CN202949227U - Convertible static compensator employing modularization multi-level converter structure - Google Patents
Convertible static compensator employing modularization multi-level converter structure Download PDFInfo
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- CN202949227U CN202949227U CN2012203749704U CN201220374970U CN202949227U CN 202949227 U CN202949227 U CN 202949227U CN 2012203749704 U CN2012203749704 U CN 2012203749704U CN 201220374970 U CN201220374970 U CN 201220374970U CN 202949227 U CN202949227 U CN 202949227U
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- 238000013461 design Methods 0.000 abstract description 3
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- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
Abstract
The utility model relates to a convertible static compensator employing a modularization multi-level converter structure. The convertible static compensator comprises a static synchronization compensator, a static synchronization series compensator, and a series transformer (12). The static synchronization compensator includes a converter (7) and a transformer; and the static synchronization series compensator includes a converter (9), a series transformer (10) and a change-over switch. One end of the converter (7) is connected in parallel to a power transmission circuit I by a shunt transformer (8); the other end of the converter (7) is connected with one end of the converter (9); the other end of the converter (9) is connected to a power transmission circuit II successively through the change-over switch and the series transformer (10); and the series transformer (12) is connected in series to the power transmission circuit I. According to the scheme provided by the utility model, the technical difficulty of series connection of devices can be solved, so that the phase-splitting controlling and the modularization design can be realized conveniently; the redundancy technology is used to realize fault unit bypassing, thereby improving the reliability of the device running; and the frequency of the device switch is low and the loss of the device running is low.
Description
Technical field
The utility model relates to the static compensator in a kind of Survey of Flexible AC Transmission System field, is specifically related to a kind of convertible static compensator that adopts modular multilevel converter structure.
Background technology
Along with the development of Survey of Flexible AC Transmission System (FACTS) technology, a series of controllers with new topological structure have appearred.Convertible static compensator (Convertible Static Compensator, CSC) is exactly a kind of brand-new FACTS control device of releasing in recent years.This device combines achievement in research and the operating experience of the existing series and parallel controller that comprises THE UPFC, change by the coupling transformer connected mode realizes the various combination to several voltage source converters, with the optimal controller structure, answering system changes flexibly, is the controller that exchanges flexibly latest generation in electrical power trans mission/distribution system.
Convertible static compensator (CSC) is a kind of new product of the nearest FACTS controller of releasing, it is actually the series and parallel device technology based on the synchronous converter device, by structurally realizing flexibility, make it can tackle more neatly the electric power system requirement of continuous variation.CSC is comprised of with transformer and two transformers of connecting of power transmission line parallel-connection two voltage source converters, one.Realize the difference operation operating state of compensator by the conversion of switch, according to the difference of controlling target, CSC can provide STATCOM, Static Series Synchronous Compensator, any combination of 4 kinds of basic control modes of flow controller and aforesaid way between THE UPFC and line, and conversion mutually.
In large capacity C SC device, the mode that the common employing of voltage source converter can be turn-offed power electronic device (typical device such as insulated gate bipolar transistor IGBT) series connection improves the voltage endurance capability of device.The technological difficulties of turn-off device IGBT series connection are mainly manifested in: be subjected to the impact of technical monopoly, 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 the device output harmonic wave, need to adopt higher switching frequency, thereby the device running wastage is larger.These have limited the application of large capacity C SC.
The utility model content
For the deficiencies in the prior art, the convertible static compensator of the employing modular multilevel converter structure that the utility model provides, the technological difficulties of having avoided device to connect are convenient to minute phase control and modularized design, but by redundant technique bypass trouble unit, improve the device operational reliability; And the devices switch frequency is low, and the device running wastage is little.
The purpose of this utility model is to adopt following technical proposals to realize:
A kind of convertible static compensator that adopts modular multilevel converter structure, its improvements be, described convertible static compensator comprises STATCOM 1, Static Series Synchronous Compensator 2 and series transformer 12;
Described STATCOM 1 comprises converter 7 and start-up circuit 5;
Described Static Series Synchronous Compensator 2 comprises converter 9, series transformer 10 and change over switch 11;
Described converter 7 one ends are by in start-up circuit 5 access transmission line in parallel I; The other end of described converter 7 is connected with an end of converter 9;
The other end of described converter 9 is successively by in change over switch 11 and series transformer 10 series connection access transmission line II;
In described series transformer 12 series connection access transmission line I.
Wherein, between described STATCOM 1 and described Static Series Synchronous Compensator 2, Support Capacitor 3 is set; Described Support Capacitor 3 is in parallel with described STATCOM 1 and described Static Series Synchronous Compensator 2 respectively.
Wherein, described STATCOM 1 comprises shunt transformer 8, shunt transformer 14 and change over switch 15; One end of described converter 7 is successively by in start-up circuit 5, change over switch 15 and shunt transformer 8 access transmission line in parallel I;
In described shunt transformer 14 access transmission line in parallel II.
Wherein, described start-up circuit 5 comprises resistance and switch in parallel.
Wherein, in the former limit of described shunt transformer 8 access in parallel transmission line I, described shunt transformer 8 secondary are connected with change over switch 15 1 ends.
Wherein, described change over switch 15 other ends are connected with start-up circuit 5; Described change over switch 15 comprises contact 1 ', contact 2 ' and contact 3 ';
In 1 ' and the 3 ' contact of described start-up circuit 5 by change over switch 15 and shunt transformer 8 access in parallel transmission line I;
In 2 ' and the 3 ' contact of described start-up circuit 5 by change over switch 15 and shunt transformer 14 access in parallel transmission line II.
Wherein, described Static Series Synchronous Compensator 2 comprises start-up circuit 6; Described start-up circuit 6 one ends are connected with described converter 9; Described start-up circuit 6 other ends are connected with described change over switch 11.
Wherein, described start-up circuit 6 comprises resistance and switch in parallel.
Wherein, in described series transformer 10 former limit series connection access transmission line II, the secondary of described series transformer 10 is connected with change over switch 11; Described series transformer 10 connects load.
Wherein, described THE UPFC comprises by-pass switch 13; Described by-pass switch 13 is in parallel with described series transformer 12.
Wherein, described converter 7 is made of six brachium pontis of three-phase, and each brachium pontis comprises a reactor and N the submodule that structure is identical; After the submodule cascade of each brachium pontis, an 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 of six brachium pontis of three-phase, and each brachium pontis comprises a reactor and N the submodule that structure is identical; After the submodule cascade of each brachium pontis, an end is connected with described start-up circuit 5, and the reactor with another two brachium pontis after other end series reactor is connected, and forms described converter 7 both positive and negative polarity buses.
Wherein, described converter 9 is made of six brachium pontis of 3 phases, and each brachium pontis comprises 1 reactor and M the submodule that structure is identical; After the submodule cascade of each brachium pontis, an end is connected with described 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 buses, is connected with the both positive and negative polarity bus of described converter 7; Or
Described converter 9 is made of six brachium pontis of 3 phases, and each brachium pontis comprises 1 reactor and M the submodule that structure is identical; After the submodule cascade of each brachium pontis, an end is connected with described transformer 10; Reactor with another two brachium pontis after other end series reactor is connected, and forms described converter 9 both positive and negative polarity buses, is connected with the both positive and negative polarity bus of described converter 7.
Wherein, described submodule consists of 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;
Submodule bypass circuit in parallel between described half-bridge structure mid point and IGBT emitter;
Described dc capacitor can power supply provides power supply for the control circuit of submodule by getting.
Wherein, described change over switch 11 comprises contact 1 ', contact 2 ' and contact 3 ';
In access transmission line I, described convertible static compensator is THE UPFC UPFC if described start-up circuit 6 is connected with series transformer 12 by 1 ' and 3 ' contact of change over switch 11;
In access transmission line II, described convertible static compensator is flow controller IPFC between line if described start-up circuit 6 is connected with series transformer 10 by 2 ' and 3 ' contact of change over switch 11.
Compared with the prior art, the beneficial effect that reaches of the utility model is:
1, the convertible static compensator of the employing modular multilevel converter structure that provides of the utility model, can significantly improve installed capacity, need not to adopt complicated IGBT device serial connection technology;
2, the convertible static compensator of the employing modular multilevel converter structure that provides of the utility model, can realize a minute phase control;
3, the convertible static compensator of the employing modular multilevel converter structure that provides of the utility model, can realize modularized design;
4, the convertible static compensator of the employing modular multilevel converter structure that provides of the utility model, but by redundant technique bypass trouble unit, improve the device operational reliability;
5, the convertible static compensator of the employing modular multilevel converter structure that provides of the utility model is to reduce output harmonic wave, and IGBT device tandem plan switching frequency is usually higher, and the device loss is large; This programme has adopted the modularization multi-level converter technology, and the switching frequency of each device is low, but can realize that external equivalent switching frequency is very high, reduces output harmonic wave, therefore installs running wastage little.
Description of drawings
Fig. 1 is the basic circuit structure figure of the convertible static compensator of the employing modular multilevel converter structure that provides of the utility model;
Fig. 2 is the structure chart of the convertible static compensator main circuit scheme one of the employing modular multilevel converter structure that provides of the utility model;
Fig. 3 is the structure chart of the convertible static compensator main circuit scheme two of the employing modular multilevel converter structure that provides of the utility model;
Fig. 4 is the structure chart of the convertible static compensator submodule of the employing modular multilevel converter structure that provides of the utility model.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
As shown in Figure 1, Fig. 1 is the basic circuit structure figure of the convertible static compensator of the employing modular multilevel converter structure that provides of the utility model, and convertible static compensator comprises STATCOM 1, Static Series Synchronous Compensator 2 and series transformer 12; STATCOM 1 comprises converter 7 and start-up circuit 5; Static Series Synchronous Compensator 2 comprises converter 9, series transformer 10 and change over switch 11; Converter 7 one ends are by in start-up circuit 5 access transmission line in parallel I; The other end of converter 7 is connected with an end of converter 9; The other end of converter 9 is successively by in change over switch 11 and series transformer 10 series connection access transmission line II; In series transformer 12 series connection access transmission line I.
The present embodiment provides a kind of convertible static compensator that adopts modular multilevel converter structure comprises STATCOM 1, Static Series Synchronous Compensator 2 and series transformer 12 as shown in Figure 2; STATCOM 1 comprises converter 7 and start-up circuit 5; Static Series Synchronous Compensator 2 comprises converter 9, series transformer 10 and change over switch 11;
In the former limit of series transformer 10 series connection access transmission line II, the secondary of series transformer 10 is connected with change over switch 11; Series transformer 10 connects load.
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 the positive and negative busbar of converter 7 and converter 9.Two current converters are connected by the intermediate dc link that is made of Support Capacitor 3, and active power can be carried out bi-directional between two current converters like this; Reactive power can be exchanged with system at its AC independently by each current converter.
Preferably, the STATCOM 1 of the present embodiment comprises all right shunt transformer 8, shunt transformer 14 and change over switch 15; One end of converter 7 is successively by in start-up circuit 5, change over switch 15 and shunt transformer 8 access transmission line 1 in parallel; In shunt transformer 14 access transmission line in parallel II.
Wherein, in the former limit of shunt transformer 8 access in parallel transmission line I, shunt transformer 8 secondary are connected with change over switch 15 1 ends.
Wherein, change over switch 15 other ends are connected with start-up circuit 5; Change over switch 15 comprises contact 1 ', contact 2 ' and contact 3 '; In start-up circuit 51 ' and 3 ' contact by change over switch 15 and shunt transformer 8 access in parallel transmission line I; In start-up circuit 52 ' and 3 ' contact by change over switch 15 and shunt transformer 14 access in parallel transmission line II.Shunt transformer 8 and shunt transformer 14 are used for realizing the coupling 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 comprised of resistance and the switch of parallel connection.Start-up circuit 6 one ends are connected with converter 9, and the other end is connected with series transformer 10 1 ends, transformer 10 other end series connection access electrical networks.Start-up circuit 6 can be realized converter 9 smooth startings.Transformer 10 is used for realizing the coupling of line voltage and Static Series Synchronous Compensator output voltage.
Preferably, the THE UPFC of the present embodiment also is provided with by-pass switch 4 and by-pass switch 13 for the safety setting, and by-pass switch 4 is in parallel with series transformer 10, by-pass switch 13 is in parallel with series transformer 12, is used for realizing withdrawing from of Static Series Synchronous Compensator.
The submodule of the present embodiment is used for the output required voltage, adopt the convertible static compensator submodule of modular multilevel converter structure to get structure as shown in Figure 4, it is made of half-bridge structure and dc capacitor, described half-bridge structure comprises the IGBT module of two series connection in up and down, 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 and lower pipe IGBT emitter, get can power supply from the direct current capacitor power taking, for the control circuit of submodule provides the control power supply.The dc capacitor of submodule is used for providing the submodule voltage support.During the submodule internal fault, its bypass circuit is used for making submodule out of service, realizes the redundancy running of STATCOM.Get and to be used for providing the control power supply to the submodule control circuit by power supply.Control circuit is used for realization to control, monitoring and the protection of submodule.The bypass circuit of the present embodiment can be realized by switch, and control circuit can be realized by numeral or analog circuit.Can power supply referenced patent 201010624225.6 or ZL201020700480.X realization but get.
Change over switch 11 comprises contact 1 ', contact 2 ' and contact 3 '; In access transmission line I, convertible static compensator can be regarded as THE UPFC UPFC if start-up circuit 6 is connected with series transformer 12 by 1 ' and 3 ' contact of change over switch 11; In access transmission line II, described convertible static compensator can be regarded as flow controller IPFC between line if start-up circuit 6 is connected with series transformer 10 by 2 ' and 3 ' contact of change over switch 11.
Another convertible static compensator that adopts modular multilevel converter structure that the present embodiment provides as shown in Figure 3, the present embodiment is substantially the same manner as Example 1, but distinctive points is:
The position of the reactor in converter 7 and converter 9 is different.The reactor of the present embodiment is connected on converter 7 and converter 9 positive and negative busbar sides, as shown in Figure 3.It is used for suppressing the current converter output harmonic wave.
Concrete, converter 7 is made of six brachium pontis of three-phase, and each brachium pontis comprises a reactor and N the submodule that structure is identical; After the submodule cascade of each brachium pontis, an end is connected with described start-up circuit 5, and the reactor with another two brachium pontis after other end series reactor is connected, and forms converter 7 both positive and negative polarity buses.
The convertible static compensator of the employing modular multilevel converter structure that the utility model provides, wherein series transformer can have 2, by the change over switch 15 different circuits of access; Perhaps shunt transformer has 2, by the change over switch 11 different circuits of access; Also can both have, access respectively in different circuits.
Should be noted that at last: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit, although with reference to above-described embodiment, the utility model is had been described in detail, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement embodiment of the present utility model, and do not break away from any modification of the utility model spirit and scope or be equal to replacement, it all should be encompassed in the middle of claim scope of the present utility model.
Claims (14)
1. a convertible static compensator that adopts modular multilevel converter structure, is characterized in that, described convertible static compensator comprises STATCOM (1), Static Series Synchronous Compensator (2) and series transformer (12);
Described STATCOM (1) comprises converter (7) and start-up circuit (5);
Described Static Series Synchronous Compensator (2) comprises converter (9), series transformer (10) and change over switch (11);
Described converter (7) one ends are by in start-up circuit (5) access in parallel transmission line I; The other end of described converter (7) is connected with an end of converter (9);
The other end of described converter (9) is successively by in change over switch (11) and series transformer (10) series connection access transmission line II;
In described series transformer (12) series connection access transmission line I.
2. convertible static compensator as claimed in claim 1, is characterized in that, between described STATCOM (1) and described Static Series Synchronous Compensator (2), Support Capacitor (3) is set; Described Support Capacitor (3) is in parallel with described STATCOM (1) and described Static Series Synchronous Compensator (2) respectively.
3. convertible static compensator as claimed in claim 1, is characterized in that, described STATCOM (1) comprises shunt transformer (8), shunt transformer (14) and change over switch (15); One end of described converter (7) is successively by in start-up circuit (5), change over switch (15) and shunt transformer (8) access in parallel transmission line I;
In described shunt transformer (14) access in parallel transmission line II.
4. convertible static compensator as claimed in claim 3, is characterized in that, described start-up circuit (5) comprises resistance and switch in parallel.
5. convertible static compensator as claimed in claim 3, is characterized in that, in the former limit of described shunt transformer (8) access in parallel transmission line I, described shunt transformer (8) secondary is connected with change over switch (15) one ends.
6. convertible static compensator as claimed in claim 1, is characterized in that, described change over switch (15) other end is connected with start-up circuit (5); Described change over switch (15) comprises contact I(1 '), contact II(2 ') and contact III(3 ');
In (1 ') contact I and (3 ') contact III and shunt transformer (8) access in parallel transmission line I of described start-up circuit (5) by change over switch (15);
In (2 ') contact II and (3 ') contact III and shunt transformer (14) access in parallel transmission line II of described start-up circuit (5) by change over switch (15).
7. convertible static compensator as claimed in claim 1, is characterized in that, described Static Series Synchronous Compensator (2) comprises start-up circuit (6); Described start-up circuit (6) one ends are connected with described converter (9); Described start-up circuit (6) other end is connected with described change over switch (11).
8. convertible static compensator as claimed in claim 7, is characterized in that, described start-up circuit (6) comprises resistance and switch in parallel.
9. convertible static compensator as claimed in claim 1, is characterized in that, in described series transformer (10) former limit series connection access transmission line II, the secondary of described series transformer (10) is connected with change over switch (11); Described series transformer (10) connects load.
10. convertible static compensator as claimed in claim 1, is characterized in that, described THE UPFC comprises by-pass switch (13); Described by-pass switch (13) is in parallel with described series transformer (12).
11. convertible static compensator as claimed in claim 1 is characterized in that, described converter (7) is made of six brachium pontis of three-phase, and each brachium pontis comprises a reactor and N the submodule that structure is identical; After the submodule cascade of each brachium pontis, an 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 of six brachium pontis of three-phase, and each brachium pontis comprises a reactor and N the submodule that structure is identical; After the submodule cascade of each brachium pontis, an end is connected with described start-up circuit (5), and the reactor with another two brachium pontis after other end series reactor is connected, and forms described converter (7) both positive and negative polarity bus.
12. convertible static compensator as claimed in claim 1 is characterized in that, described converter (9) is made of six brachium pontis of 3 phases, and each brachium pontis comprises 1 reactor and M the submodule that structure is identical; After the submodule cascade of each brachium pontis, an end is connected with described 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 of six brachium pontis of 3 phases, and each brachium pontis comprises 1 reactor and M the submodule that structure is identical; After the submodule cascade of each brachium pontis, an end is connected with described transformer (10); Reactor with another two brachium pontis after other end series reactor is connected, and forms described converter (9) both positive and negative polarity bus, is connected with the both positive and negative polarity bus of described converter (7).
13. convertible static compensator as described in any one in claim 11-12, it is characterized in that, described submodule consists of 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;
Submodule bypass circuit in parallel between described half-bridge structure mid point and IGBT emitter;
Described dc capacitor can power supply provides power supply for the control circuit of submodule by getting.
14. convertible static compensator as claimed in claim 1 is characterized in that, described change over switch (11) comprises contact I(1 '), contact II(2 ') and contact III(3 ');
If (1 ') contact I and (3 ') contact III of described start-up circuit (6) by change over switch (11) connects with series transformer (12) and access in transmission line I, described convertible static compensator is THE UPFC UPFC;
If (2 ') contact II and (3 ') contact III of described start-up circuit (6) by change over switch (11) connects with series transformer (10) and access in transmission line II, described convertible static compensator is flow controller IPFC between line.
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102983577A (en) * | 2012-07-13 | 2013-03-20 | 中电普瑞科技有限公司 | Convertible static compensator provided with modular multilevel converter structure |
CN107800377A (en) * | 2016-08-31 | 2018-03-13 | 无锡昊阳新能源科技有限公司 | Photovoltaic generation magnetic saturation transformation inverter |
WO2018098672A1 (en) * | 2016-11-30 | 2018-06-07 | 国网江苏省电力公司电力科学研究院 | New unified power flow controller and control method therefor |
-
2012
- 2012-07-13 CN CN2012203749704U patent/CN202949227U/en not_active Expired - Fee Related
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102983577A (en) * | 2012-07-13 | 2013-03-20 | 中电普瑞科技有限公司 | Convertible static compensator provided with modular multilevel converter structure |
CN102983577B (en) * | 2012-07-13 | 2015-09-23 | 中电普瑞科技有限公司 | A kind of convertible static compensator adopting modular multilevel converter structure |
CN107800377A (en) * | 2016-08-31 | 2018-03-13 | 无锡昊阳新能源科技有限公司 | Photovoltaic generation magnetic saturation transformation inverter |
WO2018098672A1 (en) * | 2016-11-30 | 2018-06-07 | 国网江苏省电力公司电力科学研究院 | New unified power flow controller and control method therefor |
US10153640B2 (en) | 2016-11-30 | 2018-12-11 | State Grid Jiangsu Electric Power Research Institute | Unified power flow controller and control method thereof |
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