CN204967648U - Many level of modularization transverter of full -bridge and series -parallel connection of half -bridge submodule piece - Google Patents
Many level of modularization transverter of full -bridge and series -parallel connection of half -bridge submodule piece Download PDFInfo
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- CN204967648U CN204967648U CN201520728915.4U CN201520728915U CN204967648U CN 204967648 U CN204967648 U CN 204967648U CN 201520728915 U CN201520728915 U CN 201520728915U CN 204967648 U CN204967648 U CN 204967648U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The utility model discloses a many level of modularization transverter of full -bridge and series -parallel connection of half -bridge submodule piece, including the three -phase unit that is connected with the three phase current that corresponds respectively, every unit all includes bridge arm and bridge arm down, go up the bridge arm under and the bridge arm structure the same, all including the M semibridge system submodule piece, a N full -bridge posture module and the inductance L0 that establish ties mutually, because different capacitance values is chooseed for use to different submodule pieces, can cause the speed of charging nonconformity. Conventional charge mode can not satisfy topological the charging normal of this submodule piece series -parallel connection MMC. The utility model discloses a naturally, soft stage of opening and soft opening the voltage -sharing stage guarantee that different submodule piece voltages are the same.
Description
Technical field
The utility model relates to new forms of energy and field of power, specifically will relate to the modularization multi-level converter of full-bridge and the series-parallel connection of half-bridge submodule.
Background technology
Based on voltage source converter Technology of HVDC based Voltage Source Converter due to its decoupled active and reactive independently control, light current net can be accessed, power to passive load, possess power grid"black-start" ability, dynamic response is fast, harmonic characterisitic is excellent and floor space is little etc. plurality of advantages, power at extensive intermittent new-energy grid-connected, the passive load of isolated island, the interconnected and city intelligent of AC network apply more and more widely for obtaining in distribution etc.
German scholar RainerMarquardt describes the full-bridge submodule MMC topology having and pass through serious DC Line Fault ability, when there is direct-current short circuit fault, fault current can be suppressed by locking converter, but needed for full-bridge submodule, switching device is the twice of half-bridge submodule, adds the construction cost of converter.
Thus, industry proposes brachium pontis full-bridge submodule and other submodule series-parallel connections being formed MMC, on the basis maintaining DC Line Fault ride-through capability, reduces system cost.But simply by the full-bridge submodule of identical parameters and other submodule series-parallel connections, system configuration is not the most reasonably selected, urgently propose one and reasonably distribute rationally, and provide corresponding control method to support for this is distributed rationally.
Utility model content
For solving the deficiency that prior art exists, the utility model discloses modularization multi-level converter and the starting method of full-bridge and the series-parallel connection of half-bridge submodule, the modularization multi-level converter of full-bridge and the series-parallel connection of half-bridge submodule is optimized configuration, and provides corresponding control method to support for this is distributed rationally.
For achieving the above object, concrete scheme of the present utility model is as follows:
The modularization multi-level converter of full-bridge and the series-parallel connection of half-bridge submodule, comprise the three phase units be connected with corresponding three phase mains respectively, each unit includes brachium pontis and lower brachium pontis, upper brachium pontis and lower bridge arm structure identical, include M the semibridge system submodule be in series, N number of full-bridge type submodule and inductance L
0;
The switch element that semibridge system submodule comprises electric capacity and is in parallel with this electric capacity, described switch element comprises two IGBT be in series, and each IGBT is all in parallel with corresponding backward diode;
Two switch elements that full-bridge type submodule comprises electric capacity and is in parallel with this electric capacity, each switch element comprises two IGBT be in series, and each IGBT is all in parallel with corresponding backward diode.
Further, semibridge system submodule or the quantity of full-bridge type submodule equal with the quantity of full-bridge type submodule and the quantity of semibridge system submodule are 2:1.The requirement of integrated system cost, loss, capacity and DC Line Fault ride-through capability each side, when system does not need to improve direct voltage utilance, suggestion selects full-bridge and semibridge system submodule respectively to use the configuration mode of half; When system needs to improve direct voltage utilance to provide through-put power as far as possible, the full-bridge type submodule of 2/3 and the semibridge system submodule of 1/3 are selected in suggestion.
Preferably, semibridge system submodule should be identical with the rated capacity voltage of full-bridge type submodule, because modularization multi-level converter is mainly used in high-power occasion, the rated capacity voltage of submodule is selected mainly to be subject to device constraints, therefore, full-bridge type submodule should be identical with the rated capacity voltage of semibridge system submodule, and the rated voltage according to power device chooses reasonable value.
The capacitance of full-bridge type submodule is set to two times of semibridge system submodule capacitance.Due to the effect of full-bridge type submodule in DC Line Fault crossing process, suitably should improve the capacitance of full-bridge submodule, but different submodule capacitance difference should be avoided excessive on the impact that system starts and control brings, so the capacitance of the full-bridge type submodule in system to be set to two times of semibridge system submodule capacitance.
The starting method of the modularization multi-level converter of full-bridge and the series-parallel connection of half-bridge submodule, comprising:
Charging flow starts: input coefficient is soft opens resistance, closed AC circuit breaker, carry out that nature is soft opens the stage, after group module voltage reaches piezoelectric voltage, enter soft opening and all press the stage, excise L submodule and continue charging, after system stability (namely charging current decays to close to zero), excise and softly open resistance, unlock converter and carry out constant DC voltage control, continue to charge to stable, charging complete.
Further, the stage is opened naturally soft, forward, negative sense bridge arm current are full-bridge type submodule and charge, semibridge system submodule only charges within the time period that bridge arm current is positive, therefore after the naturally soft stage of opening terminates, in identical brachium pontis, full-bridge type submodule capacitor charging energy is two times of semibridge system submodule, and the capacitance of full-bridge type submodule is set to two times of semibridge system submodule electric capacity, therefore, it is possible to ensure that the capacitance voltage of two seed module is identical.
Further, soft opening all presses the stage, excises the submodule of some in same brachium pontis, the still locking of all the other submodules, excises soft resistance and unlock converter after reaching stable state.
In the bridge arm current positive and negative moment, all full-bridge type submodule is charged, by all pressure effects, the rechargeable energy of full-bridge type submodule can be adjusted to two times of semibridge system submodule, and ensure that different submodule voltage is identical.
The submodule of excision needs L the submodule that voltage in Dynamic Selection brachium pontis is the highest, and the number of L is determined by following formula:
Wherein, M is full-bridge type submodule number in single brachium pontis, and N is semibridge system submodule number in single brachium pontis, U
linefor system valve side line voltage, U
c_ratedfor submodule load voltage value.
When DC bipolar short trouble being detected, locking converter immediately, during when the submodule capacitor voltage of upper and lower bridge arm with higher than ac line voltage peak value, direct current can be suppressed to zero by the back electromotive force that submodule electric capacity provides, thus realizes DC Line Fault and pass through.
The beneficial effects of the utility model:
The capacitance of the full-bridge type submodule mentioned by the utility model is set to two times of semibridge system submodule electric capacity, and at DC Line Fault early period of origination, fault current can flow through full-bridge type submodule electric capacity, charges to full-bridge type submodule electric capacity.Thus cause full-bridge type submodule capacitor voltage, exceed submodule rated voltage.If this capacitance voltage is excessive, can unlocks in system and cause larger impulse current instantaneously, suitably improve full-bridge type submodule capacitance and be conducive to solving this problem.
Because different submodule selects different capacitances, charging rate can be caused inconsistent.Conventional charging modes can not meet charging normal of this submodule series-parallel connection MMC topology.The utility model adopts that nature is soft opens the stage and soft opening all presses the stage, ensures that different submodule voltage is identical.
Accompanying drawing explanation
Fig. 1 is full-bridge submodule and half-bridge submodule Mixed cascading MMC topology;
Fig. 2 is mixing sub module cascade MMC topology passes through operating mode equivalent electric circuit at DC Line Fault;
Fig. 3 is the Booting sequence figure of mixing sub module cascade MMC topology.
Embodiment:
Below in conjunction with accompanying drawing, the utility model is described in detail:
As shown in Figure 1, the full-bridge of the utility model embodiment and the modularization multi-level converter of half-bridge submodule series-parallel connection, comprise the three phase units be connected with corresponding three phase mains respectively, each unit includes brachium pontis and lower brachium pontis, upper brachium pontis and lower bridge arm structure identical, include M the semibridge system submodule be in series, N number of full-bridge type submodule and inductance L
0;
The switch element that semibridge system submodule comprises electric capacity and is in parallel with this electric capacity, described switch element comprises two IGBT be in series, and each IGBT is all in parallel with corresponding backward diode;
Two switch elements that full-bridge type submodule comprises electric capacity and is in parallel with this electric capacity, each switch element comprises two IGBT be in series, and each IGBT is all in parallel with corresponding backward diode.
First this utility model needs the requirement of integrated system cost, loss, capacity and DC Line Fault ride-through capability each side, provides the number configuration of system sub-modules.Then provide the rated capacity voltage of different submodule according to switching device constraint, and by the functional analysis that the DC Line Fault of full-bridge submodule passes through, setting full-bridge submodule capacitance is two times of half-bridge submodule.Finally give novel system configuration lower corresponding system start method.The method comprises soft the opening of nature and all presses two stages with soft opening, and wherein by opening the improvement of pressure equalizing control method to traditional soft, can meet the voltage-sharing of different submodule capacitor voltage.
1. system sub-modules number configuration
For simplified illustration, this patent selects the modularization multi-level converter of full-bridge and the series-parallel connection of half-bridge submodule to carry out the explanation of novel system configuration and starting method.But the method is equally applicable to the converter topology of full-bridge and other a kind of and multiple submodule series-parallel connections.
The requirement of integrated system cost, loss, capacity and DC Line Fault ride-through capability each side, when system does not need to improve direct voltage utilance, suggestion selects full-bridge and half-bridge submodule respectively to use the configuration mode of half; When system needs to improve direct voltage utilance to provide through-put power as far as possible, the full-bridge submodule of 2/3 and the half-bridge submodule of 1/3 are selected in suggestion.
2. submodule parameter configuration
Because modularization multi-level converter is mainly used in high-power occasion, the rated capacity voltage of submodule is selected mainly to be subject to device constraints, therefore, full-bridge submodule should be identical with the rated capacity voltage of half-bridge submodule, and the rated voltage according to power device chooses reasonable value.
Due to the effect of full-bridge submodule in DC Line Fault crossing process (seeing below), suitably should improve the capacitance of full-bridge submodule, but different submodule capacitance difference should be avoided excessive on the impact that system starts and control brings, this patent recommends two times that the capacitance of the full-bridge submodule in system are set to half-bridge submodule capacitance.
When DC bipolar short trouble being detected, locking converter immediately, now mixes the MMC topoligical equivalence circuit of sub module cascade as shown in Figure 2.Under this fault condition, two seed module are all in locking and bridge arm current is negative, and now half-bridge submodule can be equivalent to diode series connection, and full-bridge submodule can be equivalent to electric capacity and Diode series, can obtain equivalent circuit diagram as shown in the figure thus.When illustrate upper and lower bridge arm submodule capacitor voltage and higher than ac line voltage peak value time, submodule electric capacity can provide enough back electromotive force that direct current is reduced to zero, thus realizes DC Line Fault and pass through.
At DC Line Fault early period of origination, fault current can flow through full-bridge submodule electric capacity, charges to full-bridge submodule electric capacity.Thus cause full-bridge submodule capacitor voltage, exceed submodule rated voltage.If this capacitance voltage is excessive, can unlocks in system and cause larger impulse current instantaneously, suitably improve full-bridge submodule capacitance and be conducive to solving this problem.
3. the startup strategy under novel system configuration
Because different submodule selects different capacitances, charging rate can be caused inconsistent.Conventional charging modes can not meet charging normal of this submodule series-parallel connection MMC topology.
Starting method is divided into following steps:
1. naturally softly open the stage
Because MMC submodule control unit is many by the power taking of submodule electric capacity, therefore in the process of zero voltage start-up, a naturally soft stage must be experienced.In this stage, IGBT is uncontrollable, and electric capacity is charged by anti-paralleled diode.
Forward, negative sense bridge arm current are full-bridge submodule and charge, and half-bridge submodule only charges within the time period that bridge arm current is positive, therefore, after the naturally soft stage of opening terminates, in identical brachium pontis, full-bridge submodule capacitor charging energy is two times of half-bridge submodule.But due to two times that the capacitance of full-bridge submodule are set to half-bridge submodule electric capacity above, therefore, it is possible to ensure that the capacitance voltage of two seed module is substantially identical.
2. soft opening all presses the stage
If open charging by means of only naturally soft, submodule voltage can not be charged to rated value, and there is the risk that submodule voltage disperses, and is therefore necessary that carrying out soft opening all presses.
Traditional different sub module cascade MMC, in start-up course, are used in bridge arm current for excising whole submodule, to ensure the equilibrium of submodule time negative.
The party's rule needs no matter bridge arm current is positive and negative, excises the submodule of some, the still locking of all the other submodules, excise soft resistance and unlock converter after reaching stable state in same brachium pontis.
In the bridge arm current positive and negative moment, all full-bridge submodule is charged, by all pressure effects, the rechargeable energy of full-bridge submodule can be adjusted to two times of half-bridge submodule, and ensure that different submodule voltage is identical.
The submodule of excision needs L the submodule that voltage in Dynamic Selection brachium pontis is the highest.The number of L is determined by following formula:
Wherein, M is full-bridge submodule number in single brachium pontis, and N is half-bridge submodule number in single brachium pontis, U
linefor system valve side line voltage, U
c_ratedfor submodule load voltage value.
Booting sequence figure as shown in Figure 3, first drops into and softly opens resistance, carries out that nature is soft to be opened.After group module voltage reaches piezoelectric voltage, enter soft opening and all press the stage, excise L submodule and continue charging, after system stability, excise and softly open resistance, continue to charge to stable, unlock converter, charging complete.
By reference to the accompanying drawings embodiment of the present utility model is described although above-mentioned; but the restriction not to the utility model protection range; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection range of the present utility model.
Claims (4)
1. the modularization multi-level converter of full-bridge and the series-parallel connection of half-bridge submodule, it is characterized in that, comprise the three phase units be connected with corresponding three phase mains respectively, each unit includes brachium pontis and lower brachium pontis, upper brachium pontis and lower bridge arm structure identical, include M the semibridge system submodule be in series, N number of full-bridge type submodule and inductance L
0;
The switch element that semibridge system submodule comprises electric capacity and is in parallel with this electric capacity, described switch element comprises two IGBT be in series, and each IGBT is all in parallel with corresponding backward diode;
Two switch elements that full-bridge type submodule comprises electric capacity and is in parallel with this electric capacity, each switch element comprises two IGBT be in series, and each IGBT is all in parallel with corresponding backward diode.
2. the modularization multi-level converter of full-bridge as claimed in claim 1 and the series-parallel connection of half-bridge submodule, is characterized in that, semibridge system submodule or the quantity of full-bridge type submodule equal with the quantity of full-bridge type submodule and the quantity of semibridge system submodule are 2:1.
3. the modularization multi-level converter of full-bridge as claimed in claim 1 and the series-parallel connection of half-bridge submodule, it is characterized in that, semibridge system submodule is identical with the rated capacity voltage of full-bridge type submodule.
4. the modularization multi-level converter of full-bridge as claimed in claim 1 and the series-parallel connection of half-bridge submodule, it is characterized in that, the capacitance of full-bridge type submodule is set to two times of semibridge system submodule capacitance.
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Cited By (11)
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| CN105119508A (en) * | 2015-09-18 | 2015-12-02 | 山东建筑大学 | Modularized multi-level current converter with hybrid-cascaded full-bridge and half-bridge sub-modules and starting method thereof |
| CN107947213A (en) * | 2016-10-12 | 2018-04-20 | 特变电工新疆新能源股份有限公司 | A kind of startup method of the Multi-end flexible direct current transmission system containing full-bridge modules |
| WO2018108143A1 (en) * | 2016-12-16 | 2018-06-21 | 台达电子企业管理（上海）有限公司 | Modular power supply system |
| US10148164B2 (en) | 2017-02-27 | 2018-12-04 | Delta Electronics (Shanghai) Co., Ltd. | Topology of composite cascaded high-voltage and low-voltage modules |
| TWI661634B (en) * | 2016-12-16 | 2019-06-01 | 大陸商台達電子企業管理（上海）有限公司 | Modular power system |
| US10374504B2 (en) | 2016-12-16 | 2019-08-06 | Delta Electronics (Shanghai) Co., Ltd | Power unit and power electronic converting device |
| CN110441630A (en) * | 2019-07-30 | 2019-11-12 | 国电南瑞科技股份有限公司 | A kind of the MMC submodule function detection device and method of flexibly configurable |
| CN110739839A (en) * | 2019-09-19 | 2020-01-31 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | charging method for extra-high voltage flexible direct current full-bridge half-bridge hybrid converter |
| CN111559266A (en) * | 2020-06-10 | 2020-08-21 | 南京工程学院 | Charging device for electric automobile |
| CN111756265A (en) * | 2020-07-28 | 2020-10-09 | 华北电力大学（保定） | Half-level MMC topological structure and modulation method thereof |
| US11349384B2 (en) | 2018-02-23 | 2022-05-31 | Hitachi Energy Switzerland Ag | Energization of a converter including a mix of half-bridge and full-bridge submodules |
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| CN105119508B (en) * | 2015-09-18 | 2017-09-22 | 山东建筑大学 | Full-bridge and the modularization multi-level converter and startup method of half-bridge submodule series-parallel connection |
| CN105119508A (en) * | 2015-09-18 | 2015-12-02 | 山东建筑大学 | Modularized multi-level current converter with hybrid-cascaded full-bridge and half-bridge sub-modules and starting method thereof |
| CN107947213B (en) * | 2016-10-12 | 2021-04-13 | 特变电工新疆新能源股份有限公司 | Starting method of multi-terminal flexible direct-current power transmission system with full-bridge module |
| CN107947213A (en) * | 2016-10-12 | 2018-04-20 | 特变电工新疆新能源股份有限公司 | A kind of startup method of the Multi-end flexible direct current transmission system containing full-bridge modules |
| US10374504B2 (en) | 2016-12-16 | 2019-08-06 | Delta Electronics (Shanghai) Co., Ltd | Power unit and power electronic converting device |
| TWI661634B (en) * | 2016-12-16 | 2019-06-01 | 大陸商台達電子企業管理（上海）有限公司 | Modular power system |
| US11463016B2 (en) | 2016-12-16 | 2022-10-04 | Delta Electronics (Shanghai) Co., Ltd | Modular power supply system |
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| WO2018108143A1 (en) * | 2016-12-16 | 2018-06-21 | 台达电子企业管理（上海）有限公司 | Modular power supply system |
| US11101740B2 (en) | 2016-12-16 | 2021-08-24 | Delta Electronics (Shanghai) Co., Ltd | Modular power supply system |
| US10924030B2 (en) | 2016-12-16 | 2021-02-16 | Delta Electronics (Shanghai) Co., Ltd | Modular power supply system |
| US10148164B2 (en) | 2017-02-27 | 2018-12-04 | Delta Electronics (Shanghai) Co., Ltd. | Topology of composite cascaded high-voltage and low-voltage modules |
| US11349384B2 (en) | 2018-02-23 | 2022-05-31 | Hitachi Energy Switzerland Ag | Energization of a converter including a mix of half-bridge and full-bridge submodules |
| CN110441630B (en) * | 2019-07-30 | 2021-10-22 | 国电南瑞科技股份有限公司 | Flexibly configurable MMC sub-module function detection device and method |
| CN110441630A (en) * | 2019-07-30 | 2019-11-12 | 国电南瑞科技股份有限公司 | A kind of the MMC submodule function detection device and method of flexibly configurable |
| CN110739839B (en) * | 2019-09-19 | 2020-10-20 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Charging method for extra-high voltage flexible direct-current full-bridge half-bridge hybrid converter |
| CN110739839A (en) * | 2019-09-19 | 2020-01-31 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | charging method for extra-high voltage flexible direct current full-bridge half-bridge hybrid converter |
| CN111559266B (en) * | 2020-06-10 | 2021-10-26 | 南京工程学院 | Charging device for electric automobile |
| CN111559266A (en) * | 2020-06-10 | 2020-08-21 | 南京工程学院 | Charging device for electric automobile |
| CN111756265A (en) * | 2020-07-28 | 2020-10-09 | 华北电力大学（保定） | Half-level MMC topological structure and modulation method thereof |
| CN111756265B (en) * | 2020-07-28 | 2023-09-01 | 华北电力大学（保定） | Half-level MMC topological structure and modulation method thereof |
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