CN203398807U - Power mixed conversion system - Google Patents
Power mixed conversion system Download PDFInfo
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- CN203398807U CN203398807U CN201320205691.XU CN201320205691U CN203398807U CN 203398807 U CN203398807 U CN 203398807U CN 201320205691 U CN201320205691 U CN 201320205691U CN 203398807 U CN203398807 U CN 203398807U
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Abstract
The utility model provides a power mixed conversion system, which comprises an MMC and a DC-DC isolator. The alternating current side of the MMC is connected with a high-voltage alternating current power grid, and the direct current side of the MMC is connected with a high-voltage direct current power grid. An anode and a cathode of the direct current input end of the DC-DC isolator are connected with an anode and a cathode of the high-voltage direct current power grid, respectively. The DC-DC isolator comprises capacitors connected in parallel at the direct current input end and the direct current output end of the DC-DC isolator, respectively. The direct current output end of the DC-DC isolator is connected with a low-voltage direct current power grid. According to the power mixed conversion system 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, parts with high capacitor voltage in the MMC charge 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 technical field of power systems, particularly relates to electric power mixing transformation system.
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 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 mixing transformation system based on 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 the general electric power mixing transformation system based on MMC the problem that is difficult for realization, a kind of electric power mixing transformation system that DC voltage balance is controlled that easily realizes is provided.
A kind of electric power mixing transformation system, comprise modular multi-level converter and DC-DC isolator, described modular multi-level converter AC connects High-voltage AC Network, the DC side of described modular multilevel converter connects high-voltage direct current power grid, described DC-DC isolator comprises the first electric capacity and the second electric capacity, the direct-flow input end of described DC-DC isolator is positive and negative connects respectively the positive and negative of described high-voltage direct current power grid, the DC output end of described DC-DC isolator connects low-voltage direct electrical network, the direct-flow input end of described DC-DC isolator is parallel with described the second electric capacity, the DC output end of described DC-DC isolator is parallel with described the first electric capacity.
In an embodiment, described electric power mixing transformation system 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 described high-voltage direct current power grid, 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 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 submodules and described current limiting reactor series connection.
Therein in an embodiment, submodule comprises half-bridge circuit and electric capacity, described half-bridge circuit and described Capacitance parallel connection described in described submodule.
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 utility model electric power mixing transformation system, the DC side output capacitance of DC-DC isolator is in parallel, when there is imbalance in the DC capacitor voltage of MMC, the part that in MMC, capacitance voltage is high is passed 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 utility model electric power mixing transformation system is a kind of system that DC voltage balance is controlled that easily realizes.
Accompanying drawing explanation
Fig. 1 is the structural representation of one of them embodiment of the utility model electric power mixing transformation system;
Fig. 2 is the structural representation of one of them embodiment of the utility model electric power mixing transformation system;
Fig. 3 is a kind of structural representation of DC-DC isolator in the utility model electric power mixing transformation system;
Fig. 4 is the sub modular structure schematic diagram of MMC in the utility model electric power mixing transformation system;
Fig. 5 is the structural representation of DC-AC inverter in one of them embodiment of the utility model electric power mixing change system.
Embodiment
As Fig. 1, shown in Fig. 3 and Fig. 4, a kind of electric power mixing transformation system, comprise modular multi-level converter 10O and DC-DC isolator 200, described modular multi-level converter 100 ACs connect High-voltage AC Network, the DC side of described modular multilevel converter 100 connects high-voltage direct current power grid, described DC-DC isolator bag 200 is drawn together the first electric capacity 210 and the second electric capacity 220, the direct-flow input end of described DC-DC isolator 200 is positive and negative connects respectively the positive and negative of described high-voltage direct current power grid, the DC output end of described DC-DC isolator 200 connects low-voltage direct electrical network, the direct-flow input end of described DC-DC isolator 200 is parallel with described the second electric capacity 220, the DC output end of described DC-DC isolator 200 is parallel with described the first electric capacity 210.
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 direct current output capacitance as DC-DC isolator at the DC output end of DC-DC isolator, the second Capacitance parallel connection at the direct-flow input end of DC-DC isolator as direct current input capacitance.
The utility model electric power mixing transformation system, the DC side output capacitance of DC-DC isolator is in parallel, when there is imbalance in the DC capacitor voltage of MMC, the part that in MMC, capacitance voltage is high is passed 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 utility model electric power mixing transformation system is a kind of electric power mixing transformation system that DC voltage balance is controlled that easily realizes.
Owing to there being the existence of DC-DC isolator, the high-voltage alternating of the utility model electric power mixing transformation system 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.Like this when breaking down, the contact that disconnects direct current and AC network is convenient, thus the utility model electric power mixing transformation system also have reliability high, control feature flexibly.
As shown in Figure 2, in an embodiment, described electric power mixing transformation system also comprises DC-AC inverter 300 therein, 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, therein in an embodiment, described DC-DC isolator 200 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 described high-voltage direct current power grid, 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.
In the present embodiment, inverter, i.e. 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 conventionally, 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.
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 submodules and described current limiting reactor series connection.
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 4, described in described submodule, submodule comprises half-bridge circuit and electric capacity, described half-bridge circuit and described Capacitance parallel connection.
As shown in Figure 4, 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.
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.
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 utility model electric power mixing transformation system, 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. an electric power mixing transformation system, it is characterized in that, comprise modular multi-level converter and DC-DC isolator, described modular multi-level converter AC connects High-voltage AC Network, the DC side of described modular multilevel converter connects high-voltage direct current power grid, described DC-DC isolator comprises the first electric capacity and the second electric capacity, the direct-flow input end of described DC-DC isolator is positive and negative connects respectively the positive and negative of described high-voltage direct current power grid, the DC output end of described DC-DC isolator connects low-voltage direct electrical network, the direct-flow input end of described DC-DC isolator is parallel with described the second electric capacity, the DC output end of described DC-DC isolator is parallel with described the first electric capacity.
2. electric power mixing transformation system 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. electric power mixing transformation system 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 described high-voltage direct current power grid, 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.
4. electric power mixing transformation system 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 submodules and described current limiting reactor series connection.
5. electric power mixing transformation system according to claim 4, is characterized in that, submodule comprises half-bridge circuit and electric capacity, described half-bridge circuit and described Capacitance parallel connection described in described submodule.
6. electric power mixing transformation system according to claim 5, 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. electric power mixing transformation system according to claim 3, 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. electric power mixing transformation system according to claim 3, 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. electric power mixing transformation system 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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| CN103208821A (en) * | 2013-04-22 | 2013-07-17 | 广东电网公司电力科学研究院 | Power mixed conversion system |
| CN104167725A (en) * | 2014-08-18 | 2014-11-26 | 国家电网公司 | DC/DC transformer suitable for high-voltage high-capacity direct-current power grid |
| US9318974B2 (en) | 2014-03-26 | 2016-04-19 | Solaredge Technologies Ltd. | Multi-level inverter with flying capacitor topology |
| CN105515401A (en) * | 2015-11-30 | 2016-04-20 | 武汉大学 | Solid state transformer in modularized multi-level structure |
| CN105515353A (en) * | 2016-01-27 | 2016-04-20 | 东南大学 | Four-port power electronic transformer based on hybrid modular multilevel converter (MMC) |
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| TWI732482B (en) * | 2020-03-09 | 2021-07-01 | 台達電子企業管理（上海）有限公司 | High-voltage dc transformation device and power system and control method thereof |
| US11239663B2 (en) | 2020-03-09 | 2022-02-01 | Delta Electronics (Shanghai) Co., Ltd. | Energy storage device and power system and control method thereof |
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| CN104167725A (en) * | 2014-08-18 | 2014-11-26 | 国家电网公司 | DC/DC transformer suitable for high-voltage high-capacity direct-current power grid |
| CN105515401A (en) * | 2015-11-30 | 2016-04-20 | 武汉大学 | Solid state transformer in modularized multi-level structure |
| CN105515353B (en) * | 2016-01-27 | 2018-06-19 | 东南大学 | The four port electric power electric transformers based on mixed type module multi-level converter |
| CN105515353A (en) * | 2016-01-27 | 2016-04-20 | 东南大学 | Four-port power electronic transformer based on hybrid modular multilevel converter (MMC) |
| CN107276429A (en) * | 2017-05-27 | 2017-10-20 | 全球能源互联网研究院 | The high potential energy feeding device and high potential energy supplying system of a kind of flow directing device |
| TWI732482B (en) * | 2020-03-09 | 2021-07-01 | 台達電子企業管理（上海）有限公司 | High-voltage dc transformation device and power system and control method thereof |
| US11239663B2 (en) | 2020-03-09 | 2022-02-01 | Delta Electronics (Shanghai) Co., Ltd. | Energy storage device and power system and control method thereof |
| US11799293B2 (en) | 2020-03-09 | 2023-10-24 | Delta Electronics (Shanghai) Co., Ltd. | High-voltage DC transformation apparatus and power system and control method thereof |
| CN117394658A (en) * | 2023-12-11 | 2024-01-12 | 国网湖北省电力有限公司 | Bipolar electric energy router and control method thereof |
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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: 20210630 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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