CN102983735B - 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
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- CN102983735B CN102983735B CN201210562824.9A CN201210562824A CN102983735B CN 102983735 B CN102983735 B CN 102983735B CN 201210562824 A CN201210562824 A CN 201210562824A CN 102983735 B CN102983735 B CN 102983735B
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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, directly connect without the need to power device and just can obtain the stepped-up voltage of many level, there is lower dU/dt and lower voltage harmonic content, adopt ac-ac conversion technology, have broad application prospects in medium/high pressure Large Copacity frequency conversion system.Be illustrated in figure 1 3x3 type three-phase CM
3c converter topology structure, in figure, be connected respectively by 9 matrix units between three-phase I/O, each matrix unit is by N number of submodule (Sub-modular, SM) and inductance cascade form, as shown in Figure 1a, each submodule SM is H bridge construction, as shown in Figure 1 b, submodule DC side parallel has identical capacitor C.Publication number is the Chinese patent disclosed " high voltage converter topological structure is handed over-handed over to a kind of matrix form " of CN102545644A, 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 is normally run, above-mentioned M
3the each submodule capacitor voltage of C needs to be stabilized near its rated voltage, therefore, before system is normally run, must carry out precharge to submodule SM capacitor C, capacitance voltage is reached or close to its rated voltage.
Submodule electric capacity pre-charge method disclosed in existing document is all for Modular multilevel converter (MMC), as " Proceedings of the CSEE " 2009 the 29th " novel many level VSC submodule capacitance parameter with all press strategy " literary composition (author's fourth champion etc.) of volume the 30th phase 1-6 page publication be referred to kind concise and to the point utilize accessory power supply it encourage charging modes; As publication number " the two-phase modularization multi-level converter starting method without the need to auxiliary DC power supply " disclosed in the Chinese patent of CN101795057A, propose a kind of when without the need to auxiliary DC power supply, the self-excitation charging force method of three-phase modular multilevel inverter; As publication number " a kind of starting method of modularization multi-level converter flexible direct current power transmission system " disclosed in the Chinese patent of CN102170140A, propose 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
3c A-A transducer has essential distinction, and therefore existing MMC electric capacity pre-charge method is not suitable for M
3c system.
Summary of the invention
Object of the present invention is exactly to solve the problem, and provides a kind of modular multilevel matrix converter electric capacity pre-charge system and method, solves M
3the electric capacity precharge of C and M
3c system start problem, it has greatly shortens electric capacity precharge time, reduces current-limiting resistance power loss and control 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 starts current-limiting resistance R, by-pass switch K1 and circuit breaker K2 with series connection successively and AC power is connected, described modular multilevel matrix converter M
3the output of C is unsettled.
A grouping pre-charge method for modular multilevel matrix converter electric capacity pre-charge system, concrete steps are:
Step one: by modular multilevel matrix converter M
3h bridge submodule in C in each matrix unit is divided into two groups, first H bridge submodule wherein in each matrix unit is divided into first group to N/2 H bridge submodule, adopt when N is odd number the method rounded up to carry out rounding process, all the other the H bridge submodules in each matrix unit are divided into second group;
Step 2: switching tube Sa1, Sa2, Sb1 and Sb2 of locking all H bridges submodule, bypass switch opens K1, closed AC power and circuit breaker K2, first system enters uncontrollable rectifier pre-charging stage;
Step 3: after capacitor charging makes the control power work of all H bridge submodule SM switching tubes normal, proceed to grouping pre-charging stage;
Step 4: by controlling to trigger described modular multilevel matrix converter M
3lower switching tube Sa2 and Sb2 of a, b brachium pontis of two groups of H bridge submodules of C, realizes grouping precharge;
Step 5: closes bypass switch K1, implement bypass to current-limiting resistance R, system exits electric capacity pre-charge state.
Described pre-charge method is: trigger described modular multilevel matrix converter M
3the lower switching tube Sa2 of second group of H bridge submodule of C and Sb2 conducting, trigger described modular multilevel matrix converter M
3the lower switching tube Sa2 of first group of H bridge submodule of C or Sb2 conducting, system is to M
3first group of H bridge submodule capacitor charging of C, works as M
3when C first group of H bridge submodule capacitor voltage reaches its set point, first group of charging is complete, now lock modules multilevel matrix converter M
3lower switching tube Sb2 or Sa2 of C second group of H bridge submodule, trigger mode blocking multilevel matrix converter M
3the lower switching tube Sa2 of first group of H bridge submodule of C and Sb2 conducting, system is to modular multilevel matrix converter M
3second group of H bridge submodule capacitor charging of C, as modular multilevel matrix converter M
3when C second group of H bridge submodule capacitor voltage reaches its set point, second group is also charged complete, lock modules multilevel matrix converter M
3the all switching tubes of C, modular multilevel matrix converter M
3all H bridge submodule electric capacity precharge of C terminates.
In described step 4, to modular multilevel matrix converter M
3in C, the capacitor charging order of each group can be exchanged.
Beneficial effect of the present invention:
(1) adopt grouping precharge, no matter converter has a few phase, and also no matter matrix unit contains how many H bridge submodules, for modular multilevel matrix converter M
3the H bridge submodule of C is only divided into two groups, substantially reduces the charging interval;
(2) the inventive method, on current-limiting resistance, voltage drop is much smaller than each only to voltage drop during single submodule charging, therefore greatly reduces the power of current-limiting resistance;
(3) do not need to detect charging current direction, control simple;
(4) do not need to drop into 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 external control power supply.
Accompanying drawing explanation
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 of the present invention grouping precharge flow chart;
Fig. 5 is electric capacity of the present invention grouping pre-charge voltage curve chart.
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
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
As shown in Figure 1, a kind of 3 × 3 modular multilevel matrix converter M are given
3c topological structure schematic diagram, wherein, has 9 matrix units, and each matrix unit is in series by N number of H bridge submodule 3SM and reactor L; Fig. 1 a gives the structure chart of matrix unit, Fig. 1 b gives the topology diagram of H bridge submodule 3, be made up of a and b two brachium pontis, a brachium pontis is with the power switch pipe (Sa1 and Sa2) of anti-paralleled diode to be composed in series by up/down two, b brachium pontis is with the power switch pipe (Sb1 and Sb2) of anti-paralleled diode to be composed in series by up/down two, in parallel with capacitor C again after a and b two brachium pontis parallel connections.
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 the N/2 H bridge submodule 3 of each matrix unit 2, remaining H bridge submodule 3 is second group, when N is 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 carry out rounding process.
Fig. 3 gives 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 electric capacity pre-charge process from impacting electrical network generation current, by-pass switch 5K1 realizes precharge and terminates rear to current-limiting resistance 1R enforcement bypass, by-pass switch 5K1 is in parallel with current-limiting resistance 4R, connects with circuit breaker 6K2, 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 gives
3c electric capacity grouping pre-charge method flow chart.To modular multilevel matrix converter 1M
3c electric capacity precharge step is specifically implemented as follows:
(1) switching tube Sa1, Sa2, Sb1 and Sb2 of locking all H bridges submodule 3SM, bypass switch opens 5K1, closed AC power 7 and circuit breaker 6K2, first system enters uncontrollable rectifier pre-charging stage;
(2) after capacitor charging makes the control power work of all H bridge submodule 3SM switching tubes normal, grouping pre-charging stage is proceeded to;
(3) described modular multilevel matrix converter 1M is triggered
3the lower switching tube Sa2 of second group of H bridge submodule 3SM of C and Sb2 conducting, trigger described modular multilevel matrix converter 1M
3lower switching tube Sa2(or 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, as converter 1M
3when C first group of H bridge submodule 3SM capacitance voltage reaches its set point, first group of charging is complete, now lock modules multilevel matrix converter 1M
3lower switching tube Sb2(or Sa2 of C second group of H bridge submodule 3SM), trigger mode blocking multilevel matrix converter 1M
3the lower switching tube Sa2 of first group of H bridge submodule 3SM of C and Sb2 conducting, system is to modular multilevel matrix converter 1M
3second group of H bridge submodule 3SM capacitor charging of C, as modular multilevel matrix converter 1M
3when C second group of H bridge submodule 3SM capacitance voltage reaches its set point, second group is also charged complete, lock modules multilevel matrix converter 1M
3the all switching tubes of C, modular multilevel matrix converter 1M
3all H bridge submodule 3SM electric capacity precharge of C terminates.
(4) closes bypass switch 5K1, implement bypass to current-limiting resistance 4R, system exits electric capacity pre-charge state.
In described step (3), to modular multilevel matrix converter 1M
3in C, the capacitor charging order of each group can be exchanged.
Fig. 5 give be electric capacity of the present invention grouping pre-charge method charging voltage oscillogram.
Electric capacity grouping pre-charge method of the present invention is not only applicable to 3 × 3 pattern blocking multilevel matrix converter M
3c, is also applicable to m × N-shaped modular multilevel matrix converter M
3c and sparse matrix type M
3c.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but 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 amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (2)
1. a grouping pre-charge method for modular multilevel matrix converter electric capacity pre-charge system, is characterized in that, concrete steps are:
Step one: by modular multilevel matrix converter M
3h bridge submodule in C in each matrix unit is divided into two groups, first H bridge submodule wherein in each matrix unit is divided into first group to N/2 H bridge submodule, adopt when N is odd number the method rounded up to carry out rounding process, all the other the H bridge submodules in each matrix unit are divided into second group;
Step 2: switching tube Sa1, Sa2, Sb1 and Sb2 of locking all H bridges submodule, bypass switch opens K1, closed AC power and circuit breaker K2, first system enters uncontrollable rectifier pre-charging stage;
Step 3: after capacitor charging makes the control power work of all H bridge submodule SM switching tubes normal, proceed to grouping pre-charging stage;
Step 4: by controlling to trigger described modular multilevel matrix converter M
3lower switching tube Sa2 and Sb2 of a, b brachium pontis of two groups of H bridge submodules of C, realizes grouping precharge;
Step 5: closes bypass switch K1, implement bypass to current-limiting resistance R, system exits electric capacity pre-charge state;
The pre-charge method of described step 4 is: trigger described modular multilevel matrix converter M
3the lower switching tube Sa2 of second group of H bridge submodule of C and Sb2 conducting, trigger described modular multilevel matrix converter M
3the lower switching tube Sa2 of first group of H bridge submodule of C or Sb2 conducting, system is to M
3first group of H bridge submodule capacitor charging of C, works as M
3when C first group of H bridge submodule capacitor voltage reaches its set point, first group of charging is complete, now lock modules multilevel matrix converter M
3lower switching tube Sb2 or Sa2 of C second group of H bridge submodule, trigger mode blocking multilevel matrix converter M
3the lower switching tube Sa2 of first group of H bridge submodule of C and Sb2 conducting, system is to modular multilevel matrix converter M
3second group of H bridge submodule capacitor charging of C, as modular multilevel matrix converter M
3when C second group of H bridge submodule capacitor voltage reaches its set point, second group is also charged complete, lock modules multilevel matrix converter M
3the all switching tubes of C, modular multilevel matrix converter M
3all H bridge submodule electric capacity precharge of C terminates.
2. divide into groups pre-charge method as claimed in claim 1, it is characterized in that, in described step 4, to modular multilevel matrix converter M
3in C, the capacitor charging order of each group can be exchanged.
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| CN201210562824.9A CN102983735B (en) | 2012-12-21 | 2012-12-21 | Pre-charge system and method for capacitor of modular multi-level matrix converter |
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| CN201210562824.9A CN102983735B (en) | 2012-12-21 | 2012-12-21 | Pre-charge system and method for capacitor of modular multi-level matrix converter |
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| CN102983735B true CN102983735B (en) | 2015-05-20 |
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| 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 |
| 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 |
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| US7439714B2 (en) * | 2005-09-27 | 2008-10-21 | Gamesa Innovation & Technology, S.L. | Method for operation of a converter system |
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| WO2019015777A1 (en) * | 2017-07-21 | 2019-01-24 | Siemens Aktiengesellschaft | Arrangement for feeding electric power into an ac network by means of an asynchronous machine, and method for operating the asynchronous machine |
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