CN107370396A - A kind of electric power electric transformer and its voltage-transforming method of tandem mesohigh power network - Google Patents

A kind of electric power electric transformer and its voltage-transforming method of tandem mesohigh power network Download PDF

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Publication number
CN107370396A
CN107370396A CN201710700749.0A CN201710700749A CN107370396A CN 107370396 A CN107370396 A CN 107370396A CN 201710700749 A CN201710700749 A CN 201710700749A CN 107370396 A CN107370396 A CN 107370396A
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voltage
low
converter
pressure stage
level
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Inventor
张晓青
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NANTONG XINYUAN ELECTRIC APPLIANCE MANUFACTURING Co Ltd
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NANTONG XINYUAN ELECTRIC APPLIANCE MANUFACTURING Co Ltd
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Priority to CN201710700749.0A priority Critical patent/CN107370396A/en
Publication of CN107370396A publication Critical patent/CN107370396A/en
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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
    • 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
    • H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—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 with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • 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
    • 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
    • H02M5/4585—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 having a rectifier with controlled elements
    • 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
    • H02M7/5387—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 in a bridge configuration
    • H02M7/53871—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 in a bridge configuration with automatic control of output voltage or current
    • 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
    • H02M1/007—Plural converter units in cascade
    • 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
    • H02M7/4815—Resonant converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

A kind of electric power electric transformer and its voltage-transforming method of tandem mesohigh power network.A kind of electric power electric transformer of tandem mesohigh power network of the present invention is connected and composed by hiigh pressure stage, isolation level and low-pressure stage sequential series, hiigh pressure stage is made up of the modular multi-level converter of high-voltage alternating side, isolation level is made up of M isolated form DC DC converter in parallel, and low-pressure stage is connected in series by the three-phase four-leg inverter of low-pressure side；Wherein, the output voltage positive pole of the modular multi-level converter of high-voltage alternating side connects first previous bridge arm intermediate point of module input side inverter bridge in M isolated form DC DC converter, and the output voltage negative pole of the modular multi-level converter of high-voltage alternating side connects M isolated form DC DC converters last module input capacitance negative terminal；The output voltage positive pole of isolated form DC DC converters connects the input voltage positive pole of the three-phase four-leg inverter of low-pressure stage, the output voltage negative pole of isolated form DC DC converters connects the input voltage negative pole of the three-phase four-leg inverter of low-pressure stage, forms hiigh pressure stage, isolation level connects with low-pressure stage sequential series.

Description

A kind of electric power electric transformer and its voltage-transforming method of tandem mesohigh power network
Technical field
The present invention relates to the design of electric power electric transformer, and in particular to a kind of power electronics of tandem mesohigh power network Transformer, belong to the technical field of electric power electric transformer design.
Background technology
In power transmission, distribution transformer is most important in power distribution network and applies a most common kind equipment, and it is acted on High-tension distribution voltage is usually down to low-voltage output to user.The annual production of China's distribution transformer is up to 50,000,000 KVA or so, account for the 1/3 of the total annual production of transformer.Therefore, the technical performance of distribution transformer and economic indicator all can direct shadows Ring the power quality and intelligence degree of following intelligent grid.However, traditional distribution transformer and the intelligence of intelligent grid Can, compatible, high power supply quality etc. require that there is a big difference.
Therefore, the electric power electric transformer functions such as electrical isolation, voltage transformation, reactive-load compensation to be rolled into one turn into pair Traditional transformer and power electronic equipment carry out integrated optimization, improve the visual plant of grid equipment intelligent level.
A kind of structure of new electric power electric transformer is currently suggested, the transformer is by modular multi-level converter (modular multilevel converter, MMC), intermediate input series connection output-parallel (input series output Parallel, ISOP) isolation type DC-DC converter and three-phase four-leg inverter form.But in this transformer, ISOP Isolation type DC-DC converter system input using the method that electric capacity is directly connected by the method that each module is connected from And the series connection of input is realized, but such a method can cause all derided capacitors one in MMC module output voltage short circuits Short circuit is played so as to which component can be burnt out.
The content of the invention
Technical problem：The present invention is for the problems of prior art, there is provided a kind of electricity of tandem mesohigh power network Power electronic transformer and its voltage-transforming method, solve in MMC module output voltage short circuits that ISOP modules input capacitance also can be simultaneously Generation short circuit burns out device this problem.
Technical scheme：A kind of electric power electric transformer of tandem mesohigh power network of the present invention is by hiigh pressure stage, isolation level Connected and composed with low-pressure stage sequential series, hiigh pressure stage is made up of the modular multi-level converter of high-voltage alternating side, and isolation level is by M Individual isolation type DC-DC converter composition in parallel, low-pressure stage are connected in series by the three-phase four-leg inverter of low-pressure side；Its In, the output voltage positive pole of the modular multi-level converter of high-voltage alternating side connects in M isolation type DC-DC converter first The previous bridge arm intermediate point of module input side inverter bridge, the output voltage negative pole of the modular multi-level converter of high-voltage alternating side connect M isolation type DC-DC converter last module input capacitance negative terminal；The output voltage positive pole of isolation type DC-DC converter Connect the input voltage positive pole of the three-phase four-leg inverter of low-pressure stage, the output voltage negative pole of isolation type DC-DC converter connects low The input voltage negative pole for the three-phase four-leg inverter arbitrarily downgraded, form hiigh pressure stage, isolation level connects with low-pressure stage sequential series.
The isolation type DC-DC converter of the isolation level, wherein, the company of two neighboring isolation type DC-DC converter module The mode of connecing is previous module input capacitance CHNegative terminal is connected to the previous bridge arm intermediate point of inverter bridge of latter module, solves high pressure and hands over Cause isolation type DC-DC converter input capacitance short circuit problem during the modular multi-level converter output short-circuit for flowing side.
The voltage-transforming method of electric power electric transformer of the tandem mesohigh power network of the present invention is：In hiigh pressure stage, the height Press the modular multi-level converter of AC that high pressure survey three-phase alternating voltage is transformed into HVDC udcH；Because high pressure is handed over Flowing power model in the modular multi-level converter of side, to be connected in series, the electric power electric transformer for making this topological is easy to difference The expansion of voltage class；The isolation type DC-DC converter of intermediate isolating level is by the modular multi-level converter of high-voltage alternating side Convert obtained high-voltage dc voltage udcHIt is transformed into low pressure udcL, so that low-pressure stage three-phase inverter uses, meanwhile, intermediate isolating The isolation type DC-DC converter of level also achieves high pressure survey and the electrical isolation function of low-pressure side；And the bridge of three-phase four of low-pressure stage Arm inverter is by low-pressure side DC voltage udcLInversion is the alternating voltage of three-phase and four-line, with for users to use.
Described low-pressure stage, only need single-phase alternating current in low-pressure side or only need direct current, then by the three-phase of low-pressure side Four-leg inverter replaces with the current transformer or DC load of corresponding function.
Beneficial effect：The electric power electric transformer and its voltage-transforming method of the tandem mesohigh power network of the present invention are relative to existing There is technology, have the following advantages that,
1) present invention can be avoided in the case of MMC module output voltage short circuits, the problem of ISOP input capacitance short circuits；
2) ISOP intermodules use the regulative mode of Interleaved control so that input current ripple reduces, and advantageously reduces and is System volume；
3) the technical scheme cost is relatively low, is easy to further popularization and application.
Brief description of the drawings
Fig. 1 is the main circuit schematic diagram of the electric power electric transformer of the tandem mesohigh power network of the present invention；
Fig. 2 is high-voltage alternating side MMC control strategy；
Fig. 3 is the control strategy of low-pressure side three-phase four-leg inverter.
Embodiment
The present invention is further described below in conjunction with the accompanying drawings.
The transformer is connected and composed by hiigh pressure stage, isolation level and low-pressure stage sequential series, and hiigh pressure stage is by high-voltage alternating side Modular multi-level converter is formed, and isolation level is made up of M isolation type DC-DC converter in parallel, and low-pressure stage is by low-pressure side Three-phase four-leg inverter be connected in series；Wherein, the output voltage of the modular multi-level converter of high-voltage alternating side Positive pole connects first previous bridge arm intermediate point of module input side inverter bridge in M isolation type DC-DC converter, high-voltage alternating side The output voltage negative pole of modular multi-level converter connects M isolation type DC-DC converter last module input capacitance and born End；The output voltage positive pole of isolation type DC-DC converter connects the input voltage positive pole of the three-phase four-leg inverter of low-pressure stage, every The output voltage negative pole of release DC-DC converter connects the input voltage negative pole of the three-phase four-leg inverter of low-pressure stage, is formed high Arbitrarily downgrade, isolation level connects with low-pressure stage sequential series.The isolation type DC-DC converter of the isolation level, wherein, it is two neighboring every The connected mode of release DC-DC convertor module is previous module input capacitance CHBefore negative terminal is connected to the inverter bridge of latter module One bridge arm intermediate point, isolated form DC-DC is caused to convert during the modular multi-level converter output short-circuit for solving high-voltage alternating side Device input capacitance short circuit problem.
On the basis of above-mentioned electric power electric transformer, it is further explained：
MMC effect is that high pressure survey three-phase alternating voltage is changing into HVDC udcH.Because power model is in MMC It is connected in series, this just determines that this topological electric power electric transformer PET is easy to the expansion of different voltage class.Middle ISOP Isolation type DC-DC converter major function is that MMC is converted into obtained high-voltage dc voltage udcHIt is transformed into low pressure udcL, with power supply Pressure is surveyed three-phase inverter and used.Meanwhile middle DC-DC converter also achieves high pressure survey and the electrical isolation work(of low-pressure side Energy.And the three-phase four-leg inverter major function of low-pressure side is by low-pressure side DC voltage udcLInversion is the friendship of three-phase and four-line Voltage is flowed, with for users to use.If low-pressure side only needs single-phase alternating current or only needs direct current, can be by low-pressure side Three-phase four-leg inverter replaces with the current transformer or DC load of corresponding function.
Control strategy used in three modules is specifically analyzed separately below.
1st, high-voltage alternating side MMC control strategy
The present invention is using the vector control strategy based on grid voltage orientation, and in dq coordinate systems, i.e. synchronous rotary is sat Mark system is lower to implement control strategy.General frame is as shown in Fig. 2 wherein, outer shroud is high-voltage dc voltage control ring, and inner ring is power network Current regulator.In addition, to reduce d axles and q shaft currents influencing each other in dynamic process, electric current loop also adds decoupling ring Section.In Fig. 2, udcH *For udcHReference value；igq *For igqReference value；edFor the d axis components of line voltage；eqFor line voltage Q axis components；igdFor the d axis components of power network current；igqFor the q axis components of power network current.In MMC controls, outer shroud and inner ring are equal Adoption rate integrates (proportional integral, PI) adjuster.Further, since grid side power factor is 1, so The reactive current i of High-voltage AC Network hereingqSet-point be zero.
2nd, the control strategy of ISOP isolation type DC-DC converters
The dual H-bridge that the DC-DC converter of middle multiple isolated forms has series resonance is formed, and its power can be with bidirectional flow It is dynamic.As a result of input series connection, the connected mode of output-parallel, each converter that high pressure is surveyed can be by being connected in parallel Low-pressure side positive energy exchange.It can thus realize that high pressure surveys electric capacity CHWith low pressure lateral capacitance CLThe automatic equalization of upper DC voltage.This Outside, series resonant circuit is employed, it is possible to achieve all IGBT are in ZCS on off states, therefore can reduce system loss.Separately Outside, due to input series system and indirect series connection, but previous module input capacitance negative terminal is connected to the inverse of latter module Become the previous bridge arm intermediate point of bridge, the problem of effectively avoiding the input capacitance dead short in upper level voltage short circuit.Such a Under topology, due to the control mode for being 50% using dutycycle perseverance, so the voltage that input capacitance both ends are born is each Module bears 2 times of average voltage.
DC-DC converter is by the way of opened loop control, i.e., the high pressure of transformer is surveyed and low-pressure side voltage is dutycycle 50% square wave, and phase is identical.I.e. the modulation system of the H bridges of high voltage side of transformer and low-pressure side is bipolar modulation.
3rd, the control strategy of low-pressure side three-phase four-leg inverter
There are 4 bridge arms (a, b, c, n) in low-pressure side three-phase four-leg inverter, the voltage of n bridge arms is unrelated with load current, So the output voltage of a, b, c three-phase can be used as 3 single-phase inverter independent controls.Double closed using traditional herein Ring control strategy.I.e. outer shroud Voltage loop adds inner ring inductive current control ring.Wherein, the adjuster of outer shroud is ratio resonance (proportional resonant, PR) controller, the adjuster of inner ring is ratio (proportional, P) adjuster.

Claims (4)

  1. A kind of 1. electric power electric transformer of tandem mesohigh power network, it is characterised in that：The transformer is by hiigh pressure stage, isolation level Connected and composed with low-pressure stage sequential series, hiigh pressure stage is made up of the modular multi-level converter of high-voltage alternating side, and isolation level is by M Individual isolation type DC-DC converter composition in parallel, low-pressure stage are connected in series by the three-phase four-leg inverter of low-pressure side；Its In, the output voltage positive pole of the modular multi-level converter of high-voltage alternating side connects in M isolation type DC-DC converter first The previous bridge arm intermediate point of module input side inverter bridge, the output voltage negative pole of the modular multi-level converter of high-voltage alternating side connect M isolation type DC-DC converter last module input capacitance negative terminal；The output voltage positive pole of isolation type DC-DC converter Connect the input voltage positive pole of the three-phase four-leg inverter of low-pressure stage, the output voltage negative pole of isolation type DC-DC converter connects low The input voltage negative pole for the three-phase four-leg inverter arbitrarily downgraded, form hiigh pressure stage, isolation level connects with low-pressure stage sequential series.
  2. 2. the electric power electric transformer of tandem mesohigh power network according to claim 1, it is characterised in that：The isolation The isolation type DC-DC converter of level, wherein, the connected mode of two neighboring isolation type DC-DC converter module is previous module Input capacitance CHNegative terminal is connected to the previous bridge arm intermediate point of inverter bridge of latter module, solves the modular multilevel of high-voltage alternating side Cause isolation type DC-DC converter input capacitance short circuit problem during current transformer output short-circuit.
  3. 3. a kind of voltage-transforming method of the electric power electric transformer of tandem mesohigh power network as claimed in claim 1, its feature It is：In hiigh pressure stage, high pressure survey three-phase alternating voltage is transformed into height by the modular multi-level converter of the high-voltage alternating side Straightening streamu dcH；Because power model to be connected in series, makes this topological electricity in the modular multi-level converter of high-voltage alternating side Power electronic transformer is easy to the expansion of different voltage class；The isolation type DC-DC converter of intermediate isolating level is by high-voltage alternating side Modular multi-level converter convert obtained high-voltage dc voltageu dcHIt is transformed into low pressureu dcL, for low-pressure stage three-phase inversion Device uses, meanwhile, the isolation type DC-DC converter of intermediate isolating level also achieves high pressure survey and the electrical isolation work(of low-pressure side Energy；And the three-phase four-leg inverter of low-pressure stage is by low-pressure side DC voltageu dcLInversion is the alternating voltage of three-phase and four-line, for User uses.
  4. 4. the voltage-transforming method of the electric power electric transformer of tandem mesohigh power network according to claim 3, its feature exist In：Described low-pressure stage, only need single-phase alternating current in low-pressure side or only need direct current, then by the three-phase four-arm of low-pressure side Inverter replaces with the current transformer or DC load of corresponding function.
CN201710700749.0A 2017-08-16 2017-08-16 A kind of electric power electric transformer and its voltage-transforming method of tandem mesohigh power network Pending CN107370396A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107947221A (en) * 2017-12-23 2018-04-20 西安许继电力电子技术有限公司 A kind of electric power electric transformer DC Line Fault traversing method
CN112350609A (en) * 2020-12-07 2021-02-09 哈尔滨理工大学 Delta rectifier design related to energy router topological structure

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CN103956911A (en) * 2014-05-05 2014-07-30 国家电网公司 Modularized H-bridge cascade multilevel mutual-balance power electronic transformer
CN107370392A (en) * 2017-07-05 2017-11-21 东南大学 Towards the electric power electric transformer of mesohigh intelligent distribution network

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103956911A (en) * 2014-05-05 2014-07-30 国家电网公司 Modularized H-bridge cascade multilevel mutual-balance power electronic transformer
CN107370392A (en) * 2017-07-05 2017-11-21 东南大学 Towards the electric power electric transformer of mesohigh intelligent distribution network

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107947221A (en) * 2017-12-23 2018-04-20 西安许继电力电子技术有限公司 A kind of electric power electric transformer DC Line Fault traversing method
CN107947221B (en) * 2017-12-23 2021-04-06 西安许继电力电子技术有限公司 Power electronic transformer direct-current fault ride-through method
CN112350609A (en) * 2020-12-07 2021-02-09 哈尔滨理工大学 Delta rectifier design related to energy router topological structure

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Application publication date: 20171121