CN201839012U - Startup charging and shutdown discharging circuit of static var generator - Google Patents
Startup charging and shutdown discharging circuit of static var generator Download PDFInfo
- Publication number
- CN201839012U CN201839012U CN2010205995314U CN201020599531U CN201839012U CN 201839012 U CN201839012 U CN 201839012U CN 2010205995314 U CN2010205995314 U CN 2010205995314U CN 201020599531 U CN201020599531 U CN 201020599531U CN 201839012 U CN201839012 U CN 201839012U
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- phase contactor
- inverter
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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
- Y02E40/20—Active power filtering [APF]
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Abstract
The utility model discloses a startup charging and shutdown discharging circuit of a static var generator, which is invented for solving the problems of complicated circuit, low reliability and the like in the prior art. The circuit is connected between the alternating-current output end of the static var generator or an active filter and a power supply, the alternating-current output end of the static var generator or the active filter is connected with an inverter, and the circuit comprises three current-limiting resistors, a first phase contactor, a second phase contactor, a third phase contactor, a first fuse group and a second fuse group; and the first fuse group and the second fuse group respectively comprise three fuses. The circuit structure not only solves the problem of startup charging, but also solves the problem of shutdown discharging; and a selected switching element has small current capacity, a simple structure and a low cost, avoids adopting a separately-excited startup charging circuit, a large-capacity transfer switch and an additional discharging current-limiting resistor and lowers the equipment cost.
Description
Technical field
The utility model relates to a kind of startup charging of static reacance generator and shuts down discharge circuit.
Background technology
Static reacance generator (SVG) and active power filter all are based on the power quality controlling device of voltage source inverter.Except equipment loss, such device does not generally exchange with electrical network generation active power, so its inverter direct-flow side supply voltage only need adopt capacitor (group) to keep.When such device does not put into operation, be assurance equipment and personal safety, do not answer stored energy on the capacitor, promptly voltage is 0V on the capacitor.In this case, the output of inverter AC side can only be 0V, drops into electrical network if directly will install, and will cause very big inrush phenomenon, the safety of harm operating personnel, device, electrical network; In order to keep the stable of dc voltage, the dc bus capacitor capacity of such device is chosen generally bigger.If only rely on the leakage current of element self to discharge the energy of capacitance stores, will cause the voltage that in for a long time existence can the serious threat personal safety.Therefore, must design suitable discharge circuit speed-up capacitor discharge process, and in discharge circuit, need one group of discharge current-limiting resistance equally; Under the application scenario of nominal operation higher (6-35kV), adopting separate excitation to start charging has suitable realization difficulty; Direct series limiting resistor, the mode of after charging finishes the current-limiting resistance short circuit being excised needs the short switch of high current capacity; She Ji discharge circuit makes DC side circuit complexity in addition, and reliability reduces.
The utility model content
In order to overcome above-mentioned defective, the purpose of this utility model is the startup charging of the lower static reacance generator of a kind of equipment cost to be provided and to shut down discharge circuit.
In order to achieve the above object, the startup of static reacance generator of the present utility model charging and shutdown discharge circuit comprise three current-limiting resistances, first three-phase contactor, second three-phase contactor, the first fuse group, the second fuse group; Described first, second fuse group comprises three fuses respectively; Three contacts of described first three-phase contactor, three fuses of the first fuse group, three current-limiting resistance series connection respectively successively; Three fuses of the described second fuse group are connected respectively with three contact in turn of second three-phase contactor respectively, the second three-phase contactor other end short circuit; An other end of second group of fuse is connected to the current-limiting resistance and the first fuse group junction respectively; The first three-phase contactor other end and three current-limiting resistance other end polyphones at two ends insert between the ac output end and power supply of static reacance generator or active filter, and the ac output end of described static reacance generator or active filter connects inverter.
Wherein, described inverter is delta connection H bridge cascaded inverter, star connection H bridge cascaded inverter or three brachium pontis three-phase bridge inverters.
Above-mentioned structure, circuit had both solved and had started the charging problem, solved the discharge problem of shutting down again; Selected switch element current capacity is little, simple in structure, and cost is low, avoids adopting separate excitation to start charging circuit, big capacity diverter switch, extra discharge current-limiting resistance, has reduced equipment cost.
Description of drawings
Fig. 1 is the structural representation of the utility model first specific embodiment.
Fig. 2 is the structural representation of the utility model second specific embodiment.
Fig. 3 is the structural representation of the utility model the 3rd specific embodiment.
Embodiment
Below in conjunction with drawings and Examples the utility model is described in further detail.
As shown in Figure 1 and Figure 2, the startup charging of static reacance generator of the present utility model and first specific embodiment of shutdown discharge circuit, as shown in Figure 1: first three-phase contactor 1, second three-phase contactor 2, current-limiting resistance 3,4,5, three fuses 9,10,11 of three fuse 6,7,8, the second fuse groups of the first fuse group, said elements constitutes the utility model circuit structure; The static reacance generator circuit breaker 12 that is incorporated into the power networks, the H bridge cascaded inverter 13 of delta connection.Before the startup, each power electronics thyristor is in the pulse blocking state, and each contactor, circuit breaker are in gate-dividing state, not energy storage on the electric capacity, and dc voltage is 0V.
During startup, keep the power electronics thyristor still to be in the pulse blocking state, second three-phase contactor 2 and the static reacance generator circuit breaker 12 that is incorporated into the power networks keeps gate-dividing states, controls first three-phase contactor 1 and makes it the contact and close a floodgate.At this moment, electrical network is by contact, the fuse 6,7,8 of contactor 1, current-limiting resistance 3,4,5, and the bridge-type that constitutes of the built-in inverse parallel fly-wheel diode of power electronics thyristor not control rectifying circuit dc bus capacitor is charged, capacitance voltage rises thereupon.When voltage reaches set point on the electric capacity, keep second three-phase contactor, 2 gate-dividing states, control first three-phase contactor, 1 separating brake; Control be incorporated into the power networks circuit breaker 12 of static reacance generator subsequently and close a floodgate, this moment, inrush phenomenon was less, can not cause the impact to electrical network and equipment; Remove the pulse blocking of power electronics thyristor at last, device changes normal operation over to.
When the device preparation is out of service, at first block the driving pulse of power electronics thyristor, control circuit breaker 12 separating brakes that are incorporated into the power networks; The gate-dividing state that keeps first three-phase contactor 1, control are separated tentaculum 2 and are closed a floodgate, and remove the pulse blocking of power electronics thyristor again.At this moment, inverter exchanges outlet side, current-limiting resistance 3,4,5, and the contact of fuse 9,10,11, the second three-phase contactors 2 forms the loop, and the energy of storing on the dc bus capacitor can discharge gradually by current-limiting resistance.After dc voltage is reduced to safe range, block the pulse of power electronics thyristor, control second three-phase contactor, 2 separating brakes.
Fig. 2 and Fig. 3 have provided second, third specific embodiment of the present utility model, and wherein the form of inverter 14 is the H bridge cascaded inverter and the three brachium pontis three-phase bridge inverters of star connection, and operation principle is identical with first specific embodiment separately.
The utility model is applicable to that also other adopt capacitors to support the power electronic equipment of dc voltages, as the lateral circuit in parallel of active electric-power filter, unified trend control etc.
The utility model is not limited to above-mentioned execution mode; no matter on its shape or structure, do any variation; every startup charging that utilizes above-mentioned static reacance generator and to shut down discharge circuit all be a kind of distortion of the present utility model all should be thought and drop within the utility model protection range.
Claims (4)
1. the startup of static reacance generator charging and shutdown discharge circuit is characterized in that: comprise three current-limiting resistances, first three-phase contactor, second three-phase contactor, the first fuse group, the second fuse group; Described first, second fuse group comprises three fuses respectively; Three contacts of described first three-phase contactor, three fuses of the first fuse group, three current-limiting resistance series connection respectively successively; Three fuses of the described second fuse group are connected respectively with three contact in turn of second three-phase contactor respectively, the second three-phase contactor other end short circuit; An other end of second group of fuse is connected to the current-limiting resistance and the first fuse group junction respectively; The first three-phase contactor other end and three current-limiting resistance other end polyphones at two ends insert between the ac output end and power supply of static reacance generator or active filter, and the ac output end of described static reacance generator or active filter connects inverter.
2. the startup of static reacance generator as claimed in claim 1 charging and shutdown discharge circuit is characterized in that described inverter is a delta connection H bridge cascaded inverter.
3. the startup of static reacance generator as claimed in claim 1 charging and shutdown discharge circuit is characterized in that described inverter is a star connection H bridge cascaded inverter.
4. the startup of static reacance generator as claimed in claim 1 charging and shutdown discharge circuit is characterized in that described inverter is three brachium pontis three-phase bridge inverters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205995314U CN201839012U (en) | 2010-11-10 | 2010-11-10 | Startup charging and shutdown discharging circuit of static var generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205995314U CN201839012U (en) | 2010-11-10 | 2010-11-10 | Startup charging and shutdown discharging circuit of static var generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201839012U true CN201839012U (en) | 2011-05-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205995314U Expired - Fee Related CN201839012U (en) | 2010-11-10 | 2010-11-10 | Startup charging and shutdown discharging circuit of static var generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201839012U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158227A (en) * | 2014-07-30 | 2014-11-19 | 浙江海得新能源有限公司 | Control method for converter |
| CN104167737A (en) * | 2014-05-28 | 2014-11-26 | 白晓民 | Charge and discharge protection circuits of APF/SVG direct current capacitor and method |
| CN107612042A (en) * | 2017-08-17 | 2018-01-19 | 南京理工大学 | Synchronous capacitor based on the big impedance of pre-access starts parallel network circuit and control method |
-
2010
- 2010-11-10 CN CN2010205995314U patent/CN201839012U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104167737A (en) * | 2014-05-28 | 2014-11-26 | 白晓民 | Charge and discharge protection circuits of APF/SVG direct current capacitor and method |
| CN104167737B (en) * | 2014-05-28 | 2017-12-19 | 白晓民 | A kind of charge-discharge protection circuit and method of APF/SVG DC capacitors |
| CN104158227A (en) * | 2014-07-30 | 2014-11-19 | 浙江海得新能源有限公司 | Control method for converter |
| CN107612042A (en) * | 2017-08-17 | 2018-01-19 | 南京理工大学 | Synchronous capacitor based on the big impedance of pre-access starts parallel network circuit and control method |
| CN107612042B (en) * | 2017-08-17 | 2020-07-07 | 南京理工大学 | Synchronous phase modulator starting grid-connected circuit based on pre-access large impedance and control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: MCC Alex Hua Tian Ma'anshan power filter Co., Ltd. Assignor: Zhongye Huatian Engineering Technology Co., Ltd. Contract record no.: 2011340000366 Denomination of utility model: Startup charging and shutdown discharging circuit of static var generator Granted publication date: 20110518 License type: Exclusive License Record date: 20110824 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110518 Termination date: 20191110 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |