CN104917194B - Lean against back type chain static synchronous compensator - Google Patents
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Abstract
Back type chain static synchronous compensator is leaned against the present invention relates to one kind, the three-phase alternating current that connection transformer is exported to AC system is delivered to transverter after carrying out voltage conversion；Reactor assemblies in transverter provide the exchange tie of reactive power between transverter and AC system, while the impedance of inverter inside circulation can be limited by providing.The upper group of chain static synchronous compensator and the following group chain static synchronous compensator of transverter are respectively used to export total half for exchanging reactive power between transverter and AC system.Constitute by configuring upper group of chain static synchronous compensator and the following group chain static synchronous compensator and lean against back type chain static synchronous compensator, and upper group of chain static synchronous compensator and the following group chain static synchronous compensator are attached using star-connection mode, make the control strategy of transverter more simple, its capacitor voltage balance control method can be using the direct isostatic pressing for being widely used in modularization multi-level converter, and control operation is simpler.
Description
Technical field
The present invention relates to electric and electronic technical field, more particularly to one kind leans against back type chain static synchronous compensator.
Background technology
STATCOM (STATCOM) is a kind of reactive power compensator based on all-controlling power electronics device, with
SVC (SVC) is compared, and the reactive power of STATCOM outputs can be continuous in the four corner of perception to capacitive
It is adjustable, and constant idle output can be provided in the larger scope of AC system voltage pulsation.STATCOM is to solve electricity
The effective means of Force system Voltage-stabilizing Problems, is widely used in power system.
Voltage levels, the STATCOM implementations of Large Copacity are more, such as transformer multiplex and many level.Pass
The chain type STATCOM of system uses the chain type STATCOM that triangle is connected, and each mutually separate, control is flexible, and is held per phase
The voltage received all is fixed line voltage.In actual control, the chain type STATCOM connected for triangle, capacitance voltage is equal
Weighing apparatus control realizes that amount of calculation is heavy and pressure communication is larger by capacitance voltage closed-loop control.Traditional chain type STATCOM is deposited
In the shortcoming that control operation is complicated.
The content of the invention
Based on this, it is necessary in view of the above-mentioned problems, providing a kind of control operation simply leans against the synchronization of back type chain static
Compensator.
One kind leans against back type chain static synchronous compensator, including connection transformer and transverter, and the transverter includes
Reactor assemblies, upper group of chain static synchronous compensator and the following group chain static synchronous compensator, the connection transformer are used for
Connect AC system, one end of the upper group of chain static synchronous compensator and the following group chain static synchronous compensator with it is described
One end connection of reactor assemblies, the other end of the reactor assemblies or the upper group of chain static synchronous compensator and the following group
The other end of chain static synchronous compensator and the connection transformer connection, the upper group of chain static synchronous compensator is with
Group chain static synchronous compensator is connected using star-connection mode,
The connection transformer is used to be delivered to after carrying out voltage conversion to the three-phase alternating current that the AC system is exported
The transverter；It is described that the upper group of chain static synchronous compensator and the following group chain static synchronous compensator are respectively used to output
Total half for exchanging reactive power between transverter and AC system.
Above-mentioned to lean against back type chain static synchronous compensator, the three-phase alternating current that connection transformer is exported to AC system enters
Transverter is delivered to after row voltage conversion；Reactor assemblies in transverter provide reactive power between transverter and AC system
Exchange tie, while provide can limit the impedance of inverter inside circulation.Upper group of chain static synchroballistic of transverter
Device and the following group chain static synchronous compensator are respectively used to export one of total exchange reactive power between transverter and AC system
Half.Constitute by configuring upper group of chain static synchronous compensator and the following group chain static synchronous compensator and lean against back type chain static
Synchronous compensator, and upper group of chain static synchronous compensator and the following group chain static synchronous compensator entered using star-connection mode
Row connection, makes the control strategy of transverter more simple, and its capacitor voltage balance control method, which can be used, is widely used in mould
The direct isostatic pressing of block multilevel converter, compared with traditional chain static synchronous compensator, control operation is simpler.
Brief description of the drawings
Fig. 1 is to lean against the structure chart of back type chain static synchronous compensator in an embodiment；
Fig. 2 is to lean against the structure chart of back type chain static synchronous compensator in another embodiment；
Fig. 3 is the structure chart of an embodiment Neutron module.
Embodiment
One kind leans against back type chain static synchronous compensator, as depicted in figs. 1 and 2, including connection transformer 200 and the change of current
Device, transverter includes reactor assemblies 300, upper group of chain static synchronous compensator 400 and the following group chain static synchronous compensator
500, connection transformer 200 is used to connect AC system 100, upper group of chain static synchronous compensator 400 and the following group chain static
The one end of one end of synchronous compensator 500 with reactor assemblies 300 is connected, the other end of reactor assemblies 300 or upper group of chain
The other end of formula STATCOM 400 and the following group chain static synchronous compensator 500 is connected with being connected transformer 200, on
Group chain static synchronous compensator 400 and the following group chain static synchronous compensator 500 are connected using star-connection mode.
Connection transformer 200 is used to the three-phase alternating current that AC system 100 is exported be delivered to after voltage conversion to change
Flow device.Reactor assemblies 300 in transverter are used for the exchange knob for providing reactive power between transverter and AC system 100
Band, while the impedance of inverter inside circulation can be limited by providing.Upper group of chain static synchronous compensator 400 and the following group chain type are quiet
Only synchronous compensator 500 is respectively used to export total half for exchanging reactive power between transverter and AC system 100.
In one of the embodiments, connection transformer 200 is that the mode of connection is Y0/Y0Three-phase two-simulation transformer, or
Connecting transformer 200 includes 3 according to Y0/Y0The single-phase two-winding transformer of martingale, wherein, connect the net of transformer 200
Side winding neutral-point solid ground, valve side winding Neutral Grounding through Resistance in Electrical.
In another embodiment, connection transformer 200 is that the mode of connection is Y/Y0Or △/Y0Three-phase double winding transformation
Device, or connection transformer 200 include 3 according to Y/Y0Or △/Y0The single-phase two-winding transformer of martingale, wherein, connection
The valve side winding Neutral Grounding through Resistance in Electrical of transformer 200.
Both examples above provides numerous embodiments to connect the concrete structure of transformer 200, can be according to reality
Situations such as needing condition for peace is selected, and improves the applicability for leaning against back type chain static synchronous compensator.
In one of the embodiments, as shown in figure 1, the valve side of connection transformer 200 includes the first cross streams output end
A1, the second cross streams output end B1 and third phase ac output end C1, reactor assemblies 300 include the first phase reactor 320, the
Two-phase reactor 340 and third phase reactor 360.
Two Same Name of Ends LUA1, LLA1 of first phase reactor 320 intersect outflow end A1 with connecting the first of transformer 200
Connection, two non-same polarities LUA2, LLA2 of the first phase reactor 320 connect group chain static synchronous compensator 400 respectively
With the following group chain static synchronous compensator 500.Two Same Name of Ends LUB1, LLB1 of second phase reactor 340 are with being connected transformer
200 the second cross streams output end B1 connections, two non-same polarities LUB2, LLB2 of the second phase reactor 340 are connected respectively
Group chain static synchronous compensator 400 and the following group chain static synchronous compensator 500.Two of third phase reactor 360 are of the same name
The third phase ac output end C1 connections of LUC1, LLC1 with being connected transformer 200 are held, two of third phase reactor 360 are non-same
LUC2, LLC2 connect group chain static synchronous compensator 400 and the following group chain static synchronous compensator 500 respectively at name end.
Further, with continued reference to Fig. 1, in one of the embodiments, upper group of chain static synchronous compensator 400 is with
Group chain static synchronous compensator 500 includes the first phase converter valve, the second phase converter valve and third phase converter valve.
The exchange end VUA1 of first phase converter valve 420 of upper group of chain static synchronous compensator 400, and the following group chain static
The exchange end VLA1 of first phase converter valve 520 of synchroballistic 500 connects two non-same polarities of the first phase reactor 320 respectively
LUA2、LLA2.The exchange end VUB1 of second phase converter valve 440 of upper group of chain static synchronous compensator 400, and the following group chain type are quiet
Only the exchange end VLB1 of the second phase converter valve 540 of synchronous compensator 500 connect respectively two of the second phase reactor 340 it is non-same
Name end LUB2, LLB2.The exchange end VUC1 of the third phase converter valve 460 of upper group of chain static synchronous compensator 400, and the following group chain
The exchange end VLC1 of the third phase converter valve 560 of formula Static Synchronous compensation 500 connect respectively two of third phase reactor 360 it is non-
Same Name of Ends LUC2, LLC2.The DC terminal VUA2 of first phase converter valve 420 of upper group of chain static synchronous compensator 400, the second phase
Chain static is organized in the DC terminal VUB2 of converter valve 440 and the DC terminal VUC2 connections of third phase converter valve 460, composition synchronously to mend
Repay the neutral point of device 400, the DC terminal VLA2 of the first phase converter valve 520 of the following group chain static synchronous compensator 500, the second phase
The DC terminal VLB2 of converter valve 540 and the DC terminal VLC2 connections of third phase converter valve 560, constitute the following group chain static and synchronously mend
Repay the neutral point of device 500.
For the connection linked reactor component 300 of transformer 200 in the present embodiment, chain is organized in the connection of reactor assemblies 300
Formula STATCOM 400 and the following group chain static synchronous compensator 500 this annexation, to reactor assemblies 300, on
The concrete structure of group chain static synchronous compensator 400 and the following group chain static synchronous compensator 500 is explained explanation.Can
To understand, the knot of reactor assemblies 300, upper group of chain static synchronous compensator 400 and the following group chain static synchronous compensator 500
Structure and annexation each other are not unique.
In another embodiment, as shown in Fig. 2 the valve side of connection transformer 200 includes the first cross streams output terminals A 1, the
Two-phase alternating current output end B1 and third phase ac output end C1, upper group of chain static synchronous compensator 400 and the following group chain static
Synchronous compensator 500 includes the first phase converter valve, the second phase converter valve and third phase converter valve.
The exchange end VUA1 of first phase converter valve 420 of upper group of chain static synchronous compensator 400, and the following group chain static
The exchange end VLA1 of first phase converter valve 520 of synchronous compensator 500 and the first cross streams output terminals A 1 for being connected transformer 200
Connection, the DC terminal VUA2 of the first phase converter valve 420 of upper group of chain static synchronous compensator 400, and the following group chain static are same
Walk the DC terminal VLA2 linked reactors component 300 of the first phase converter valve 520 of compensator 500.Upper group of chain static is synchronously mended
Repay the exchange end VUB1 of the second phase converter valve 440 of device 400, and the following group chain static synchronous compensator 500 the second phase change of current
The exchange end VLB1 of valve 540 and the second cross streams output end B1 connections for being connected transformer 200, upper group of chain static synchroballistic
The DC terminal VUB2 of second phase converter valve 440 of device 400, and the following group chain static synchronous compensator 500 the second phase converter valve
540 DC terminal VLB2 linked reactors component 300.The third phase converter valve 460 of upper group of chain static synchronous compensator 400
Exchange end VUC1, and the third phase converter valve 560 of the following group chain static synchroballistic 500 exchange end VLC1 with being connected transformer
200 third phase ac output end C1 connections, the direct current of the third phase converter valve 460 of upper group of chain static synchronous compensator 400
Hold VUC2, and the third phase converter valve 560 of the following group chain static synchroballistic 500 DC terminal VLC2 linked reactor components
300。
Further, with continued reference to Fig. 2, in one of the embodiments, reactor assemblies 300 include the first phase reactor
320th, the second phase reactor 340 and third phase reactor 360.
Two Same Name of Ends LUA1, LLA1 of first phase reactor 320 connect group chain static synchronous compensator 400 respectively
The first phase converter valve 420 DC terminal VUA2 and the following group chain static synchronous compensator 500 the first phase converter valve 520 it is straight
Flow end VLA2.Two Same Name of Ends LUB1, LLB1 of second phase reactor 340 connect group chain static synchronous compensator respectively
The DC terminal VUB2 of 400 the second phase converter valve 440 and the second phase converter valve 540 of the following group chain static synchronous compensator 500
DC terminal VLB2.Two Same Name of Ends LUC1, LLC1 of third phase reactor 360 connect group chain static synchroballistic respectively
The DC terminal VUC2 of the third phase converter valve 460 of device 400 and the third phase converter valve of the following group chain static synchronous compensator 500
560 DC terminal VLC2.First phase reactor 320, the second phase reactor 340 and third phase reactor 360 correspond to upper group of chain
Non-same polarity LUA2, LUB2 and LUC2 of formula STATCOM 400 are connected with each other, and chain static synchroballistic is organized in composition
The neutral point of device 400, the first phase reactor 320, the second phase reactor 340 and third phase reactor 360 correspond to the following group chain type
Non-same polarity LLA2, LLB2 and LLC2 of STATCOM 500 are connected with each other, and constitute the following group chain static synchronous compensator
500 neutral point.
It is quiet for group chain static synchronous compensator 400 in the connection connection of transformer 200 and the following group chain type in the present embodiment
Only synchronous compensator 500, upper group of chain static synchronous compensator 400 and the connection reactance of the following group chain static synchronous compensator 500
This annexation of device assembly 300, to upper group of chain static synchronous compensator 400, the and of the following group chain static synchronous compensator 500
The concrete structure of reactor assemblies 300 is explained explanation.It is appreciated that upper group of chain static synchronous compensator 400, the following group
The structure of chain static synchronous compensator 500 and reactor assemblies 300 and annexation each other are not unique.
Two kinds of specific embodiments of transverter are foregoing provided, can be selected, improved according to actual conditions and demand
Lean against the applicability of back type chain static synchronous compensator.
In one of the embodiments, the first phase reactor 320, the second phase reactor 340 and third phase reactor 360 are equal
For manifold type bridge arm reactor., can be in side Equivalent conjunction reactance of not increasing exchanges, i.e., by using manifold type bridge arm reactor
Under conditions of the idle fan-out capability for not reducing STATCOM, increase the equiva lent impedance of inverter inside, by inner loop
Stream is limited in very low level, without using loop current suppression controller, simplifies on the basis of inner loop ductility limit system is ensured
Structure, so as to reduce the volume of transverter, reduction application scenarios are carried to leaning against the limitation of back type chain static synchronous compensator
High applicability.
In one of the embodiments, upper group of chain static synchronous compensator 400 and the following group chain static synchronous compensator
500 the first phase converter valve, the second phase converter valve and third phase converter valve includes identical quantity and many height being sequentially connected
Module, as depicted in figs. 1 and 2, exemplified by the first phase converter valve 420 of above group chain static synchronous compensator 400, first mutually changes
Flowing valve 420 includes submodule 1 to submodule N.Specifically as shown in figure 3, submodule includes first switch pipe Q1, second switch pipe
Q2, the 3rd switching tube Q3, the 4th switching tube Q4, direct current capacitors C, equalizing resistance R and high speed by-pass switch W.In the present embodiment
Each switching tube uses IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor), can be with
Understand, each switching tube can also use metal-oxide-semiconductor in other embodiments.
First switch pipe Q1 emitter stage (output end) connection second switch pipe Q2 colelctor electrode (input), and common port
As the first port of submodule, the 3rd switching tube Q3 the 4th switching tube Q4 of emitter stage (output end) connection colelctor electrode is (defeated
Enter end), and common port, as the second port of submodule, first switch pipe Q1 colelctor electrode (input) connects the 3rd switching tube
Q3 colelctor electrode (input), second switch pipe Q2 emitter stage (output end) connects the 4th switching tube Q4 emitter stage (output
End).One end connects the 3rd switching tube Q3 colelctor electrode (input) after direct current capacitors C and equalizing resistance R is in parallel, and the other end connects
Connect the 4th switching tube Q4 emitter stage (output end)；High speed by-pass switch W is connected between first port and second port.
Further, with continued reference to Fig. 3, in one of the embodiments, submodule also includes the first diode D1, second
Diode D2, the 3rd diode D3 and the 4th diode D4, the first diode D1 anode connection first switch pipe Q1 transmitting
Pole (output end), the first diode D1 negative electrode connection first switch pipe Q1 colelctor electrode (input).Second diode D2's
Anode connection second switch pipe Q2 emitter stage (output end), the second diode D2 negative electrode connection second switch pipe Q2 current collection
Pole (input).3rd diode D3 anode connects the 3rd switching tube Q3 emitter stage (output end), the 3rd diode D3's
Negative electrode connects the 3rd switching tube Q3 colelctor electrode (input).4th diode D4 anode connects the 4th switching tube Q4 transmitting
Pole (output end), the 4th diode D4 negative electrode connects the 4th switching tube Q4 colelctor electrode (input).
First diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4 are respectively used to corresponding
IGBT, it is to avoid triode is damaged during overtension, improves the stability for leaning against back type chain static synchronous compensator.
Above-mentioned to lean against back type chain static synchronous compensator, it is three intersecting that connection transformer 200 export to AC system 100
Stream electricity is delivered to transverter after carrying out voltage conversion；Reactor assemblies 300 in transverter provide transverter and AC system 100
Between reactive power exchange tie, while provide can limit the impedance of inverter inside circulation.Upper group of chain type of transverter
STATCOM 400 and the following group chain static synchronous compensator 500 be respectively used to output transverter and AC system 100 it
Between total half for exchanging reactive power.Synchronously mended by configuring upper group of chain static synchronous compensator 400 and the following group chain static
Repay the composition of device 500 and lean against back type chain static synchronous compensator, and upper group of chain static synchronous compensator 400 and the following group chain type are quiet
Only synchronous compensator 500 is attached using star-connection mode, makes the control strategy of transverter more simple, its capacitance voltage
Balance control method can be using the direct isostatic pressing for being widely used in modularization multi-level converter, with traditional chain static
Synchronous compensator is compared, and control operation is simpler.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and it describes more specific and detailed, but simultaneously
Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that coming for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (5)
1. one kind leans against back type chain static synchronous compensator, it is characterised in that described to change including connection transformer and transverter
Flowing device includes reactor assemblies, upper group of chain static synchronous compensator and the following group chain static synchronous compensator, and the connection becomes
Depressor is used to connect AC system, one end of the upper group of chain static synchronous compensator and the following group chain static synchronous compensator
One end with the reactor assemblies is connected, the upper group of chain static synchronous compensator and the following group chain static synchroballistic
The other end of device and the connection transformer connection, the upper group of chain static synchronous compensator and the following group chain static are synchronously mended
Device is repaid to connect using star-connection mode,
The connection transformer is described for being delivered to after the three-phase alternating current progress voltage conversion to AC system output
Transverter；The upper group of chain static synchronous compensator and the following group chain static synchronous compensator are respectively used to export the change of current
Total half for exchanging reactive power between device and AC system；
The connection transformer is that the mode of connection is Y0/Y0Three-phase two-simulation transformer, or it is described connection transformer include 3
According to Y0/Y0The single-phase two-winding transformer of martingale, wherein, the source side winding neutral point of the connection transformer directly connects
Ground, valve side winding Neutral Grounding through Resistance in Electrical；Or the connection transformer is that the mode of connection is Y/Y0Or △/Y0Three-phase it is double
Winding transformer, or the connection transformer include 3 according to Y/Y0Or △/Y0The single-phase two-winding transformer of martingale,
Wherein, the valve side winding Neutral Grounding through Resistance in Electrical of the connection transformer；
The valve side of the connection transformer includes the first cross streams output end, the second cross streams output end and output is exchanged with third phase
End, the upper group of chain static synchronous compensator and the following group chain static synchronous compensator include the first phase converter valve, second
Phase converter valve and third phase converter valve,
The upper group of chain static synchronous compensator exchanges end with the first phase converter valve of the following group chain static synchronous compensator
Connected with the first cross streams output end of the connection transformer, the upper group of chain static synchronous compensator and the following group chain type are quiet
Only the DC terminal of the first phase converter valve of synchronous compensator connects the reactor assemblies；The upper group of chain static synchroballistic
The exchange end of second phase converter valve of device and the following group chain static synchronous compensator and the second cross streams of the connection transformer
Output end is connected, the second phase converter valve of the upper group of chain static synchronous compensator and the following group chain static synchronous compensator
DC terminal connects the reactor assemblies；The 3rd of upper group of chain static synchronous compensator and the following group chain static synchronous compensator
The exchange end of phase converter valve and the third phase ac output end of the connection transformer are connected, and the upper group of chain static is synchronously mended
The DC terminal for repaying the third phase converter valve of device and the following group chain static synchronous compensator connects the reactor assemblies.
2. according to claim 1 lean against back type chain static synchronous compensator, it is characterised in that the reactor assemblies
Including the first phase reactor, the second phase reactor and third phase reactor,
Two Same Name of Ends of the first phase reactor connect group chain static synchronous compensator and the following group chain static respectively
The DC terminal of first phase converter valve of synchronous compensator；Two Same Name of Ends of the second phase reactor connect described upper group respectively
The DC terminal of second phase converter valve of chain static synchronous compensator and the following group chain static synchronous compensator；The third phase electricity
Two Same Name of Ends of anti-device connect the upper group of chain static synchronous compensator and the following group chain static synchronous compensator respectively
The DC terminal of third phase converter valve；The first phase reactor, the second phase reactor and third phase reactor correspond on described
The non-same polarity of group chain static synchronous compensator is connected with each other, and constitutes the neutrality of the upper group of chain static synchronous compensator
Point, the first phase reactor, the second phase reactor and third phase reactor correspond to the following group chain static synchroballistic
The non-same polarity of device is connected with each other, and constitutes the neutral point of the following group chain static synchronous compensator.
3. according to claim 2 lean against back type chain static synchronous compensator, it is characterised in that the first phase reactance
Device, the second phase reactor and third phase reactor are manifold type bridge arm reactor.
4. according to claim 1 lean against back type chain static synchronous compensator, it is characterised in that the upper group of chain type is quiet
Only the first phase converter valve of synchronous compensator and the following group chain static synchronous compensator, the second phase converter valve and third phase converter valve
Include identical quantity and the multiple submodule being sequentially connected, the submodule includes first switch pipe, second switch pipe, the 3rd
Switching tube, the 4th switching tube, direct current capacitors, equalizing resistance and high speed by-pass switch,
The output end of the first switch pipe connects the input of second switch pipe, and common port is used as the first of the submodule
Port, the output end of the 3rd switching tube connects the input of the 4th switching tube, and common port is used as the submodule
Second port, the input of the first switch pipe connects the input of the 3rd switching tube, the second switch pipe
Output end connects the output end of the 4th switching tube；One end connection described the after the direct current capacitors and equalizing resistance are in parallel
The input of three switching tubes, the other end connects the output end of the 4th switching tube；The high speed by-pass switch is connected to described
Between first port and second port.
5. according to claim 4 lean against back type chain static synchronous compensator, it is characterised in that the submodule is also wrapped
Include the first diode, the second diode, the 3rd diode and the 4th diode, the anode connection of first diode described the
The output end of one switching tube, the negative electrode of first diode connects the input of the first switch pipe；Two or two pole
The anode of pipe connects the output end of the second switch pipe, and the negative electrode of second diode connects the defeated of the second switch pipe
Enter end；The anode of 3rd diode connects the output end of the 3rd switching tube, the negative electrode connection of the 3rd diode
The input of 3rd switching tube；The anode of 4th diode connects the output end of the 4th switching tube, and described the
The negative electrode of four diodes connects the input of the 4th switching tube.
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| CN105896566B (en) * | 2016-06-13 | 2018-09-04 | 南方电网科学研究院有限责任公司 | A kind of chain static synchronous compensator control method and control system |
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| WO2007028349A1 (en) * | 2005-09-09 | 2007-03-15 | Siemens Aktiengesellschaft | Device for electron energy transfer |
| CN103532156B (en) * | 2013-10-31 | 2015-08-19 | 湖南大学 | A kind of STATCOM imbalance compensation control method based on modularization multi-level converter |
| CN104078909B (en) * | 2014-06-03 | 2018-03-13 | 南方电网科学研究院有限责任公司 | A kind of voltage-source type DC ice melting and static synchronous compensating device and its control method |
| CN104065290B (en) * | 2014-06-26 | 2017-01-11 | 许继电气股份有限公司 | Modular multilevel converter level number multiplication method and starting method |
| CN204156529U (en) * | 2014-10-08 | 2015-02-11 | 中国南方电网有限责任公司电网技术研究中心 | A kind of have the flexible direct current back-to-back system (CCC-0) that redundancy switches no-power compensation function |
| CN204794103U (en) * | 2015-06-29 | 2015-11-18 | 中国南方电网有限责任公司电网技术研究中心 | Static dynamic condenser device of type chain back -to -back |
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2015
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