CN202275142U - Back-to-back test device of a flexible direct-current transmission MMC valve steady-state operation test - Google Patents

Back-to-back test device of a flexible direct-current transmission MMC valve steady-state operation test Download PDF

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Publication number
CN202275142U
CN202275142U CN2011203107712U CN201120310771U CN202275142U CN 202275142 U CN202275142 U CN 202275142U CN 2011203107712 U CN2011203107712 U CN 2011203107712U CN 201120310771 U CN201120310771 U CN 201120310771U CN 202275142 U CN202275142 U CN 202275142U
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China
Prior art keywords
reactance
module
igbt
valve module
valve
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Expired - Lifetime
Application number
CN2011203107712U
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Chinese (zh)
Inventor
罗湘
吴亚楠
查鲲鹏
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State Grid Corp of China SGCC
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China Electric Power Research Institute Co Ltd CEPRI
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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
    • 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
    • H02M7/483Converters with outputs that each can have more than two voltages levels
    • H02M7/4835Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage

Abstract

The utility model relates to a back-to-back test device of a flexible direct-current transmission MMC valve steady-state operation test, comprising a rectification side, an inversion side and a support capacitor, wherein the rectification side and the inversion side are respectively connected with two sides of the support capacitor in parallel to form a back-to-back circuit, an input end of the rectification side and an output end of the inversion side are accessed to a same power source. The rectification side and the inversion side share one power source and the power from the power source returns to the power source in a certain control way, the requirement for the capacitance of the power source is reduced to the maximum extent. The valve assembly is taken from a practical project, the test circuit operating principle and control strategy and the MMC in the practical project have very high similarity and the necessary, effective valve operation reliability investigation means and the control strategy are provided to verify the environment before the MMC is put into the practical application.

Description

The back-to-back testing device of flexible DC power transmission MMC valve Tests at Steady State
Technical field:
The utility model belongs to flexible DC power transmission and power electronics applied technical field, is specifically related to the back-to-back testing device of flexible DC power transmission MMC valve Tests at Steady State.
Background technology:
Along with the progressively application of flexible DC power transmission (VSC-HVDC) technology in electric system, the reliability of its core component---high-power insulated gate bipolar transistor (IGBT) valve becomes one of key factor of power system security.Based on the VSC-HVDC of modularization multi-level converter (MMC), be to utilize the IGBT valve to carry out a kind of new technology of direct current transportation.Submodule (SM) is the minimum power unit that constitutes MMC, and the half-bridge that it is made up of IGBT (perhaps H bridge) composes in parallel with capacitor.Experimental process module series connection constitutes a MMC valve module, and the electrical specification that it can proportional embodiment MMC valve is the basic electric unit that carries out MMC valve Tests at Steady State.MMC valve Tests at Steady State is in order to investigate MMC valve tolerance to critical stress such as maximum current, voltage and temperature under long-term actual operating mode, with the correctness of checking MMC valve design.
Because the VSC-HVDC device generally has high voltage, heavy current, jumbo characteristics, cause in experimental enviroment, being difficult to make up the full live road identical and make an experiment with actual operating mode.Therefore, how in experimental enviroment, to make up the hookup of equivalence, carry out the test suitable and become the key of dealing with problems with actual operating mode intensity.
The utility model content:
The utility model provides a kind of back-to-back testing device that is used for flexible DC power transmission MMC valve Tests at Steady State, and this test unit is implemented in by equivalence on the examination valve module and reproduces working voltage, electric current and hot strength under the actual condition.And this apparatus structure is simple, flexible, and the parameter regulation mode is easy, can satisfy the requirement of MMC valve module Tests at Steady State.
The back-to-back testing device of the flexible DC power transmission MMC valve Tests at Steady State that the utility model provides, its improvements are that said back-to-back testing circuit comprises valve module (1,2,3,4), reactance (L 11, L 12, L 21, L 22), load reactance (L 1, L 2), support electric capacity (C DC1, C DC2) and AC power U S
Said valve module (1,2) is respectively through corresponding said reactance (L 11, L 12) be connected to ac output end A, constitute the rectification side; Said valve module (3,4) is respectively through corresponding said reactance (L 21, L 22) be connected to ac output end B, constitute the inversion side; Said ac output end A and said ac output end B and same AC power U SConnect;
Said rectification side and said inversion side are parallel to said support capacitor C respectively DC1And C DC2The series arm both sides, form device back-to-back.
The back-to-back testing device of first preferred version that the utility model provides, its improvements are, said support capacitor C DC1With said support capacitor C DC2Series connection; Said support capacitor C DC1With said support capacitor C DC2Series connection node ground connection.
The back-to-back testing device of second preferred version that the utility model provides, its improvements are that said valve module (1,2,3,4) includes the submodule of n series connection; Said submodule is composed in parallel by half-bridge structure and submodule capacitor; Or said submodule is composed in parallel by H bridge construction and submodule capacitor; Said submodule capacitor is C SMn
Said half-bridge structure or H bridge construction include K switch n, thyristor T n, IGBT device (T N1, T N2) and diode D N1And D N2
Said IGBT device T N1Inverse parallel diode D N1Form IGBT module 1; Said IGBT device T N2Inverse parallel diode D N2Form IGBT module 2; Said IGBT module 1 and 2 series connection of IGBT module are formed IGBT module 1 and IGBT module 2 series arms;
Said IGBT module 2, thyristor T nAnd K switch nParallel connection successively.
The back-to-back testing device of the 3rd preferred version that the utility model provides, its improvements are, said ac output end I and said AC power U SBetween string said load reactance L arranged 1
The back-to-back testing device of the 4th preferred version that the utility model provides, its improvements are, said ac output end II and said AC power U SBetween string said load reactance L arranged 2
The back-to-back testing device of the more preferably scheme that the utility model provides, its improvements are that said submodule comprises resistance R n, said resistance R nParallelly connected with IGBT module 1 and IGBT module 2 series arms.
With the prior art ratio, the beneficial effect of the utility model is:
1, the rectification side and the shared power supply of inversion side of the test unit that provides of the utility model; Pass through certain control method; The meritorious power supply itself of getting back to that power supply is sent; Power supply only need provide the various losses of whole device valve and the loss of load to get final product, and has at utmost reduced the requirement to power supply capacity;
2, the modulation system that test unit adopted that provides of the utility model not only can produce the many level sine ladder wave voltage with actual engineering equivalence, and compares with traditional pulse width modulation mode and to greatly reduce switching frequency, has reduced switching loss;
3, the test unit that provides of the utility model can obtain the current stress of accurate AC and DC stack through certain meritorious, idle control strategy, not only regulative mode flexibly, simple, and have higher equivalence with actual engineering;
4, the valve module in the test unit that provides of the utility model is taken from actual engineering; And the MMC in device operation logic and control strategy and the actual engineering has very high similarity, and this provided necessary, effective valve operational reliability investigation means and control strategy verification environment for MMC before dropping into practical application.
Description of drawings
The MMC of the formula back-to-back valve module Tests at Steady State device topological diagram that Fig. 1 provides for the utility model.
The MMC valve section Tests at Steady State bridge arm voltage waveform synoptic diagram that Fig. 2 provides for the utility model.
The MMC valve section Tests at Steady State brachium pontis current waveform synoptic diagram that Fig. 3 provides for the utility model.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the utility model is done further to specify.
Fig. 1 is a formula MMC valve module Tests at Steady State device topological diagram back-to-back.The back-to-back testing device comprises valve module 1, valve module 2, valve module 3, valve module 4, reactance L 11, reactance L 12, reactance L 21, reactance L 22, load reactance L 1, load reactance L 2, support capacitor C DC1, support capacitor C DC2With AC power U 2Valve module 1 is through reactance L 11Be connected to ac output end A, valve module 2 is through reactance L 12Also be connected to ac output end A, constitute the rectification side.Valve module 3 is through reactance L 21Be connected to ac output end B, valve module 4 is through reactance L 22Be connected to ac output end B, constitute the inversion side.Capacitor C is supported in rectification side and the parallel connection of inversion side DC1And C DC2Be parallel to after the series connection between rectification side and the inversion side, and support capacitor C DC1With said support capacitor C DC2Series connection node ground connection.Like this, rectification side, support electric capacity and inversion side constitute the back-to-back testing device.
Ac output end A and the ac output end B load reactance L that connects respectively 1With load reactance L 2After be connected to same AC power U SThe same side;
The valve module 1,2,3 and 4 of present embodiment includes the submodule of n (n depends on the number of the contained submodule of valve module in the actual engineering, and different engineering n is different) series connection; Submodule is composed in parallel by half-bridge structure and submodule capacitor; Or said submodule is composed in parallel by H bridge construction and submodule capacitor; Said submodule capacitor is C SMn
Said half-bridge structure or H bridge construction include K switch n, thyristor T n, resistance R n, IGBT device (T N1, T N2) and diode D N1And D N2
Said IGBT device T N1Inverse parallel diode D N1Form IGBT module 1; Said IGBT device T N2Inverse parallel diode D N2Form IGBT module 2; Said IGBT module 1 and 2 series connection of IGBT module are formed IGBT module 1 and IGBT module 2 series arms;
Said IGBT module 2, thyristor T nAnd K switch nParallel connection successively, resistance R nParallelly connected with IGBT module 1 and IGBT module 2 series arms.
The test method that the test unit of present embodiment is corresponding comprises the steps:
(1) sets submodule capacitance voltage U SM, DC voltage U DC, active power P, reactive power Q;
(2) closed disconnector K starts charge mode, makes U STo all submodule capacitor chargings.After condenser voltage reaches setting value, withdraw from charge mode;
(3) start operational mode, send submodule IGBT trigger pulse, circuit gets into the steady-state operation state.Two facies units are made rectification and inverter operation respectively, and submodule capacitor and brachium pontis reactor carry out energy exchange to make and produce the required current stress of test in the valve module, and sets up test required voltage stress at the valve module two ends.
(4) break off disconnector K, withdraw from U S, locking IGBT trigger pulse, off-test.
The Tests at Steady State circuit is intended to produce on the valve module two kinds of stress: the one, and many level sine ladder wave voltage stress of adjustable band direct current biasing, the 2nd, the sine-wave current stress of adjustable band direct current biasing.During the circuit steady-state operation, during the circuit steady-state operation, the IGBT in 4 valve modules is operated under the lower sine ladder wave modulation system of switching frequency, and two ends will obtain sine ladder wave as shown in Figure 2, and direct current biasing does Regulate active power P and Q that rectification side and inversion side are exchanged, can change the DC component I of current i in the valve module respectively DcWith AC compounent I AcSize, its waveform synoptic diagram is as shown in Figure 3.
Should be noted that at last: combine the foregoing description only explain the utility model technical scheme but not to its restriction.Under the those of ordinary skill in field be to be understood that: those skilled in the art can make amendment or are equal to replacement the embodiment of the utility model, but these modifications or change are all among the claim protection domain that application is awaited the reply.

Claims (6)

1. the back-to-back testing device of flexible DC power transmission MMC valve Tests at Steady State is characterized in that, said back-to-back testing circuit comprises valve module 1, valve module 2, valve module 3, valve module 4, reactance L 11, reactance L 12, reactance L 21, reactance L 22, load reactance L 1, load reactance L 2, support capacitor C DC1, support capacitor C DC2With AC power U S
Said valve module 1, said valve module 2 are respectively through corresponding said reactance L 11, said reactance L 12Be connected to ac output end A, constitute the rectification side; Said valve module 3, said valve module 4 are respectively through corresponding said reactance L 21, said reactance L 22Be connected to ac output end B, constitute the inversion side; Said ac output end A and said ac output end B and said AC power U SConnect;
Said rectification side and said inversion side are parallel to said support capacitor C respectively DC1And C DC2The series arm both sides.
2. back-to-back testing device as claimed in claim 1 is characterized in that, said support capacitor C DC1With said support capacitor C DC2Series connection; Said support capacitor C DC1With said support capacitor C DC2Series connection node ground connection.
3. back-to-back testing device as claimed in claim 1 is characterized in that, said valve module 1, said valve module 2, said valve module 3, said valve module 4 include the submodule of n series connection; Said submodule is composed in parallel by half-bridge structure and submodule capacitor; Or said submodule is composed in parallel by H bridge construction and submodule capacitor; Said submodule capacitor is C SMn
Said half-bridge structure or H bridge construction include K switch n, thyristor T n, IGBT device T N1, IGBT device T N2And diode D N1And D N2
Said IGBT device T N1Inverse parallel diode D N1Form IGBT module 1; Said IGBT device T N2Inverse parallel diode D N2Form IGBT module 2; Said IGBT module 1 and 2 series connection of IGBT module are formed IGBT module 1 and IGBT module 2 series arms;
Said IGBT module 2, thyristor T nAnd K switch nParallel connection successively.
4. back-to-back testing device as claimed in claim 1 is characterized in that, said ac output end I and said AC power U SBetween string said load reactance L arranged 1
5. back-to-back testing device as claimed in claim 1 is characterized in that, said ac output end II and said AC power U SBetween string said load reactance L arranged 2
6. back-to-back testing device as claimed in claim 3 is characterized in that said submodule comprises resistance R n, said resistance R nParallelly connected with IGBT module 1 and IGBT module 2 series arms.
CN2011203107712U 2011-08-25 2011-08-25 Back-to-back test device of a flexible direct-current transmission MMC valve steady-state operation test Expired - Lifetime CN202275142U (en)

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102890209A (en) * 2012-09-25 2013-01-23 许继集团有限公司 Continuous current operation testing device of multi-level converter half-bridge type sub-module
CN102944768A (en) * 2012-09-25 2013-02-27 许继集团有限公司 Continuous current running test method for half-bridge sub-modules of multilevel converter
CN103018586A (en) * 2012-11-20 2013-04-03 中国科学院电工研究所 Test device and test method for modularized multi-level current transformer sub-module
CN103050967A (en) * 2013-01-06 2013-04-17 华北电力大学(保定) Active disturbance control method of flexible direct current power transmission system
CN103197241A (en) * 2013-03-20 2013-07-10 许继集团有限公司 Testing device and testing method of flexible direct-current transmission modular multilevel converter (MMC) converter valve operating
CN103809114A (en) * 2014-01-21 2014-05-21 清华大学 Power hedge testing apparatus for converter valves of modularized multi-level converter
CN103837827A (en) * 2014-03-22 2014-06-04 中国科学院电工研究所 Fault operation test device of flexible direct current transmission valve
CN103901257A (en) * 2014-03-04 2014-07-02 国家电网公司 Modularization multi-level current converter bridge arm current direction measuring device and judgment method
WO2016034232A1 (en) * 2014-09-04 2016-03-10 Siemens Aktiengesellschaft Test circuit for a modular multi-cell converter
CN106546852A (en) * 2016-11-01 2017-03-29 全球能源互联网研究院 A kind of MMC converter valves Tests at Steady State circuit and its control method
CN108146297A (en) * 2017-12-30 2018-06-12 中铁第四勘察设计院集团有限公司 A kind of electric railway ground electricity split-phase uninterruptible power supply system
CN108306520A (en) * 2017-12-30 2018-07-20 中国船舶重工集团公司第七〇二研究所 A kind of converter plant of electric railway ground automatic neutral-section passing system
CN108616143A (en) * 2018-05-15 2018-10-02 华北电力大学 Consider that the flexible multimode of voltage load shared mechanism switchs Reliability Modeling
WO2021213284A1 (en) * 2020-04-20 2021-10-28 南京南瑞继保电气有限公司 Experiment device for power electronic module and control method therefor

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102944768A (en) * 2012-09-25 2013-02-27 许继集团有限公司 Continuous current running test method for half-bridge sub-modules of multilevel converter
CN102890209A (en) * 2012-09-25 2013-01-23 许继集团有限公司 Continuous current operation testing device of multi-level converter half-bridge type sub-module
CN102890209B (en) * 2012-09-25 2015-07-22 许继电气股份有限公司 Continuous current operation testing device of multi-level converter half-bridge type sub-module
CN102944768B (en) * 2012-09-25 2015-03-04 许继电气股份有限公司 Continuous current running test method for half-bridge sub-modules of multilevel converter
CN103018586B (en) * 2012-11-20 2015-04-22 中国科学院电工研究所 Test device and test method for modularized multi-level current transformer sub-module
CN103018586A (en) * 2012-11-20 2013-04-03 中国科学院电工研究所 Test device and test method for modularized multi-level current transformer sub-module
CN103050967A (en) * 2013-01-06 2013-04-17 华北电力大学(保定) Active disturbance control method of flexible direct current power transmission system
CN103050967B (en) * 2013-01-06 2014-09-17 华北电力大学(保定) Active disturbance control method of flexible direct current power transmission system
CN103197241A (en) * 2013-03-20 2013-07-10 许继集团有限公司 Testing device and testing method of flexible direct-current transmission modular multilevel converter (MMC) converter valve operating
CN103197241B (en) * 2013-03-20 2015-11-18 许继电气股份有限公司 Flexible DC power transmission MMC converter valve operating test device and test method
CN103809114A (en) * 2014-01-21 2014-05-21 清华大学 Power hedge testing apparatus for converter valves of modularized multi-level converter
CN103809114B (en) * 2014-01-21 2017-01-04 清华大学 The power of a kind of modularization multi-level converter converter valve liquidates assay device
CN103901257A (en) * 2014-03-04 2014-07-02 国家电网公司 Modularization multi-level current converter bridge arm current direction measuring device and judgment method
CN103901257B (en) * 2014-03-04 2016-08-17 国家电网公司 Multi-level inverter bridge arm sense of current measurement apparatus and determination methods
CN103837827A (en) * 2014-03-22 2014-06-04 中国科学院电工研究所 Fault operation test device of flexible direct current transmission valve
CN103837827B (en) * 2014-03-22 2017-01-18 中国科学院电工研究所 Fault operation test device of flexible direct current transmission valve
WO2016034232A1 (en) * 2014-09-04 2016-03-10 Siemens Aktiengesellschaft Test circuit for a modular multi-cell converter
CN106546852A (en) * 2016-11-01 2017-03-29 全球能源互联网研究院 A kind of MMC converter valves Tests at Steady State circuit and its control method
CN108146297A (en) * 2017-12-30 2018-06-12 中铁第四勘察设计院集团有限公司 A kind of electric railway ground electricity split-phase uninterruptible power supply system
CN108306520A (en) * 2017-12-30 2018-07-20 中国船舶重工集团公司第七〇二研究所 A kind of converter plant of electric railway ground automatic neutral-section passing system
CN108616143A (en) * 2018-05-15 2018-10-02 华北电力大学 Consider that the flexible multimode of voltage load shared mechanism switchs Reliability Modeling
CN108616143B (en) * 2018-05-15 2021-02-12 华北电力大学 Flexible multi-state switch reliability modeling method considering voltage load sharing mechanism
WO2021213284A1 (en) * 2020-04-20 2021-10-28 南京南瑞继保电气有限公司 Experiment device for power electronic module and control method therefor

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