CN104113070A - Static synchronous compensator suitable for multiple lines - Google Patents
Static synchronous compensator suitable for multiple lines Download PDFInfo
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- CN104113070A CN104113070A CN201410353533.8A CN201410353533A CN104113070A CN 104113070 A CN104113070 A CN 104113070A CN 201410353533 A CN201410353533 A CN 201410353533A CN 104113070 A CN104113070 A CN 104113070A
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- statcom
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
Abstract
The invention discloses a static synchronous compensator suitable for multiple lines. N lines comprise at least one parallel transformer, N current converters, a switching loop and at least N serial transformers, and at least one side of each serial transformer is connected with at least one bypass switch in parallel. The alternating current side of each converter is connected with at least one parallel transformer through the switching loop and is further connected with an alternating current system; and meanwhile, the alternating current side of each converter is connected with at least one serial transformer through the switching loop, and the serial transformers are connected with corresponding circuits in series. The static synchronous compensator suitable for multiple lines is capable of realizing various control modes and has good economical efficiency and flexibility.
Description
Technical field
The present invention relates to a kind of flexible AC transmission technology, be specifically related to a kind of STATCOM that is applicable to many circuits.
Background technology
Along with the use of the interconnected and various new equipments of large-scale power system, making generating, transmit electricity scale and complexity more economical, that also increased more efficiently electric power system simultaneously.Because environmental limitations, workload demand increase, the reasons such as investment cost increase that require increasingly stringent, build power transmission line of user to the reliability of power system power supply and economy, the trend that appearance develops into large interval modern power systems of networking by regional power system is day by day bright and clear.The inharmonious formation that causes long distance power transmission and large electrical network between National energy distribution inequality and load center, occur the problems such as system oscillation, system stability control, alternating current-direct current mixing electric network coordination, trend control ability, voltage collapse and voltage stabilization, this all requires to improve ability to transmit electricity and the ability of regulation and control of transmission system.
STATCOM STATCOM (Static Synchronous Compensator) and Static Series Synchronous Compensator SSSC (Static Synchronous Series Compensator) are current more common raising system ability to transmit electricity and the equipment of ability of regulation and control.STATCOM equipment and transmission line are in parallel, and are equivalent to the current source that a tie point place is injected to system, by changing amplitude and the phase place of this current source output current, can change fast the reactive power exchange with system.Can improve the performance of electric power system aspect following: dynamic electric voltage is controlled, damping of power oscillation, transient stability, the advantage such as voltage flicker control etc., compare with traditional reactive power compensator, and its reliability is higher, governing speed is fast.
The principle of Static Series Synchronous Compensator is on connected circuit, to inject a size to have nothing to do and the phase place voltage vertical with line current phase place with line current, change the effective impedance that this voltage swing is just equivalent to change circuit, thus can control system trend.Because it is the compensation equipment based on power electronic device, can as fixed series compensation and controlled series compensation, there is not subsynchronous resonance (SSR).
The application of STATCOM is at present more extensive, and SSSC does not also have independent engineering project, but it is as a kind of operational mode of THE UPFC (UPFC), existing engineering operation example.STATCOM can control system alternating voltage and Quick reactive-load compensation, SSSC can control circuit trend, THE UPFC combines both advantages.For many circuits, need trend control, the voltage-controlled situation of AC system needs, as THE UPFC is installed, realize, for N bar circuit, need 2N converter, cost of investment is higher.In conjunction with the THE UPFC engineering having put into operation, it is few that electric power system need to be carried out the situation that system voltage control and Line Flow control simultaneously, this just needs a kind of more economical, scheme more flexibly, can realize that system alternating voltage is controlled and the control of the trend of many circuits, and cost of investment low, take up an area little.
Summary of the invention
Object of the present invention, is to provide a kind of STATCOM that is applicable to many circuits, can control the trend of many circuits, can also control AC system voltage control, and cost of investment is low, has good economy, flexibility and reliability.
In order to achieve the above object, solution of the present invention is:
A STATCOM that is applicable to many circuits, is characterized in that:
For N bar circuit, described STATCOM comprises at least one shunt transformer, a N converter, back brake loop and N series transformer at least; At least one side at least one group of by-pass switch in parallel of each series transformer; The AC of described converter connects at least one series transformer through back brake loop, described series transformer series connection line attachment; After the AC of described converter is connected with at least one shunt transformer through back brake loop, then incoming transport system; Wherein N is natural number, and N is greater than 1.
Further: described back brake loop consists of at least one change over switch, for converter being connected with top-cross streaming system in parallel or exiting connection, and for converter being connected with series transformer or exiting connection.
Further: described STATCOM also comprises at least one side starting circuit in parallel, correspondingly, described converter, behind back brake loop, connects side starting circuit in parallel described at least one, and starting circuit is connected with at least one shunt transformer again.
Further: described by-pass switch is bypass breaker or Quick side way switch.
Further: described at least one group, bypass breaker is connected in parallel on the two ends of described series transformer line side winding, for controlling the access of described series transformer or exiting circuit.
Further: described at least one group, Quick side way switch is connected in parallel on the winding two ends of described series transformer valve side, during for fault, by the quick bypass of described converter, isolate with transmission line.
Further: described change over switch is isolation switch or circuit breaker or the switch that consists of power electronic equipment.
Further: the AC system of described shunt transformer access is for connecting the bus of transmission line, or other ac bus.
Further: described side starting circuit in parallel comprises resistance and the switch of a pair of parallel connection, described switch is isolation switch or circuit breaker or the switch that consists of power electronic device.
Further: described Quick side way switch is circuit breaker, two-way antiparallel thyristor or other power electronic device.
Further: described converter is voltage-source type converter, include but not limited to two level structures, transformer multiple inverter configuration or modular multilevel structure.
Further: described series transformer is single-phase or three-phase transformer, the line side winding phase-splitting of described series transformer seals in circuit.
Adopt after such scheme, the present invention can improve economy and the flexibility of STATCOM.Due to load seasonal variety, electric network swim summer and winter peak there is more problem, this period, may operate in multi circuit transmission lines Static Series Synchronous Compensator mode, optimize Line Flow; When electric network swim problem is little, may operate in STATCOM mode, improve the idle deposit of system; Or part converter operates in STATCOM mode, part converter operates in static synchronous series compensation mode.This device is more or less the same with control function and UPFC in the control effect aspect trend control and the enhancing stability of a system, the power electronic device of its use only has many circuits that half of UPFC is all installed, cost is more much lower than the UPFC of identical control ability, has good economy.
Accompanying drawing explanation
Fig. 1 is the single-phase equivalent structure figure of the STATCOM that is applicable to many circuits of one embodiment of the invention;
Fig. 2 is the single-phase equivalent structure figure of the STATCOM that is applicable to many circuits of another embodiment of the present invention;
Fig. 3 is that the AC system of the shunt transformer access of one embodiment of the invention is the structure chart that connects the bus of transmission line;
Fig. 4 is the structure chart with change over switch formation back brake loop of one embodiment of the invention;
Fig. 5 is that the present invention forms the structure chart of another embodiment in back brake loop with change over switch.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.
The present invention proposes a kind of STATCOM that is applicable to many circuits, and an one preferred embodiment as shown in Figure 1.In figure, 1 is shunt transformer, and 2 is back brake loop, 3 is voltage source converter, and 4,5 is series transformer, and 6 is the Quick side way switch of series transformer valve side winding parallel, 7,8 is the bypass breaker of series transformer line side winding parallel, 9 reactance such as value that are transmission line.
For N bar circuit, described in be applicable to many circuits STATCOM comprise at least one shunt transformer 1, a N converter 3, back brake loop 2 and N series transformer 4,5 at least; At least one side at least one bypass breaker 7,8 in parallel of each series transformer 4,5 or at least one group of Quick side way switch 6 or both all parallel connections; The AC of the converter 3 of described STATCOM connects at least one series transformer 4,5 through back brake loop 2, then the line attachment of connecting; Meanwhile, after the AC of described converter 3 is connected with at least one shunt transformer 1 through back brake loop 2, then incoming transport system.It should be noted that, at least one side at least one group of by-pass switch in parallel of described series transformer 4,5, by-pass switch can be bypass breaker or Quick side way switch.Series transformer 4,5 can, at side while bypass breaker in parallel and/or a Quick side way switch, also can be distinguished bypass breaker in parallel and/or Quick side way switch in the both sides of series transformer.
Aforesaid back brake loop 2 can be realized by change over switch, for converter being connected with top-cross streaming system in parallel or exiting connection, and for converter being connected with series transformer or exiting connection.Embodiment as shown in Figure 4, the grid switching operation of the change over switch comprising by back brake loop, N converter can be connected to top-cross streaming system in parallel, also can be connected to transmission line.Embodiment as shown in Figure 5, N converter can be connected to a plurality of different AC system.
The present invention also provides another embodiment as shown in Figure 2 in addition, adopts the structure chart of a plurality of shunt transformers and a plurality of side starting circuits in parallel; 10 is side starting circuit in parallel, and correspondingly, described converter 3, behind back brake loop 2, connects side starting circuit 10 in parallel described at least one, and starting circuit 10 is connected with at least one shunt transformer 1 again.Described side starting circuit 10 in parallel comprises resistance and the switch of a pair of parallel connection, and described switch is isolation switch or circuit breaker or the switch that consists of power electronic device.
The series transformer bypass breaker 7,8 of aforesaid STATCOM, comprises at least one group of two ends that are connected in parallel on described series transformer 4,5 line side windings, for controlling the access of described series transformer 4,5 or exiting circuit.
The series transformer Quick side way switch 6 of aforesaid STATCOM, comprises at least one group of two ends that are connected in parallel on the winding of transformer 4,5 valve sides, during for fault, by the quick bypass of converter 3, isolates with circuit.Described Quick side way switch 6 is circuit breaker, two-way antiparallel thyristor or other power electronic device.
The change over switch in the back brake loop 2 of aforementioned STATCOM is isolation switch or circuit breaker or the switch that consists of power electronic equipment.
The bus that the AC system of shunt transformer 1 access of aforementioned STATCOM is connection transmission line, example embodiment as shown in Figure 3.Or other ac bus, embodiment as shown in Figure 1.
The converter 3 of aforementioned STATCOM can be the voltage-source type converter of two level structures, transformer multiple inverter configuration, modular multilevel structure or other topological structure.
The series transformer 4,5 of aforementioned STATCOM is single-phase or three-phase transformer, and the line side winding phase-splitting of described series transformer 4,5 seals in circuit.
It should be noted that, each element in the present invention, as reactor, resistance, switch etc., refers to equivalence element mostly; That is to say, the equivalence element in circuit structure can be both single element, can be also that a plurality of same element cascades (series, parallel etc.) form.For any equivalence element in the embodiment of the present invention, within any equivalent electric circuit that can realize said function should all be encompassed in the protection range of the embodiment of the present invention.
Finally should be noted that: in conjunction with above-described embodiment, only illustrate that technical scheme of the present invention is not intended to limit.Those of ordinary skill in the field are to be understood that: those skilled in the art can modify or be equal to replacement the specific embodiment of the present invention, but within the claimed scope of patent that these modifications or change are all awaited the reply in application.
Claims (12)
1. a STATCOM that is applicable to many circuits, is characterized in that:
For N bar circuit, described STATCOM comprises at least one shunt transformer, a N converter, back brake loop and N series transformer at least; At least one side at least one group of by-pass switch in parallel of each series transformer; The AC of described converter connects at least one series transformer through back brake loop, described series transformer series connection line attachment; After the AC of described converter is connected with at least one shunt transformer through back brake loop, then incoming transport system; Wherein N is natural number, and N is greater than 1.
2. a kind of STATCOM that is applicable to many circuits as claimed in claim 1, it is characterized in that: described back brake loop consists of at least one change over switch, for converter being connected with top-cross streaming system in parallel or exiting connection, and for converter being connected with series transformer or exiting connection.
3. a kind of STATCOM that is applicable to many circuits as claimed in claim 1, it is characterized in that: described STATCOM also comprises at least one side starting circuit in parallel, correspondingly, described converter is behind back brake loop, connect side starting circuit in parallel described at least one, starting circuit is connected with at least one shunt transformer again.
4. a kind of STATCOM that is applicable to many circuits as claimed in claim 1, is characterized in that: described by-pass switch is bypass breaker or Quick side way switch.
5. a kind of STATCOM that is applicable to many circuits as claimed in claim 4, it is characterized in that: described at least one group, bypass breaker is connected in parallel on the two ends of described series transformer line side winding, for controlling the access of described series transformer or exiting circuit.
6. a kind of STATCOM that is applicable to many circuits as claimed in claim 4, it is characterized in that: described at least one group, Quick side way switch is connected in parallel on the winding two ends of described series transformer valve side, during for fault, by the quick bypass of described converter, isolate with transmission line.
7. a kind of STATCOM that is applicable to many circuits as claimed in claim 2, is characterized in that: described change over switch is isolation switch or circuit breaker or the switch that consists of power electronic equipment.
8. a kind of STATCOM that is applicable to many circuits as claimed in claim 1, is characterized in that: the AC system of described shunt transformer access is for connecting the bus of transmission line, or other ac bus.
9. a kind of STATCOM that is applicable to many circuits as claimed in claim 3, it is characterized in that: described side starting circuit in parallel comprises resistance and the switch of a pair of parallel connection, described switch is isolation switch or circuit breaker or the switch that consists of power electronic device.
10. a kind of STATCOM that is applicable to many circuits as claimed in claim 4, is characterized in that: described Quick side way switch is circuit breaker, two-way antiparallel thyristor or other power electronic device.
11. a kind of STATCOM that are applicable to many circuits as claimed in claim 1, is characterized in that: described converter is voltage-source type converter, include but not limited to two level structures, transformer multiple inverter configuration or modular multilevel structure.
12. a kind of STATCOM that are applicable to many circuits as claimed in claim 1, is characterized in that: described series transformer is single-phase or three-phase transformer, the line side winding phase-splitting of described series transformer seals in circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410353533.8A CN104113070A (en) | 2014-07-23 | 2014-07-23 | Static synchronous compensator suitable for multiple lines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410353533.8A CN104113070A (en) | 2014-07-23 | 2014-07-23 | Static synchronous compensator suitable for multiple lines |
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| Publication Number | Publication Date |
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| CN104113070A true CN104113070A (en) | 2014-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410353533.8A Pending CN104113070A (en) | 2014-07-23 | 2014-07-23 | Static synchronous compensator suitable for multiple lines |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015176546A1 (en) * | 2014-05-19 | 2015-11-26 | 南京南瑞继保电气有限公司 | Unified power flow controller for double-circuit line |
| CN106159976A (en) * | 2016-08-16 | 2016-11-23 | 南京南瑞继保电气有限公司 | A kind of series compensation device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002247760A (en) * | 2001-02-15 | 2002-08-30 | Toshiba Corp | Starting method of serial compensator |
| 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 |
-
2014
- 2014-07-23 CN CN201410353533.8A patent/CN104113070A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002247760A (en) * | 2001-02-15 | 2002-08-30 | Toshiba Corp | Starting method of serial compensator |
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| 苏玲等: "《可转换式静止补偿器——一种新型FACTS控制块》", 《国际电力》, vol. 7, no. 1, 28 February 2003 (2003-02-28), pages 21 - 23 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015176546A1 (en) * | 2014-05-19 | 2015-11-26 | 南京南瑞继保电气有限公司 | Unified power flow controller for double-circuit line |
| US10033186B2 (en) | 2014-05-19 | 2018-07-24 | Nr Electric Co., Ltd. | Unified power flow controller for double-circuit line |
| CN106159976A (en) * | 2016-08-16 | 2016-11-23 | 南京南瑞继保电气有限公司 | A kind of series compensation device |
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Application publication date: 20141022 |