CN109067195A - A kind of electric power electric transformer with energy storage device - Google Patents

A kind of electric power electric transformer with energy storage device Download PDF

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Publication number
CN109067195A
CN109067195A CN201811185378.8A CN201811185378A CN109067195A CN 109067195 A CN109067195 A CN 109067195A CN 201811185378 A CN201811185378 A CN 201811185378A CN 109067195 A CN109067195 A CN 109067195A
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CN
China
Prior art keywords
full
controlled switch
switch device
sai
collector
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Pending
Application number
CN201811185378.8A
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Chinese (zh)
Inventor
王继东
王衍衡
王梦迪
朱冷雪
李继方
李远骞
杨龙团
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North China University of Water Resources and Electric Power
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North China University of Water Resources and Electric Power
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Publication date
Application filed by North China University of Water Resources and Electric Power filed Critical North China University of Water Resources and Electric Power
Priority to CN201811185378.8A priority Critical patent/CN109067195A/en
Priority to CN202110494702.XA priority patent/CN113193760A/en
Publication of CN109067195A publication Critical patent/CN109067195A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M5/00Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40Conversion 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
    • H02M5/42Conversion 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
    • H02M5/44Conversion 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
    • H02M5/453Conversion 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
    • H02M5/458Conversion 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
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for AC mains or AC distribution networks
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for AC mains or AC distribution networks
    • H02J3/01Arrangements for reducing harmonics or ripples
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of DC power input into DC power output
    • H02M3/22Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28Conversion 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
    • H02M3/325Conversion 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
    • H02M3/335Conversion 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
    • H02M3/33569Conversion 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
    • H02M3/33576Conversion 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
    • H02M3/33584Bidirectional converters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M7/00Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48Conversion 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
    • H02M7/53Conversion 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
    • H02M7/537Conversion 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
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40Arrangements for reducing harmonics

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

本发明公开了一种带储能装置的电力电子变压器,涉及电气工程技术领域,包括:电力电子变压器高压侧接10kV配电网,电力电子变压器低压侧接400V等级配电网,三相10kV交流电压通过A相电路、B相电路和C相电路进行分压与隔离变换,将高压交流电变换为直流电,均连接直流母线P和N,直流母线P和N电性连接储能型Quasi‑Z源逆变器将直流电变换为三相400V等级交流电接低压配电网。本发明提出的电力电子变压器减少了高频变压器与子模块数量,提高了电力电子变压器的功率密度,能有效地抑制电力电子变压器给上级配电网带来的谐波,在保证电能质量的情况下,维持低压配电网稳定,还能参与上级配电网的电压/频率调节,并具有一定的惯性与阻尼。

The invention discloses a power electronic transformer with an energy storage device, which relates to the technical field of electrical engineering, comprising: the high voltage side of the power electronic transformer is connected to a 10kV distribution network, the low voltage side of the power electronic transformer is connected to a 400V grade distribution network, and a three-phase 10kV AC The voltage is divided and isolated through the A-phase circuit, B-phase circuit and C-phase circuit, and the high-voltage alternating current is converted into direct current. Both are connected to the DC bus P and N, and the DC bus P and N are electrically connected to the energy storage type Quasi-Z source The inverter converts the direct current into a three-phase 400V level alternating current for connection to the low-voltage distribution network. The power electronic transformer proposed in the present invention reduces the number of high-frequency transformers and sub-modules, improves the power density of the power electronic transformer, and can effectively suppress the harmonics brought by the power electronic transformer to the upper distribution network. It can maintain the stability of the low-voltage distribution network, and can also participate in the voltage/frequency regulation of the upper-level distribution network, and has a certain inertia and damping.

Description

A kind of electric power electric transformer with energy storage device
Technical field
The present invention relates to electrical engineering technical field, in particular to a kind of electric power electric transformer with energy storage device.
Background technique
Electric power electric transformer is a kind of to combine power electronic devices and high frequency transformer, pass through electronic power conversion Technology realizes the transformer of transformation of electrical energy, except converting with voltage, in addition to the basic functions such as electrical isolation, energy transmission, also has Controllability is high, and the advantages that controlling waveform, trend, utility power quality control and automatic protection may be implemented, and is power distribution network ideal Controller switching equipment.In the vehicle-mounted converter system, smart grid/energy internet and distributed type renewable of electric locomotive traction It is widely used in energy electricity generation grid-connecting system.
Conventional electric power electronic transformer output end uses conventional inverter, to prevent same inverter bridge leg or more switching tube same When conducting cause inverter to damage, dead time often is added in the switching signal of bridge arm switching tube, this make instead output hand over Galvanic electricity corrugating is distorted.In addition, topology does not have modular construction, and with the increase of level number, become circuit topology Must be extremely complex, so, it is necessary to a kind of electric power electric transformer with energy storage device.
Summary of the invention
The embodiment of the invention provides a kind of electric power electric transformers with energy storage device, deposit in the prior art to solve The problem of.
A kind of electric power electric transformer with energy storage device, comprising: A circuitry phase, B circuitry phase, C circuitry phase and accumulation energy type Quasi-Z source inventer, electric power electric transformer high pressure flank 10kV power distribution network, connecting terminal A, B, C, the A circuitry phase End x and the end y of the B circuitry phase be electrically connected with the end z of the C circuitry phase into common point o, the electric power electricity Sub- transformer low voltage flanks 400V grade power distribution network, connecting terminal a, b, c;
Three-phase 10kV alternating voltage by the A circuitry phase, the B circuitry phase and the C circuitry phase carry out partial pressure with every From transformation, High Level AC Voltage is transformed to direct current, is all connected with DC bus P and N, the DC bus P and N are electrically connected storage DC power conversion is that three-phase 400V grade alternating current connects low-voltage network by energy type Quasi-Z source inventer;
The A circuitry phase includes input stage and isolated variable grade, and the input stage is by 9 H bridging connection module cascaded series At the isolated variable grade is made of 3 unit module cascades, and the unit module is by 3 primary side Multiple coils and a secondary side Simplex winding is coupled to form, and the A circuitry phase structure and the B circuitry phase structure and the C circuitry phase structure are all the same.
Preferably, the accumulation energy type Quasi-Z source inventer includes: inductance L1, full-controlled switch device S7 and capacitor C2, One end of the inductance L1 connects DC bus P, and the other end of the inductance L1 connects the emitter of full-controlled switch device S7, The hair of the full-controlled switch device S7 is connected after the collector series inductance L2 and capacitor C2 of the full-controlled switch device S7 Emitter-base bandgap grading connects DC bus N after the collector shunt capacitance C1 and battery B1 of the full-controlled switch device S7, in the electricity Feel the collector that full-controlled switch device S1, S3 and S5 are connected between the L2 and capacitor C2, the DC bus N connection is controlled entirely The emitter of type switching device S4, S6 and S2, the emitter of the full-controlled switch device S1 and the full-controlled switch device The collector of S4 is connected to output end a, the emitter of the full-controlled switch device S3 and the full-controlled switch device S6 Collector be connected to output end b, the emitter of the full-controlled switch device S5 and the full-controlled switch device S2's Collector is connected to output end c.
Preferably, the H bridging connection module includes four full-controlled switch devices SAi, SAi+1, SAi+2, SAi+3 and electricity Hold CAm, the collector of the full-controlled switch device SAi is connected with the collector of the full-controlled switch device SAi+1 and connects It connects in the capacitor CAmOne end, the emitter of the full-controlled switch device SAi+2 and the full-controlled switch device SAi+3 Emitter be connected and be both connected to the capacitor CAmThe other end, the emitter of the full-controlled switch device SAi with it is described The collector of full-controlled switch device SAi+2 is connected to a connecting terminal, the transmitting of the full-controlled switch device SAi+1 The collector of pole and the full-controlled switch device SAi+3 are connected to a connecting terminal.
The invention has the advantages that:
(1), electric power electric transformer proposed by the present invention have high-pressure side high voltage, low current and low-pressure side low-voltage, The characteristics of high current, reduces transformer and submodule quantity, improves the power density of electric power electric transformer;
(2), for the present invention during transformation of electrical energy and energy fluctuation, higher level's distribution net side grid entry point electric current THD is enough It is small, electric power electric transformer can be effectively inhibited and give higher level's power distribution network bring harmonic wave;
(3), electric power electric transformer proposed by the invention has good power tracking performance, is guaranteeing power quality In the case where, maintenance low-voltage network is stablized, moreover it is possible to which the voltage/frequency for participating in higher level's power distribution network is adjusted, and has certain be used to Property with damping.
Detailed description of the invention
Fig. 1 is a kind of topological structure signal of electric power electric transformer with energy storage device provided in an embodiment of the present invention Figure;
Fig. 2 is a kind of every circuitry phase figure of the electric power electric transformer with energy storage device provided in an embodiment of the present invention;
Fig. 3 is a kind of H bridging connection module of the electric power electric transformer with energy storage device provided in an embodiment of the present invention Structural schematic diagram.
Specific embodiment
Below with reference to the attached drawing in inventive embodiments, technical solution in the embodiment of the present invention carries out clear, complete Description, it is to be understood that the protection scope of the present invention is not limited by the specific implementation manner.
Distribution network voltage caused by intermittence and power swing of the present invention for the power generation of high permeability distributed generation resource/ Frequency instability problem proposes a kind of new topological structure new suitable for three-phase 10kV/400V electric power electric transformer.It should The transformer of kind topological structure is also able to achieve close friend's support to higher level's power distribution network while maintaining low-voltage network to stablize.This Power buffering can be obtained by DC interface by inventing the electric power electric transformer proposed, to maintain low-voltage network function in PET While rate consumes, also there is the ability that higher level's distribution network voltage/frequency is adjusted that participates in.
The invention patent is directed to disadvantage existing in the prior art, and in isolated variable grade, high frequency transformer is using fixation The unit module that the primary side Multiple coil of number is coupled with secondary side simplex winding cascades, and structure is simple, convenient for extension.Output end is adopted With unique impedance network to allow same bridge arm or more switching tube to simultaneously turn on, it is made to have certain stepping functions. Due to the work normality that pass-through state is Z-source inverter, without being inserted into dead time in commutation course.
Referring to Fig.1, the present invention provides a kind of electric power electric transformers with energy storage device, comprising: A circuitry phase, B phase electricity Road, C circuitry phase and accumulation energy type Quasi-Z source inventer, electric power electric transformer high pressure flank 10kV power distribution network, and connecting terminal is A, the end y of B, C, the end x of the A circuitry phase and the B circuitry phase with the end z of the C circuitry phase be electrically connected at Common point o, the electric power electric transformer low pressure flank 400V grade power distribution network, connecting terminal a, b, c;
Three-phase 10kV alternating voltage by the A circuitry phase, the B circuitry phase and the C circuitry phase carry out partial pressure with every From transformation, High Level AC Voltage is transformed to direct current, is all connected with DC bus P and N, the DC bus P and N are electrically connected storage DC power conversion is that three-phase 400V grade alternating current connects low-voltage network by energy type Quasi-Z source inventer.
The accumulation energy type Quasi-Z source inventer includes: inductance L1, full-controlled switch device S7 and capacitor C2, the electricity The one end for feeling L1 connects DC bus P, and the emitter of the other end connection full-controlled switch device S7 of the inductance L1 is described complete The emitter of the full-controlled switch device S7, institute are connected after the collector series inductance L2 and capacitor C2 of control type switching device S7 State and connect DC bus N after the collector shunt capacitance C1 and battery B1 of full-controlled switch device S7, in the inductance L2 and The collector of full-controlled switch device S1, S3 and S5, the DC bus N connection full-controlled switch are connected between the capacitor C2 The emitter of device S4, S6 and S2, the collection of the emitter of the full-controlled switch device S1 and the full-controlled switch device S4 Electrode is connected to output end a, the current collection of the emitter of the full-controlled switch device S3 and the full-controlled switch device S6 Pole is connected to output end b, the collector of the emitter of the full-controlled switch device S5 and the full-controlled switch device S2 It is connected to output end c.
This unique structure allows the switching tube on same bridge arm instantaneously to lead directly to, and improves the safety of system and reliable Property;In addition, by introducing the straight-through stepping functions for measuring neatly control system, thus also overcome conventional voltage type inverter The shortcomings that can only being depressured;Further, it compared to traditional single stage type, two-stage type inverter, is realized in the form of single-stage power conversion Buck and inversion function.In addition, the electric current for flowing into output stage is continuously constant, Er Qieyou due to the effect of inductance L1 It is acted in partial pressure, the voltage on capacitor C2 wants small, and the voltage stress that device is born is small.
Referring to Fig. 2, the A circuitry phase includes input stage and isolated variable grade, and the input stage uses the more level of cascaded H-bridges Topology is made of 9 H bridging connection module cascades, to reduce the voltage shared on each switching tube;
The isolated variable grade controls energy in bidirectional flow, by 3 unit module cascaded series using more active bridge topologys Be coupled to form at, the unit module by 3 primary side Multiple coils and a secondary side simplex winding, prime respectively with H bridging connection module DC capacitor be connected, rear class composes in parallel DC bus, and anode connects P DC bus, and cathode connects N DC bus;The A phase electricity Line structure and the B circuitry phase structure and the C circuitry phase structure are all the same, and each phase is composed of multiple unit modules, Structure is simple, convenient for extension.
Referring to Fig. 3, the H bridging connection module include four full-controlled switch devices SAi, SAi+1, SAi+2, SAi+3 and Capacitor CAm, the collector of the full-controlled switch device SAi be connected with the collector of the full-controlled switch device SAi+1 and It is connected to the capacitor CAmOne end, the emitter of the full-controlled switch device SAi+2 and the full-controlled switch device SAi + 3 emitter is connected and is both connected to the capacitor CAmThe other end, the emitter of the full-controlled switch device SAi and institute The collector for stating full-controlled switch device SAi+2 is connected to a connecting terminal, the hair of the full-controlled switch device SAi+1 The collector of emitter-base bandgap grading and the full-controlled switch device SAi+3 are connected to a connecting terminal;High pressure industrial frequency AC is converted The levitating type DC for being 9 for quantity, cascaded multilevel structure enable input stage power device with lesser voltage stress and switch Frequency is applied to high-power.
In conclusion electric power electric transformer proposed by the present invention has high-pressure side high voltage, low current and low-pressure side low The characteristics of voltage, high current, reduce transformer and submodule quantity, improves the power density of electric power electric transformer;This During transformation of electrical energy and energy fluctuation, higher level's distribution net side grid entry point electric current THD is sufficiently small for invention, can effectively inhibit Electric power electric transformer gives higher level's power distribution network bring harmonic wave;Electric power electric transformer proposed by the invention has good function Rate tracking performance maintains low-voltage network to stablize, moreover it is possible to participate in the electricity of higher level's power distribution network in the case where guaranteeing power quality Pressure/frequency is adjusted, and has certain inertia and damping.
Disclosed above is only a specific embodiment of the invention, and still, the embodiment of the present invention is not limited to this, is appointed What what those skilled in the art can think variation should all fall into protection scope of the present invention.

Claims (3)

1. a kind of electric power electric transformer with energy storage device characterized by comprising A circuitry phase, B circuitry phase, C circuitry phase With accumulation energy type Quasi-Z source inventer, electric power electric transformer high pressure flanks 10kV power distribution network, connecting terminal A, B, C, described The end y of the end x of A circuitry phase and the B circuitry phase is electrically connected with the end z of the C circuitry phase into common point o, institute It states electric power electric transformer low pressure and flanks 400V grade power distribution network, connecting terminal a, b, c;
Three-phase 10kV alternating voltage divide by the A circuitry phase, the B circuitry phase and the C circuitry phase and change is isolated It changes, High Level AC Voltage is transformed to direct current, be all connected with DC bus P and N, the DC bus P and N are electrically connected accumulation energy type DC power conversion is that three-phase 400V grade alternating current connects low-voltage network by Quasi-Z source inventer;
The A circuitry phase includes input stage and isolated variable grade, and the input stage is made of 9 H bridging connection module cascades, institute It states isolated variable grade to be made of 3 unit module cascades, the unit module is by 3 primary side Multiple coils and a secondary side simplex winding It is coupled to form, the A circuitry phase structure and the B circuitry phase structure and the C circuitry phase structure are all the same.
2. transformer as described in claim 1, which is characterized in that the accumulation energy type Quasi-Z source inventer includes: inductance One end of L1, full-controlled switch device S7 and capacitor C2, the inductance L1 connect DC bus P, the other end of the inductance L1 The emitter for connecting full-controlled switch device S7, after the collector series inductance L2 and capacitor C2 of the full-controlled switch device S7 Connect the emitter of the full-controlled switch device S7, the collector shunt capacitance C1 of the full-controlled switch device S7 and electric power storage DC bus N is connected after the B1 of pond, and full-controlled switch device S1, S3 and S5 are connected between the inductance L2 and the capacitor C2 Collector, the emitter of described DC bus N connection full-controlled switch device S4, S6 and S2, the full-controlled switch device S1 Emitter and the collector of the full-controlled switch device S4 be connected to output end a, the full-controlled switch device S3's The collector of emitter and the full-controlled switch device S6 are connected to output end b, the hair of the full-controlled switch device S5 The collector of emitter-base bandgap grading and the full-controlled switch device S2 are connected to output end c.
3. transformer as described in claim 1, which is characterized in that the H bridging connection module includes four full-controlled switch devices Part SAi, SAi+1, SAi+2, SAi+3 and capacitor CAm, the collector and the full-controlled switch of the full-controlled switch device SAi The collector of device SAi+1 is connected and is both connected to the capacitor CAmOne end, the transmitting of the full-controlled switch device SAi+2 Pole is connected with the emitter of the full-controlled switch device SAi+3 and is both connected to the capacitor CAmThe other end, the full control The collector of the emitter of type switching device SAi and the full-controlled switch device SAi+2 are connected to a connecting terminal, institute The collector of the emitter and the full-controlled switch device SAi+3 of stating full-controlled switch device SAi+1 is connected to one and connects Line terminals.
CN201811185378.8A 2018-10-11 2018-10-11 A kind of electric power electric transformer with energy storage device Pending CN109067195A (en)

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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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WO2022068222A1 (en) * 2020-09-30 2022-04-07 阳光电源股份有限公司 Cascaded power electronic transformer and control method therefor

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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
CN101917017A (en) * 2010-07-21 2010-12-15 北京交通大学 Single-stage step-up/step-down energy storage photovoltaic grid-connected power generation control system
CN102185533A (en) * 2011-05-23 2011-09-14 北京交通大学 Stored energy type standard-Z source photovoltaic power generation control system and method
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Publication number Priority date Publication date Assignee Title
WO2022068222A1 (en) * 2020-09-30 2022-04-07 阳光电源股份有限公司 Cascaded power electronic transformer and control method therefor
EP4224694A4 (en) * 2020-09-30 2024-10-09 Sungrow Power Supply Co., Ltd. CASCADED POWER ELECTRONIC TRANSFORMER AND CONTROL METHODS THEREFOR

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Application publication date: 20181221