CN106058888B - A kind of the thyristor Soft Switching circuit and control method of static var compensator - Google Patents

A kind of the thyristor Soft Switching circuit and control method of static var compensator Download PDF

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CN106058888B
CN106058888B CN201610550079.4A CN201610550079A CN106058888B CN 106058888 B CN106058888 B CN 106058888B CN 201610550079 A CN201610550079 A CN 201610550079A CN 106058888 B CN106058888 B CN 106058888B
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thyristor
capacitor
phase
small inductor
rectifier bridge
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CN106058888A (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]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

A kind of the thyristor Soft Switching circuit and control method of static var compensator, including power grid, thyristor-controlled reactor TCR, thyristor switchable capacitor TSC, control circuit.Power grid is accessed after thyristor-controlled reactor TCR is in parallel with thyristor switchable capacitor TSC.Control circuit part includes phase detecting module, idle Detection & Controling amount computing module, signal generator 1# and 2#, driving circuit 1~4.For the thyristor T of TSC and TCRCWith TLControl, with electric network voltage phase be reference, according to the size of target control amount, determine triggering TCWith TLThe period of conducting and phase.The present invention is free of energy consumption resistor, increases bridge diode rectification unit, but the double-direction control of electric energy can be realized only with a thyristor in TSC or TCR.

Description

A kind of the thyristor Soft Switching circuit and control method of static var compensator
Technical field
The present invention relates to control power system reactive power field, the thyristor Sofe Switch of specifically a kind of static var compensator Switching circuit and control method.
Background technique
Reactive compensation is the major way for controlling power system reactive power balance, and ensures power grid security, stabilization and reliable The key of operation.Static var compensator (SVC) is the reactive-load compensation equipment being most widely used in current electric grid, it includes crystalline substance Brake tube controls reactor (TCR) and thuristor throw-in and throw-off reactor (TSC), the former plays the role of continuously adjusting inductive reactive power, after Person provides discrete capacitive reactive power, and the two, which is applied in combination, can be realized continuous reactive control.
In the power system, SVC is typically mounted at the occasions such as converter station, Circuit Fault on Secondary Transformer, operational voltage level and electricity Current capacity is all very big, and for semiconductor switch-thyristor therein, excessively high voltage be easy to cause switch conduction moment Rush of current, excessively high electric current will also result in the voltge surge of switch OFF moment, voltage or current over pulse to the peace of thyristor Row for the national games is totally unfavorable, will lead to Frequent Accidents, and economic loss is serious.In addition, the automatic shutoff process of thyristor needs to undergo Longer forward and reverse Xining, is easy to produce biggish turn-off power loss, and is likely to result in shutdown failure.Sofe Switch control Technology is to inhibit voltage or rush of current, reduce switching loss, ensures the effective ways of thyristor normal switch, wide at present It is general to be applied to field of power conversion.
In traditional SVC soft switch circuit, thyristor is connected with low reactance generally, plays the role of current limliting；And it will be small Capacitor is in parallel with thyristor, plays the role of pressure limiting and the change of current；In addition, anti-paralleled diode and resistance branch are also needed in circuit, Energy consumption 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 a kind of thyristor Soft Switching circuits of static var compensator And control method, compared with prior art, the present invention is free of energy consumption resistor, increases bridge diode rectification unit, but in TSC Or the double-direction control of electric energy can be realized only with a thyristor (needing two in the prior art) in TCR.
In order to solve the above technical problems, the technical scheme adopted by the invention is that:
A kind of thyristor Soft Switching circuit of static var compensator, including power grid, thyristor-controlled reactor TCR, thyristor switchable capacitor TSC, control circuit；The power grid includes high voltage bus L0, step-down transformer T, downconverter The secondary side of device T is directly connect with one end of the in thyristor-controlled reactor TCR second uncontrollable rectifier bridge exchange side, this connection Node connects one end of one end of AC capacitor C in thyristor switchable capacitor TSC, the first uncontrollable rectifier bridge simultaneously, i.e., The uncontrollable rectifier bridge of AC capacitor C and first, 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 Exchange side is directly in parallel with AC capacitor C, the other end ground connection of the two；
Thuristor throw-in and throw-off circuit includes the first uncontrollable rectifier bridge, thyristor TC, small inductor LsC1And LsC2, DC capacitor CsC, Power MOSFET SC, small inductor LsC1And LsC2Series connection, and the node of the two meets DC capacitor CsCOne end, DC capacitor The other end and Power MOSFET SCDrain electrode be connected；Small inductor LsC1The uncontrollable rectifier bridge of another termination first anode, it is small Inductance LsC2Another termination thyristor TCAnode, thyristor cathode and SCThe source electrode cathode with the first uncontrollable rectifier bridge together It is connected；
Thyristor-controlled reactor TCR includes thyristor control circuit, reactor L, thyristor control circuit by second not Controllable rectifier bridge, thyristor TL, small inductor LsL1And LsL2, DC capacitor CsL, Power MOSFET SLComposition；Second is uncontrollable whole Another exchange end of stream bridge is connected with the one end reactor L, 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 Power MOSFET SLDrain electrode be connected, small inductor LsL1The uncontrollable rectifier bridge of another termination second anode, small inductor LsL2Another termination thyristor TLAnode, thyristor TL Cathode and Power MOSFET SLSource electrode is connected with the cathode of the second uncontrollable rectifier bridge together；
Control circuit 2. include phase detecting module, idle Detection & Controling amount computing module, the first signal generator and First signal generator, driving circuit 1~4；Phase detecting module input terminal is mains voltage signal ugrid, phase detecting module Output end is voltage-phase θ；The input that idle Detection & Controling amount computing module calculates is θ and power network current signal Igrid, defeated It is out respectively controlling angled a1And α2；The input quantity of first signal generator and the first signal generator is θ, α1And α2, exporting is half Conductor switchs gate pole and controls signal Gate1~Gate4；The input quantity of driving circuit 1~4 is respectively Gate1~Gate4, respectively Export TS、TL、SCAnd SLGate pole control signal Gate1, Gate2, Gate SCWith Gate SL.For the thyristor of TSC and TCR TCWith TLControl, with electric network voltage phase be reference, according to the size of target control amount, determine triggering TCWith TLConducting Period and phase.
The first uncontrollable rectifier bridge includes DC1~DC4Totally four Power Diode Pumpeds, and DC1And DC3A bridge in series Arm, DC2And DC4B bridge arm in series；The midpoint of a bridge arm is connected with one end of capacitor C, and the other end is connected with the midpoint of b bridge arm； DC1And DC2Common cathode, DC3And DC4Common-anode；Above-mentioned common cathode polar contact and LsC1One end be connected, LsC1And LsC2Series connection is followed by TC's Anode, above-mentioned common-anode node is directly and TCCathode be connected；Ac capacitor CsCOne termination LsC1And LsC2Tie point, the other end With SCDrain electrode be connected, SCSource electrode and TCCathode be connected.
The second uncontrollable rectifier bridge includes DL1~DL4Totally four Power Diode Pumpeds, and DL1And DL3C bridge in series Arm, DL2And DL4D bridge arm in series；The midpoint of c bridge arm is connected with power grid, and the midpoint of d bridge arm is connected with one end of reactor L, L other end ground connection；DL1And DL2Common cathode, DL3And DL4Common-anode；Above-mentioned common cathode polar contact and LsL1One end be connected, LsL1And LsL2 Connect deutomerite TLAnode, above-mentioned common-anode node is directly and TLCathode be connected；Ac capacitor CsLOne termination LsL1And LsL2's Tie point, the other end and SLDrain electrode be connected, SLSource electrode and TLCathode be connected.For the thyristor T of TSC and TCRCWith TL's Control is reference with electric network voltage phase, to determine triggering T according to the size of target control amountCWith TLThe period of conducting and Phase.
A kind of thyristor Soft Switching circuit control method of static var compensator, network voltage is sine wave, when When in positive half cycle, thyristor switchable capacitor TSC works in that forward direction cuts out mode and forward direction puts into operation mode；Their electric current road Diameter is respectively as follows: power grid → DC1→LsC1→LsC2→TC→DC4→ ground and power grid → AC capacitor C → ground；
When being in negative half period, thyristor switchable capacitor TSC work cuts out mode and the mode that reversely puts into operation with reversed, point Their current path is not respectively as follows: ground → DC2→LsC1→LsC2→TC→DC3→ power grid and ground → AC capacitor C → power grid.
A kind of thyristor Soft Switching circuit control method of static var compensator, capacitor switching moment, brilliant lock Pipe opens preceding CSCIn full state of charge, voltage swing is equivalent to alternating voltage amplitude, TCAnode-cathode voltage be positive Partially；When thyristor is opened, TCOn the electric current that flows through from power grid and CSCElectric discharge constitutes the circuit X and Y, greatly opens electricity Stream makes thyristor rapidly enter saturation conduction state；Due to LSC2It is smaller, TCAnd CSCEnd voltage it is equal, and CSCAlso smaller, end Voltage rapidly drops to the value close to zero, it is thereby achieved that the low-power consumption of thyristor, fast conducting；
In the circuit X, work as CSCCathode upper end when being that positive voltage rises maximum, loop current falls to zero；It needs to turn off When thyristor, S is openedC, make capacitor CSCElectric discharge, electric current are quickly transferred to CSCOn, it is formed into a loop Z, while making thyristor TCIt bears Counter voltage turns it off acceleration；And CSCForward end voltage slowly rise, and T this momentCIt early has been turned off, i.e., switching loss is zero.
A kind of thyristor 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 thyristor turns off, the upper no current of L；When network voltage is located at positive half cycle, control TLMake TCR work in forward conduction mode, current path are as follows: power grid → DL1→LsL1→LsL2→TL→DL4→ ground；When power grid electricity When pressure is located at negative half period, T can controlLMake TCR work in reverse conduction mode, as shown in Fig. 5 (b), current path are as follows: ground → DL2 →LsL1→LsL2→TL→DL3→ power grid.
A kind of thyristor Soft Switching circuit control method of static var compensator, thyristor open preceding CSLIn full State of charge, voltage swing are equivalent to alternating voltage amplitude, TLAnode-cathode voltage be positively biased；When thyristor is opened, TLOn the electric current that flows through from power grid and CSLElectric discharge constitutes the circuit U and V, and greatly opening electric current rapidly enters thyristor Saturation conduction state；Due to LSL2It is smaller, TLAnd CSLEnd voltage it is equal, and CSLAlso smaller, end voltage rapidly drops to close In zero value, it is thereby achieved that the low-power consumption of thyristor, fast conducting；In the circuit V, work as CSLCathode voltage rise it is maximum When, loop current falls to zero；When needing cutoff thyristor, S is openedL, make capacitor CSLElectric discharge, electric current are quickly transferred to CSLOn, It is formed into a loop W, while making thyristor TLCounter voltage is born, acceleration is turned it off；And CSLForward end voltage slowly rise, and this Carve TLIt early has been turned off, i.e., switching loss is zero.
A kind of thyristor Soft Switching circuit control method of static var compensator, for the thyristor of TSC and TCR TCWith TLControl, with electric network voltage phase be reference, according to the size of target control amount, determine triggering TCWith TLConducting Period and phase, specific steps are as follows: control circuit will first detect electric network voltage phase, and detection reactive power simultaneously calculates target control Amount processed, then target control amount is converted into control waveform by signal generator, most the door of thyristor is controlled through driving circuit afterwards It is extremely open-minded.
The present invention a kind of the thyristor Soft Switching circuit and control method of static var compensator, the specific table of advantage It is now following three aspects:
(1) in TSC or TCR, thyristor soft switch circuit only includes one group of single-phase bridge diode rectification unit, two Low reactance, a capacitor and a thyristor, are compared with the traditional method, although increasing bridge diode rectification unit, subtract Lack a thyristor, can actually substantially reduce cost.
(2) by the above principle Analysis, thyristor is in opening process, and the speed into saturation conduction is exceedingly fast, energy Enough substantially reduce turn-on consumption；In turn off process, zero-current switching may be implemented, turn-off power loss can almost be reduced to zero；Cause This, which has good Sofe Switch effect, and switching loss is very low.
(3) thyristor in circuit be made of two small inductors and a small capacitances ' T ' type buffer circuit is connected, right Good buffering effect is played in voltage and current impact, is beneficial to prevent overvoltage or overcurrent phenomenon occurs.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples:
Fig. 1 is control block diagram of the invention.
Fig. 2 (a) is the structure chart of thyristor switchable capacitor TSC of the invention.
Fig. 2 (b) is the structure chart of thyristor-controlled reactor TCR of the invention.
Fig. 3 (a) is that operating mode-forward direction of thyristor switchable capacitor cuts out ideograph.
Fig. 3 (b) is that operating mode-forward direction of thyristor switchable capacitor puts into operation ideograph.
Fig. 3 (c) is that the operating mode-of thyristor switchable capacitor reversely cuts out ideograph.
Fig. 3 (d) is that the operating mode-of thyristor switchable capacitor reversely puts into operation ideograph.
Fig. 4 (a) is that TSC thyristor opens the current loop figure with shutdown moment (thyristor is open-minded).
Fig. 4 (b) is that TSC thyristor is opened and the current loop figure of shutdown moment (thyristor shutdown).
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 that TCR thyristor is opened and the current loop of shutdown moment (thyristor is open-minded).
Fig. 6 (b) is that TCR thyristor is opened and the current loop of shutdown moment (thyristor closing).
Specific embodiment
A kind of thyristor Soft Switching circuit of static var compensator, including power grid 1., thyristor-controlled reactor TCR, thyristor switchable capacitor TSC, control circuit are 2.；1. the power grid includes high voltage bus L0, step-down transformer T, decompression One end that the secondary side of transformer T directly exchanges side with the in thyristor-controlled reactor TCR second uncontrollable rectifier bridge 2 is connect, This connecting node connects one end of AC capacitor C in thyristor switchable capacitor TSC, the first uncontrollable rectifier bridge 1 simultaneously The uncontrollable rectifier bridge 1 in one end, i.e. AC capacitor C and first, the 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 exchange side 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 includes the first uncontrollable rectifier bridge 1, thyristor TC, small inductor LsC1And LsC2, DC capacitor CsC, Power MOSFET SC, small inductor LsC1And LsC2Series connection, and the node of the two meets DC capacitor CsCOne end, DC capacitor The other end and Power MOSFET SCDrain electrode be connected；Constitute ' T ' type structure, small inductor LsC1Another termination first it is uncontrollable The anode of rectifier bridge 1, small inductor LsC2Another termination thyristor TCAnode, thyristor cathode and SCSource electrode together with first not The cathode of controllable rectifier bridge 1 is connected；
Thyristor-controlled reactor TCR includes thyristor control circuit, reactor L, thyristor control circuit by second not Controllable rectifier bridge 2, thyristor TL, small inductor LsL1And LsL2, DC capacitor CsL, Power MOSFET SLComposition；Second is uncontrollable Another exchange end of rectifier bridge 2 is connected with the one end reactor L, 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 Power MOSFET SLDrain electrode be connected, structure At ' T ' type structure, small inductor LsL1The uncontrollable rectifier bridge 2 of another termination second anode, small inductor LsL2Another termination it is brilliant Brake tube TLAnode, thyristor TLCathode and Power MOSFET SLThe source electrode cathode phase with the second uncontrollable rectifier bridge 2 together 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#, driving circuit 1~4；Phase detecting module input terminal is mains voltage signal ugrid, phase-detection Module output end 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 first signal generator 1# and the first signal generator 2# are θ, α1With α2, export and control signal Gate1~Gate4 for semiconductor switch gate pole；The input quantity of driving 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 network voltage u by Hall voltage sensorgrid, and use common software phase-lock loop Method obtains the phase of voltage, the phase as idle Detection & Controling amount computing module, signal generator 1# and signal generator 1# Position reference.
Idle Detection & Controling amount computing module: the module is with network voltage ugrid, electric current igridIt is input quantity with phase theta, It by calculating the power factor of power grid, and is compared with reference value 1, error uses ratio product as initial control amount Point control method calculates target control amount, exports control parameter α1And α2, respectively as signal generator 1# and signal generator The input signal of 1#.
Working principle:
SVC thyristor soft switch circuit proposed by the present invention includes two parts TSC and TCR, as shown in Figure 1, TSC and crystalline substance Brake tube switching circuit in parallel (or series connection), TCR connect (or series connection) with thyristor control circuit.Below by selective analysis Fig. 1 institute The circuit shown, the specific structure of TSC and TCR circuit such as Fig. 2 (a) and (b) are shown, and working principle is described below respectively:
(1) as shown in Fig. 2 (a), dotted line frame is the specific structure of uncontrollable rectifier bridge 1 shown in Fig. 1, it includes DC1~ DC4Totally four Power Diode Pumpeds, and DC1And DC3A bridge arm in series, DC2And DC4B bridge arm in series；The midpoint of a bridge arm with One end of capacitor C is connected, and the other end is connected with the midpoint of b bridge arm；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 TCCathode be connected； Ac capacitor CsCOne termination LsC1And LsC2Tie point, the other end and SCDrain electrode be connected, SCSource electrode and TCCathode be connected.
(2) network voltage is sine wave, and when being in positive half cycle, TSC is operable with that forward direction cuts out mode and forward direction puts into operation Mode, respectively as shown in Fig. 3 (a) and (b), their current path is respectively as follows: power grid → DC1→LsC1→LsC2→TC→DC4→ Ground and power grid → C → ground；When being in negative half period, TSC can work and reversely cut out mode and the mode that reversely puts into operation, respectively as schemed 3 (c) with shown in (d), their current path is respectively as follows: ground → DC2→LsC1→LsC2→TC→DC3→ power grid and ground → C → electricity Net.
(3) capacitor switching moment, the current loop of thuristor throw-in and throw-off circuit is as shown in figure 4, thyristor opens preceding CSCPlace In full state of charge, voltage swing is equivalent to alternating voltage amplitude, TCAnode-cathode voltage be positively biased；When thyristor is opened When logical, such as Fig. 4 (a), TCOn the electric current that flows through from power grid and CSCElectric discharge constitutes the circuit X and Y, and greatly opening electric current makes Thyristor rapidly enters saturation conduction state；Due to LSC2It is smaller, TCAnd CSCEnd voltage it is equal, and CSCAlso smaller, end voltage The value close to zero is rapidly dropped to, it is thereby achieved that the low-power consumption of thyristor, fast conducting；In the circuit X, work as CSCIt is negative When pole (upper end is positive) voltage rises maximum, loop current falls to zero；When needing cutoff thyristor, such as Fig. 4 (b), S is openedC, Make capacitor CSCElectric discharge, electric current are quickly transferred to CSCOn, it is formed into a loop Z, while making thyristor TCCounter voltage is born, turns it off and adds Speed；And CSCForward end voltage slowly rise, and T this momentCIt early has been turned off, i.e., switching loss is zero；As it can be seen that thyristor open and Voltage or voltge surge is not present in turn off process, and loss is extremely low, that is, realizes 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 specific structure of controllable rectifier bridge 2, it includes DL1~DL4Totally four Power Diode Pumpeds, and DL1And DL3C bridge arm in series, DL2 And DL4D bridge arm in series；The midpoint of c bridge arm is connected with power grid, and the midpoint of d bridge arm is connected with one end of reactor L, and L is another End ground connection；DL1And DL2Common cathode, DL3And DL4Common-anode；Above-mentioned common cathode polar contact and LsL1One end be connected, LsL1And LsL2Series connection Deutomerite TLAnode, above-mentioned common-anode node is directly and TLCathode be connected；Ac capacitor CsLOne termination LsL1And LsL2Connection Point, the other end and SLDrain electrode be connected, SLSource electrode and TLCathode be connected.
(5) as shown in figure 5, being two kinds of conduction modes of TCR, i.e. forward conduction mode and reverse conduction mode, thyristor When shutdown, the upper no current of L；When network voltage is located at positive half cycle, T can controlLMake TCR work in forward conduction mode, such as Fig. 5 (a) shown in, current path are as follows: power grid → DL1→LsL1→LsL2→TL→DL4→ ground；When network voltage is located at negative half period, controllably T processedLMake TCR work in reverse conduction mode, as shown in Fig. 5 (b), current path are as follows: ground → DL2→LsL1→LsL2→TL→DL3 → power grid.
(6) current loop of thyristor control circuit is as shown in fig. 6, thyristor opens preceding CSLIn full state of charge, Voltage swing is equivalent to alternating voltage amplitude, TLAnode-cathode voltage be positively biased；When thyristor is opened, such as Fig. 6 (a), TL On the electric current that flows through from power grid and CSLElectric discharge constitutes the circuit U and V, and greatly opening electric current, to rapidly enter thyristor full And on state；Due to LSL2It is smaller, TLAnd CSLEnd voltage it is equal, and CSLAlso smaller, end voltage rapidly drop to close to Zero value, it is thereby achieved that the low-power consumption of thyristor, fast conducting；In the circuit V, work as CSLCathode (upper end is positive) voltage When rising maximum, loop current falls to zero；When needing cutoff thyristor, such as Fig. 6 (b), S is openedL, make capacitor CSLElectric discharge, electricity Stream is quickly transferred to CSLOn, it is formed into a loop W, while making thyristor TLCounter voltage is born, acceleration is turned it off；And CSLForward end Voltage slowly rises, and T this momentLIt early has been turned off, i.e., switching loss is zero；It is not present as it can be seen that thyristor turns on and off process Voltage or voltge surge, and loss is extremely low, that is, realizes Soft Switching.
(7) in above-mentioned SVC circuit, for the thyristor T of TSC and TCRCWith TLControl, be with electric network voltage phase With reference to, it be according to the size of target control amount, determining triggering TCWith TLThe period of conducting and phase, specific steps are as follows: control circuit Electric network voltage phase is first detected, reactive power is detected and calculates target control amount, then target control amount is occurred by signal Device is converted to control waveform, most afterwards through driving circuit, the gate pole for controlling thyristor is open-minded, and substantially frame structure is as shown in figure 1 Control circuit unit.

Claims (4)

1. a kind of thyristor Soft Switching circuit of static var compensator, including power grid (1.), thyristor-controlled reactor TCR, thyristor switchable capacitor TSC, control circuit (2.)；It is characterized by:
The power grid (1.) includes high voltage bus L0, step-down transformer T, the secondary side of step-down transformer T directly with thyristor control One end connection of second uncontrollable rectifier bridge (2) exchange side, this connecting node connect thuristor throw-in and throw-off simultaneously in reactor TCR processed One end of AC capacitor C in capacitor TSC, the first uncontrollable rectifier bridge (1) one end, 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 directly in parallel with AC capacitor C, the other end ground connection of the two；
Thuristor throw-in and throw-off circuit includes the first uncontrollable rectifier bridge (1), thyristor TC, small inductor LsC1And LsC2, DC capacitor CsC、 Power MOSFET SC, small inductor LsC1And LsC2Series connection, and the node of the two meets DC capacitor CsCOne end, DC capacitor CsC's The other end and Power MOSFET SCDrain electrode be connected；Small inductor LsC1One end connect DC capacitor CsCOne end, small inductor LsC1The first uncontrollable rectifier bridge of another termination (1) anode, small inductor LsC2One end connect DC capacitor CsCOne end, it is small Inductance LsC2Another termination thyristor TCAnode, thyristor TCCathode and Power MOSFET SCSource electrode together can not with first The cathode for controlling rectifier bridge (1) is connected；
Thyristor-controlled reactor TCR includes thyristor control circuit, reactor L, and thyristor control circuit is uncontrollable by second Rectifier bridge (2), thyristor TL, small inductor LsL1And LsL2, DC capacitor CsL, Power MOSFET SLComposition；Second is uncontrollable whole Stream bridge (2) one exchange end connect with the secondary side of step-down transformer T, another exchange end of the second uncontrollable rectifier bridge (2) and The one end reactor L is connected, the other end ground connection of reactor L；Small inductor LsL1And LsL2Series connection, and the node of the two connects DC capacitor CsLOne end, DC capacitor CsLThe other end and Power MOSFET SLDrain electrode be connected, small inductor LsL1One end connect direct current Hold CsLOne end, small inductor LsL1The second uncontrollable rectifier bridge of another termination (2) anode, small inductor LsL2One end connection it is straight Galvanic electricity holds CsLOne end, small inductor LsL2Another termination thyristor TLAnode, thyristor TLCathode and Power MOSFET SL Source electrode is connected with the cathode of the second uncontrollable rectifier bridge (2) together；
Control circuit (2.) includes phase detecting module, idle Detection & Controling amount computing module, the first signal generator (1#) With second signal generator (2#), driving circuit 1~4；Phase detecting module input terminal is mains voltage signal ugrid, phase inspection Survey module output end is voltage-phase θ；The input that idle Detection & Controling amount computing module calculates is voltage-phase θ and power grid electricity Flow signal Igrid, output is respectively controlling angled a1And α2；The input quantity of first signal generator (1#) is controlling angled a1With voltage phase Position θ, the input quantity of second signal generator (2#) are controlling angled a2With voltage-phase θ；Output is that semiconductor switch gate pole controls Signal Gate1~Gate4；The input quantity of driving circuit 1~4 is respectively Gate1~Gate4, exports thyristor T respectivelyC, brilliant lock Pipe TL, Power MOSFET SCWith Power MOSFET SLGate pole control signal Gate1, Gate2, Gate SCWith Gate SL； For the thyristor T of thyristor switchable capacitor TSC and thyristor-controlled reactor TCRCWith thyristor TLControl, with electricity Net voltage-phase is reference, to determine triggering T according to the size of target control amountCWith TLThe period of conducting and phase.
2. the thyristor Soft Switching circuit of a kind of static var compensator according to claim 1, it is characterised in that: institute Stating the first uncontrollable rectifier bridge (1) includes DC1~DC4Totally four Power Diode Pumpeds, and DC1And DC3A bridge arm in series, DC2With DC4B bridge arm in series；The midpoint of a bridge arm is connected with one end of AC capacitor C, and the other end is connected with the midpoint of b bridge arm； DC1And DC2Common cathode, DC3And DC4Common-anode；Above-mentioned common cathode polar contact and LsC1One end be connected, LsC1And LsC2Series connection is followed by TC's Anode, above-mentioned common-anode node is directly and TCCathode be connected；DC capacitor CsCOne termination small inductor LsC1With small inductor LsC2's Tie point, the other end and Power MOSFET SCDrain electrode be connected, Power MOSFET SCSource electrode and thyristor TCCathode phase Even.
3. the thyristor Soft Switching circuit of a kind of static var compensator according to claim 1, it is characterised in that: institute Stating the second uncontrollable rectifier bridge (2) includes DL1~DL4Totally four Power Diode Pumpeds, and Power Diode Pumped DL1With Power Diode Pumped DL3 C bridge arm in series, Power Diode Pumped DL2With Power Diode Pumped DL4D bridge arm in series；The midpoint of c bridge arm is connected with power grid, The midpoint of d bridge arm is connected with one end of reactor L, reactor L other end ground connection；Power Diode Pumped DL1With Power Diode Pumped DL2 Common cathode, Power Diode Pumped DL3With Power Diode Pumped DL4Common-anode；Above-mentioned common cathode polar contact and small inductor LsL1One end be connected, Small inductor LsL1With small inductor LsL2Series connection is followed by thyristor TLAnode, above-mentioned common-anode node directly with thyristor TLCathode It is connected；DC capacitor CsLOne termination small inductor LsL1With small inductor LsL2Tie point, the other end and Power MOSFET SLLeakage Extremely it is connected, Power MOSFET SLSource electrode and thyristor TLCathode be connected；For the thyristor T of TSC and TCRCWith thyristor TLControl, with electric network voltage phase be reference, according to the size of target control amount, determine triggering thyristor TCWith brilliant lock Pipe TLThe period of conducting and phase.
4. using the crystalline substance of the thyristor 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 thyristor of thyristor switchable capacitor TSC and thyristor-controlled reactor TCR TCWith thyristor TLControl, be reference with electric network voltage phase, to determine according to the size of target control amount and trigger brilliant lock Pipe TCWith thyristor TLThe period of conducting and phase, specific steps are as follows: control circuit will first detect electric network voltage phase, detect nothing Function power simultaneously calculates target control amount, then target control amount is converted to control waveform by signal generator, most afterwards through driving Circuit, the gate pole for controlling thyristor are open-minded.
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CN104538966A (en) * 2015-01-22 2015-04-22 中国矿业大学 Hybrid compensation system for negative-sequence current in high speed railway

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