CN102969708A - Interline power flow controller based on modular multi-level converter structure - Google Patents
Interline power flow controller based on modular multi-level converter structure Download PDFInfo
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- CN102969708A CN102969708A CN2012102671694A CN201210267169A CN102969708A CN 102969708 A CN102969708 A CN 102969708A CN 2012102671694 A CN2012102671694 A CN 2012102671694A CN 201210267169 A CN201210267169 A CN 201210267169A CN 102969708 A CN102969708 A CN 102969708A
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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]
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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
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention relates to an interline power flow controller based on a modular multi-level converter structure. The interline power flow controller comprises a static synchronous compensator (1) and a static synchronous series compensator (2), the static synchronous compensator (1) comprises a converter (7) and a parallel transformer (8), the static synchronous series compensator (2) comprises a converter (9) and a series transformer (10), the converter (7) is connected into a power transmission line I in parallel through the parallel transformer (8), the converter (9) is connected in a power transmission line II in series through the series transformer (10), a unified power flow controller comprises a by-pass switch (4), and the by-pass switch (4) is connected with the series transformer (10) in parallel. The interline power flow controller avoids the technical difficulty of device series connection, facilitates split-phase control and modular design, can bypass a trouble unit through the redundancy technology, improves operational reliability of a device, and is low in device switching frequency and small in device operation loss.
Description
Technical field
The present invention relates to flow controller between the line in a kind of Survey of Flexible AC Transmission System field, be specifically related to a kind of based on flow controller between the line of modular multilevel converter structure.
Background technology
Flow controller between line (IPFC) is that later development and the modern control technology of power application electronic technology realizes 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 trend control.It can finish independently comprehensive compensation of single circuit, the transmission of can also gaining merit between a plurality of circuits.
The IPFC device can be regarded as a STATCOM (STATCOM) device and consists of at DC side parallel with a Static Series Synchronous Compensator (SSSC) device, it can be simultaneously and fast, active power and reactive power in the different circuits of independent control, thereby so that IPFC has the four quadrant running function that STATCOM, SSSC device do not possess.
IPFC device main circuit topology adopts the mode of two voltage source converters (VSC) DC side parallel, wherein an AC side of converter is direct or in parallel with circuit in the system by transformer, and another AC side of converter is connected with another circuit in the system by transformer.Each voltage source converter adopts two level or three level three-phase voltage source converter structures usually.
Among the large capacity IPFC, 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 IPFC.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind ofly based on flow controller between the line of modular multilevel converter structure, flow controller has been evaded the technological difficulties of device series connection between this line, has following features: be 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 objective of the invention is to adopt following technical proposals to realize:
A kind of based on flow controller between the line of modular multilevel converter structure, its improvements are that flow controller comprises STATCOM 1 and Static Series Synchronous Compensator 2 between described line;
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 among the shunt transformer 8 access transmission line I in parallel; Described converter 9 is by among the series transformer 10 series connection access transmission line II;
Described THE UPFC comprises by-pass switch 4; Described by-pass switch 4 is in parallel with described series transformer 10.
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 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 and switch in parallel.
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 series transformer 10.
Wherein, described start-up circuit 6 comprises resistance and switch in parallel.
Wherein, described series transformer 10 connects among the load series connection access transmission line II.
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; An end is connected with described start-up circuit 5 by reactor after the submodule cascade of each brachium pontis; Submodule one end of the cascade of two brachium pontis of the other end and other is connected, and 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; An end is connected with described start-up circuit 5 after the submodule cascade of each brachium pontis, is connected with other reactor of two brachium pontis behind the other end series reactor, 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; An end is connected with described series transformer 10 by reactor after the submodule cascade of each brachium pontis; Submodule one end of the cascade of two brachium pontis of the other end and other 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; 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; An end is connected with described series transformer 10 after the submodule cascade of each brachium pontis; Be connected with other reactor of two brachium pontis behind the other end series reactor, form described converter 9 both positive and negative polarity buses, be 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 the IGBT emitter;
Described dc capacitor can power supply provides power supply for the control circuit of submodule by getting.
Compared with the prior art, the beneficial effect that reaches of the present invention is:
1, provided by the invention based on flow controller between the line of modular multilevel converter structure, can significantly improve installed capacity, need not to adopt complicated IGBT device serial connection technology;
2, provided by the invention based on flow controller between the line of modular multilevel converter structure, can realize a minute phase control;
3, provided by the invention based on flow controller between the line of modular multilevel converter structure, can realize modularized design;
4, provided by the invention based on flow controller between the line of modular multilevel converter structure, but by redundant technique bypass trouble unit, improve the device operational reliability, avoided device to withdraw from frequently and drop into;
5, provided by the invention based on flow controller between the line of modular multilevel converter structure, for reducing output harmonic wave, IGBT device tandem plan switching frequency is usually higher, and the device loss is larger; This programme has adopted the modular multilevel technology, and the switching frequency of each device is lower, but can realize that external equivalent switching frequency is very high, reduces output harmonic wave, and it is less therefore to install running wastage.
Description of drawings
Fig. 1 is provided by the invention based on flow controller basic circuit structure figure between the line of modular multilevel converter structure;
Fig. 2 is the structure chart based on flow controller main circuit scheme one between the line of modular multilevel converter structure provided by the invention;
Fig. 3 is the structure chart based on flow controller main circuit scheme two between the line of modular multilevel converter structure provided by the invention;
Fig. 4 is the structure chart based on flow controller submodule between the line of 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.
Provided by the invention based on flow controller basic circuit structure figure between the line of modular multilevel converter structure as shown in Figure 1, comprise 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 among the shunt transformer 8 access transmission line I in parallel; Described converter 9 is by among the series transformer 10 series connection access transmission line II.
Present embodiment provides a kind of convertible static compensator based on modular multilevel converter structure comprises STATCOM 1 and Static Series Synchronous Compensator 2 as shown in Figure 2; STATCOM 1 comprises converter 7 and shunt transformer 8; Static Series Synchronous Compensator 2 comprises converter 9 and series transformer 10;
Preferably, 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 link to each other 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 secondary of the shunt transformer 8 of the STATCOM 1 of present embodiment is connected with start-up circuit 5, among the former limit access in parallel transmission line I of shunt transformer 8.Shunt transformer 8 is used for realizing the coupling of line voltage and STATCOM output voltage.
Preferably, the Static Series Synchronous Compensator 2 of 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, among series transformer 10 other ends series connection access transmission line II.Start-up circuit 6 can be realized converter 9 smooth startings.Series transformer 10 is used for realizing the coupling of line voltage and Static Series Synchronous Compensator output voltage.
Preferably, the THE UPFC of present embodiment also is provided with by-pass switch 4 for the safety setting, and by-pass switch 4 is in parallel with series transformer 10, is used for realizing withdrawing from of Static Series Synchronous Compensator.
The submodule of present embodiment is used for the output required voltage, structure based on flow controller submodule between the line of modular multilevel converter structure provided by the invention as shown in Figure 4, it is made of half-bridge structure and dc capacitor, described half-bridge structure comprises the up and down IGBT module of two series connection, parallel connection direct electric capacity between upper pipe IGBT collector electrode and the lower pipe IGBT emitter, submodule bypass circuit in parallel between half-bridge structure mid point and the 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 present embodiment can be realized that by switch control circuit can be realized by numeral or analog circuit.Can power supply referenced patent 201010624225.6 or ZL201020700480.X realization but get.
Embodiment 2
Present embodiment is substantially the same manner as Example 1, but distinctive points is:
The position of the reactor in converter 7 and the converter 9 is different.The reactor of 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 three-phase six brachium pontis, and each brachium pontis comprises a reactor and N the submodule that structure is identical; An end is connected with described start-up circuit 5 after the submodule cascade of each brachium pontis, is connected with other reactor of two brachium pontis behind the other end series reactor, forms converter 7 both positive and negative polarity buses.
Should be noted that at last: 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 the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1. one kind based on flow controller between the line of modular multilevel converter structure, it is characterized in that flow controller comprises STATCOM (1) and Static Series Synchronous Compensator (2) between described line;
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 among shunt transformer (8) the access in parallel transmission line I; Described converter (9) is by among series transformer (10) the series connection access transmission line II;
Described THE UPFC comprises by-pass switch (4); Described by-pass switch (4) is in parallel with described series transformer (10).
2. flow controller between line 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. flow controller between line as claimed in claim 1 is characterized in that, 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.
4. flow controller between line as claimed in claim 3 is characterized in that, described start-up circuit (5) comprises resistance and switch in parallel.
5. flow controller between line 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 series transformer (10).
6. flow controller between line as claimed in claim 5 is characterized in that, described start-up circuit (6) comprises resistance and switch in parallel.
7. flow controller between line as claimed in claim 1 is characterized in that, described series transformer (10) connects among the load series connection access transmission line II.
8. flow controller between line 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; An end is connected with described start-up circuit (5) by reactor after the submodule cascade of each brachium pontis; Submodule one end of the cascade of two brachium pontis of the other end and other is connected, and 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; An end is connected with described start-up circuit (5) after the submodule cascade of each brachium pontis, is connected with other reactor of two brachium pontis behind the other end series reactor, forms described converter (7) both positive and negative polarity bus.
9. flow controller between line 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; An end is connected with described series transformer (10) by reactor after the submodule cascade of each brachium pontis; Submodule one end of the cascade of two brachium pontis of the other end and other 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); 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; An end is connected with described series transformer (10) after the submodule cascade of each brachium pontis; Be connected with other reactor of two brachium pontis behind the 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).
10. such as flow controller between each described line among the claim 8-9, 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 the IGBT emitter;
Described dc capacitor can power supply provides power supply for the control circuit of submodule by getting.
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| CN201210267169.4A CN102969708B (en) | 2012-07-13 | 2012-07-13 | Flow controller between a kind of line based on modular multilevel converter structure |
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| CN201210267169.4A CN102969708B (en) | 2012-07-13 | 2012-07-13 | Flow controller between a kind of line based on modular multilevel converter structure |
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Cited By (11)
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| CN103760462A (en) * | 2014-01-14 | 2014-04-30 | 昆明理工大学 | Current transient quantity principal component cluster analysis direction protection method for power transmission line with static synchronous series compensator |
| CN103972887A (en) * | 2014-05-19 | 2014-08-06 | 南京南瑞继保电气有限公司 | Unified power flow controller for double-circuit line |
| CN103986159A (en) * | 2014-05-26 | 2014-08-13 | 国家电网公司 | Mounting circuit of unified power flow controller in transformer substation with multiple circuits |
| WO2016019853A1 (en) * | 2014-08-05 | 2016-02-11 | 南京南瑞继保电气有限公司 | Starting method and stopping method for static synchronous series compensator |
| CN105680453A (en) * | 2016-03-14 | 2016-06-15 | 全球能源互联网研究院 | Improved shunt hybrid unified power flow controller |
| CN105870927A (en) * | 2016-03-14 | 2016-08-17 | 全球能源互联网研究院 | Unified power flow controller with multiple operational modes |
| 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 |
| CN106961106A (en) * | 2017-05-05 | 2017-07-18 | 贵州电网有限责任公司电力科学研究院 | A kind of low-voltage network multiterminal joint electric power-feeding structure based on IPFC |
| CN108321775A (en) * | 2018-01-30 | 2018-07-24 | 国网上海市电力公司 | The mating protection method of UPFC devices and electric system |
| CN109066694A (en) * | 2018-09-29 | 2018-12-21 | 东南大学 | Multiple target tide optimization method containing the electric system of flow controller between line |
| CN109638829A (en) * | 2019-01-11 | 2019-04-16 | 广州供电局有限公司 | 10kV power distribution network turns electric installation without suture ring |
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| CN103760462B (en) * | 2014-01-14 | 2016-08-24 | 昆明理工大学 | A kind of current temporary state amount classified analysis on major constituents direction protection method of band SSSC transmission line of electricity |
| CN103760462A (en) * | 2014-01-14 | 2014-04-30 | 昆明理工大学 | Current transient quantity principal component cluster analysis direction protection method for power transmission line with static synchronous series compensator |
| CN103972887A (en) * | 2014-05-19 | 2014-08-06 | 南京南瑞继保电气有限公司 | Unified power flow controller for double-circuit line |
| CN103986159A (en) * | 2014-05-26 | 2014-08-13 | 国家电网公司 | Mounting circuit of unified power flow controller in transformer substation with multiple circuits |
| CN103986159B (en) * | 2014-05-26 | 2015-10-28 | 国家电网公司 | There is the mounting circuit of THE UPFC in multi transformer station |
| US10461534B2 (en) | 2014-08-05 | 2019-10-29 | Nr Electric Co., Ltd | Starting method and stopping method for a static synchronous series compensator |
| WO2016019853A1 (en) * | 2014-08-05 | 2016-02-11 | 南京南瑞继保电气有限公司 | Starting method and stopping method for static synchronous series compensator |
| CN105680453A (en) * | 2016-03-14 | 2016-06-15 | 全球能源互联网研究院 | Improved shunt hybrid unified power flow controller |
| CN105870927A (en) * | 2016-03-14 | 2016-08-17 | 全球能源互联网研究院 | Unified power flow controller with multiple operational modes |
| CN105680453B (en) * | 2016-03-14 | 2024-02-02 | 全球能源互联网研究院有限公司 | Improved parallel hybrid unified power flow controller |
| 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 |
| WO2018033058A1 (en) * | 2016-08-16 | 2018-02-22 | 南京南瑞继保电气有限公司 | Series compensation device |
| CN106961106A (en) * | 2017-05-05 | 2017-07-18 | 贵州电网有限责任公司电力科学研究院 | A kind of low-voltage network multiterminal joint electric power-feeding structure based on IPFC |
| CN108321775A (en) * | 2018-01-30 | 2018-07-24 | 国网上海市电力公司 | The mating protection method of UPFC devices and electric system |
| CN109066694A (en) * | 2018-09-29 | 2018-12-21 | 东南大学 | Multiple target tide optimization method containing the electric system of flow controller between line |
| CN109066694B (en) * | 2018-09-29 | 2019-12-10 | 东南大学 | multi-objective power flow optimization method for power system containing inter-line power flow controller |
| CN109638829A (en) * | 2019-01-11 | 2019-04-16 | 广州供电局有限公司 | 10kV power distribution network turns electric installation without suture ring |
| CN109638829B (en) * | 2019-01-11 | 2024-04-30 | 广东电网有限责任公司广州供电局 | No-sewing ring power conversion device for 10kV power distribution network |
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