CN103001242B - A kind of HVDC based on modularization multi-level converter holds concurrently UPFC system - Google Patents
A kind of HVDC based on modularization multi-level converter holds concurrently UPFC system Download PDFInfo
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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
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Abstract
The present invention proposes a kind of HVDC based on modularization multi-level converter to hold concurrently UPFC system, comprise current converter (1,2,11), earthed circuit (3,12) and DC transmission line (13); Current converter (1) and current converter (2) form UPFC, and current converter (1) and current converter (11) form HVDC.HVDC and UPFC of the present invention shares a current converter, saves engineering construction cost and investment, improves the utilance of equipment, is convenient to centralized management and controls.Current converter uses modular multi-level converter topological structure, has evaded the technological difficulties of devices in series, has had and be convenient to individual-phase control and modularized design, can bypass trouble unit by redundant technique, improve plant running reliability, and devices switch frequency is lower, plant running loss is less.
Description
Technical field
The present invention relates to field of power electronics, be specifically related to a kind of HVDC based on modularization multi-level converter and hold concurrently UPFC system.
Background technology
Develop rapidly under the new situation in distributed power generation, regenerative resource, intelligent power grid technology, Technology of HVDC based Voltage Source Converter is that the deficiency making up conventional high-tension HVDC Transmission Technology provides new approach.The high voltage direct current transmission of traditional employing half control device thyristor, AC needs reactive power compensator, and inverter side needs very powerful power supply to carry out active inversion, otherwise can produce commutation failure.Flexible DC power transmission adopts the voltage source converter based on turn-off device, has the ability of cut-off current, and application PWM technology carries out passive inverter, to the not requirement of receiving-end system capacity, solves the difficult problem of Traditional DC transmission of electricity to passive load point power transmission; Can independently control to gain merit, idle etc., there is good control flexibility; During trend reversion, reverse in direct current direction and DC voltage polarity is constant, convenient formation direct current multi-terminal system.
Flexible DC power transmission device adopts the voltage source converter based on turn-off device, has the ability of cut-off current, and application PWM technology carries out passive inverter, to the not requirement of receiving-end system capacity, solves the difficult problem of Traditional DC transmission of electricity to passive load point power transmission; Can independently control to gain merit, idle etc., there is good control flexibility.Its main circuit topology adopts the mode of two voltage source converter (VSC) DC side parallels, wherein a converter AC is direct or in parallel with system by transformer, DC side connects power transmission line, after arriving transmission of electricity destination, another converter AC is direct or in parallel with the system of destination by transformer.
THE UPFC (UPFC) is the FACTS device that versatility is best up to now, by means of only the change of control law, just can realize several different functions such as shunt compensation, series compensation and phase shift respectively or simultaneously.UPFC device can be regarded as STATCOM (STATCOM) device and Static Series Synchronous Compensator (SSSC) device is formed at DC side parallel, it can simultaneously and fast, independently control active power in transmission line and reactive power, thus the four quadrant running function making UPFC have STATCOM, SSSC device not possess.
UPFC device main circuit topology adopts the mode of two voltage source converters based on MMC structure (VSC) DC side parallel, wherein a converter AC is direct or in parallel with system by transformer, and another converter AC is by transformer and Cascade System.Control owing to have employed turn-off device, the output voltage of parallel inverter and series winding converter can be controlled separately.Each converter, can individual absorption or supply reactive power and active power at ac output end.
In flexible DC power transmission and UPFC, voltage source converter (VSC) adopts two level or three-level structure usually.In Large Copacity flexible DC power transmission and UPFC, VSC needs to take to turn off the voltage endurance capability that mode that power electronic device (typical device is as insulated gate bipolar transistor IGBT) connects improves device.The technological difficulties that turn-off device IGBT connects are mainly manifested in: by the impact of technical monopoly, and the IGBT device with self limiting short-circuit current characteristic is difficult to buying, and it is not deep enough that the control technology of IGBT series average-voltage is studied in theory.For reducing device output harmonic wave, need to adopt higher switching frequency, thus plant running loss is larger.These limit the application of Large Copacity flexible DC power transmission and UPFC.
Modularization multi-level converter (MMC) is a kind of novel topological structure adopting the series connection of multiple submodule, and its each phase brachium pontis is divided into brachium pontis and lower brachium pontis, and upper and lower bridge arm is followed in series to form by N number of identical submodule and an AC reactor respectively.The half-bridge structure that each submodule is made up of two insulated gate bipolar transistors (IGBT) and anti-paralleled diode thereof and electric capacity in parallel are formed.Each submodule is a two terminal device, and it can carry out the switching between full module voltage and zero module voltage simultaneously when two kinds of senses of current.MMC avoids the technological difficulties of devices in series, and output waveform is many level, effectively reduces physical switching frequency and the switching loss of switching device; Modular construction specific to MMC makes its flexible design, is beneficial to batch production; Be convenient to individual-phase control and modularized design, can bypass trouble unit by redundant technique, and then improve plant running reliability; Devices switch frequency is lower, and plant running loss is less.
Based on above feature, modularization multi-level converter is extremely adapted at using in flexible direct current power transmission system and THE UPFC (UPFC), high-power application in advantage particularly evident, by be multi-level converter of future generation main flow topology one of.
In common Practical Project, flexible DC power transmission device and UPFC independently build often and run, and which results in overlapping investment construction, cost is high, utilization rate of equipment and installations is low, manage and control problems such as not concentrating.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of flexible DC power transmission HVDC based on modularization multi-level converter to hold concurrently THE UPFC UPFC system, utilize voltage source converter DC voltage polarity constant, the convenient feature forming direct current multi-terminal system, flexible DC power transmission and UPFC share a current converter, save engineering construction cost and investment, improve the utilance of equipment, be convenient to centralized management and control.
A kind of HVDC based on modularization multi-level converter provided by the invention holds concurrently UPFC system, comprises current converter 1, current converter 2, current converter 11, earthed circuit 3, earthed circuit 12 and DC transmission line 13; Described current converter 1 comprises transformer 7, start-up circuit 5 and converter 6; Its improvements are,
Described transformer 7 former limit parallel connection access electrical network, described transformer 7 secondary is connected with described start-up circuit 5 and described converter 6 successively; After described converter 6 two ends earth circuit 3, be divided at least two branch roads, for earthed circuit 3 two ends connect, described current converter 2 is rear to be connected with described electrical network branch road one, forms one group of THE UPFC UPFC; Branch road two is be connected with electrical network after earthed circuit 3 two ends are connected with described current converter 11 by described DC transmission line 13, forms one group of flexible DC power transmission HVDC; Earth circuit 12 between described DC transmission line 13 and described current converter 11.Described transformer 7 former limit neutral ground.
Wherein, described current converter 11 comprises start-up circuit 14 and converter 15; Described start-up circuit 14 is connected between electrical network and described converter 15.Preferably, described current converter 11 can also comprise transformer 16, is arranged between described start-up circuit 14 and described electrical network, for mating of system voltage and converter 15 voltage; The described former limit of transformer 16 is in parallel with described electrical network, and its secondary is connected with described start-up circuit 14.Described transformer 16 former limit neutral ground.
Wherein, described current converter 2 comprises transformer 10, start-up circuit 8 and converter 9; The described former limit of transformer 10 is connected between described electrical network and load, and described transformer 10 secondary is connected with described start-up circuit 8 and described converter 9 successively.
Wherein, described earthed circuit 3 and 12 is ground capacity or earth resistance, for preventing electric potential floating, and fixed system current potential; The neutral ground of described ground capacity; The neutral ground of described earth resistance.
Wherein, when described earthed circuit 3 and 12 is described ground capacity, described converter 6 is made up of 3 phase, six brachium pontis, and each brachium pontis comprises 1 reactor submodule identical with Q structure; After the sub module cascade of each brachium pontis, one end is connected with described start-up circuit 5 by reactor; The other end is connected with submodule one end of the cascade of another two brachium pontis.
Wherein, when described earthed circuit 3 and 12 is described ground capacity, described converter 9 is made up of 3 phase, six brachium pontis, and each brachium pontis comprises 1 reactor submodule identical with W structure; After the sub module cascade of each brachium pontis, one end is connected with described start-up circuit 8 by reactor; The other end is connected with submodule one end of the cascade of another two brachium pontis.
Wherein, when described earthed circuit 3 and 12 is described ground capacity, described converter 15 is made up of 3 phase, six brachium pontis, and each brachium pontis comprises 1 reactor submodule identical with R structure; After the sub module cascade of each brachium pontis, one end is connected with described start-up circuit 14 by reactor; The other end is connected with submodule one end of the cascade of another two brachium pontis.
Wherein, when described earthed circuit 3 and 12 is described earth resistance, described converter 6 is made up of 3 phase, six brachium pontis, and each brachium pontis comprises 1 reactor submodule identical with N number of structure; After the sub module cascade of each brachium pontis, one end is connected with described start-up circuit 5, is connected after other end series reactor with the reactor of another two brachium pontis.
Wherein, when described earthed circuit 3 and 12 is described earth resistance, described converter 9 is made up of 3 phase, six brachium pontis, and each brachium pontis comprises 1 reactor submodule identical with M structure; After the sub module cascade of each brachium pontis, one end is connected with described start-up circuit 8, is connected after other end series reactor with the reactor of another two brachium pontis.
Wherein, when described earthed circuit 3 and 12 is described earth resistance, described converter 15 is made up of 3 phase, six brachium pontis, and each brachium pontis comprises 1 reactor submodule identical with P structure; After the sub module cascade of each brachium pontis, one end is connected with described start-up circuit 14, is connected after other end series reactor with the reactor of another two brachium pontis.
Wherein, described submodule is formed by half-bridge structure is in parallel with DC capacitor, and described half-bridge structure comprises the IGBT module of two series connection, and each IGBT module comprises antiparallel IGBT and diode;
Described half-bridge structure mid point submodule bypass circuit in parallel with between IGBT emitter;
The control circuit that described DC capacitor is submodule by draw-out power supply provides power supply.
Wherein, described start-up circuit 5,8 and 14 includes resistance in parallel and switch.
Wherein, described flexible DC power transmission HVDC can adopt two ends form or multiterminal form; Described THE UPFC UPFC can adopt two ends or multiterminal form; Described HVDC holds concurrently in UPFC system, and the positive and negative busbar (i.e. common DC bus) of HVDC is connected with the positive and negative busbar (i.e. common DC bus) of UPFC.
Compared with the prior art, beneficial effect of the present invention is:
The present invention significantly can improve installed capacity, without the need to adopting the technology of complicated IGBT device series connection;
The present invention can realize individual-phase control;
The present invention can realize modularized design;
The present invention can bypass trouble unit by redundant technique, improves plant running reliability;
For reducing output harmonic wave, IGBT device tandem plan switching frequency is usually higher, and device loss is larger; This programme have employed modular multilevel technology, and the switching frequency of each device is lower, but it is very high to realize external equivalent switching frequency, and reduce output harmonic wave, therefore plant running loss is less;
Flexible DC power transmission of the present invention and UPFC share a current converter, save engineering construction cost and investment, improve the utilance of equipment, are convenient to centralized management and control.
Accompanying drawing explanation
Fig. 1 is modularization multi-level converter MMC topology diagram (scheme one) provided by the invention.
Fig. 2 is modularization multi-level converter MMC topology diagram (scheme two) provided by the invention.
Fig. 3 is that the flexible DC power transmission HVDC based on modularization multi-level converter MMC provided by the invention holds concurrently the topological diagram (scheme one) of THE UPFC UPFC.
Fig. 4 is that the flexible DC power transmission HVDC based on modularization multi-level converter MMC provided by the invention holds concurrently the topological diagram (scheme two) of THE UPFC UPFC.
Fig. 5 is single submodular circuits figure provided by the invention.
Fig. 6 is modularization multi-level converter MMC topology diagram (scheme three) provided by the invention.
Wherein, (1) is current converter; (2) be current converter; (3) be the ground capacity in earthed circuit or earth resistance; (4) be by-pass switch; (5) be start-up circuit; (6) be converter; (7) be transformer; (8) be start-up circuit; (9) be converter; (10) be transformer; (11) be current converter; (12) be earthed circuit; (13) be DC transmission line; (14) be start-up circuit; (15) be converter; (16) be transformer.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Embodiment one
A kind of HVDC based on modularization multi-level converter that the present embodiment provides holds concurrently UPFC system, and its topological diagram as shown in Figure 3, comprises current converter 1, current converter 2, current converter 11, earthed circuit 3, earthed circuit 12 and DC transmission line 13;
Described current converter 1 one end and line series, the other end is in parallel with earthed circuit 3; Earthed circuit 3 two ends are divided at least two branch roads, and branch road one is connected with described electrical network after connecting described current converter 2, forms one group of THE UPFC UPFC; Branch road two is connected with electrical network after being connected with described current converter 11 by described DC transmission line 13, forms one group of flexible DC power transmission HVDC; Earth electric capacity 12 between described DC transmission line 13 and described current converter 11.
Wherein, each device is constructed as follows:
Described current converter 1 comprises transformer 7, start-up circuit 5 and converter 6 (converter 6 is cascade half-bridge structure voltage source converter, for flexible DC power transmission and THE UPFC share); The former limit parallel connection of described transformer 7 accesses electrical network and ground connection, and described transformer 7 secondary is connected with described start-up circuit 5 and described converter 6 successively; Described converter 6 two ends are in parallel with earthed circuit 3;
Described current converter 11 comprises start-up circuit 14 and converter 15; Described start-up circuit 14 one end and line series, the other end and described converter 15 are connected.In order to realize mating of system voltage and converter 15 voltage, arrange a transformer 16 between start-up circuit 14 and described electrical network, the described former limit of transformer 16 and ground connection in parallel with described electrical network, its secondary is connected with described start-up circuit 14.
Described current converter 2 comprises transformer 10, start-up circuit 8 and converter 9; The described electrical network of described transformer 10 former limit series connection access, described transformer 10 secondary is connected with described start-up circuit 5 and described converter 6 successively; The described former limit of transformer 10 is connected with load.
Described start-up circuit 5,8 and 14 is all for the soft start of implement device, and it includes resistance in parallel and switch.
Converter 6 is connected with the positive and negative busbar of converter 9, earth circuit 3 between positive and negative busbar, and form intermediate DC link and be connected, such active power can carry out bi-directional between two current converters; Reactive power can be exchanged with system at its AC independently by each current converter.
Described earthed circuit 3 and 12---flexible DC power transmission and THE UPFC share, and it is ground capacity or earth resistance, for preventing electric potential floating, and fixed system current potential; The neutral ground of described ground capacity; The neutral ground of described earth resistance.
When described earthed circuit 3 and 12 is described ground capacity: described converter 6 as shown in Figure 1, be made up of 3 phase, six brachium pontis, each brachium pontis comprises 1 reactor submodule identical with Q structure, after the sub module cascade of each brachium pontis, one end is connected with described start-up circuit 5 by reactor, and the other end is connected with submodule one end of the cascade of another two brachium pontis and draws direct current positive and negative busbar (as shown in the sign that marks in figure); Described converter 9 structure is identical with structure shown in Fig. 1, be made up of 3 phase, six brachium pontis, each brachium pontis comprises 1 reactor submodule identical with W structure, after the sub module cascade of each brachium pontis, one end is connected with described start-up circuit 5 by reactor, and the other end is connected with submodule one end of the cascade of another two brachium pontis and draws direct current positive and negative busbar; Described converter 15 structure is identical with structure shown in Fig. 1, and be made up of 3 phase, six brachium pontis, each brachium pontis comprises 1 reactor submodule identical with R structure; After the sub module cascade of each brachium pontis, one end is connected with described start-up circuit 5 by reactor; The other end is connected with submodule one end of the cascade of another two brachium pontis and draws direct current positive and negative busbar.Above-mentioned reactance is for suppressing convertor assembly output harmonic wave.Wherein, Q, W and R are positive integer, and the number of Q, W and R can be equal, also can not wait.When described earthed circuit 3 and 12 is described earth resistance: described converter 6 as shown in Figure 2, be made up of 3 phase, six brachium pontis, each brachium pontis comprises 1 reactor submodule identical with N number of structure, after the sub module cascade of each brachium pontis, one end is connected with described start-up circuit 5, is connected and draws direct current positive and negative busbar (as shown in the sign that marks in figure) after other end series reactor with the reactor of another two brachium pontis; Described converter 9 structure is identical with structure shown in Fig. 2, be made up of 3 phase, six brachium pontis, each brachium pontis comprises 1 reactor submodule identical with M structure, after the sub module cascade of each brachium pontis, one end is connected with described start-up circuit 5, is connected and draws direct current positive and negative busbar after other end series reactor with the reactor of another two brachium pontis; Described converter 15 structure is identical with structure shown in Fig. 2, be made up of 3 phase, six brachium pontis, each brachium pontis comprises 1 reactor submodule identical with P structure, after the sub module cascade of each brachium pontis, one end is connected with described start-up circuit 5, is connected and draws direct current positive and negative busbar after other end series reactor with the reactor of another two brachium pontis.Above-mentioned reactance for suppress from system thunder and lightning, operation ripple to the infringement of equipment.Wherein, N, M and P are positive integer, and the number of N, M and P can be equal, also can not wait.
Above-mentioned its circuit diagram of described submodule as shown in Figure 5, is formed by half-bridge structure is in parallel with DC capacitor, and described half-bridge structure comprises the IGBT module of two series connection, and each IGBT module comprises antiparallel IGBT and diode; Described half-bridge structure mid point submodule bypass circuit in parallel with between IGBT emitter; Submodule half-bridge is for exporting required voltage; Its direct current capacitor is used for providing submodule voltage support; During submodule internal fault, its bypass circuit is used for making submodule out of service, realizes STATCOM (current conversion station 1) device redundancey and runs; The control circuit that described DC capacitor is submodule by draw-out power supply provides power supply, and control circuit is for realizing control to submodule, monitoring and protection.
Described flexible DC power transmission HVDC can adopt two ends form or multiterminal form; Described THE UPFC UPFC can adopt two ends or multiterminal form; Described HVDC holds concurrently in UPFC system, and the positive and negative busbar (i.e. common DC bus) of HVDC is connected (positive pole connects positive pole, and negative pole connects negative pole) with the positive and negative busbar (i.e. common DC bus) of UPFC.
Embodiment two
The present embodiment is substantially identical with embodiment one, but distinctive points is:
The present embodiment is in order to control the access of current converter 2 and exit, and the present embodiment is a by-pass switch 4 in parallel at transformer 10 two ends, as shown in Figure 6.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of right of the present invention.
Claims (13)
1. to hold concurrently a UPFC system based on the HVDC of modularization multi-level converter, comprise current converter I (1), current converter II (2), current converter III (11), earthed circuit I (3), earthed circuit II (12) and DC transmission line (13); Described current converter I (1) comprises transformer I (7), start-up circuit I (5) and converter I (6); It is characterized in that,
Electrical network is accessed while ground connection in the former limit of described transformer I (7), and described transformer I (7) secondary is connected with described start-up circuit I (5) and described converter I (6) successively; After described converter I (6) two ends earth circuit I (3), be divided at least two branch roads, branch road one is connected with described electrical network afterwards for earthed circuit I (3) two ends connect described current converter II (2), forms one group of THE UPFC UPFC; Branch road two is be connected with electrical network after earthed circuit I (3) two ends are connected with described current converter III (11) by described DC transmission line (13), forms one group of flexible DC power transmission HVDC; Earth circuit I I (12) between described DC transmission line (13) and described current converter III (11);
Described current converter III (11) comprises start-up circuit III (14) and converter III (15); Described start-up circuit III (14) is connected between electrical network and described converter III (15);
Described current converter III (11) comprises transformer III (16), is arranged between described start-up circuit III (14) and described electrical network, for mating of line voltage and converter III (15) voltage; Electrical network is accessed while ground connection in the former limit of described transformer III (16), and its secondary is connected with described start-up circuit III (14);
Described current converter II (2) comprises transformer II (10), start-up circuit II (8) and converter II (9); The former limit of described transformer II (10) is connected between described electrical network and load, and described transformer II (10) secondary is connected with described start-up circuit II (8) and described converter II (9) successively.
2. the system as claimed in claim 1, is characterized in that, described earthed circuit I (3), earthed circuit II (12) they are ground capacity or earth resistance, for preventing electric potential floating, and fixed system current potential; The neutral ground of described ground capacity; The neutral ground of described earth resistance.
3. the system as claimed in claim 1, it is characterized in that, when described earthed circuit I (3), earthed circuit II (12) are for ground capacity, described converter I (6) is made up of 3 phase, six brachium pontis, and each brachium pontis comprises 1 reactor submodule identical with Q structure; After the sub module cascade of each brachium pontis, one end is connected with described start-up circuit I (5) by reactor; The other end is connected with the submodule other end of the cascade of another two brachium pontis.
4. the system as claimed in claim 1, it is characterized in that, when described earthed circuit I (3), earthed circuit II (12) are for ground capacity, described converter II (9) is made up of 3 phase, six brachium pontis, and each brachium pontis comprises 1 reactor submodule identical with W structure; After the sub module cascade of each brachium pontis, one end is connected with described start-up circuit II (8) by reactor; The other end is connected with the submodule other end of the cascade of another two brachium pontis.
5. the system as claimed in claim 1, it is characterized in that, when described earthed circuit I (3), earthed circuit II (12) are for ground capacity, described converter III (15) is made up of 3 phase, six brachium pontis, and each brachium pontis comprises 1 reactor submodule identical with R structure; After the sub module cascade of each brachium pontis, one end is connected with described start-up circuit III (14) by reactor; The other end is connected with the submodule other end of the cascade of another two brachium pontis.
6. the system as claimed in claim 1, it is characterized in that, when described earthed circuit I (3), earthed circuit II (12) are for earth resistance, described converter I (6) is made up of 3 phase, six brachium pontis, and each brachium pontis comprises 1 reactor submodule identical with N number of structure; After the sub module cascade of each brachium pontis, one end is connected with described start-up circuit I (5), is connected after other end series reactor with the reactor of another two brachium pontis.
7. the system as claimed in claim 1, it is characterized in that, when described earthed circuit I (3), earthed circuit II (12) are for earth resistance, described converter II (9) is made up of 3 phase, six brachium pontis, and each brachium pontis comprises 1 reactor submodule identical with M structure; After the sub module cascade of each brachium pontis, one end is connected with described start-up circuit II (8), is connected after other end series reactor with the reactor of another two brachium pontis.
8. the system as claimed in claim 1, it is characterized in that, when described earthed circuit I (3), earthed circuit II (12) are for earth resistance, described converter III (15) is made up of 3 phase, six brachium pontis, and each brachium pontis comprises 1 reactor submodule identical with P structure; After the sub module cascade of each brachium pontis, one end is connected with described start-up circuit III (14), is connected after other end series reactor with the reactor of another two brachium pontis.
9. the system as described in as arbitrary in claim 3-8, it is characterized in that, described submodule is formed by half-bridge structure is in parallel with DC capacitor, and described half-bridge structure comprises the IGBT module of two series connection, and each IGBT module comprises antiparallel IGBT and diode;
Described half-bridge structure mid point submodule bypass circuit in parallel with between IGBT emitter;
The control circuit that described DC capacitor is submodule by draw-out power supply provides power supply.
10. the system as described in as arbitrary in claim 1-8, is characterized in that, described start-up circuit I (5), start-up circuit II (8) and start-up circuit III (14) comprise resistance in parallel and switch.
11. the system as claimed in claim 1, is characterized in that, the former limit neutral ground of described transformer I (7).
12. the system as claimed in claim 1, is characterized in that, the former limit neutral ground of described transformer III (16).
13. the system as claimed in claim 1, is characterized in that, described flexible DC power transmission HVDC adopts two ends form or multiterminal form; Described THE UPFC UPFC adopts two ends or multiterminal form; Described HVDC holds concurrently in UPFC system, and the positive and negative busbar of HVDC is connected with the positive and negative busbar of UPFC.
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| CN103236693B (en) * | 2013-04-25 | 2015-05-13 | 广东电网公司电力科学研究院 | Unified electric energy quality controller |
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| CN103606911B (en) * | 2013-10-12 | 2016-05-25 | 张家港智能电力研究院有限公司 | A kind of method of excising flexible DC power transmission system DC line instantaneity short circuit grounding fault |
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