CN106058888A - Thyristor soft switch switching circuit of static reactive power compensator and control method - Google Patents

Thyristor soft switch switching circuit of static reactive power compensator and control method Download PDF

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Publication number
CN106058888A
CN106058888A CN201610550079.4A CN201610550079A CN106058888A CN 106058888 A CN106058888 A CN 106058888A CN 201610550079 A CN201610550079 A CN 201610550079A CN 106058888 A CN106058888 A CN 106058888A
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igct
voltage
capacitor
thyristor
control
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CN106058888B (en
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魏业文
杨苗
王辉
程江洲
黄悦华
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China Three Gorges University CTGU
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China Three Gorges University CTGU
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1864—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein the stepless control of reactive power is obtained by at least one reactive element connected in series with a semiconductor switch
    • 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 relates to a thyristor soft switch switching circuit of a static reactive power compensator and a control method. The thyristor soft switch switching circuit comprises a power grid, a thyristor control reactor TCR, a thyristor switching capacitor TSC and a control circuit, wherein the thyristor control reactor TCR and the thyristor switching capacitor TSC are connected in parallel and are then accessed to the power grid, and the control circuit comprises a phase detection module, a reactive detection and control amount calculation module, signal generators 1# and 2# and driving circuits 1-4. According to the thyristor soft switch switching circuit, thyristor TC and TL control on the TSC and the TCR is realized respectively through taking a power grid voltage phase as reference, and a period and a phase for TC and TL conduction triggering are determined according to magnitude of target control amount. The thyristor soft switch switching circuit does not includes an energy consumption resistor, a bridge diode rectification unit is additionally arranged, only one thyristor is employed for the TSC or the TCR, and bidirectional electric energy control can be realized.

Description

The IGCT Soft Switching circuit of a kind of static var compensator and control method
Technical field
The present invention relates to control power system reactive power field, the IGCT Sofe Switch of a kind of static var compensator Switching circuit and control method.
Background technology
Reactive-load compensation is the major way controlling power system reactive power balance, is also guarantee power grid security, stablizes and reliable The key run.Static var compensator (SVC) is the reactive-load compensation equipment being most widely used in current electric grid, and it comprises crystalline substance Brake tube controls reactor (TCR) and thuristor throw-in and throw-off reactor (TSC), and the former plays and continuously adjusts the effect that perception is idle, after Person provides discrete capacitive reactive power, and the two is applied in combination and can realize continuous reactive control.
In power system, SVC is typically mounted at the occasion such as current conversion station, Circuit Fault on Secondary Transformer, operational voltage level and electricity Current capacity is the biggest, and for semiconductor switch-IGCT therein, too high voltage easily causes switch conduction moment Rush of current, too high electric current will also result in the voltge surge of switch OFF moment, voltage or the current over pulse peace to IGCT Row for the national games is totally unfavorable, will cause Frequent Accidents, and economic loss is serious.It addition, the automatic shutoff process of IGCT needs experience Longer forward and reverse Xining, easily produces bigger turn-off power loss, and is likely to result in turning off unsuccessfully.Sofe Switch controls Technology is suppression voltage or rush of current, reduction switching loss, ensures the effective ways of IGCT normal switch, the most by extensively General it is applied to field of power conversion.
In tradition SVC soft switch circuit, typically IGCT is connected with low reactance, play the effect of current limliting；And by little Electric capacity is in parallel with IGCT, plays the effect of pressure limiting and the change of current；It addition, circuit also needs anti-paralleled diode and resistance branch, Energy expenditure remaining in small inductor or small capacitances is fallen.
Summary of the invention
The technical problem to be solved in the present invention is to provide the IGCT Soft Switching circuit of a kind of static var compensator And control method, compared with prior art, the present invention does not contains energy consumption resistor, adds bridge diode rectification unit, but at TSC Or only with an IGCT (prior art needs two) in TCR, the double-direction control of electric energy can be realized.
For solving above-mentioned technical problem, the technical solution adopted in the present invention is:
The IGCT Soft Switching circuit of a kind of static var compensator, including electrical network, thyristor-controlled reactor TCR, thyristor switchable capacitor TSC, control circuit；Described electrical network includes high voltage bus L0, step-down transformer T, downconverter The secondary side of device T is directly connected with one end of the in thyristor-controlled reactor TCR second uncontrollable rectifier bridge AC, and this connects Node is simultaneously connected with one end of AC capacitor C in thyristor switchable capacitor TSC, one end of the first uncontrollable rectifier bridge, i.e. AC capacitor C and the first uncontrollable rectifier bridge, the second uncontrollable rectifier bridge are parallel relationship；
Thyristor switchable capacitor TSC includes thuristor throw-in and throw-off circuit, AC capacitor C, the first uncontrollable rectifier bridge AC is the most in parallel with AC capacitor C, the other end ground connection of the two；
Thuristor throw-in and throw-off circuit comprises the first uncontrollable rectifier bridge, IGCT TC, small inductor LsC1And LsC2, DC capacitor CsC, MOSFET SC, small inductor LsC1And LsC2Connect, and the node of the two meets DC capacitor CsCOne end, DC capacitor The other end and MOSFET SCDrain electrode be connected；Small inductor LsC1Another terminate the positive pole of the first uncontrollable rectifier bridge, little Inductance LsC2Another termination IGCT TCAnode, IGCT negative electrode and SCSource electrode together with the negative pole of the first uncontrollable rectifier bridge It is connected；
Thyristor-controlled reactor TCR includes thyristor control circuit, reactor L, and thyristor control circuit is by second not Controllable rectifier bridge, IGCT TL, small inductor LsL1And LsL2, DC capacitor CsL, MOSFET SLComposition；Second is uncontrollable whole Another exchange end of stream bridge is connected with reactor L one end, the other end ground connection of reactor L；Small inductor LsL1And LsL2Series connection, and two The node of person meets DC capacitor CsLOne end, DC capacitor CsLThe other end and MOSFET SLDrain electrode be connected, small inductor LsL1Another terminate the positive pole of the second uncontrollable rectifier bridge, small inductor LsL2Another termination IGCT TLAnode, IGCT TL Negative electrode and MOSFET SLSource electrode negative pole with the second uncontrollable rectifier bridge together is connected；
Control circuit 2. include phase detecting module, idle Detection & Controling amount computing module, the first signal generator and First signal generator, drive circuit 1～4；Phase detecting module input is mains voltage signal ugrid, phase detecting module Outfan is voltage-phase θ；The input that idle Detection & Controling amount computing module calculates is θ and power network current signal Igrid, defeated Go out respectively controlling angled a1And α2；The input quantity of the first signal generator and the first signal generator is θ, α1And α2, it is output as half Conductor switch gate pole control signal Gate1～Gate4；The input quantity of drive circuit 1～4 is respectively Gate1～Gate4, respectively Output TS、TL、SCAnd SLGate pole control signal Gate1, Gate2, Gate SCWith Gate SL.IGCT for TSC and TCR TCWith TLControl, all with electric network voltage phase as reference, according to the size of target control amount, determine triggering TCWith TLConducting Cycle and phase place.
Described first uncontrollable rectifier bridge comprises DC1～DC4Totally four Power Diode Pumped, and DC1And DC3A bridge in series Arm, DC2And DC4B brachium pontis in series；The midpoint of a brachium pontis is connected with one end of electric capacity C, and the other end is connected with the midpoint of b brachium pontis； DC1And DC2Common cathode, DC3And DC4Common-anode；Above-mentioned common cathode contact and LsC1One end be connected, LsC1And LsC2Series connection is followed by TC's Anode, above-mentioned common-anode node is directly and TCNegative electrode be connected；Ac capacitor CsCOne termination LsC1And LsC2Junction point, the other end With SCDrain electrode be connected, SCSource electrode and TCNegative electrode be connected.
Described second uncontrollable rectifier bridge comprises DL1～DL4Totally four Power Diode Pumped, and DL1And DL3C bridge in series Arm, DL2And DL4D brachium pontis in series；The midpoint of c brachium pontis is connected with electrical network, and the midpoint of d brachium pontis is connected with one end of reactor L, L other end ground connection；DL1And DL2Common cathode, DL3And DL4Common-anode；Above-mentioned common cathode contact and LsL1One end be connected, LsL1And LsL2 Series connection deutomerite TLAnode, above-mentioned common-anode node is directly and TLNegative electrode be connected；Ac capacitor CsLOne termination LsL1And LsL2's Junction point, the other end and SLDrain electrode be connected, SLSource electrode and TLNegative electrode be connected.IGCT T for TSC and TCRCWith TL's Control, all with electric network voltage phase as reference, triggering T will be determined according to the size of target control amountCWith TLConducting cycle and Phase place.
A kind of IGCT Soft Switching circuit control method of static var compensator, line voltage is sinusoidal wave, when When being in positive half cycle, thyristor switchable capacitor TSC works in forward and cuts out pattern and forward puts into operation pattern；Their electric current road Footpath is respectively as follows: electrical network → DC1→LsC1→LsC2→TC→DC4→ ground and electrical network → AC capacitor C → ground；
When being in negative half period, thyristor switchable capacitor TSC works and reversely cuts out pattern and the pattern that reversely puts into operation, point Not their current path is respectively as follows: ground → DC2→LsC1→LsC2→TC→DC3→ electrical network and ground → AC capacitor C → electrical network.
A kind of IGCT Soft Switching circuit control method of static var compensator, capacitor switching moment, brilliant lock Front C opened by pipeSCBeing in full state of charge, its voltage swing is equivalent to alternating voltage amplitude, TCAnode-cathode voltage be just Partially；When IGCT is opened, TCOn the electric current that flows through come from electrical network and CSCElectric discharge, constitutes X and Y loop, opens electricity greatly Stream makes IGCT rapidly enter saturation conduction state；Due to LSC2Less, TCAnd CSCTerminal voltage equal, and CSCThe least, its end Voltage rapidly drops to the value close to zero, it is thereby achieved that the low-power consumption of IGCT, fast conducting；
In X loop, work as CSCNegative pole upper end be positive voltage when rising maximum, loop current drops to zero；Need to turn off During IGCT, open SC, make electric capacity CSCElectric discharge, electric current is quickly transferred to CSCOn, form loop Z, make IGCT T simultaneouslyCBear Counter voltage so that it is turn off and accelerate；And CSCForward end voltage slowly rise, and T this momentCEarly have been turned off, i.e. switching loss is zero.
A kind of IGCT Soft Switching circuit control method of static var compensator, two kinds of conduction modes of TCR, i.e. Forward conduction mode and reverse conduction mode, when IGCT turns off, the upper no current of L；When line voltage is positioned at positive half cycle, control TLMaking TCR be operated in forward conduction mode, current path is: electrical network → DL1→LsL1→LsL2→TL→DL4→ ground；When electrical network electricity When pressure is positioned at negative half period, T can be controlledLMaking TCR be operated in reverse conduction mode, as shown in Fig. 5 (b), current path is: ground → DL2 →LsL1→LsL2→TL→DL3→ electrical network.
The IGCT Soft Switching circuit control method of a kind of static var compensator, IGCT opens front CSLIt is in full State of charge, its voltage swing is equivalent to alternating voltage amplitude, TLAnode-cathode voltage be positively biased；When IGCT is opened, TLOn the electric current that flows through come from electrical network and CSLElectric discharge, constitutes U and V loop, opens electric current greatly and make IGCT rapidly enter Saturation conduction state；Due to LSL2Less, TLAnd CSLTerminal voltage equal, and CSLThe least, its terminal voltage rapidly drops to close In the value of zero, it is thereby achieved that the low-power consumption of IGCT, fast conducting；In V loop, work as CSLCathode voltage rise maximum Time, loop current drops to zero；When needing cutoff thyristor, open SL, make electric capacity CSLElectric discharge, electric current is quickly transferred to CSLOn, Form loop W, make IGCT T simultaneouslyLBear counter voltage so that it is turn off and accelerate；And CSLForward end voltage slowly rise, and this Carve TLEarly have been turned off, i.e. switching loss is zero.
The IGCT Soft Switching circuit control method of a kind of static var compensator, for the IGCT of TSC and TCR TCWith TLControl, all with electric network voltage phase as reference, according to the size of target control amount, determine triggering TCWith TLConducting Cycle and phase place, concretely comprise the following steps: control circuit electric network voltage phase to be detected, detection reactive power also calculates target control Amount processed, then target control amount is converted to control waveform by signal generator, after through drive circuit, control the door of IGCT The most open-minded.
The IGCT Soft Switching circuit of a kind of static var compensator of the present invention and control method, the concrete table of its advantage It is now three below aspect:
(1) in TSC or TCR, IGCT soft switch circuit only comprise one group of single-phase bridge diode rectification unit, two Low reactance, a capacitor and an IGCT, compared with traditional method, although add bridge diode rectification unit, but subtract Lack an IGCT, actually can be substantially reduced cost.
(2) by above principle Analysis, IGCT is in opening process, and the speed entering saturation conduction is exceedingly fast, energy Enough it is substantially reduced turn-on consumption；In turn off process, it is possible to achieve zero-current switching, turn-off power loss almost can reduce to zero；Cause This, this technology has good Sofe Switch effect, and switching loss is the lowest.
(3) IGCT in circuit be made up of two small inductors and small capacitances ' T ' type buffer circuit is connected, right Good buffering effect is all played in voltage and current impact, desirably prevents overvoltage or overcurrent phenomenon occurs.
Accompanying drawing explanation
The invention will be further described with embodiment below in conjunction with the accompanying drawings:
Fig. 1 is the control block diagram of the present invention.
Fig. 2 (a) is the structure chart of the thyristor switchable capacitor TSC of the present invention.
Fig. 2 (b) is the structure chart of the thyristor-controlled reactor TCR of the present invention.
Fig. 3 (a) is that the mode of operation-forward of thyristor switchable capacitor cuts out ideograph.
Fig. 3 (b) is that the mode of operation-forward of thyristor switchable capacitor puts into operation ideograph.
Fig. 3 (c) is the mode of operation-reversely cut out ideograph of thyristor switchable capacitor.
Fig. 3 (d) be thyristor switchable capacitor mode of operation-reversely put into operation ideograph.
Fig. 4 (a) is the current loop figure (IGCT is open-minded) that TSC IGCT opens with shutdown moment.
Fig. 4 (b) is the current loop figure (IGCT shutoff) that TSC IGCT opens with shutdown moment.
Fig. 5 (a) is the forward conduction mode figure of TCR.
Fig. 5 (b) is the reverse conduction mode figure of TCR.
Fig. 6 (a) is the current loop (IGCT is open-minded) that TCR IGCT opens with shutdown moment.
Fig. 6 (b) is the current loop (IGCT closedown) that TCR IGCT opens with shutdown moment.
Detailed description of the invention
A kind of IGCT Soft Switching circuit of static var compensator, including electrical network 1., thyristor-controlled reactor TCR, thyristor switchable capacitor TSC, control circuit are 2.；1. described electrical network includes high voltage bus L0, step-down transformer T, blood pressure lowering The secondary side of transformator T is directly connected with one end of the in thyristor-controlled reactor TCR second uncontrollable rectifier bridge 2 AC, This connects node and is simultaneously connected with one end of AC capacitor C in thyristor switchable capacitor TSC, the first uncontrollable rectifier bridge 1 One end, i.e. AC capacitor C and first uncontrollable rectifier bridge the 1, second uncontrollable rectifier bridge 2 are parallel relationship；Thuristor throw-in and throw-off Capacitor TSC includes thuristor throw-in and throw-off circuit, AC capacitor C, and the AC of the first uncontrollable rectifier bridge 1 is directly and alternating current Container C is in parallel, the other end ground connection of the two；
Thuristor throw-in and throw-off circuit comprises the first uncontrollable rectifier bridge 1, IGCT TC, small inductor LsC1And LsC2, DC capacitor CsC, MOSFET SC, small inductor LsC1And LsC2Connect, and the node of the two meets DC capacitor CsCOne end, DC capacitor The other end and MOSFET SCDrain electrode be connected；Constitute ' T ' type structure, small inductor LsC1Another to terminate first uncontrollable The positive pole of rectifier bridge 1, small inductor LsC2Another termination IGCT TCAnode, IGCT negative electrode and SCSource electrode is together with first not The negative pole of controllable rectifier bridge 1 is connected；
Thyristor-controlled reactor TCR includes thyristor control circuit, reactor L, and thyristor control circuit is by second not Controllable rectifier bridge 2, IGCT TL, small inductor LsL1And LsL2, DC capacitor CsL, MOSFET SLComposition；Second is uncontrollable Another exchange end of rectifier bridge 2 is connected with reactor L one end, the other end ground connection of reactor L；Small inductor LsL1And LsL2Series connection, And the node of the two meets DC capacitor CsLOne end, DC capacitor CsLThe other end and MOSFET SLDrain electrode be connected, structure Become ' T ' type structure, small inductor LsL1Another terminate the positive pole of the second uncontrollable rectifier bridge 2, small inductor LsL2Another termination crystalline substance Brake tube TLAnode, IGCT TLNegative electrode and MOSFET SLSource electrode together with the negative pole phase of the second uncontrollable rectifier bridge 2 Even；
2. control circuit includes phase detecting module, idle Detection & Controling amount computing module, the first signal generator 1# With the first signal generator 2#, drive circuit 1～4；Phase detecting module input is mains voltage signal ugrid, phase-detection Module outfan is voltage-phase θ；The input that idle Detection & Controling amount computing module calculates is θ and power network current signal Igrid, output is respectively controlling angled a1And α2；The input quantity of the first signal generator 1# and the first signal generator 2# is θ, α1With α2, it is output as semiconductor switch gate pole control signal Gate1～Gate4；The input quantity of drive circuit 1～4 be respectively Gate1～ Gate4, exports T respectivelyS、TL、SCAnd SLGate pole control signal Gate1, Gate2, Gate SCWith Gate SL。
Phase detecting module detects line voltage u by Hall voltage sensorgrid, and use conventional software phase-lock loop Method, obtains the phase place of voltage, as idle Detection & Controling amount computing module, signal generator 1# and the phase of signal generator 1# Position reference.
Idle Detection & Controling amount computing module: this module is with line voltage ugrid, electric current igridIt is input quantity with phase theta, By calculating the power factor of electrical network, and comparing with reference value 1, its error is as initial controlled quentity controlled variable, and adoption rate amasss Point control method calculates target control amount, and output controls parameter alpha1And α2, respectively as signal generator 1# and signal generator The input signal of 1#.
Operation principle:
The SVC IGCT soft switch circuit that the present invention proposes comprises two parts of TSC and TCR, as it is shown in figure 1, TSC is with brilliant Brake tube switching circuit in parallel (or series connection), TCR connects (or series connection) with thyristor control circuit.Below by selective analysis Fig. 1 institute The circuit shown, shown in the concrete structure of TSC and TCR circuit such as Fig. 2 (a) and (b), its operation principle is described below respectively:
(1) as shown in Fig. 2 (a), dotted line frame is the concrete structure of the uncontrollable rectifier bridge 1 shown in Fig. 1, and it comprises DC1~ DC4Totally four Power Diode Pumped, and DC1And DC3A brachium pontis in series, DC2And DC4B brachium pontis in series；The midpoint of a brachium pontis with One end of electric capacity C is connected, and the other end is connected with the midpoint of b brachium pontis；DC1And DC2Common cathode, DC3And DC4Common-anode；Above-mentioned common cathode Contact and LsC1One end be connected, LsC1And LsC2Series connection is followed by TCAnode, above-mentioned common-anode node is directly and TCNegative electrode be connected； Ac capacitor CsCOne termination LsC1And LsC2Junction point, the other end and SCDrain electrode be connected, SCSource electrode and TCNegative electrode be connected.
(2) line voltage is sinusoidal wave, and when being in positive half cycle, TSC is operable with forward and cuts out pattern and forward puts into operation Pattern, respectively as shown in Fig. 3 (a) and (b), their current path is respectively as follows: electrical network → DC1→LsC1→LsC2→TC→DC4→ Ground and electrical network → C → ground；When being in negative half period, TSC can work and reversely cut out pattern and the pattern that reversely puts into operation, respectively such as figure Shown in 3 (c) and (d), their current path is respectively as follows: ground → DC2→LsC1→LsC2→TC→DC3→ electrical network and ground → C → electricity Net.
(3) capacitor switching moment, as shown in Figure 4, IGCT opens front C to the current loop of thuristor throw-in and throw-off circuitSCPlace In full state of charge, its voltage swing is equivalent to alternating voltage amplitude, TCAnode-cathode voltage be positively biased；When IGCT is opened Time logical, such as Fig. 4 (a), TCOn the electric current that flows through come from electrical network and CSCElectric discharge, constitutes X and Y loop, opens electric current greatly and make IGCT rapidly enters saturation conduction state；Due to LSC2Less, TCAnd CSCTerminal voltage equal, and CSCThe least, its terminal voltage Rapidly drop to the value close to zero, it is thereby achieved that the low-power consumption of IGCT, fast conducting；In X loop, work as CSCNegative When pole (upper end is just) voltage rises maximum, loop current drops to zero；When needing cutoff thyristor, such as Fig. 4 (b), open SC, Make electric capacity CSCElectric discharge, electric current is quickly transferred to CSCOn, form loop Z, make IGCT T simultaneouslyCBear counter voltage so that it is turn off and add Speed；And CSCForward end voltage slowly rise, and T this momentCEarly have been turned off, i.e. switching loss is zero；Visible, IGCT open and There is not voltage or voltge surge in turn off process, and is lost extremely low, i.e. achieves Soft Switching.
(4) shown in the structure chart of thyristor-controlled reactor TCR such as Fig. 2 (b), red dotted line frame be shown in Fig. 1 not The concrete structure of controllable rectifier bridge 2, it comprises DL1～DL4Totally four Power Diode Pumped, and DL1And DL3C brachium pontis in series, DL2 And DL4D brachium pontis in series；The midpoint of c brachium pontis is connected with electrical network, and the midpoint of d brachium pontis is connected with one end of reactor L, L another End ground connection；DL1And DL2Common cathode, DL3And DL4Common-anode；Above-mentioned common cathode contact and LsL1One end be connected, LsL1And LsL2Series connection Deutomerite TLAnode, above-mentioned common-anode node is directly and TLNegative electrode be connected；Ac capacitor CsLOne termination LsL1And LsL2Connection Point, the other end and SLDrain electrode be connected, SLSource electrode and TLNegative electrode be connected.
(5) as it is shown in figure 5, be two kinds of conduction modes of TCR, i.e. forward conduction mode and reverse conduction mode, IGCT During shutoff, the upper no current of L；When line voltage is positioned at positive half cycle, T can be controlledLTCR is made to be operated in forward conduction mode, such as Fig. 5 A, shown in (), current path is: electrical network → DL1→LsL1→LsL2→TL→DL4→ ground；When line voltage is positioned at negative half period, controlled T processedLMaking TCR be operated in reverse conduction mode, as shown in Fig. 5 (b), current path is: ground → DL2→LsL1→LsL2→TL→DL3 → electrical network.
(6) current loop of thyristor control circuit is as shown in Figure 6, and IGCT opens front CSLIt is in full state of charge, its Voltage swing is equivalent to alternating voltage amplitude, TLAnode-cathode voltage be positively biased；When IGCT is opened, such as Fig. 6 (a), TL On the electric current that flows through come from electrical network and CSLElectric discharge, constitutes U and V loop, and opening electric current greatly, to make IGCT rapidly enter full And conducting state；Due to LSL2Less, TLAnd CSLTerminal voltage equal, and CSLThe least, its terminal voltage rapidly drop to close to The value of zero, it is thereby achieved that the low-power consumption of IGCT, fast conducting；In V loop, work as CSLNegative pole (upper end is just) voltage When rising maximum, loop current drops to zero；When needing cutoff thyristor, such as Fig. 6 (b), open SL, make electric capacity CSLElectric discharge, electricity Stream is quickly transferred to CSLOn, form loop W, make IGCT T simultaneouslyLBear counter voltage so that it is turn off and accelerate；And CSLForward end Voltage slowly rises, and T this momentLEarly have been turned off, i.e. switching loss is zero；Visible, IGCT turns on and off process and does not exists Voltage or voltge surge, and it is lost extremely low, i.e. achieve Soft Switching.
(7) in above-mentioned SVC circuit, for the IGCT T of TSC and TCRCWith TLControl, with electric network voltage phase be all Reference, will determine triggering T according to the size of target control amountCWith TLThe cycle of conducting and phase place, concretely comprise the following steps: control circuit Electric network voltage phase to be detected, detection reactive power also calculates target control amount, then target control amount occurred by signal Device is converted to control waveform, after through drive circuit, the gate pole controlling IGCT is open-minded, and it is substantially in frame structure such as Fig. 1 Control circuit unit.

Claims (8)

1. an IGCT Soft Switching circuit for static var compensator, including electrical network (1.), thyristor-controlled reactor TCR, thyristor switchable capacitor TSC, control circuit (2.)；It is characterized in that:
Described electrical network (1.) includes high voltage bus L0, step-down transformer T, and the secondary side of step-down transformer T is directly and IGCT control In reactor TCR processed, one end of the second uncontrollable rectifier bridge (2) AC connects, and this connects node and is simultaneously connected with thuristor throw-in and throw-off One end of AC capacitor C, one end of the first uncontrollable rectifier bridge (1) in capacitor TSC, i.e. AC capacitor C and first is not Controllable rectifier bridge (1), the second uncontrollable rectifier bridge (2) are parallel relationship；
Thyristor switchable capacitor TSC includes thuristor throw-in and throw-off circuit, AC capacitor C, the friendship of the first uncontrollable rectifier bridge (1) Stream side is the most in parallel with AC capacitor C, the other end ground connection of the two；
Thuristor throw-in and throw-off circuit comprises the first uncontrollable rectifier bridge (1), IGCT TC, small inductor LsC1And LsC2, DC capacitor CsC、 MOSFET SC, small inductor LsC1And LsC2Connect, and the node of the two meets DC capacitor CsCOne end, DC capacitor another End and MOSFET SCDrain electrode be connected；Small inductor LsC1Another terminate the positive pole of the first uncontrollable rectifier bridge (1), little Inductance LsC2Another termination IGCT TCAnode, IGCT negative electrode and SCSource electrode together with the first uncontrollable rectifier bridge (1) Negative pole is connected；
Thyristor-controlled reactor TCR includes thyristor control circuit, reactor L, and thyristor control circuit is uncontrollable by second Rectifier bridge (2), IGCT TL, small inductor LsL1And LsL2, DC capacitor CsL, MOSFET SLComposition；Second is uncontrollable whole Another exchange end of stream bridge (2) is connected with reactor L one end, the other end ground connection of reactor L；Small inductor LsL1And LsL2Series connection, And the node of the two meets DC capacitor CsLOne end, DC capacitor CsLThe other end and MOSFET SLDrain electrode be connected, little Inductance LsL1Another terminate the positive pole of the second uncontrollable rectifier bridge (2), small inductor LsL2Another termination IGCT TLAnode, IGCT TLNegative electrode and MOSFET SLSource electrode negative pole with the second uncontrollable rectifier bridge (2) together is connected；
Control circuit (2.) includes phase detecting module, idle Detection & Controling amount computing module, the first signal generator (1#) With the first signal generator (2#), drive circuit 1～4；Phase detecting module input is mains voltage signal ugrid, phase place is examined Surveying module outfan is voltage-phase θ；The input that idle Detection & Controling amount computing module calculates is θ and power network current signal Igrid, output is respectively controlling angled a1And α2；The input quantity of the first signal generator (1#) and the first signal generator (2#) be θ, α1And α2, it is output as semiconductor switch gate pole control signal Gate1～Gate4；The input quantity of drive circuit 1～4 is respectively Gate1～Gate4, exports T respectivelyS、TL、SCAnd SLGate pole control signal Gate1, Gate2, Gate SCWith Gate SL.Right IGCT T in TSC and TCRCWith TLControl, all with electric network voltage phase as reference, according to the size of target control amount, Determine triggering TCWith TLThe cycle of conducting and phase place.
A kind of IGCT Soft Switching circuit of static var compensator, it is characterised in that: institute State the first uncontrollable rectifier bridge (1) and comprise DC1～DC4Totally four Power Diode Pumped, and DC1And DC3A brachium pontis in series, DC2With DC4B brachium pontis in series；The midpoint of a brachium pontis is connected with one end of electric capacity C, and the other end is connected with the midpoint of b brachium pontis；DC1And DC2 Common cathode, DC3And DC4Common-anode；Above-mentioned common cathode contact and LsC1One end be connected, LsC1And LsC2Series connection is followed by TCAnode, on State common-anode node directly and TCNegative electrode be connected；Ac capacitor CsCOne termination LsC1And LsC2Junction point, the other end and SC's Drain electrode is connected, SCSource electrode and TCNegative electrode be connected.
A kind of IGCT Soft Switching circuit of static var compensator, it is characterised in that: institute State the second uncontrollable rectifier bridge (2) and comprise DL1～DL4Totally four Power Diode Pumped, and DL1And DL3C brachium pontis in series, DL2With DL4D brachium pontis in series；The midpoint of c brachium pontis is connected with electrical network, and the midpoint of d brachium pontis is connected with one end of reactor L, the L other end Ground connection；DL1And DL2Common cathode, DL3And DL4Common-anode；Above-mentioned common cathode contact and LsL1One end be connected, LsL1And LsL2After series connection Joint TLAnode, above-mentioned common-anode node is directly and TLNegative electrode be connected；Ac capacitor CsLOne termination LsL1And LsL2Junction point, The other end and SLDrain electrode be connected, SLSource electrode and TLNegative electrode be connected.IGCT T for TSC and TCRCWith TLControl, all With electric network voltage phase as reference, triggering T to be determined according to the size of target control amountCWith TLThe cycle of conducting and phase place.
4. use the crystalline substance of the IGCT Soft Switching circuit of any one static var compensator as described in claims 1 to 3 Brake tube control method, it is characterised in that: line voltage is sinusoidal wave, when being in positive half cycle, thyristor switchable capacitor TSC work Make in forward and cut out pattern and forward puts into operation pattern；Their current path is respectively as follows: electrical network → DC1→LsC1→LsC2→TC→ DC4→ ground and electrical network → AC capacitor C → ground；
When being in negative half period, thyristor switchable capacitor TSC works and reversely cuts out pattern and the pattern that reversely puts into operation, and distinguishes it Current path be respectively as follows: ground → DC2→LsC1→LsC2→TC→DC3→ electrical network and ground → AC capacitor C → electrical network.
5. use the crystalline substance of the IGCT Soft Switching circuit of any one static var compensator as described in claims 1 to 3 Brake tube control method, it is characterised in that: capacitor switching moment, IGCT opens front CSCBeing in full state of charge, its voltage is big Little be equivalent to alternating voltage amplitude, TCAnode-cathode voltage be positively biased；When IGCT is opened, TCOn the electric current that flows through from In electrical network and CSCElectric discharge, constitutes X and Y loop, opens electric current greatly and make IGCT rapidly enter saturation conduction state；Due to LSC2Less, TCAnd CSCTerminal voltage equal, and CSCThe least, its terminal voltage rapidly drops to the value close to zero, therefore, real The low-power consumption of IGCT, fast conducting are showed；
In X loop, work as CSCNegative pole upper end be positive voltage when rising maximum, loop current drops to zero；Need to turn off brilliant lock Guan Shi, opens SC, make electric capacity CSCElectric discharge, electric current is quickly transferred to CSCOn, form loop Z, make IGCT T simultaneouslyCBear anti-electricity Pressure so that it is turn off and accelerate；And CSCForward end voltage slowly rise, and T this momentCEarly have been turned off, i.e. switching loss is zero.
6. use the crystalline substance of the IGCT Soft Switching circuit of any one static var compensator as described in claims 1 to 3 Brake tube control method, it is characterised in that: two kinds of conduction modes of TCR, i.e. forward conduction mode and reverse conduction mode, IGCT During shutoff, the upper no current of L；When line voltage is positioned at positive half cycle, control TLTCR is made to be operated in forward conduction mode, electric current road Footpath is: electrical network → DL1→LsL1→LsL2→TL→DL4→ ground；When line voltage is positioned at negative half period, T can be controlledLTCR is made to work At reverse conduction mode, current path is: ground → DL2→LsL1→LsL2→TL→DL3→ electrical network.
7. use the crystalline substance of the IGCT Soft Switching circuit of any one static var compensator as described in claims 1 to 3 Brake tube control method, it is characterised in that: IGCT opens front CSLBeing in full state of charge, its voltage swing is equivalent to alternating voltage Amplitude, TLAnode-cathode voltage be positively biased；When IGCT is opened, TLOn the electric current that flows through come from electrical network and CSLElectric discharge, Constitute U and V loop, open electric current greatly and make IGCT rapidly enter saturation conduction state；Due to LSL2Less, TLAnd CSL's Terminal voltage is equal, and CSLThe least, its terminal voltage rapidly drops to the value close to zero, it is thereby achieved that the low merit of IGCT Consumption, fast conducting；In V loop, work as CSLCathode voltage when rising maximum, loop current drops to zero；Need to turn off brilliant lock Guan Shi, opens SL, make electric capacity CSLElectric discharge, electric current is quickly transferred to CSLOn, form loop W, make IGCT T simultaneouslyLBear anti-electricity Pressure so that it is turn off and accelerate；And CSLForward end voltage slowly rise, and T this momentLEarly have been turned off, i.e. switching loss is zero.
8. use the crystalline substance of the IGCT Soft Switching circuit of any one static var compensator as described in claims 1 to 3 Brake tube control method, it is characterised in that: for the IGCT T of TSC and TCRCWith TLControl, all with electric network voltage phase for ginseng Examine, triggering T will be determined according to the size of target control amountCWith TLThe cycle of conducting and phase place, concretely comprise the following steps: control circuit is first Electric network voltage phase to be detected, detection reactive power also calculates target control amount, then target control amount is passed through signal generator Be converted to control waveform, after through drive circuit, the gate pole controlling IGCT is open-minded.
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