CN102969708B - Flow controller between a kind of line based on modular multilevel converter structure - Google Patents

Flow controller between a kind of line based on modular multilevel converter structure Download PDF

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Publication number
CN102969708B
CN102969708B CN201210267169.4A CN201210267169A CN102969708B CN 102969708 B CN102969708 B CN 102969708B CN 201210267169 A CN201210267169 A CN 201210267169A CN 102969708 B CN102969708 B CN 102969708B
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China
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converter
series
brachium pontis
circuit
transformer
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CN102969708A (en
Inventor
王宇红
王轩
王柯
吴倩
戴朝波
张宇
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State Grid Corp of China SGCC
Shanghai Municipal Electric Power Co
China EPRI Science and Technology Co Ltd
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State Grid Corp of China SGCC
Shanghai Municipal Electric Power Co
China EPRI Science and Technology Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/10Flexible AC transmission systems [FACTS]
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40Arrangements for reducing harmonics

Abstract

The present invention relates to flow controller between a kind of line based on modular multilevel converter structure.Between line, flow controller comprises STATCOM (1) and Static Series Synchronous Compensator (2); STATCOM (1) comprises converter (7) and shunt transformer (8); Static Series Synchronous Compensator (2) comprises converter (9) and series transformer (10); Converter (7) is by shunt transformer (8) parallel connection access transmission line I; Converter (9) is by series transformer (10) series connection access transmission line II; THE UPFC comprises by-pass switch (4); Described by-pass switch (4) is in parallel with described series transformer (10).Between this line, flow controller has evaded the technological difficulties of devices in series, is convenient to individual-phase control and modularized design; Can bypass trouble unit by redundant technique, improve plant running reliability; And devices switch frequency is low, plant running loss is little.

Description

Flow controller between a kind of line based on modular multilevel converter structure
Technical field
Flow controller between the line that the present invention relates to a kind of Survey of Flexible AC Transmission System field, is specifically related to flow controller between a kind of line based on modular multilevel converter structure.
Background technology
Between line, flow controller (IPFC) is that the later development of power application electronic technology and modern control technology realize the parameter of AC multi-line transmission system and controlling fast flexibly of network configuration.Its feature is exactly that its flexibility can adapt to the requirement that complication system carries out a series of compensation and power flowcontrol.It can complete single circuit independently comprehensive compensation, can also carry out meritorious transmission between multiple circuit.
IPFC 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 different circuit and reactive power, thus the four quadrant running function making IPFC have STATCOM, SSSC device not possess.
IPFC device main circuit topology adopts the mode of two voltage source converter (VSC) DC side parallels, wherein AC side of converter directly or by a lines in parallel in transformer and system, another AC side of converter is connected with another circuit in system by transformer.Each voltage source converter adopts two level or three-level three-phase voltage source converter structure usually.
In Large Copacity IPFC, voltage source converter usually adopts and can 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 comparatively large, and these limit the application of Large Copacity IPFC.
Summary of the invention
For the deficiencies in the prior art, the invention provides flow controller between a kind of line based on modular multilevel converter structure, between this line, flow controller has evaded the technological difficulties of devices in series, has following features: 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 low, plant running loss is little.
The object of the invention is to adopt following technical proposals to realize:
Based on modular multilevel converter structure line between a flow controller, its improvements are, between described line, flow controller comprises STATCOM 1 and Static Series Synchronous Compensator 2;
Described STATCOM 1 comprises converter 7 and shunt transformer 8;
Described Static Series Synchronous Compensator 2 comprises converter 9 and series transformer 10;
Described converter 7 is by shunt transformer 8 parallel connection access transmission line I; Described converter 9 is connected in access transmission line II by series transformer 10;
Described THE UPFC comprises by-pass switch 4; Described by-pass switch 4 is in parallel with described series transformer 10.
Wherein, Support Capacitor 3 is set between described STATCOM 1 and described Static Series Synchronous Compensator 2; Described Support Capacitor 3 is in parallel with described STATCOM 1 and described Static Series Synchronous Compensator 2 respectively.
Wherein, described STATCOM 1 comprises start-up circuit 5; Described start-up circuit 5 is connected with the secondary of described shunt transformer 8, and the former limit of described shunt transformer 8 is in parallel with transmission line I.
Wherein, described start-up circuit 5 comprises resistance in parallel and switch.
Wherein, described Static Series Synchronous Compensator 2 comprises start-up circuit 6; Described start-up circuit 6 one end is connected with described converter 9; Described start-up circuit 6 other end is connected with described series transformer 10.
Wherein, described start-up circuit 6 comprises resistance in parallel and switch.
Wherein, described series transformer 10 connects in load in series access transmission line II.
Wherein, described converter 7 is made up of three-phase six brachium pontis, and each brachium pontis comprises the 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 by reactor; The other end is connected with submodule one end of the cascade of another two brachium pontis, forms the both positive and negative polarity bus of described converter 7; Or
Described converter 7 is made up of three-phase six brachium pontis, and each brachium pontis comprises the 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, forms described converter 7 both positive and negative polarity bus.
Wherein, 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 series transformer 10 by reactor; The other end is connected with submodule one end of the cascade of another two brachium pontis, forms described converter 9 both positive and negative polarity bus, is connected with the both positive and negative polarity bus of described converter 7; Or
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 series transformer 10; Be connected with the reactor of another two brachium pontis after other end series reactor, form described converter 9 both positive and negative polarity bus, be connected with the both positive and negative polarity bus of described converter 7.
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.
Compared with the prior art, the beneficial effect that the present invention reaches is:
1, flow controller between the line based on modular multilevel converter structure provided by the invention, significantly can improve installed capacity, without the need to adopting complicated IGBT device serial connection technology;
2, flow controller between the line based on modular multilevel converter structure provided by the invention, can realize individual-phase control;
3, flow controller between the line based on modular multilevel converter structure provided by the invention, can realize modularized design;
4, flow controller between the line based on modular multilevel converter structure provided by the invention, can bypass trouble unit by redundant technique, improves plant running reliability, avoids device and exit frequently and input;
5, flow controller between the line based on modular multilevel converter structure provided by the invention, be reduce 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.
Accompanying drawing explanation
Fig. 1 is flow controller basic circuit structure figure between the line based on modular multilevel converter structure provided by the invention;
Fig. 2 is the structure chart of flow controller main circuit scheme one between the line based on modular multilevel converter structure provided by the invention;
Fig. 3 is the structure chart of flow controller main circuit scheme two between the line based on modular multilevel converter structure provided by the invention;
Fig. 4 is the structure chart of flow controller submodule between the line based on modular multilevel converter structure provided by the invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Between the line based on modular multilevel converter structure provided by the invention, flow controller basic circuit structure figure as shown in Figure 1, comprises STATCOM 1 and Static Series Synchronous Compensator 2; STATCOM 1 comprises converter 7 and shunt transformer 8; Static Series Synchronous Compensator 2 comprises converter 9 and series transformer 10; Converter 7 is by shunt transformer 8 parallel connection access transmission line I; Described converter 9 is connected in access transmission line II by series transformer 10.
Embodiment 1
A kind of convertible static compensator based on modular multilevel converter structure that the present embodiment provides as shown in Figure 2, comprises STATCOM 1 and Static Series Synchronous Compensator 2; STATCOM 1 comprises converter 7 and shunt transformer 8; Static Series Synchronous Compensator 2 comprises converter 9 and series transformer 10;
Converter 7 is made up of three-phase six brachium pontis, and six bridge arm structures are identical, and each brachium pontis comprises 1 reactor and N (N the is natural number) submodule that individual structure is identical; Be connected with described start-up circuit 5 by reactor after described sub module cascade; Concrete, the half-bridge structure mid point of submodule and lower pipe IGBT emitter are respectively as submodule exit, successively with the module-cascade of front and back, again with reactor 1 brachium pontis in series, upper and lower two brachium pontis series connection, form 1 phase current converter, 3 phase current converters are overall in parallel, and draw converter 7 positive and negative busbar.Upper and lower bridge arm midpoint as the output of STATCOM, namely after submodule series reactor in parallel with start-up circuit 5 after access transmission line I.Start-up circuit 5 comprises resistance in parallel and switch.
Converter 9 is identical with converter 7 structure, is made up of three-phase six brachium pontis, and each brachium pontis comprises 1 reactor and M (M is natural number, and M can equal N, also can the be not equal to N) submodule that individual structure is identical; By being connected with load after reactor, series transformer 10 after sub module cascade.The positive and negative busbar of converter 7 is connected with the positive and negative busbar correspondence of converter 9.The submodule of the present embodiment is connected with system by reactor, can to suppress on the one hand from the thunder and lightning of electrical network, operation ripple, to the infringement of equipment, can suppress current converter output harmonic wave on the other hand.
Series transformer 10 connects in load in series access transmission line II.
Preferably, the present embodiment arranges Support Capacitor 3 between described STATCOM 1 and described Static Series Synchronous Compensator 2; Support Capacitor 3 in parallel between the positive and negative busbar of converter 7 and the positive and negative busbar of converter 9.Two current converters are connected by the intermediate DC link be made up of Support Capacitor 3, and 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.
Preferably, the secondary of the shunt transformer 8 of the STATCOM 1 of the present embodiment is connected with start-up circuit 5, in the former limit parallel connection access transmission line I of shunt transformer 8.Shunt transformer 8 is for realizing mating of line voltage and STATCOM output voltage.
Preferably, the Static Series Synchronous Compensator 2 of the present embodiment can also comprise start-up circuit 6, and start-up circuit 6 is made up of the resistance of parallel connection and switch.Start-up circuit 6 one end is connected with converter 9, and the other end is connected with series transformer 10 one end, in series transformer 10 other end series connection access transmission line II.Start-up circuit 6 can realize converter 9 smooth starting.Series transformer 10 is for realizing mating of line voltage and Static Series Synchronous Compensator output voltage.
Preferably, the THE UPFC of the present embodiment, in order to security setting, is also provided with by-pass switch 4, and by-pass switch 4 is in parallel with series transformer 10, for realizing exiting of Static Series Synchronous Compensator.
The submodule of the present embodiment is for exporting required voltage, between the line based on modular multilevel converter structure provided by the invention, the structure of flow controller submodule as shown in Figure 4, it is made up of half-bridge structure and DC capacitor, described half-bridge structure comprises the IGBT module of upper and lower two series connection, parallel connection direct electric capacity between upper pipe IGBT collector electrode and lower pipe IGBT emitter, submodule bypass circuit in parallel between half-bridge structure mid point with lower pipe IGBT emitter, draw-out power supply is from direct current capacitor power taking, and the control circuit for submodule provides control power supply.The DC capacitor of submodule is used for providing submodule voltage support.During submodule internal fault, its bypass circuit is used for making submodule out of service, realizes the redundancy running of STATCOM.Draw-out power supply is used for providing control power supply to submodule control circuit.Control circuit is for realizing control to submodule, monitoring and protection.The bypass circuit of the present embodiment can be realized by switch, and control circuit can be realized by numeral or analog circuit.Draw-out power supply can referenced patent 201010624225.6 or ZL201020700480.X realization.
Embodiment 2
The present embodiment is substantially the same manner as Example 1, but distinctive points is:
Converter 7 is different with the position of the reactor in converter 9.The reactor of the present embodiment is connected on converter 7 and converter 9 positive and negative busbar side, as shown in Figure 3.It is for suppressing current converter output harmonic wave.
Concrete, converter 7 is made up of three-phase six brachium pontis, and each brachium pontis comprises the 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, forms converter 7 both positive and negative polarity bus.
Converter 9 is made up of three-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 series transformer 10; Be connected with the reactor of another two brachium pontis after other end series reactor, form converter 9 both positive and negative polarity bus, be connected with the both positive and negative polarity bus of converter 7.
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 (5)

1. based on modular multilevel converter structure line between a flow controller, it is characterized in that, between described line, flow controller comprises STATCOM (1) and Static Series Synchronous Compensator (2);
Described STATCOM (1) comprises the first converter (7) and shunt transformer (8);
Described Static Series Synchronous Compensator (2) comprises the second converter (9) and series transformer (10);
Described first converter (7) is by shunt transformer (8) parallel connection access transmission line I; Described second converter (9) is by series transformer (10) series connection access transmission line II;
Between described line, flow controller comprises by-pass switch (4); Described by-pass switch (4) is in parallel with described series transformer (10);
Described STATCOM (1) comprises the first start-up circuit (5); Described first start-up circuit (5) is connected with the secondary of described shunt transformer (8), and the former limit of described shunt transformer (8) is in parallel with transmission line I;
Described first start-up circuit (5) comprises resistance in parallel and switch;
Described series transformer (10) connects in load in series access transmission line II;
Described first converter (7) is made up of three-phase six brachium pontis, and each brachium pontis comprises the reactor submodule identical with N number of structure; After the sub module cascade of each brachium pontis, one end is connected with described first start-up circuit (5) by reactor; The other end is connected with submodule one end of the cascade of another two brachium pontis, forms the both positive and negative polarity bus of described first converter (7); Or
Described first converter (7) is made up of three-phase six brachium pontis, and each brachium pontis comprises the reactor submodule identical with N number of structure; After the sub module cascade of each brachium pontis, one end is connected with described first start-up circuit (5), is connected after other end series reactor with the reactor of another two brachium pontis, forms described first converter (7) both positive and negative polarity bus;
Described second 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 series transformer (10) by reactor; The other end is connected with submodule one end of the cascade of another two brachium pontis, forms described second converter (9) both positive and negative polarity bus, is connected with the both positive and negative polarity bus of described first converter (7); Or
Described second 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 series transformer (10); Be connected with the reactor of another two brachium pontis after other end series reactor, form described second converter (9) both positive and negative polarity bus, be connected with the both positive and negative polarity bus of described first converter (7).
2. flow controller between line as claimed in claim 1, is characterized in that, arrange Support Capacitor (3) between described STATCOM (1) and described Static Series Synchronous Compensator (2); Described Support Capacitor (3) is in parallel with described STATCOM (1) and described Static Series Synchronous Compensator (2) respectively.
3. flow controller between line as claimed in claim 1, it is characterized in that, described Static Series Synchronous Compensator (2) comprises the second start-up circuit (6); Described second start-up circuit (6) one end is connected with described second converter (9); Described second start-up circuit (6) other end is connected with described series transformer (10).
4. flow controller between line as claimed in claim 3, it is characterized in that, described second start-up circuit (6) comprises resistance in parallel and switch.
5. flow controller between line as claimed in claim 1, 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.
CN201210267169.4A 2012-07-13 2012-07-13 Flow controller between a kind of line based on modular multilevel converter structure Active CN102969708B (en)

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CN103972887B (en) * 2014-05-19 2017-07-18 南京南瑞继保电气有限公司 A kind of THE UPFC suitable for double-circuit line
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CN104134998B (en) 2014-08-05 2018-02-16 南京南瑞继保电气有限公司 A kind of starting method of SSSC and stoppage in transit method
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