CN201766494U - Bypass circuit of chain link in high-voltage chained static synchronization compensator - Google Patents
Bypass circuit of chain link in high-voltage chained static synchronization compensator Download PDFInfo
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- CN201766494U CN201766494U CN2010202939702U CN201020293970U CN201766494U CN 201766494 U CN201766494 U CN 201766494U CN 2010202939702 U CN2010202939702 U CN 2010202939702U CN 201020293970 U CN201020293970 U CN 201020293970U CN 201766494 U CN201766494 U CN 201766494U
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- chain link
- bridge
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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 utility model discloses a bypass circuit of a chain link in a high-voltage chained static synchronization compensator, comprising a single-phase diode rectification bridge and a silicon controlled rectifier SCR which are connected to the alternating-current output end of an H-bridge power module in parallel; the bypass circuit further comprises a current-limiting inductor, an overvoltage absorbing circuit and a charging circuit; two alternating-current output ends of the H-bridge power module are respectively connected with the current-limiting inductor in series and then are connected with two alternating-current output ends of the single-phase diode rectification bridge, and the overvoltage absorbing circuit is connected with the two alternating-current input ends of the single-phase diode rectification bridge; the charging circuit comprises a charging capacitor CS1, a charging resistor RS1, a discharging resistor RS2 and a charging branching circuit; wherein, the charging capacitor CS1 is connected with the charging resistor RS1 in series after being connected with the discharging resistor RS2 in parallel, and then the charging capacitor CS1 is connected to two ends of the silicon controlled rectifier SCR in parallel, and the charging branching circuit is connected between the direct current bus of the H-bridge power module and the direct current bus of the single-phase diode rectification bridge in parallel. In the utility model, two ends of the controlled silicon can be charged to preset values, so as to avoid misconduction faults of a controlled silicon or semiconductor switch when the chain link works.
Description
Technical field
The utility model relates to the bypass circuit of chain link in a kind of high-voltage chain type static and synchronous compensator, belongs to the electric automatization equipment technical field.
Background technology
Chain static synchronous compensator generally abbreviates chain type STATCOM or chain type SVG as, is a kind of active dynamic reactive compensation device based on the chain type voltage source converter, and it has a series of advantage, has become the developing direction of STATCOM.
Chain type SVG when a chain link (i.e. Chuan Lian H bridge power model) fault takes place, in order to improve whole device reliability of operation, needs the chain link of bypass fault in running, make whole current transformer can continue operation.As shown in Figure 1, Fig. 1 has provided the common circuit that realizes the power model bypass, it is by a H bridge power model, and the single-phase diode rectifier bridge (D1-D4 composition) and controllable silicon (or other semiconductor switchs) the SCR composition that are connected in parallel on two ac output ends of H bridge power model (O1, O2 are the ac output end of H bridge power model).Wherein H bridge power model comprises that dc capacitor C1, power semiconductor switch S1, S2, S3, S4 and inverse parallel diode E1, E2, E3, E4 constitute.The collector electrode of power semiconductor switch S1, S2, S3, S4 is connected with the negative electrode of diode E1, E2, E3, E4 respectively, the emitter of power semiconductor switch S1, S2, S3, S4 is connected with the anode of diode E1, E2, E3, E4 respectively, and the base stage of power semiconductor switch S1, S2, S3, S4 is unsettled; Power semiconductor switch S1 and power semiconductor switch S2 series connection, power semiconductor switch S3 and power semiconductor switch S4 series connection, and the collector electrode of power semiconductor switch S1 is in parallel with the collector electrode of power semiconductor switch S3, and the collector electrode of power semiconductor switch S2 is in parallel with the collector electrode of power semiconductor switch S4; Back in parallel is in parallel with dc capacitor C1.Single-phase diode rectifier bridge D1, D2, D3, D4 are in parallel with controllable silicon (or other semiconductor switchs) SCR.When certain chain link fault, the power device driving pulse of power model is blocked, and the controllable silicon SCR conducting that is triggered is afterwards flow through load current from diode rectifier bridge and controllable silicon SCR, do not influence the output of whole rating of set.
There is following problem in bypass circuit shown in Figure 1 in application: because the dv/dt (rate of voltage rise) that can bear between controllable silicon (or other semiconductor switchs) SCR sun negative electrode is limited, when switching device begins conducting in the chain link, because controllable silicon (or other semiconductor switchs) SCR both end voltage is zero, the chain link dc voltage directly is added between controllable silicon SCR sun negative electrode, controllable silicon SCR can be born the dv/dt above its tolerance, cause it to mislead, cause chain link and exchange the output short-circuit fault.
The utility model content
The purpose of this utility model is to provide the bypass circuit of chain link in a kind of high-voltage chain type static and synchronous compensator, overcome the deficiencies in the prior art part, making can be by bypass effectively when the chain link fault, and powering on the back chain link when beginning output AC voltage, bypass circuit can malfunction cause the power model fault that is short-circuited.
In order to achieve the above object, the technical solution of the utility model is:
The bypass circuit of chain link in a kind of high-voltage chain type static and synchronous compensator comprises the single-phase diode rectifier bridge and the controllable silicon SCR that are connected in parallel on H bridge power model ac output end, and this bypass circuit also comprises current-limiting inductance, overpressure absorbing circuit and charging circuit; Two ac input ends that two ac output ends of described H bridge power model are connected respectively after the current-limiting inductance with the single-phase diode rectifier bridge link; The anode of described controllable silicon SCR links to each other with the direct current positive output end of diode rectifier bridge, and the negative electrode of controllable silicon SCR links to each other with the direct current negative output terminal of diode rectifier bridge; Overpressure absorbing circuit is connected to two ac input ends of single-phase diode rectifier bridge; Described charging circuit comprises charging capacitor CS1, charging resistor RS1, discharge resistance RS2 and charging paths, wherein connect with charging resistor RS1 after charging capacitor CS1 and the discharge resistance RS2 parallel connection, be connected to the two ends of controllable silicon SCR again, described charging paths is connected between the dc bus of H bridge power model dc bus and single-phase diode rectifier bridge.
Described current-limiting inductance comprises current-limiting inductance L1 and current-limiting inductance L2.
Described overpressure absorbing circuit is in series by absorption resistance RS and absorption capacitor C S.
Described charging paths comprises 2 charging paths that are composed in series and are composed in series by charging diode D6 and current-limiting resistance R2 by charging diode D5 and current-limiting resistance R1.
The beneficial effects of the utility model are: the bypass circuit of chain link in the high-voltage chain type static and synchronous compensator that the utility model proposes, can be before chain link powers on the beginning output AC voltage, be charged to certain voltage in advance between described controllable silicon sun negative electrode, make when chain link begins output AC voltage controllable silicon can be because not bearing too high dv/dt the fault that misleads, and can be bypassed effectively during the chain link fault.
Description of drawings
Fig. 1 is a bypass circuit schematic diagram commonly used at present.
Fig. 2 is the bypass circuit figure of chain link in the high-voltage chain type static and synchronous compensator of the present utility model.
Embodiment
As shown in Figure 2, dc capacitor C1 and power semiconductor switch S1, S2, S3, S4 and inverse parallel diode E1 thereof, E2, E3, E4 constitute chain link (H bridge power model) key element, and O1, O2 are the ac output end of H bridge power model.
The bypass circuit of chain link in a kind of high-voltage chain type static and synchronous compensator of present embodiment indication, comprise the single-phase diode rectifier bridge and the controllable silicon SCR that are connected in parallel on H bridge power model ac output end, this bypass circuit also comprises current-limiting inductance, overpressure absorbing circuit and charging circuit; Two ac input ends that two ac output ends of described H bridge power model are connected respectively after the current-limiting inductance with the single-phase diode rectifier bridge link; Wherein current-limiting inductance comprises current-limiting inductance L1 and current-limiting inductance L2.The anode of described controllable silicon SCR links to each other with the direct current positive output end of diode rectifier bridge, and the negative electrode of controllable silicon SCR links to each other with the direct current negative output terminal of diode rectifier bridge; Overpressure absorbing circuit is connected to two ac input ends of single-phase diode rectifier bridge; Overpressure absorbing circuit is in series by absorption resistance RS and absorption capacitor C S.Described charging circuit comprises charging capacitor CS1, charging resistor RS1, discharge resistance RS2 and charging paths, wherein connect with charging resistor RS1 after charging capacitor CS1 and the discharge resistance RS2 parallel connection, be connected to the two ends of controllable silicon SCR again, described charging paths is connected between the dc bus of H bridge power model dc bus and single-phase diode rectifier bridge.Wherein charging paths comprises 2 charging paths that are composed in series and are composed in series by charging diode D6 and current-limiting resistance R2 by charging diode D5 and current-limiting resistance R1.
When chain link dc capacitor C1 is recharged, charging capacitor CS1 two ends are charged to certain voltage by charging diode D5, current-limiting resistance R1, charging diode D6, current-limiting resistance R2 and charging resistor RS1, make power semiconductor switch S1, S2, S3, reverse-blocking tetrode thyristor SCR can not mislead because bearing too high dv/dt when S4 opened.Discharge resistance RS2 prevents that charging capacitor CS1 is charged to too high magnitude of voltage.Current-limiting inductance L1 and L2 are used at power semiconductor switch S1, S2, S3, limit the charging current of charging capacitor CS1 when S4 opens, thereby also play the effect of the restriction controllable silicon SCR sun negative electrode both end voltage rate of climb.Absorption resistance RS and absorption capacitor C S play the effect of the peak voltage of the ac input end that absorbs single-phase diode rectifier bridge D1-D4.
The above only is a specific embodiment of the utility model, does not limit protection range of the present utility model with this.Any equivalent transformation circuit of doing based on the utility model all belongs to the utility model protection range.
Claims (4)
1. the bypass circuit of chain link in the high-voltage chain type static and synchronous compensator, comprise the single-phase diode rectifier bridge and the controllable silicon SCR that are connected in parallel on H bridge power model ac output end, it is characterized in that: this bypass circuit also comprises current-limiting inductance, overpressure absorbing circuit and charging circuit; Two ac input ends that two ac output ends of described H bridge power model are connected respectively after the current-limiting inductance with the single-phase diode rectifier bridge link; The anode of described controllable silicon SCR links to each other with the direct current positive output end of diode rectifier bridge, and the negative electrode of controllable silicon SCR links to each other with the direct current negative output terminal of diode rectifier bridge; Overpressure absorbing circuit is connected to two ac input ends of single-phase diode rectifier bridge; Described charging circuit comprises charging capacitor CS1, charging resistor RS1, discharge resistance RS2 and charging paths, wherein connect with charging resistor RS1 after charging capacitor CS1 and the discharge resistance RS2 parallel connection, be connected to the two ends of controllable silicon SCR again, described charging paths is connected between the dc bus of H bridge power model dc bus and single-phase diode rectifier bridge.
2. the bypass circuit of chain link in a kind of high-voltage chain type static and synchronous compensator as claimed in claim 1 is characterized in that: described current-limiting inductance comprises current-limiting inductance L1 and current-limiting inductance L2.
3. the bypass circuit of chain link in a kind of high-voltage chain type static and synchronous compensator as claimed in claim 1 is characterized in that: described overpressure absorbing circuit is in series by absorption resistance RS and absorption capacitor C S.
4. the bypass circuit of chain link in a kind of high-voltage chain type static and synchronous compensator as claimed in claim 1 is characterized in that: described charging paths comprises 2 charging paths that are composed in series and are composed in series by charging diode D6 and current-limiting resistance R2 by charging diode D5 and current-limiting resistance R1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202939702U CN201766494U (en) | 2010-08-12 | 2010-08-12 | Bypass circuit of chain link in high-voltage chained static synchronization compensator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202939702U CN201766494U (en) | 2010-08-12 | 2010-08-12 | Bypass circuit of chain link in high-voltage chained static synchronization compensator |
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| Publication Number | Publication Date |
|---|---|
| CN201766494U true CN201766494U (en) | 2011-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010202939702U Expired - Lifetime CN201766494U (en) | 2010-08-12 | 2010-08-12 | Bypass circuit of chain link in high-voltage chained static synchronization compensator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102710244A (en) * | 2012-05-17 | 2012-10-03 | 广东电网公司电力科学研究院 | Middle-high voltage series-connection electronic switch |
| CN103066580A (en) * | 2012-10-30 | 2013-04-24 | 中国科学院电工研究所 | Fault protection applied to wind power plant and energy stabilization circuit |
| CN104779943A (en) * | 2015-04-14 | 2015-07-15 | 张家港智电西威变流技术有限公司 | Forced turn-off type thyristor bypass circuit |
-
2010
- 2010-08-12 CN CN2010202939702U patent/CN201766494U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102710244A (en) * | 2012-05-17 | 2012-10-03 | 广东电网公司电力科学研究院 | Middle-high voltage series-connection electronic switch |
| CN102710244B (en) * | 2012-05-17 | 2016-05-11 | 广东电网公司电力科学研究院 | A kind of mesohigh series connection electronic switch |
| CN103066580A (en) * | 2012-10-30 | 2013-04-24 | 中国科学院电工研究所 | Fault protection applied to wind power plant and energy stabilization circuit |
| CN103066580B (en) * | 2012-10-30 | 2015-09-16 | 中国科学院电工研究所 | A kind of error protection for wind energy turbine set and energy stabilization circuit |
| CN104779943A (en) * | 2015-04-14 | 2015-07-15 | 张家港智电西威变流技术有限公司 | Forced turn-off type thyristor bypass circuit |
| CN104779943B (en) * | 2015-04-14 | 2017-11-24 | 北京西威清拓变流技术有限公司 | One kind bypass controllable silicon is forced shutdown circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110316 |
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| CX01 | Expiry of patent term |