltage division and isolation conversion through the A-phase circuit, the B-phase circuit and the C-phase circuit, high-voltage alternating current is converted into direct current and is connected with direct-current buses P and N, and the direct-current buses P and N are electrically connected with an energy-storage type Quasi-Z source inverter to convert the direct current into a three-phase 400V-grade alternating-current low-voltage power distribution network.
The energy storage type Quasi-Z source inverter comprises: inductor L1Fully-controlled switch device S7And a capacitor C2Said inductance L1One end of the inductor L is connected with a direct current bus P, and the inductor L1The other end of the first and second switches is connected with a fully-controlled switch device S7Said fully controlled switching device S7Collector series inductance L2And a capacitor C2Rear connection of the fully-controlled switching device S7Said fully controlled switching device S7Collector shunt capacitance C1And a secondary battery B1A rear-connected DC bus N, the inductor L2And said capacitor C2Is connected with a fully-controlled switching device S1、S3And S5The direct current bus N is connected with a fully-controlled switch device S4、S6And S2Said fully controlled switching device S1And said fully controlled switching device S4Is connected as an output terminal a, said fully-controlled switching device S3Is connected to the collector of said fully controlled switching device S6 as output terminal b, said fully controlled switching device S5And said fully controlled switching device S2Is connected as output terminal c.
The unique structure allows the switching tubes on the same bridge arm to be instantly connected in a straight-through manner, so that the safety and the reliability of the system are improved; in addition, the voltage boosting and reducing function of the system is flexibly controlled by introducing the direct connection quantity, so that the defect that the traditional voltage type inverter can only reduce the voltage is overcome; furthermore, compared with the traditional single-stage or two-stage inverter, the single-stage power conversion type buck-boost inverter realizes the buck-boost and inversion functions. In addition, due to the inductance L1So that the current flowing into the output stage is continuously constantConstant, and due to the voltage dividing effect, the capacitor C2The voltage on the device is small, and the voltage stress borne by the device is small.
Referring to fig. 2, the a-phase circuit includes an input stage and an isolation conversion stage, the input stage adopts a cascade H-bridge multi-level topology, and is formed by cascading 9H-bridge connection modules, so as to reduce the voltage shared to each switching tube;
the isolation conversion stage adopts a multi-drive-bridge topology to control energy to flow bidirectionally and is formed by cascading 3 unit modules, each unit module is formed by coupling 3 primary-side multi-windings and one secondary-side single winding, the front stage is respectively connected with a direct current capacitor of the H-bridge connection module, the rear stage is connected in parallel to form a direct current bus, the positive electrode of the direct current bus is connected with the P direct current bus, and the negative electrode of the direct current bus is connected with the N direct current bus; the A-phase circuit structure is the same as the B-phase circuit structure and the C-phase circuit structure, each phase is formed by combining a plurality of unit modules, the structure is simple, and the expansion is convenient.
Referring to fig. 3, the H-bridge connection module includes four fully-controlled switching devices SAi, SAi +1, SAi +2, SAi +3 and a capacitor CAm, wherein a collector of the fully-controlled switching device SAi is connected to a collector of the fully-controlled switching device SAi +1 and is connected to one end of the capacitor CAm, an emitter of the fully-controlled switching device SAi +2 is connected to an emitter of the fully-controlled switching device SAi +3 and is connected to the other end of the capacitor CAm, an emitter of the fully-controlled switching device SAi is connected to a collector of the fully-controlled switching device SAi +2 as a connection terminal, and an emitter of the fully-controlled switching device SAi +1 is connected to a collector of the fully-controlled switching device SAi +3 as a connection terminal; high-voltage power frequency alternating current is converted into 9 suspension direct currents, and the input-stage power device can be applied to high voltage and high power with smaller voltage stress and switching frequency due to the cascade multilevel structure.
In conclusion, the power electronic transformer provided by the invention has the characteristics of high voltage and small current at a high-voltage side and low voltage and large current at a low-voltage side, the number of the transformers and the submodules is reduced, and the power density of the power electronic transformer is improved; in the process of electric energy conversion and energy fluctuation, the grid-connected point current THD of the upper-level distribution network side is small enough, so that harmonic waves brought to the upper-level distribution network by the power electronic transformer can be effectively inhibited; the power electronic transformer provided by the invention has good power tracking performance, maintains the stability of a low-voltage distribution network under the condition of ensuring the quality of electric energy, can also participate in the voltage/frequency regulation of a superior distribution network, and has certain inertia and damping.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (6)
1. A power electronic transformer with an energy storage device is characterized in that the high voltage side of the power electronic transformer is connected with a 10kV power distribution network, and the low voltage side of the power electronic transformer is connected with a 400V-grade power distribution network; the power electronic transformer includes: the system comprises an A-phase circuit, a B-phase circuit, a C-phase circuit and an energy storage type Quasi-Z source inverter;
the tail end x of the phase A circuit and the tail end y of the phase B circuit are electrically connected with the tail end z of the phase C circuit to form a common point o;
the A-phase circuit, the B-phase circuit and the C-phase circuit are all used for carrying out voltage division and isolation transformation on three-phase 10kV alternating-current voltage to obtain direct current, and the direct current is input into a direct-current bus;
the energy storage type Quasi-Z source inverter is electrically connected with the direct current buses P and N; the energy storage type Quasi-Z source inverter is used for reducing 10kV alternating current into 400V-level alternating current; the energy storage type Quasi-Z source inverter is also used for connecting a capacitor C3The distributed direct current is converted into three-phase 400V-grade alternating current and inputA low voltage distribution network; the energy storage type Quasi-Z source inverter is also used for coupling a direct current load at the storage battery B1 to supply power to the direct current load.
2. The power electronic transformer with the energy storage device as claimed in claim 1, wherein the structure of the a-phase circuit is the same as the structure of the B-phase circuit and the structure of the C-phase circuit.
3. The power electronic transformer with the energy storage device as claimed in claim 2, wherein the a-phase circuit comprises an input stage and an isolation conversion stage;
the input stage includes: 9 cascaded H-bridge linked modules;
the isolated transform stage comprises: 3 cascaded unit modules.
4. A power electronic transformer with an energy storage device according to claim 3, characterized in that said unit modules: 3 primary side multiple windings and a secondary side single winding.
5. The power electronic transformer with an energy storage device of claim 3, wherein the H-bridge connection module comprises: four full-control type switching devices SAi, SAi +1, SAi +2 and SAi +3 and a capacitor CAm;
the collector of the fully-controlled switching device SAi is connected with the collector of the fully-controlled switching device SAi +1 and is connected to one end of the capacitor CAm;
the emitter of the fully-controlled switching device SAi +2 is connected with the emitter of the fully-controlled switching device SAi +3 and is connected to the other end of the capacitor CAm;
an emitter of the full-control type switching device SAi is connected with a collector of the full-control type switching device SAi +2 to serve as a connecting terminal; and the emitter of the fully-controlled switching device SAi +1 is connected with the collector of the fully-controlled switching device SAi +3 to serve as a connecting terminal.
6. The power electronic transformer with an energy storage device according to claim 1, wherein the energy storage type Quasi-Z source inverter comprises: inductor L1Fully-controlled switch device S7And a capacitor C2；
The inductance L1One end of the inductor L is connected with a direct current bus P, and the inductor L1The other end of the first and second switches is connected with a fully-controlled switch device S7Said fully controlled switching device S7Collector series inductance L2And a capacitor C2The emitter of the fully-controlled switching device S7 is connected in a rear mode, and the collector of the fully-controlled switching device S7 is connected with a capacitor C in parallel1And a secondary battery B1A rear-connected DC bus N, the inductor L2And said capacitor C2Is connected with a fully-controlled switching device S1、S3And S5The direct current bus N is connected with a fully-controlled switch device S4、S6And S2Said fully controlled switching device S1And said fully controlled switching device S4Is connected as an output terminal a, said fully-controlled switching device S3And said fully controlled switching device S6Is connected as an output terminal b, said fully-controlled switching device S5And said fully controlled switching device S2Is connected as output terminal c.
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| CN202110494702.XA CN113193760A (en) | 2018-10-11 | 2018-10-11 | Power electronic transformer with energy storage device |
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| CN201811185378.8A CN109067195A (en) | 2018-10-11 | 2018-10-11 | A kind of electric power electric transformer with energy storage device |
| CN202110494702.XA CN113193760A (en) | 2018-10-11 | 2018-10-11 | Power electronic transformer with energy storage device |
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| CN101917017A (en) * | 2010-07-21 | 2010-12-15 | 北京交通大学 | Single-stage boosting/reducing energy storage type photovoltaic grid-connected power generation control system |
| CN204707045U (en) * | 2015-04-27 | 2015-10-14 | 湖南大学 | A kind of power distribution network electric power electric transformer |
| CN207354062U (en) * | 2017-06-22 | 2018-05-11 | 张东胜 | A kind of electronic potential device |
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| CN101795081A (en) * | 2010-03-03 | 2010-08-04 | 中国科学院电工研究所 | Power electronic transformer having multi-winding isolation transformer |
| CN102185533B (en) * | 2011-05-23 | 2013-05-15 | 北京交通大学 | Stored energy type standard-Z source photovoltaic power generation control system and method |
| CN207459728U (en) * | 2017-08-28 | 2018-06-05 | 杭州模储科技有限公司 | A kind of accumulation energy type multiport electric power electric transformer |
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2018
- 2018-10-11 CN CN202110494702.XA patent/CN113193760A/en active Pending
- 2018-10-11 CN CN201811185378.8A patent/CN109067195A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101917017A (en) * | 2010-07-21 | 2010-12-15 | 北京交通大学 | Single-stage boosting/reducing energy storage type photovoltaic grid-connected power generation control system |
| CN204707045U (en) * | 2015-04-27 | 2015-10-14 | 湖南大学 | A kind of power distribution network electric power electric transformer |
| CN207354062U (en) * | 2017-06-22 | 2018-05-11 | 张东胜 | A kind of electronic potential device |
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