CN203399000U - MMC-based electronic power transformer - Google Patents
MMC-based electronic power transformer Download PDFInfo
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- CN203399000U CN203399000U CN201320205619.7U CN201320205619U CN203399000U CN 203399000 U CN203399000 U CN 203399000U CN 201320205619 U CN201320205619 U CN 201320205619U CN 203399000 U CN203399000 U CN 203399000U
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Abstract
The utility model provides an MMC-based electronic power transformer. The MMC-based electronic power transformer comprises an MMC and a DC-DC isolator. The MMC comprises a plurality of sub-modules which are connected in series. The direct current output side and the direct current input side of the DC-DC isolator are respectively connected with capacitors in parallel. The direct current output side of the DC-DC isolator is connected with a low voltage direct current power grid. The direct current input side of the DC-DC isolator is connected with the direct current output ends of the sub-modules. Each sub-module comprises a half-bridge circuit and a capacitor, which are connected in parallel. According to the MMC-based electronic power transformer of the utility model, the direct current side output capacitor of the DC-DC isolator is connected in parallel; and when direct current capacitor voltage of the MMC is unbalanced, the sub-modules with high capacitor voltage in the MMC charge the capacitors with low voltage to raise voltage values through the DC-DC isolator with the help of the low voltage direct current power grid and then through the DC-DC isolator again. In this way, the stability of direct current side voltage is guaranteed, and thus the automatic balance of the direct current capacitor voltage of the MMC is achieved.
Description
Technical field
The utility model relates to electrical equipment technical field, particularly relates to the electronic power transformer based on MMC.
Background technology
Development along with World Economics; various forms of electricity needs increase more and more faster; the problem such as energy shortage, environmental protection is day by day serious, and take renewable energy power generation technology that wind power generation, solar power generation be representative, becomes just gradually developing direction and the study hotspot of Future Power System technology.But these clean energy resourcies often exist such as position dispersion, away from features such as power consumer centers, HVDC (High Voltage Direct Current) transmission system based on voltage source type converter can add these small distributed power-supply systems by the mode incoming transport electrical network of economy, environmental protection, and the voltage-type device of high-power is the core component of this type systematic.The power electronic equipment of high-power conversion occasion need to possess high as far as possible electric pressure and power handling capability, and one of key technology that realizes high-voltage high-power converter is high power converter topology.In recent decades, multilevel technology (mainly referring to voltage-type multi-level converter) is constantly promoted.But owing to adopting direct serial connection technology, the inconsistent of device parameters not only can bring device voltage-sharing, electromagnetic interference problem, also can because switching frequency is too high, bring the larger reasons such as switching loss, is difficult to be used widely at high-voltage dc transmission electrical domain.
Modular multi-level converter (Modualize Multi-level Converter, MMC) topology was proposed and was applied to HVDC (High Voltage Direct Current) transmission system field first in 2002 by university of Munich, Germany Federal Defence Forces, with its unique structure and technical advantage, was just becoming study hotspot.This topology is without the direct series connection of device, and has modular, and each module can be used identical hardware configuration, without phase shifting transformer, gathers around and has broad application prospects.Although the correlation theory of modular multi-level converter and technical research have obtained certain progress, also have some problems to be solved completely.Such as the circulation problem of MMC under the particular application such as asymmetric electrical network/load, the existence of the change of current can, with serving negative impact, still also not have effective solution now.In the DC capacitor voltage of MMC power power-supply, contain a large amount of fundamental frequencies and second harmonic, by causing exchanging, in output brachium pontis electric current, occur the low-order harmonic component of can not ignore, and then affect the output characteristic of system.The DC capacitor of each power cell of MMC is separate, and main circuit components and parts are imperfect element, easily causes DC capacitor voltage unbalance and DC capacitor voltage pulsation phenomenon.
In MMC, DC voltage balance control is mainly to realize by outside balance control circuit at present, although can simplify the algorithm design of control program by the method for external balance control circuit, but due to the extra hardware circuit of needs and control system, increase cost and the complexity of system, reduced the reliability of system.
Summary of the invention
Based on this, be necessary to control for DC voltage balance in general MMC the problem that is difficult for realization, a kind of electronic power transformer based on MMC that DC voltage balance is controlled of easily realizing is provided.
A kind of electronic power transformer based on MMC, comprise modular multi-level converter and DC-DC isolator, the AC of described modular multi-level converter connects High-voltage AC Network, the DC side of described modular multi-level converter connects described DC-DC isolator, described modular multi-level converter comprises a plurality of submodules that are connected in series, the DC side of described submodule is positive and negative to be connected with the positive and negative of high-voltage direct current power grid respectively, described DC-DC isolator comprises the first electric capacity and the second electric capacity, in parallel described first electric capacity of direct current outlet side of described DC-DC isolator forms DC output end mouth, described DC output end mouth is connected with low-voltage direct electrical network, in parallel described second electric capacity of direct current input side of described DC-DC isolator forms direct-flow input end mouth, described direct-flow input end mouth is connected with the DC output end of described submodule,
Described submodule comprises half-bridge circuit and electric capacity, described half-bridge circuit and described Capacitance parallel connection.
In an embodiment, the described electronic power transformer based on MMC also comprises DC-AC inverter therein, and described DC-AC inverter direct-flow side connects described low-voltage direct electrical network, and described DC-AC inverter AC connects low-voltage alternating-current electrical network.
Therein in an embodiment, described DC-DC isolator also comprises inverter, intermediate frequency transformer and rectifier, the DC side parallel of described inverter has described the second electric capacity, the DC side of described inverter is connected with the DC output end of described submodule, the AC of described inverter connects the former side of described intermediate frequency transformer, the AC of described rectifier connects the pair side of described intermediate frequency transformer, the DC side parallel of described rectifier has described the first electric capacity, and the DC side of described rectifier connects described low-voltage direct electrical network.
Therein in an embodiment, described DC-DC isolator also comprises inverter, intermediate frequency transformer and rectifier, described the first electric capacity, described the second electric capacity, described inverter, the number of described intermediate frequency transformer and described rectifier is a plurality of, the former side of described intermediate frequency transformer connects the AC of described inverter, the pair side of described intermediate frequency transformer connects the AC of described rectifier, the DC side parallel of described inverter has described the second electric capacity, the DC side cascade of a plurality of described inverters forms described direct-flow input end mouth, described direct-flow input end mouth is connected with the DC output end of described submodule, the DC side parallel of described rectifier has described the first electric capacity, the DC side parallel of a plurality of described rectifiers forms described DC output end mouth, described DC output end mouth is connected with described low-voltage direct electrical network.
Therein in an embodiment, described modular multi-level converter is three-phase three bridge arm circuit structures, in described three bridge arm structures, every phase brachium pontis includes brachium pontis and lower brachium pontis, described upper brachium pontis and described lower brachium pontis include a plurality of submodules and a current limiting reactor, described a plurality of submodule series connection, one end of described a plurality of submodule series connection is connected to form and exchanges port with described current limiting reactor, and the other end of described a plurality of submodule series connection forms DC port.
In an embodiment, described half-bridge circuit comprises two groups of insulated gate bipolar transistors and fly-wheel diode therein, and described two groups of insulated gate bipolar transistors and fly-wheel diode connect into half H bridge construction.
In an embodiment, described inverter comprises four groups of insulated gate bipolar transistors and fly-wheel diode therein, and described four groups of insulated gate bipolar transistors become H bridge construction to be connected with described fly-wheel diode.
In an embodiment, described rectifier comprises four groups of insulated gate bipolar transistors and fly-wheel diode therein, and described four groups of insulated gate bipolar transistors become H bridge construction to be connected with described fly-wheel diode.
In an embodiment, described DC-AC inverter comprises four groups of insulated gate bipolar transistors and fly-wheel diode therein, and described four groups of insulated gate bipolar transistors become H bridge construction to be connected with described fly-wheel diode.
The electronic power transformer of the utility model based on MMC, the DC side output capacitance of DC-DC isolator is in parallel, when there is imbalance in the DC capacitor voltage of MMC, the submodule that in MMC, capacitance voltage is high passes through DC-DC isolator by low-voltage direct electrical network, by DC-DC isolator, to the low capacitor charging of voltage, raise magnitude of voltage again, so just guarantee the stable of DC voltage, thereby realized the autobalance of the DC capacitor voltage of MMC.Generally speaking, the electronic power transformer of the utility model based on MMC is a kind of electronic power transformer based on MMC that DC voltage balance is controlled of easily realizing.
Accompanying drawing explanation
Fig. 1 is the structural representation of electronic power transformer one of them embodiment of the utility model based on MMC;
Fig. 2 is the structural representation of MMC submodule in the electronic power transformer of the utility model based on MMC;
Fig. 3 is DC-DC isolator the first structural representation in the electronic power transformer of the utility model based on MMC;
Fig. 4 is DC-DC isolator the second structural representation in the electronic power transformer of the utility model based on MMC;
Fig. 5 is the structural representation of DC-AC inverter in one of them embodiment of the electronic power transformer of the utility model based on MMC.
Embodiment
As Fig. 1, Fig. 2, shown in Fig. 3 and Fig. 4, a kind of electronic power transformer based on MMC, it is characterized in that, comprise modular multi-level converter 10O and DC-DC isolator 200, the AC of described modular multi-level converter 100 connects High-voltage AC Network, the DC side of described modular multi-level converter 100 connects described DC-DC isolator 200, described modular multi-level converter 100 comprises a plurality of submodules that are connected in series 120, the DC side of described submodule 120 is positive and negative to be connected with the positive and negative of high-voltage direct current power grid respectively, described DC-DC isolator 200 comprises the first electric capacity 210 and the second electric capacity 220, in parallel described first electric capacity 210 of direct current outlet side of described DC-DC isolator 200 forms DC output end mouth, described DC output end mouth is connected with low-voltage direct electrical network, in parallel described second electric capacity 220 of direct current input side of described DC-DC isolator 200 forms direct-flow input end mouth, described direct-flow input end mouth is connected with the DC output end of described submodule 120,
Described submodule 120 comprises half-bridge circuit and electric capacity, described half-bridge circuit and described Capacitance parallel connection.
In the present embodiment, the first electric capacity and the second electric capacity can be also different electric capacity for identical electric capacity, and what identical electric capacity was said here is the electric capacity of same model.The first Capacitance parallel connection is the DC side output capacitance as DC-DC isolator at the direct current outlet side of DC-DC isolator, the second Capacitance parallel connection at the direct current input side of DC-DC isolator as DC side input capacitance.Half-bridge circuit and Capacitance parallel connection in submodule, this electric capacity is as the DC side output capacitance of half-bridge submodule.
The electronic power transformer of the utility model based on MMC, the DC side output capacitance of DC-DC isolator is in parallel, when there is imbalance in the DC capacitor voltage of MMC, the submodule that in MMC, capacitance voltage is high passes through DC-DC isolator by low-voltage direct electrical network, by DC-DC isolator, to the low capacitor charging of voltage, raise magnitude of voltage again, so just guarantee the stable of DC voltage, thereby realized the autobalance of the DC capacitor voltage of MMC.Generally speaking, the electronic power transformer of the utility model based on MMC is a kind of electronic power transformer based on MMC that DC voltage balance is controlled of easily realizing.
Owing to there being the existence of DC-DC isolator, the high-voltage alternating of the electronic power transformer of the utility model based on MMC and DC side are in high pressure conditions in addition, and low-voltage alternating-current and DC side, in low-pressure state, have realized the perfection isolation of high-pressure system and low-pressure system.When breaking down, the contact that disconnects direct current and AC network is convenient like this, so the utility model electron electric power transformation also has, reliability is high, control is special flexibly
As shown in Figure 1, the described electronic power transformer based on MMC also comprises DC-AC inverter 300, and described DC-AC inverter 300 DC side connect described low-voltage direct electrical network, and described DC-AC inverter 300 ACs connect low-voltage alternating-current electrical network.
The direct current side joint low-voltage DC net of DC-AC inverter, exchanges side joint low-voltage AC net.The effect of this structure is that when low-voltage direct electric network source breaks down, low-voltage alternating-current electrical network can be exported direct current by inverter, accomplishes the support to low-voltage direct electrical network voltage.When normal, due to the existence of inverter, also can make the mutual support of low-voltage AC net and low-voltage direct electrical network.
As shown in Figure 3, described DC-DC isolator also comprises inverter 230, intermediate frequency transformer 240 and rectifier 250, the DC side parallel of described inverter 230 has described the second electric capacity 220, the DC side of described inverter 230 is connected with the DC output end of described submodule 120, the AC of described inverter 230 connects the former side of described intermediate frequency transformer 240, the AC of described rectifier 250 connects the pair side of described intermediate frequency transformer 240, the DC side parallel of described rectifier 250 has described the first electric capacity 210, the DC side of described rectifier 250 connects described low-voltage direct electrical network.
The present embodiment is a kind of structure of DC-DC isolator, inverter wherein, i.e. and high frequency modulated part, the direct current output of the direct current side joint MMC submodule of inverter, exchanges the former side of side joint intermediate frequency transformer; Intermediate frequency transformer, is electrically coupled to former side's high-voltage alternating the low-pressure side of pair side, realizes the electrical isolation between high-low pressure; Rectifier, i.e. high frequency reduction part, structure is the same with inverter, is all H bridge construction, exchanges the pair side of side joint intermediate frequency transformer, direct current side joint low-voltage DC net.Isolated variable is partly realized direct current is changed into after exchanging and be coupled to pair side and is reduced into direct current, adopts the pulse width modulation of open loop to control.
As shown in Figure 4, described DC-DC isolator 200 also comprises inverter 430, intermediate frequency transformer 440 and rectifier 450, described the first electric capacity 210, described the second electric capacity 220, described inverter 430, the number of described intermediate frequency transformer 440 and described rectifier 450 is a plurality of, the former side of described intermediate frequency transformer 440 connects the AC of described inverter 430, the pair side of described intermediate frequency transformer 440 connects the AC of described rectifier 450, the DC side parallel of described inverter 430 has described the second electric capacity 220, the DC side cascade of a plurality of described inverters 430 forms described direct-flow input end mouth, described direct-flow input end mouth is connected with the DC output end of described submodule 120, the DC side parallel of described rectifier 450 has described the first electric capacity 210, the DC side parallel of a plurality of described rectifiers 450 forms described DC output end mouth, described DC output end mouth is connected with described low-voltage direct electrical network.
The present embodiment is the another kind of structure of DC-DC isolator, the DC capacitor voltage of MMC is not identical in the present embodiment, what take is hybrid battery flat structure, the output voltage values of each submodule is not equal to, the structure that former side's side of intermediate frequency transformer is cascade, progression is corresponding with the size of the submodule capacitance voltage of MMC, and pair side's side of transformer is to take parallel connection.Adopt the DC-DC isolator of hybrid many level structure of the present embodiment not only can under the prerequisite that does not increase switching device and DC power supply, can export more voltage level but also can also reduce switching frequency, minimizing loss and total harmonic distortion.
Therein in an embodiment, described modular multi-level converter is three-phase three bridge arm circuit structures, in described three bridge arm structures, every phase brachium pontis includes brachium pontis and lower brachium pontis, described upper brachium pontis and described lower brachium pontis include a plurality of submodules and a current limiting reactor, one end of described a plurality of submodule series connection is connected to form and exchanges port with described current limiting reactor, and the other end of described a plurality of submodules forms DC port.
What MMC adopted in the present embodiment is three-phase MMC structure.Electrical network mesohigh AC network is connected on the AC of MMC submodule, high voltage direct current positive and negative respectively with positive and negative being connected of DC side of MMC submodule.The same in the present embodiment with traditional MMC structure, MMC has 6 brachium pontis, and each brachium pontis is to be in series by n identical half H bridge submodule and a brachium pontis inductance.The structure of single half H bridge submodule comprises two groups of insulated gate bipolar transistors and fly-wheel diode and a DC energy storage electric capacity.Each submodule has three different on off states, is respectively input, excision and blocking.Input state refers to that bridge insulated gate bipolar transistor is open-minded, and lower bridge insulated gate bipolar transistor turn-offs, and electric current always circulates by the upper bridge of half H bridge, and submodule output voltage can be thought and equals DC energy storage capacitance voltage; Excision state refers to that bridge insulated gate bipolar transistor turn-offs, and lower brachium pontis is open-minded, and electric current always circulates by the lower bridge of half H bridge, and submodule output voltage can be thought and equals 0; Blocking refers to that upper and lower brachium pontis insulated gate bipolar transistor turn-offs simultaneously, and this situation mainly occurs in system startup, fault and switch dead band stage.Converter only switches under normal operation between input and excision two states, and its upper and lower two brachium pontis are done complementary conducting.The effect of MMC is the switching by off state, can realize the control to submodule output voltage, keep total DC voltage stability simultaneously and obtain maximum VD, to meet the specification requirement of high-power flexible DC power transmission system to converter.
As shown in Figure 2, in an embodiment, described half-bridge circuit comprises two groups of insulated gate bipolar transistors and fly-wheel diode therein, and described two groups of insulated gate bipolar transistors and fly-wheel diode connect into half H bridge construction.
As shown in Figure 3 or Figure 4, in an embodiment, described inverter comprises four groups of insulated gate bipolar transistors and fly-wheel diode therein, and described four groups of insulated gate bipolar transistors become H bridge construction to be connected with described fly-wheel diode.
As shown in Figure 3 or Figure 4, in an embodiment, described rectifier comprises four groups of insulated gate bipolar transistors and fly-wheel diode therein, and described four groups of insulated gate bipolar transistors become H bridge construction to be connected with described fly-wheel diode.
As shown in Figure 5, in an embodiment, described DC-AC inverter 300 comprises four groups of insulated gate bipolar transistors and fly-wheel diode therein, and described four groups of insulated gate bipolar transistors become H bridge construction to be connected with described fly-wheel diode.
In above-mentioned several embodiment, half-bridge circuit, inverter, rectifier and DC-AC inverter all comprise four groups of insulated gate bipolar transistors and fly-wheel diode, and four groups of insulated gate bipolar transistors become H bridge construction to be connected with fly-wheel diode.H bridge construction is a kind of modular structure, in above-mentioned several embodiment, half-bridge circuit, inverter, rectifier and DC-AC inverter all adopt the H bridge construction of this module to be conducive to optimize the structure of the electronic power transformer of the utility model based on MMC, are also convenient in addition integrated, production, management and centralized control.
The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (9)
1. the electronic power transformer based on MMC, it is characterized in that, comprise modular multi-level converter and DC-DC isolator, the AC of described modular multi-level converter connects High-voltage AC Network, the DC side of described modular multi-level converter connects described DC-DC isolator, described modular multi-level converter comprises a plurality of submodules that are connected in series, the DC side of described submodule is positive and negative to be connected with the positive and negative of high-voltage direct current power grid respectively, described DC-DC isolator comprises the first electric capacity and the second electric capacity, in parallel described first electric capacity of direct current outlet side of described DC-DC isolator forms DC output end mouth, described DC output end mouth is connected with low-voltage direct electrical network, in parallel described second electric capacity of direct current input side of described DC-DC isolator forms direct-flow input end mouth, described direct-flow input end mouth is connected with the DC output end of described submodule,
Described submodule comprises half-bridge circuit and the electric capacity being connected in parallel.
2. the electronic power transformer based on MMC according to claim 1, is characterized in that, also comprises DC-AC inverter, and described DC-AC inverter direct-flow side connects described low-voltage direct electrical network, and described DC-AC inverter AC connects low-voltage alternating-current electrical network.
3. the electronic power transformer based on MMC according to claim 1 and 2, it is characterized in that, described DC-DC isolator also comprises inverter, intermediate frequency transformer and rectifier, the DC side parallel of described inverter has described the second electric capacity, the DC side of described inverter is connected with the DC output end of described submodule, the AC of described inverter connects the former side of described intermediate frequency transformer, the AC of described rectifier connects the pair side of described intermediate frequency transformer, the DC side parallel of described rectifier has described the first electric capacity, the DC side of described rectifier connects described low-voltage direct electrical network.
4. the electronic power transformer based on MMC according to claim 1 and 2, it is characterized in that, described DC-DC isolator also comprises inverter, intermediate frequency transformer and rectifier, described the first electric capacity, described the second electric capacity, described inverter, the number of described intermediate frequency transformer and described rectifier is a plurality of, the former side of described intermediate frequency transformer connects the AC of described inverter, the pair side of described intermediate frequency transformer connects the AC of described rectifier, the DC side parallel of described inverter has described the second electric capacity, the DC side cascade of a plurality of described inverters forms described direct-flow input end mouth, described direct-flow input end mouth is connected with the DC output end of described submodule, the DC side parallel of described rectifier has described the first electric capacity, the DC side parallel of a plurality of described rectifiers forms described DC output end mouth, described DC output end mouth is connected with described low-voltage direct electrical network.
5. the electronic power transformer based on MMC according to claim 1 and 2, it is characterized in that, described modular multi-level converter is three-phase three bridge arm circuit structures, in described three bridge arm structures, every phase brachium pontis includes brachium pontis and lower brachium pontis, described upper brachium pontis and described lower brachium pontis include a plurality of submodules and a current limiting reactor, described a plurality of submodule series connection, one end of described a plurality of submodule series connection is connected to form and exchanges port with described current limiting reactor, and the other end of described a plurality of submodule series connection forms DC port.
6. the electronic power transformer based on MMC according to claim 1 and 2, it is characterized in that, described half-bridge circuit comprises two groups of insulated gate bipolar transistors and fly-wheel diode, and described two groups of insulated gate bipolar transistors and fly-wheel diode connect into half H bridge construction.
7. the electronic power transformer based on MMC according to claim 3, it is characterized in that, described inverter comprises four groups of insulated gate bipolar transistors and fly-wheel diode, and described four groups of insulated gate bipolar transistors become H bridge construction to be connected with described fly-wheel diode.
8. the electronic power transformer based on MMC according to claim 4, it is characterized in that, described rectifier comprises four groups of insulated gate bipolar transistors and fly-wheel diode, and described four groups of insulated gate bipolar transistors become H bridge construction to be connected with described fly-wheel diode.
9. the electronic power transformer based on MMC according to claim 1 and 2, it is characterized in that, described DC-AC inverter comprises four groups of insulated gate bipolar transistors and fly-wheel diode, and described four groups of insulated gate bipolar transistors become H bridge construction to be connected with described fly-wheel diode.
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Address after: 510080 water Donggang 8, Dongfeng East Road, Yuexiu District, Guangzhou, Guangdong. Patentee after: Electric Power Research Institute of Guangdong Power Grid Co.,Ltd. Patentee after: HUAZHONG University OF SCIENCE AND TECHNOLOGY Address before: 510080 water Donggang 8, Dongfeng East Road, Yuexiu District, Guangzhou, Guangdong. Patentee before: ELECTRIC POWER RESEARCH INSTITUTE OF GUANGDONG POWER GRID Corp. Patentee before: HUAZHONG University OF SCIENCE AND TECHNOLOGY |
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Effective date of registration: 20210706 Address after: 510080 water Donggang 8, Dongfeng East Road, Yuexiu District, Guangzhou, Guangdong. Patentee after: Electric Power Research Institute of Guangdong Power Grid Co.,Ltd. Address before: 510080 water Donggang 8, Dongfeng East Road, Yuexiu District, Guangzhou, Guangdong. Patentee before: Electric Power Research Institute of Guangdong Power Grid Co.,Ltd. Patentee before: HUAZHONG University OF SCIENCE AND TECHNOLOGY |
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