CN102983735A - Pre-charge system and method for capacitor of modular multi-level matrix converter - Google Patents
Pre-charge system and method for capacitor of modular multi-level matrix converter Download PDFInfo
- Publication number
- CN102983735A CN102983735A CN2012105628249A CN201210562824A CN102983735A CN 102983735 A CN102983735 A CN 102983735A CN 2012105628249 A CN2012105628249 A CN 2012105628249A CN 201210562824 A CN201210562824 A CN 201210562824A CN 102983735 A CN102983735 A CN 102983735A
- Authority
- CN
- China
- Prior art keywords
- matrix converter
- group
- bridge
- modular multilevel
- submodule
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Inverter Devices (AREA)
Abstract
The invention relates to a pre-charge system and a method for a capacitor of a modular multi-level matrix converter (M<3>C). The pre-charge system and the system achieves pre-charge of the capacitor of the M<3>C and system starting of the M<3>C and have the advantages that pre-charge time of the capacitor is greatly shortened, power loss of a current limiting resistor is reduced and the control is simple. The pre-charge system comprises the M<3>C; an input end of the M<3>C is connected with a series starting current limiting resistor R, a by-pass switch K1, a breaker K2 and an alternating current power supply in sequence; and an output end of the M<3>C is overhung. The pre-charge method comprises the steps that H bridge sub-modules of the M<3>C are divided into two groups, and the capacitor is pre-charged by group.
Description
Technical field
The present invention relates to a kind of modular multilevel matrix converter electric capacity pre-charge system and method.
Background technology
Modular multilevel matrix converter (Modular Multilevel Matrix Converter, MMMC or M
3C) topology adopts tandem type, modularization, matrix type structure, need not the stepped-up voltage that the direct series connection of power device just can obtain many level, has lower dU/dt and lower voltage harmonic content, adopt the ac-ac conversion technology, in/have broad application prospects in the high-voltage large-capacity frequency conversion system.Be illustrated in figure 1 as 3x3 type three-phase CM
3C converter topology structure, among the figure, link to each other by 9 matrix units respectively between the three-phase I/O, each matrix unit is by N submodule (Sub-modular, SM) and the inductance cascade form, as shown in Figure 1a, each submodule SM is the H bridge construction, shown in Fig. 1 b, the submodule DC side parallel has identical capacitor C.Publication number is the Chinese patent of CN102545644A disclosed " the high voltage converter topological structure is handed over-handed over to a kind of matrix form ", proposes a kind of M with Three Phase Sparse Matrix structure
3C and 3 * 2,2 * 3 and 2 * 2 type M
3C-structure.
When system normally moves, above-mentioned M
3Each submodule capacitance voltage of C need to be stabilized near its rated voltage, therefore, before the normal operation of system, must carry out precharge to submodule SM capacitor C, capacitance voltage is reached or near its rated voltage.
The existing disclosed submodule electric capacity of document pre-charge method all is for modular multilevel converter (MMC), as mentioned at " novel many level VSC submodule capacitance parameter with all press strategy " literary composition (author's fourth champion etc.) of " Proceedings of the CSEE " the 29th volume in 2009 the 30th phase 1-6 page or leaf publication plant concise and to the point utilize accessory power supply it encourage charging modes; Be the Chinese patent disclosed " need not the two-phase modularization multi-level converter starting method of auxiliary DC power supply " of CN101795057A such as publication number, a kind of need not in the situation of auxiliary DC power supply proposed, the self-excitation of three-phase modular multilevel inverter charging force method; Be the Chinese patent of the CN102170140A disclosed starting method of system " a kind of modularization multi-level converter flexible DC power transmission " such as publication number, proposed a kind of MMC starting method for flexible DC power transmission.And this MMC topological structure is a kind of ac-dc-ac transform device structure, with M
3The C A-A transducer has essential distinction, and therefore existing MMC electric capacity pre-charge method is not suitable for M
3The C system.
Summary of the invention
Purpose of the present invention is exactly in order to address the above problem, and a kind of modular multilevel matrix converter electric capacity pre-charge system and method are provided, and has solved M
3Electric capacity precharge and the M of C
3C system starting problem, it has greatly shortens electric capacity precharge time, reduces the current-limiting resistance power loss and controls simple advantage.
To achieve these goals, the present invention adopts following technical scheme:
A kind of modular multilevel matrix converter electric capacity pre-charge system, it comprises modular multilevel matrix converter M
3C, described modular multilevel matrix converter M
3The input of C is connected described modular multilevel matrix converter M with series connection starting current-limiting resistance R, by-pass switch K1 and circuit breaker K2 successively with AC power
3The output of C is unsettled.
A kind of grouping pre-charge method of modular multilevel matrix converter electric capacity pre-charge system, concrete steps are:
Step 1: with modular multilevel matrix converter M
3H bridge submodule among the C in each matrix unit is divided into two groups, wherein N/2 H bridge of first H bridge submodule to the submodule in each matrix unit is divided into first group, when N is odd number, adopt the method that rounds up to round processing, all the other the H bridge submodules in each matrix unit are divided into second group;
Step 2: switching tube Sa1, Sa2, Sb1 and the Sb2 of all H bridge submodules of locking, bypass switch opens K1, closed AC power and circuit breaker K2, system at first enters does not control the rectification pre-charging stage;
Step 3: after capacitor charging makes the control power work of all H bridge submodule SM switching tubes normal, change the grouping pre-charging stage over to;
Step 4: trigger described modular multilevel matrix converter M by control
3The a of two groups of H bridge submodules of C, lower switching tube Sa2 and the Sb2 of b brachium pontis realize grouping precharge;
Step 5: closes bypass switch K1 implements bypass to current-limiting resistance R, and system withdraws from the electric capacity pre-charge state.
Described pre-charge method is: trigger described modular multilevel matrix converter M
3Lower switching tube Sa2 and the Sb2 conducting of second group of H bridge submodule of C trigger described modular multilevel matrix converter M
3Lower switching tube Sa2 or the Sb2 conducting of first group of H bridge submodule of C, system is to M
3First group of H bridge submodule capacitor charging of C worked as M
3When first group of H bridge of C submodule capacitance voltage reached its set point, first group of charging was complete, at this moment lock modules multilevel matrix converter M
3Lower switching tube Sb2 or the Sa2 of second group of H bridge of C submodule, trigger mode blocking multilevel matrix converter M
3Lower switching tube Sa2 and the Sb2 conducting of first group of H bridge submodule of C, system is to modular multilevel matrix converter M
3Second group of H bridge submodule capacitor charging of C is as modular multilevel matrix converter M
3When second group of H bridge of C submodule capacitance voltage reaches its set point, second group also charge complete, lock modules multilevel matrix converter M
3All switching tubes of C, modular multilevel matrix converter M
3All H bridge submodule electric capacity precharge of C finish.
In the described step 4, to modular multilevel matrix converter M
3The capacitor charging of each group order can be exchanged among the C.
Beneficial effect of the present invention:
(1) adopts grouping precharge, no matter converter has several phases, also no matter what H bridge submodules are matrix unit contain, for modular multilevel matrix converter M
3The H bridge submodule of C only is divided into two groups, has greatly shortened the charging interval;
(2) the inventive method, therefore voltage drop greatly reduces the power of current-limiting resistance much smaller than each voltage drop during only to single submodule charging on current-limiting resistance;
(3) do not need the charging current direction is detected, control is simple;
(4) do not need to drop into the capacitance voltage closed-loop control, it is convenient to realize;
(5) H bridge submodule control power supply can be got and can be powered by a capacitance voltage high position, does not need the external control power supply.
Description of drawings
Fig. 1 is 3 * 3 pattern blocking multilevel matrix converter M
3C topological structure schematic diagram;
Fig. 1 a is the matrix unit circuit structure diagram of Fig. 1;
Fig. 1 b is the H bridge submodular circuits schematic diagram of Fig. 1;
Fig. 2 is modular multilevel matrix converter M of the present invention
3C electric capacity precharge H bridge submodule grouping schematic diagram;
Fig. 3 is modular multilevel matrix converter M of the present invention
3C electric capacity precharge main circuit connection layout;
Fig. 4 is electric capacity grouping precharge flow chart of the present invention;
Fig. 5 is electric capacity grouping pre-charge voltage curve chart of the present invention.
Wherein, 1. modular multilevel matrix converter M
3C, 2. modular multilevel matrix converter M
3The matrix unit of C, 3.H bridge submodule, 4. current-limiting resistance R, 5. by-pass switch K1,6. circuit breaker K2,7. AC power.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and embodiment.
As shown in Figure 1, a kind of 3 * 3 modular multilevel matrix converter M have been provided
3C topological structure schematic diagram wherein, has 9 matrix units, and each matrix unit is in series by N H bridge submodule 3SM and reactor L; Fig. 1 a has provided the structure chart of matrix unit, Fig. 1 b has provided the topology diagram of H bridge submodule 3, formed by a and two brachium pontis of b, the a brachium pontis is composed in series by two power switch pipes with anti-paralleled diode of up/down (Sa1 and Sa2), the b brachium pontis is composed in series by two power switch pipes with anti-paralleled diode of up/down (Sb1 and Sb2), and is in parallel with capacitor C again after two brachium pontis parallel connections of a and b.
As shown in Figure 2, modular multilevel matrix converter 1M
3The H bridge submodule grouping schematic diagram of C, wherein, first group of H bridge submodule 3 is 1 to N/2 H bridge submodule 3 of each matrix unit 2, remaining H bridge submodule 3 is second group, when N was even number, first group equal with second group of H bridge submodule 3 quantity, when N is odd number, first group of each matrix unit 2 and second group of H bridge submodule 3SM quantity differ one, and N/2 can adopt truncation or round up and round processing.
Fig. 3 has provided modular multilevel matrix converter 1M of the present invention
3C main circuit connection figure, wherein, current-limiting resistance 4R plays the metering function of electric capacity precharge, prevent that the electric capacity pre-charge process from impacting the electrical network generation current, by-pass switch 5K1 realizes after precharge finishes current-limiting resistance 1R being implemented bypass, by-pass switch 5K1 is in parallel with current-limiting resistance 4R, and 6K2 connects with circuit breaker, is serially connected in power supply 7 and converter 1M
3Between the input of C, converter 1M
3The output of C is unsettled.
It is modular multilevel matrix converter 1M of the present invention that Fig. 4 has provided
3C electric capacity grouping pre-charge method flow chart.To modular multilevel matrix converter 1M
3C electric capacity precharge step implementation is as follows:
(1) switching tube Sa1, Sa2, Sb1 and the Sb2 of all H bridge submodule 3SM of locking, bypass switch opens 5K1, closed AC power 7 and circuit breaker 6K2, system at first enters does not control the rectification pre-charging stage;
(2) after capacitor charging makes the control power work of all H bridge submodule 3SM switching tubes normal, change the grouping pre-charging stage over to;
(3) trigger described modular multilevel matrix converter 1M
3Lower switching tube Sa2 and the Sb2 conducting of second group of H bridge submodule 3SM of C trigger described modular multilevel matrix converter 1M
3Lower switching tube Sa2(or the Sb2 of first group of H bridge submodule 3SM of C) conducting, system is to converter 1M
3First group of H bridge submodule 3SM capacitor charging of C is as converter 1M
3When first group of H bridge of C submodule 3SM capacitance voltage reached its set point, first group of charging was complete, at this moment lock modules multilevel matrix converter 1M
3Lower switching tube Sb2(or the Sa2 of second group of H bridge of C submodule 3SM), trigger mode blocking multilevel matrix converter 1M
3Lower switching tube Sa2 and the Sb2 conducting of first group of H bridge submodule 3SM of C, system is to modular multilevel matrix converter 1M
3Second group of H bridge submodule 3SM capacitor charging of C is as modular multilevel matrix converter 1M
3When second group of H bridge of C submodule 3SM capacitance voltage reaches its set point, second group also charge complete, lock modules multilevel matrix converter 1M
3All switching tubes of C, modular multilevel matrix converter 1M
3All H bridge submodule 3SM electric capacity precharge of C finish.
(4) closes bypass switch 5K1 implements bypass to current-limiting resistance 4R, and system withdraws from the electric capacity pre-charge state.
In the described step (3), to modular multilevel matrix converter 1M
3The capacitor charging of each group order can be exchanged among the C.
It is the charging voltage oscillogram of electric capacity grouping pre-charge method of the present invention that Fig. 5 has provided.
Electric capacity grouping pre-charge method of the present invention is not only applicable to 3 * 3 pattern blocking multilevel matrix converter M
3C also is applicable to m * N-shaped modular multilevel matrix converter M
3C and sparse matrix type M
3C.
Although above-mentionedly by reference to the accompanying drawings the specific embodiment of the present invention is described; but be not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (4)
1. modular multilevel matrix converter electric capacity pre-charge system, it comprises modular multilevel matrix converter M
3C is characterized in that, described modular multilevel matrix converter M
3The input of C is connected described modular multilevel matrix converter M with series connection starting current-limiting resistance R, by-pass switch K1 and circuit breaker K2 successively with AC power
3The output of C is unsettled.
2. the grouping pre-charge method of a modular multilevel matrix converter electric capacity pre-charge system claimed in claim 1 is characterized in that concrete steps are:
Step 1: with modular multilevel matrix converter M
3H bridge submodule among the C in each matrix unit is divided into two groups, wherein N/2 H bridge of first H bridge submodule to the submodule in each matrix unit is divided into first group, when N is odd number, adopt the method that rounds up to round processing, all the other the H bridge submodules in each matrix unit are divided into second group;
Step 2: switching tube Sa1, Sa2, Sb1 and the Sb2 of all H bridge submodules of locking, bypass switch opens K1, closed AC power and circuit breaker K2, system at first enters does not control the rectification pre-charging stage;
Step 3: after capacitor charging makes the control power work of all H bridge submodule SM switching tubes normal, change the grouping pre-charging stage over to;
Step 4: trigger described modular multilevel matrix converter M by control
3The a of two groups of H bridge submodules of C, lower switching tube Sa2 and the Sb2 of b brachium pontis realize grouping precharge;
Step 5: closes bypass switch K1 implements bypass to current-limiting resistance R, and system withdraws from the electric capacity pre-charge state.
3. grouping pre-charge method as claimed in claim 2 is characterized in that, described pre-charge method is: trigger described modular multilevel matrix converter M
3Lower switching tube Sa2 and the Sb2 conducting of second group of H bridge submodule of C trigger described modular multilevel matrix converter M
3Lower switching tube Sa2 or the Sb2 conducting of first group of H bridge submodule of C, system is to M
3First group of H bridge submodule capacitor charging of C worked as M
3When first group of H bridge of C submodule capacitance voltage reached its set point, first group of charging was complete, at this moment lock modules multilevel matrix converter M
3Lower switching tube Sb2 or the Sa2 of second group of H bridge of C submodule, trigger mode blocking multilevel matrix converter M
3Lower switching tube Sa2 and the Sb2 conducting of first group of H bridge submodule of C, system is to modular multilevel matrix converter M
3Second group of H bridge submodule capacitor charging of C is as modular multilevel matrix converter M
3When second group of H bridge of C submodule capacitance voltage reaches its set point, second group also charge complete, lock modules multilevel matrix converter M
3All switching tubes of C, modular multilevel matrix converter M
3All H bridge submodule electric capacity precharge of C finish.
4. grouping pre-charge method as claimed in claim 3 is characterized in that, in the described step 4, to modular multilevel matrix converter M
3The capacitor charging of each group order can be exchanged among the C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210562824.9A CN102983735B (en) | 2012-12-21 | 2012-12-21 | Pre-charge system and method for capacitor of modular multi-level matrix converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210562824.9A CN102983735B (en) | 2012-12-21 | 2012-12-21 | Pre-charge system and method for capacitor of modular multi-level matrix converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102983735A true CN102983735A (en) | 2013-03-20 |
| CN102983735B CN102983735B (en) | 2015-05-20 |
Family
ID=47857534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210562824.9A Expired - Fee Related CN102983735B (en) | 2012-12-21 | 2012-12-21 | Pre-charge system and method for capacitor of modular multi-level matrix converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102983735B (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595237A (en) * | 2013-11-29 | 2014-02-19 | 哈尔滨工业大学 | Method for pre-charging of sub-module capacitor of modularized multi-level converter |
| CN103683282A (en) * | 2013-12-13 | 2014-03-26 | 荣信电力电子股份有限公司 | Method for paralleling shutdown converter station again in multi-end flexible direct-current transmission system |
| CN103746542A (en) * | 2013-12-31 | 2014-04-23 | 芜湖国睿兆伏电子有限公司 | Circuit for eliminating pulse impacting of pulse transformer |
| EP2947766A1 (en) * | 2014-05-19 | 2015-11-25 | Siemens Aktiengesellschaft | Power supply for a non-linear load with multi-level matrix converters |
| CN105826924A (en) * | 2016-03-22 | 2016-08-03 | 中电普瑞科技有限公司 | Series-parallel combined compensator and method of restraining high voltage direct current (HVDC) commutation failure |
| CN106786535A (en) * | 2016-12-29 | 2017-05-31 | 上海科梁信息工程股份有限公司 | Grid stimulating device and its control method |
| CN104242625B (en) * | 2014-09-26 | 2019-01-04 | 徐州中矿大传动与自动化有限公司 | A kind of five-level converter pre-charging device and control device and control method |
| CN110661410A (en) * | 2019-09-24 | 2020-01-07 | 杭州电子科技大学 | Modular multilevel matrix converter starting method with protection property |
| CN110798060A (en) * | 2019-09-24 | 2020-02-14 | 杭州电子科技大学 | M3C pre-charging method based on interleaved grouping |
| CN112165245A (en) * | 2020-07-31 | 2021-01-01 | 国电南瑞科技股份有限公司 | MMC converter starting method and system |
| CN113097957A (en) * | 2021-05-25 | 2021-07-09 | 贵州电网有限责任公司 | Voltage source type direct-current ice melting device, flexible interconnection system and control method |
| EP3866326A1 (en) * | 2020-02-17 | 2021-08-18 | Siemens Aktiengesellschaft | Converter and method for the operation of same |
| US11101755B2 (en) | 2017-07-21 | 2021-08-24 | Siemens Aktiengesellschaft | Arrangement for injecting electric power into an AC network by means of an asynchronous machine, and method for operating the asynchronous machine |
| CN114649961A (en) * | 2022-03-22 | 2022-06-21 | 东北电力大学 | M x N type modular multilevel AC-AC converter topological structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070073445A1 (en) * | 2005-09-27 | 2007-03-29 | Gamesa Eolica, S.A. | Method for operation of a converter system |
| CN102832872A (en) * | 2012-02-09 | 2012-12-19 | 上海交通大学 | Multi-level matrix frequency converter based speed-regulating control system of mine hoist |
| CN102832801A (en) * | 2012-09-19 | 2012-12-19 | 山东大学 | System and method for grouping and pre-charging modular multilevel converter capacitor |
| CN202997660U (en) * | 2012-12-21 | 2013-06-12 | 山东大学 | Capacitive pre-charging system for modular multi-level matrix converter |
-
2012
- 2012-12-21 CN CN201210562824.9A patent/CN102983735B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070073445A1 (en) * | 2005-09-27 | 2007-03-29 | Gamesa Eolica, S.A. | Method for operation of a converter system |
| CN102832872A (en) * | 2012-02-09 | 2012-12-19 | 上海交通大学 | Multi-level matrix frequency converter based speed-regulating control system of mine hoist |
| CN102832801A (en) * | 2012-09-19 | 2012-12-19 | 山东大学 | System and method for grouping and pre-charging modular multilevel converter capacitor |
| CN202997660U (en) * | 2012-12-21 | 2013-06-12 | 山东大学 | Capacitive pre-charging system for modular multi-level matrix converter |
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595237A (en) * | 2013-11-29 | 2014-02-19 | 哈尔滨工业大学 | Method for pre-charging of sub-module capacitor of modularized multi-level converter |
| CN103595237B (en) * | 2013-11-29 | 2015-09-30 | 哈尔滨工业大学 | A kind of submodule electric capacity pre-charge method of modularization multi-level converter |
| CN103683282A (en) * | 2013-12-13 | 2014-03-26 | 荣信电力电子股份有限公司 | Method for paralleling shutdown converter station again in multi-end flexible direct-current transmission system |
| CN103683282B (en) * | 2013-12-13 | 2015-08-19 | 荣信电力电子股份有限公司 | To stop transport in Multi-end flexible direct current transmission system current conversion station paralleling method again |
| CN103746542A (en) * | 2013-12-31 | 2014-04-23 | 芜湖国睿兆伏电子有限公司 | Circuit for eliminating pulse impacting of pulse transformer |
| US20170208654A1 (en) * | 2014-05-19 | 2017-07-20 | Siemens Aktiengesellschaft | Power supply for a non-linear load with multilevel matrix converters |
| WO2015176899A1 (en) | 2014-05-19 | 2015-11-26 | Siemens Aktiengesellschaft | Power supply for a non-linear load with multilevel matrix converters |
| CN106464146A (en) * | 2014-05-19 | 2017-02-22 | 西门子公司 | Power supply for a non-linear load with multilevel matrix converters |
| US10470259B2 (en) | 2014-05-19 | 2019-11-05 | Siemens Aktiengesellschaft | Power supply for a non-linear load with multilevel matrix converters |
| EP2947766A1 (en) * | 2014-05-19 | 2015-11-25 | Siemens Aktiengesellschaft | Power supply for a non-linear load with multi-level matrix converters |
| CN104242625B (en) * | 2014-09-26 | 2019-01-04 | 徐州中矿大传动与自动化有限公司 | A kind of five-level converter pre-charging device and control device and control method |
| CN105826924A (en) * | 2016-03-22 | 2016-08-03 | 中电普瑞科技有限公司 | Series-parallel combined compensator and method of restraining high voltage direct current (HVDC) commutation failure |
| CN106786535B (en) * | 2016-12-29 | 2019-07-23 | 上海科梁信息工程股份有限公司 | Grid stimulating device and its control method |
| CN106786535A (en) * | 2016-12-29 | 2017-05-31 | 上海科梁信息工程股份有限公司 | Grid stimulating device and its control method |
| US11101755B2 (en) | 2017-07-21 | 2021-08-24 | Siemens Aktiengesellschaft | Arrangement for injecting electric power into an AC network by means of an asynchronous machine, and method for operating the asynchronous machine |
| CN110661410A (en) * | 2019-09-24 | 2020-01-07 | 杭州电子科技大学 | Modular multilevel matrix converter starting method with protection property |
| CN110798060A (en) * | 2019-09-24 | 2020-02-14 | 杭州电子科技大学 | M3C pre-charging method based on interleaved grouping |
| EP3866326A1 (en) * | 2020-02-17 | 2021-08-18 | Siemens Aktiengesellschaft | Converter and method for the operation of same |
| CN112165245A (en) * | 2020-07-31 | 2021-01-01 | 国电南瑞科技股份有限公司 | MMC converter starting method and system |
| CN113097957A (en) * | 2021-05-25 | 2021-07-09 | 贵州电网有限责任公司 | Voltage source type direct-current ice melting device, flexible interconnection system and control method |
| CN114649961A (en) * | 2022-03-22 | 2022-06-21 | 东北电力大学 | M x N type modular multilevel AC-AC converter topological structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102983735B (en) | 2015-05-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102983735B (en) | Pre-charge system and method for capacitor of modular multi-level matrix converter | |
| CN202997660U (en) | Capacitive pre-charging system for modular multi-level matrix converter | |
| CN102832801B (en) | System and method for grouping and pre-charging modular multilevel converter capacitor | |
| CN102769289B (en) | Three-phase unified power quality conditioner (UPQC) topological circuit based on modular multilevel converter (MMC) and pre-charging method of three-phase UPQC topological circuit | |
| CN102969882B (en) | Starting method of modular multi-level flexible direct-current transmission converter | |
| CN103248254A (en) | Pre-charging system and method for modular multilevel inverter | |
| CN108923632A (en) | A kind of more level BOOST devices | |
| CN108347180B (en) | The method that cascade converter system and its converter module put into operation | |
| CN103311944A (en) | Unified power flow controller adopting modular structure and starting method for unified power flow controller | |
| CN104143831A (en) | Method for pre-charging third-terminal modular multi-level converter | |
| Amankwah et al. | Experimental validation of a parallel hybrid modular multilevel voltage source converter for HVDC transmission | |
| CN103280829A (en) | Isolation double-stage chain type current transformer applied to energy storage of high-capacity battery | |
| CN106992535B (en) | Constant current pre-charging method for high-voltage direct-current bus capacitor of electric energy router | |
| CN103595237A (en) | Method for pre-charging of sub-module capacitor of modularized multi-level converter | |
| CN102355125B (en) | Soft start circuit of converter | |
| CN103036449A (en) | Four-quadrant three-level power unit and high-voltage inverter | |
| Tan et al. | A bipolar-DC-bus EV fast charging station with intrinsic DC-bus voltages equalization and minimized voltage ripples | |
| CN102820666B (en) | Three-phase power electronic transformer capable of balancing asymmetric load | |
| CN102447261B (en) | Alternate charging starting circuit and control method for chained static synchronous compensator | |
| CN105897025A (en) | Modular multilevel converter sub-module voltage equalization method | |
| CN103178720A (en) | High-voltage matrix converter | |
| CN204497970U (en) | A kind of transless cascade multilevel converter electric capacity pre-charge circuit | |
| CN113726136A (en) | Conversion device | |
| CN108879651B (en) | DAB-based high-power dual-modular hybrid energy storage system and grid connection method | |
| CN100571007C (en) | Superconducting energy storage bidirectional multi-level soft switch DC/DC and voltage side phase-shift controlling method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150520 Termination date: 20171221 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |