CN104967141A - Hybrid direct current transmission system - Google Patents
Hybrid direct current transmission system Download PDFInfo
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- CN104967141A CN104967141A CN201510371728.XA CN201510371728A CN104967141A CN 104967141 A CN104967141 A CN 104967141A CN 201510371728 A CN201510371728 A CN 201510371728A CN 104967141 A CN104967141 A CN 104967141A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- 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 invention relates to a hybrid direct current transmission system which is in a bipolar structure and comprises a positive electrode converter transformer, a positive electrode converter, a negative electrode converter transformer and a negative electrode converter. In the bipolar structure, one converter is an MMC converter composed of an MMC sub-module, and the other is an LCC converter system which is composed of at least one LCC. The hybrid direct current transmission system provided by the invention has the advantages of mature LCC-HVDC technology, low cost, VSC-HVDC commutation failure prevention, flexible control and strong expansion performance.
Description
Technical field
The present invention relates to a kind of Hybrid HVDC system, belong to technical field of HVDC transmission.
Background technology
Along with the development of Electrical Power Technology, Traditional DC transmission system is (also known as line commutation converter HVDC (High Voltage Direct Current) transmission system, Line Commutated Converter Based High Voltage Direct Current, LCC-HVDC) technology very ripe.LCC-HVDC system has been widely used in submarine cable power transmission, Large Copacity long distance power transmission and the asynchronous electrical network occasion such as interconnected back-to-back at present.But, the Inverter Station commutation failure that LCC-HVDC system also exists, cannot power to weak AC system, need to consume the defects such as a large amount of reactive powers in running, restrict its development to a certain extent.
Voltage source converter high voltage direct current transmission (Voltage Source Converter Based High Voltage Direct Current, VSC-HVDC) in recent years based on all-controlling power electronics device independently can control active reactive power because of it, there is not commutation failure, can be the favor that the plurality of advantages such as passive island with power obtain academia and industrial quarters.As the one of VSC-HVDC topology, MMC-HVDC possesses all advantages of VSC-HVDC.Meanwhile, because of the feature of MMC topological structure, MMC-HVDC system also possess switching frequency compared with low, switching loss is little, without the need to alternating current filter group and the advantage such as autgmentability is strong, this makes it can apply to the occasion of High Level DC Voltage, bulk power transmission.But MMC-HVDC system cost is expensive, effectively cannot process the shortcomings such as DC Line Fault but restricts its utilization in long distance bulk power transmission occasion.
For above-mentioned the deficiencies in the prior art, Hybrid HVDC technology becomes new study hotspot.The feature that Hybrid HVDC combine with technique traditional LC C-HVDC technology maturation, cost are low and VSC-HVDC are without commutation failure, control flexibly, expand the advantage that performance is strong, while meeting system transmission of electricity, effectively can improve the problems such as the commutation failure of current customary DC transmission of electricity receiving end, under the present situation that flexible direct current does not still possess the transmission line capability suitable with customary DC, it is a kind of configuration scheme possessed compared with hi-tech economy.But this Hybrid HVDC technology is as a brand-new technology, the research starting stage is still in current world wide, the domestic research about Hybrid HVDC technology is also started late, in currently available technology not one effectively Hybrid HVDC system to realize above-mentioned advantage.
Summary of the invention
The object of this invention is to provide a kind of Hybrid HVDC system, have simultaneously the low feature of the technology maturation of LCC-HVDC, cost and VSC-HVDC without commutation failure, control flexibly, to expand the advantage that performance is strong.
For achieving the above object, the solution of the present invention comprises a kind of Hybrid HVDC system, this Hybrid HVDC system is dipolar configuration, comprise positive pole converter transformer and positive pole converter, negative pole converter transformer and negative pole converter, in described dipolar configuration, wherein a pole converter is the MMC converter be made up of MMC submodule, the LCC inverter system that another is very made up of at least one LCC.
Brachium pontis in described MMC comprises half-bridge submodule, full-bridge submodule and/or clamper Shuangzi module.
Each brachium pontis in described MMC by half-bridge submodule and full-bridge submodule with one to one ratio cascade formed.
In the submodule of described MMC, at least one submodule is a mixing Shuangzi module, described mixing Shuangzi module comprises 4 power model: T1, T2, T3, T4 and 2 electric capacity: C1, C2, the anode of described T1 connects the anode of described T4, the negative electrode of described T2 connects the negative electrode of T3, the negative electrode of described T1 connects the anode of described T2, the negative electrode of described T4 connects the anode of described T3 by described electric capacity C2, described electric capacity C1 is connected between the tie point of described T1 and T4 and the tie point of described T2 and T3, the tie point of described T1 and T2 is a port of described mixing Shuangzi module, the tie point of described C2 and T4 is another port of described mixing Shuangzi module.
Described power model is IGBT module, and the anode of described power model is the collector electrode of IGBT module, and the negative electrode of described power model is the emitter of IGBT module.
Described Hybrid HVDC system also comprises reactive power compensator, and described reactive power compensator connects AC network.
Described Hybrid HVDC system also comprises AC filter installation, and described AC filter installation connects AC network.
The invention provides a kind of comparatively novel Hybrid HVDC system, it is not only simple and reliable for structure, and respective shortcoming can also be overcome in conjunction with the respective advantage of LCC and MMC: utilize the active reactive independent regulation ability of MMC to regulate alternating voltage, thus increase the maximum transmitted active power ability of LCC and reduce the possibility of its commutation failure; And various types of submodule can be accessed according to actual needs in MMC, control more flexible and changeable, its DC terminal can be controlled when DC side breaks down and export no-voltage, thus overcome the shortcoming that common MMC effectively cannot process DC Line Fault.
Accompanying drawing explanation
Fig. 1 is the structural representation of Hybrid HVDC system;
Fig. 2 is a kind of topological structure schematic diagram of line commutation converter LCC;
Fig. 3 is the topology diagram of module mixed type module multilevel converter MMC;
Fig. 4 is the topological structure schematic diagram of half-bridge submodule;
Fig. 5 is the topological structure schematic diagram of full-bridge submodule;
Fig. 6 is the topological structure schematic diagram of mixing Shuangzi module;
Fig. 7-1 is the first working state schematic representation under mixing submodule normal mode of operation;
Fig. 7-2 is the second working state schematic representations under mixing submodule normal mode of operation;
Fig. 7-3 is the third working state schematic representations under mixing submodule normal mode of operation;
Fig. 7-4 is the 4th kind of working state schematic representations under mixing submodule normal mode of operation;
Fig. 8-1 is the wherein a kind of working state schematic representation under mixing submodule non-blocking mode;
Fig. 8-2 is the another kind of working state schematic representations under mixing submodule non-blocking mode.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Embodiment 1
As shown in Figure 1, this Hybrid HVDC system comprises line commutation converter LCC, modularization multi-level converter MMC, converter transformer, alternating current filter group ACF, exchanges reactive power compensator group, DC flat-wave reactor, DC filter DCF.LCC and MMC forms dipolar configuration, AC network also connects alternating current filter group ACF and exchanges reactive power compensator.
Exchanging reactive power compensator can be shunt capacitor, and also can be the one in shunt reactor, static passive compensation device and compensator, it coordinates with alternating current filter group ACF, MMC, jointly for LCC provides reactive power compensation.
DC filter DCF is connected between two DC terminal of line commutation converter, the direct current negative pole end of line commutation converter is connected with the direct-flow positive pole end of modularization multi-level converter, all be serially connected with switch between the direct current negative pole end of tie point and line commutation converter and between the direct-flow positive pole end of tie point and modularization multi-level converter, and this contact is by switch MRTB ground connection.The direct-flow positive pole end of line commutation converter is the direct-flow positive pole end of this Hybrid HVDC system, the direct current negative pole end of modularization multi-level converter is the direct current negative pole end of this Hybrid HVDC system, and two direct current both positive and negative polarity circuits of this Hybrid HVDC system are all serially connected with DC flat-wave reactor.
The most basic LCC is by the three-phase bridge circuit formed based on the thyristor of half control type, but LCC can be the 6 pulse wave converters that 6 brachium pontis are formed, the 12 pulse wave converters that also can be made up of two 6 pulse wave converters, many pulse waves converter that can also be made up of multiple 6 pulse wave converters, as shown in Figure 2, the execution mode of a kind of LCC is given.That is, this LCC can be a three-phase bridge circuit the most basic, also can be combined by multiple three-phase bridge circuit and form.
As shown in Figure 2, this MMC is made up of three-phase six brachium pontis the topological structure of MMC, each brachium pontis by half-bridge topology submodule and full-bridge topology submodule with one to one ratio cascade form, each brachium pontis is all also in series with brachium pontis reactor L simultaneously.At the AC of this MMC, the ac grid system identical with LCC is successively by converter transformer and the soft AC opening resistance device and connect the three-phase bridge circuit of this MMC.
Half-bridge submodule in this MMC and full-bridge submodule are by all-controlling power electronics device as formed based on IGBT, and its topological structure as shown in Figure 3, Figure 4.
During this Hybrid HVDC system works, LCC and MMC accesses an AC system simultaneously, defines mixing Multi-infeed HVDC transmission system.During system cloud gray model, the active reactive power independent regulation ability of MMC system can be made full use of, effectively regulate ac bus voltage, increase the maximum transmitted active power ability of LCC system, reduce the temporary overvoltage of LCC system, also can reduce LCC converter commutation failure may simultaneously.When DC side breaks down, LCC system can overcome DC Line Fault by adjustment trigger phase angle, and MMC system by the control to full-bridge submodule, can realize DC side no-voltage and control, thus effectively overcome DC Line Fault.
Certainly, the topological structure of Hybrid HVDC system of the present invention is not limited to above-described embodiment, such as, by the alternating current filter group ACF that reasonably arranges in pairs or groups, coordinates MMC to control the reactive power of AC system simultaneously, thus cancels reactive power compensation device.
In above-described embodiment, the direct current negative pole end of line commutation converter is connected and ground connection with the direct-flow positive pole end of modularization multi-level converter, the direct-flow positive pole end of line commutation converter is the direct-flow positive pole end of this Hybrid HVDC system, and the direct current negative pole end of modularization multi-level converter is the direct current negative pole end of this Hybrid HVDC system; As other embodiment, the position of LCC and MMC can be exchanged, the direct-flow positive pole end of line commutation converter is connected and ground connection with the direct current negative pole end of modularization multi-level converter, the direct-flow positive pole end of modularization multi-level converter is the direct-flow positive pole end of this Hybrid HVDC system, and the direct current negative pole end of line commutation converter is the direct current negative pole end of this Hybrid HVDC system.
In above-described embodiment, MMC comprises half-bridge submodule and full-bridge submodule, and both ratios in each brachium pontis are 1:1, and as other embodiment, the allocation ratio of half-bridge submodule and full-bridge submodule can in the light of actual conditions be arranged.But also as the case may be full-bridge submodule can be changed to clamper Shuangzi module.
Embodiment 2
The difference of the present embodiment and embodiment 1 is: in the MMC in the present embodiment, has a submodule at least for mixing Shuangzi module.As shown in Figure 6, this mixing Shuangzi module comprises 4 IGBT module: T1, T2, T3, T4 and 2 electric capacity: C1, C2, the collector electrode of T1 connects the collector electrode of T4, the emitter of T2 connects the emitter of T3, the emitter of T1 connects the collector electrode of T2, the emitter of T4 connects the collector electrode of T3 by electric capacity C2, electric capacity C1 is connected between the tie point of T1 and T4 and the tie point of T2 and T3, the tie point of T1 and T2 is a port of this mixing Shuangzi module, and the tie point of C2 and T4 is another port of this mixing Shuangzi module.IGBT (T1, T2, T3, T4) all in mixing Shuangzi module is inverse parallel fly-wheel diode all, and the base stage of T1, T2, T3, T4 accepts the control signal that external equipment provides respectively.
Mixing Shuangzi module has two kinds of mode of operations, normal operation mode and non-blocking mode.In the normal operating mode, can only have at most an IGBT conducting between T1 and T2, in order to prevent electric capacity C1 short circuit, T1 and T2 all can not simultaneously conducting; An IGBT conducting can only be had at most between T3 and T4.
Mixing Shuangzi module in the normal mode of operation, there are 4 kinds of operating states, 4 kinds of running statuses under normal operation mode are as shown in Fig. 7-1 to 7-4, (1) be the current direction when T1, T3 conducting, (2) be the current direction when T1, T4 conducting, (3) be the current direction when T2, T3 conducting, (4) are the current direction when T2, T4 conducting.As shown in table 1, when T1, T3 conducting, port output voltage be two capacitance voltages and; When T1, T4 conducting, port output voltage is zero; When T2, T3 conducting, port output voltage is electric capacity C2 voltage; When T2, T4 conducting, port output voltage is the reverse voltage of electric capacity C1, is output negative voltage.The sense of current does not affect port output voltage.In table 1, Usm represents submodule port output voltage.
Table 1
From the normal mode of operation of mixing Shuangzi module, this submodule can export 4 kinds of voltages, is respectively twice capacitance voltage, capacitance voltage, no-voltage and negative sense capacitance voltage.While illustrating that this submodule can replace 2 half-bridge submodules to export 2 times of capacitance voltages, possess the negative voltage characteristic of full-bridge submodule, direct voltage utilance can be improved, capacity.
Mixing Shuangzi module is under non-blocking mode, and have 2 kinds of operating states, 2 kinds of running statuses under non-blocking mode are as shown in Fig. 8-1 and 8-2.In the lockout condition, all IGBT are all in off state.When flowing through forward current (sense of current is by A to B), port output voltage be two capacitance voltages and; When flowing through negative current, port output voltage is the negative voltage of electric capacity C1, namely reverse with electric current voltage.
Two capacitors of mixing Shuangzi inside modules can these two capacitance voltages of reasonable disposition be different value as required.Under which, effectively can expand the range of application of affiliated MMC, such as, two capacitance voltages in reasonable disposition submodule are to realize possessing STATCOM operation troubles ride-through capability while this MMC improves modulation degree.
Be exactly in addition, submodule in MMC can be all this mixing Shuangzi module, can also be following situation: the brachium pontis in MMC is by mixing submodule and other one or several existing submodule (half-bridge submodule, full-bridge submodule, clamper Shuangzi module) cascade is formed, so, this MMC is hybrid MMC converter.This hybrid MMC converter has a wide range of applications when in the light of actual conditions expanding, while improving modulation degree, possess STATCOM operation troubles ride-through capability, saving system hardware cost etc.
In above-described embodiment, power model is IGBT module, as other embodiment, power model this can be other wholly-controled device.
Be presented above concrete execution mode, but the present invention is not limited to described execution mode.Basic ideas of the present invention are above-mentioned basic scheme, and for those of ordinary skill in the art, according to instruction of the present invention, designing the model of various distortion, formula, parameter does not need to spend creative work.The change carried out execution mode without departing from the principles and spirit of the present invention, amendment, replacement and modification still fall within the scope of protection of the present invention.
Claims (7)
1. a Hybrid HVDC system, this Hybrid HVDC system is dipolar configuration, comprise positive pole converter transformer and positive pole converter, negative pole converter transformer and negative pole converter, it is characterized in that, in described dipolar configuration, wherein a pole converter is the MMC converter be made up of MMC submodule, the LCC inverter system that another is very made up of at least one LCC.
2. Hybrid HVDC system according to claim 1, is characterized in that, the brachium pontis in described MMC comprises half-bridge submodule, full-bridge submodule and/or clamper Shuangzi module.
3. Hybrid HVDC system according to claim 2, is characterized in that, each brachium pontis in described MMC by half-bridge submodule and full-bridge submodule with one to one ratio cascade formed.
4. Hybrid HVDC system according to claim 1, it is characterized in that, in the submodule of described MMC, at least one submodule is a mixing Shuangzi module, described mixing Shuangzi module comprises 4 power model: T1, T2, T3, T4 and 2 electric capacity: C1, C2, the anode of described T1 connects the anode of described T4, the negative electrode of described T2 connects the negative electrode of T3, the negative electrode of described T1 connects the anode of described T2, the negative electrode of described T4 connects the anode of described T3 by described electric capacity C2, described electric capacity C1 is connected between the tie point of described T1 and T4 and the tie point of described T2 and T3, the tie point of described T1 and T2 is a port of described mixing Shuangzi module, the tie point of described C2 and T4 is another port of described mixing Shuangzi module.
5. Hybrid HVDC system according to claim 4, is characterized in that, described power model is IGBT module, and the anode of described power model is the collector electrode of IGBT module, and the negative electrode of described power model is the emitter of IGBT module.
6. Hybrid HVDC system according to claim 1, is characterized in that, described Hybrid HVDC system also comprises reactive power compensator, and described reactive power compensator connects AC network.
7. Hybrid HVDC system according to claim 1, is characterized in that, described Hybrid HVDC system also comprises AC filter installation, and described AC filter installation connects AC network.
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| PCT/CN2016/085610 WO2016206547A1 (en) | 2015-06-26 | 2016-06-13 | Hybrid direct current transmission system |
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2015
- 2015-06-26 CN CN201510371728.XA patent/CN104967141B/en active Active
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2016
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| WO2016206547A1 (en) * | 2015-06-26 | 2016-12-29 | 许继电气股份有限公司 | Hybrid direct current transmission system |
| CN105281314A (en) * | 2015-10-12 | 2016-01-27 | 国家电网公司 | DC power transmission system based on modularized multi-level converter unit |
| CN105449637A (en) * | 2015-12-01 | 2016-03-30 | 许继电气股份有限公司 | HCM3000 platform-based centralized alternating-current filter protection method |
| WO2017190291A1 (en) * | 2016-05-04 | 2017-11-09 | Abb Schweiz Ag | Power conversion circuit, power system and method therefor |
| CN105932706B (en) * | 2016-05-31 | 2018-07-06 | 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 | A kind of control method for coordinating for improving mixing back-to-back DC system |
| CN105932706A (en) * | 2016-05-31 | 2016-09-07 | 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 | Coordinated control method for improving hybrid back-to-back DC system |
| CN106385045A (en) * | 2016-10-13 | 2017-02-08 | 全球能源互联网研究院 | Offshore platform power supply system and control method thereof |
| CN106385045B (en) * | 2016-10-13 | 2020-01-17 | 全球能源互联网研究院 | Offshore platform power supply system and control method thereof |
| CN106787882A (en) * | 2017-01-18 | 2017-05-31 | 国家电网公司 | A kind of MMC submodules for improving transient overvoltage tolerance |
| CN106787882B (en) * | 2017-01-18 | 2023-06-23 | 国家电网公司 | MMC submodule capable of improving transient overvoltage tolerance |
| CN106849696A (en) * | 2017-02-03 | 2017-06-13 | 许继集团有限公司 | One kind mixing Shuangzi module MMC pressure equalizing control methods and device |
| CN106849696B (en) * | 2017-02-03 | 2019-02-01 | 许继集团有限公司 | A kind of mixing Shuangzi module MMC pressure equalizing control method and device |
| CN106998151A (en) * | 2017-04-21 | 2017-08-01 | 上海交通大学 | Multilevel converter based on asymmetric Shuangzi module and half-bridge submodule |
| CN107104437B (en) * | 2017-05-04 | 2019-08-23 | 国电南瑞科技股份有限公司 | The reactive coordination control method of DC converter station alternating current filter and phase modifier |
| CN107104437A (en) * | 2017-05-04 | 2017-08-29 | 国电南瑞科技股份有限公司 | The reactive coordination control method of DC converter station alternating current filter and phase modifier |
| CN107846036A (en) * | 2017-11-02 | 2018-03-27 | 南方电网科学研究院有限责任公司 | High-voltage flexible direct-current transmission system and main loop equipment determination method thereof |
| CN107846036B (en) * | 2017-11-02 | 2019-12-31 | 南方电网科学研究院有限责任公司 | High-voltage flexible direct-current transmission system and main loop equipment determination method thereof |
| CN107953803A (en) * | 2017-12-25 | 2018-04-24 | 西南交通大学 | Flexible direct current tractive power supply system and its control method are pressed in one kind |
| CN108574286A (en) * | 2018-05-09 | 2018-09-25 | 华中科技大学 | The idle work optimization and fault ride-through method of mixed type transverter MMC-PLUS |
| CN109586328A (en) * | 2018-11-20 | 2019-04-05 | 国网重庆市电力公司电力科学研究院 | Trend can two-way flow economical single-ended cascade Hybrid HVDC system |
| CN110247415A (en) * | 2019-05-09 | 2019-09-17 | 华北电力大学 | A kind of MMC-LCC type DC transmission system topology sent out suitable for wind-powered electricity generation |
| CN111817336A (en) * | 2020-07-30 | 2020-10-23 | 许昌许继软件技术有限公司 | Control method of direct current transmission system |
| CN111817336B (en) * | 2020-07-30 | 2023-08-11 | 许昌许继软件技术有限公司 | Control method of direct current transmission system |
| CN114499239A (en) * | 2022-01-29 | 2022-05-13 | 清华大学 | DC power transmission hybrid converter and control method thereof |
| CN114499239B (en) * | 2022-01-29 | 2024-08-27 | 清华大学 | DC power transmission hybrid converter and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104967141B (en) | 2017-12-26 |
| WO2016206547A1 (en) | 2016-12-29 |
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