CN104979796B - A kind of precharge type high speed d-c circuit breaker and its control method - Google Patents

A kind of precharge type high speed d-c circuit breaker and its control method Download PDF

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Publication number
CN104979796B
CN104979796B CN201510315028.9A CN201510315028A CN104979796B CN 104979796 B CN104979796 B CN 104979796B CN 201510315028 A CN201510315028 A CN 201510315028A CN 104979796 B CN104979796 B CN 104979796B
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CN
China
Prior art keywords
branch
electronic switch
capacitance
main electronic
circuit breaker
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CN201510315028.9A
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Chinese (zh)
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CN104979796A (en
Inventor
吴金龙
张军
王先为
何青连
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许继集团有限公司
许继电气股份有限公司
西安许继电力电子技术有限公司
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Priority to CN201510315028.9A priority Critical patent/CN104979796B/en
Publication of CN104979796A publication Critical patent/CN104979796A/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/087Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/20Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage

Abstract

The present invention relates to a kind of precharge type high speed d-c circuit breaker and its control method, including cutout branch in parallel and main electronic switch branch, main electronic switch branch be used to circulate normal operation when electric current;The cutout branch includes the cut-off switch and capacitance of series connection, and capacitance both ends are used to connect charge power supply;The main electronic switch branch includes at least one electronic switch unit, multiple electronic switch unit series connection, and electronic switch unit is made of high-power switch device.Cut-off switch and main electronic switch branch are solid-state switch, can avoid the problem that the use due to mechanical switch in the prior art.Breaker topological structure of the present invention and control process are simple, are easy to implement in Practical Project.

Description

A kind of precharge type high speed d-c circuit breaker and its control method

Technical field

The present invention relates to a kind of precharge type high speed d-c circuit breaker and its control method.

Background technology

In recent years, with the continuous development of China's economy and science and technology, the demand of the energy is also increasingly increased.Effectively to solve The energy skewness problem in China, HVDC Transmission Technology currently become a kind of effective means.Especially flexible direct current The gradual ripe distributed new that even more promotes of technology of transmission of electricity develops.Since forthright system is fireballing with fault progression Characteristic, especially for the flexible direct current power transmission system based on IGBT device, due to there are anti-paralleled diode, when DC side is sent out , can not quick limiting short-circuit current during raw failure.Therefore the research of dc circuit breaker has for the stability of DC transmission system Important meaning.

At present, high voltage DC breaker mainly has mechanical dc circuit breaker, solid-state direct-current breaker and hybrid direct current Breaker.Mechanical dc circuit breaker is that increase can cut-off direct current on conventional mechanical formula AC circuit breaker architecture basics The vibration converter circuit of high frequency oscillating current zero crossing is automatically formed in current course, have it is stable, load capacity is strong, logical The advantages that state loss is small, but its contact is easily cut-off electric arc damage, and connecting-disconnecting function is limited, and the fault current mute time is longer.

Hybrid high voltage DC breaker combines mechanical dc circuit breaker and solid-state direct-current breaker, combines them The advantages of, have the advantages that on-state loss is small, it is quick controllable to cut-off, without arc, silent, without special cooling device.Mixing Formula high voltage DC breaker generally shunts mechanical switch using electronic power switch, using the electric discharge of capacitor-clamped capacitance Can not accurately it control.Such as Chinese patent literature《Hybrid dc circuit breaker》(103021739 A of CN), one kind of proposition is mixed Box-like dc circuit breaker, the program are made of high-speed vacuum switch, LC forced branches circuit and overvoltage limiting circuit in parallel, LC forced branches circuit includes the LC and power electronics gate electrode capable of switching off device of series connection.

Under normal condition, electric current is flowed through from high-speed vacuum switch, and the pre- capacitance C in LC forced branch circuits is filled with certain Voltage, power electronics gate electrode capable of switching off device is off state, when the system failure, it is necessary to when breaker disconnects, control electricity Power electronics gate electrode capable of switching off device is opened, the pre- capacitance in LC forced branch circuits by power electronics gate electrode capable of switching off device, Inductance L and high-speed vacuum switch forming circuit electric discharge, are finally reached direct current shut-off purpose.

Then, mixed type dc circuit breaker for mechanical switch opening velocity require it is very harsh, generally will 3ms with Interior completion cut-offs and recovers the blocking characteristics that insulate, and quickly high-pressure machinery switch research and development difficulty this at present is very big, thus pole The big engineer application for limiting the program.

The content of the invention

The object of the present invention is to provide a kind of dc circuit breaker, to solve mixed type dc circuit breaker in the prior art Defect.

To achieve the above object, the solution of the present invention includes:

A kind of precharge type high speed d-c circuit breaker, including cutout branch in parallel and main electronic switch branch, main electronics Switching branches be used for circulate normal operation when electric current;The cutout branch includes the cut-off switch and capacitance of series connection, capacitance two End is used to connect charge power supply;The main electronic switch branch includes at least one electronic switch unit, multiple electronic switch lists Member series connection, electronic switch unit are made of high-power switch device.

Current-limiting inductance is additionally provided with the cutout branch, current-limiting inductance is connected with the capacitance.

The cut-off switch is made of the thyristor of at least a pair of of reverse parallel connection, the Thyristors in series of multipair reverse parallel connection.

The electronic switch unit is the thyristor of a pair of of reverse parallel connection.

The precharge type high speed d-c circuit breaker further includes at least one arrester, arrester and the cutout branch and The correspondence branch or element in parallel of main electronic switch branch.

Present invention also offers a kind of control method of precharge type high speed d-c circuit breaker, under normal condition, control is filled Power supply charges for capacitance;When needing the breaker to disconnect, the charge circuit of capacitance is turned off first, then triggering and conducting cutout branch Road so that main electronic switch branch turns off after being zero in electric current after a period of time.

Cut-off switch and main electronic switch branch are solid-state switch, can be avoided due to mechanical switch in the prior art Use the problem of.Breaker topological structure of the present invention and control process are simple, are easy to implement in Practical Project.

Using capacitance preliminary filling electrically, the backward voltage needed for shut-off is provided for thyristor in main electronic switch.Precharge Operated in the disconnection process of circuit for no current, it can be achieved that charge circuit is quickly cut off;The turn-off time of main electronic switch is very small, It ensure that the turn-off time of breaker;Using thyristor as main electronic switch, it is lost in dc circuit breaker normal course of operation It is very small;The charge circuit of the formation such as capacitance, can reduce the fault current in breaker rapidly in cutout branch.In turn off process Overvoltage is formed on-board the circuit breaker, since the protective effect breaker both end voltage of arrester is limited in the complete complete of insulating requirements Scope, while energy is released by arrester in breaker turn off process.

Brief description of the drawings

Fig. 1 is the direct-current breaker topology structure of embodiment 1;

Fig. 2 is the control logic in dc circuit breaker turn off process;

The working status of dc circuit breaker when Fig. 3 is up;

Fig. 4 is dc circuit breaker commutation course;

Fig. 5 is the working status of breaker in main electronic switch branch turn off process;

Fig. 6 is the current waveform of main electronic switch branch in disconnection process;

Fig. 7 is the current waveform of cutout branch in disconnection process.

Embodiment

Dc circuit breaker embodiment

The all solid state high speed d-c circuit breaker of precharge type as shown in Figure 1, including cutout branch in parallel, main electronic switch Branch and arrester branch.Main electronic switch branch be used for circulate normal operation when electric current;The branch that stops includes the disconnected of series connection Stream switch C, capacitance and current-limiting inductance L, capacitance both ends connect charge power supply Uc by charge switch;Main electronic switch branch includes At least one electronic switch unit, multiple electronic switch unit series connection, electronic switch unit are made of high-power switch device.Keep away Thunder device is with stating cutout branch, main electronic switch branch circuit parallel connection.

In the present embodiment without mechanical switch, all using solid-state switch, the power electronic devices in solid-state switch is complete Portion uses thyristor.That is, the minimum unit of cut-off switch, and the minimum unit of main electronic switch is all a pair of of reverse parallel connection Thyristor.Thyristor belongs to half control type device, and only triggering and conducting process is controllable, but turn off process can only rely on circuit Characteristic.

Control method is:During normal condition, charge power supply is controlled to charge for capacitance;When needing the breaker to disconnect, close first The charge circuit held is powered off, then triggering and conducting cutout branch so that main electronic switch branch is zero in electric current after a period of time After turn off.

From the point of view of attached drawing, in the dc circuit breaker control logic of the present embodiment, only two operating procedures:Excision cutout The preliminary filling electrical circuit of capacitance;Triggering and conducting cut-off switch.During normal operation, main electronic switch is in the conduction state, in circuit DC current is flowed through from the main electronic switch branch of breaker.Stop in branch, cut-off switch is off state, and capacitance leads to Preliminary filling electrical circuit is crossed to charge.

After failure occurs, that is, t0At the moment, turn off the pre-charge circuit of short circuit capacitance, capacitance is charged complete at this time first Into, then triggering and conducting cut-off switch, certain time delay is reserved in the action process of two groups of switches, such as the t in Fig. 20~t1

After cut-off switch triggering, cutout capacitance, the composition discharge loop such as current limiter, on electric current in the branch that stops is gradual Rise, the voltage reversal at main electronic switch branch both ends, the electric current in main electronic switch is quickly fallen to after zero, it is necessary to be again brilliant lock Pipe reserves enough turn-off times (blow-out angle), and all thyristors are off state in main electronic switch.It is as shown in Figure 2 T1~t2

After electric current drops to zero in main electronic switch, fault current is all flowed through from cutout branch, and passes through current limliting Device etc. forms capacitance reverse charging circuit, and electric current is gradually reduced, and after the electric current in the branch that stops is reduced to zero, breaker is completed Disconnection task.

The working status of all solid state high speed d-c circuit breaker of precharge type when Fig. 3 show normal operation.

During normal operation, cutout branch interruption galvanic electricity appearance preliminary filling electrical circuit is in the conduction state, thyristor in cut-off switch State is off, does not have electric current to flow through in the branch that stops.

During normal operation, main all thyristors of electronic switch branch are all in conducting state, and the DC current of circuit is from master Electronic switch branch flows through.

Fig. 4 show the main electronic switch branch turn off process of all solid state high speed d-c circuit breaker of precharge type.

When DC circuit breaks down, it is necessary to when breaker disconnects, shut-off cutout branch interrupts the preliminary filling that galvanic electricity is held first Electrical circuit, at this time capacitance be previously-completed charging, then whole thyristors in triggering and conducting cut-off switch.

After cut-off switch triggering and conducting, cutout capacitance, current limiter, cut-off switch etc. form discharge loop, in the branch that stops Electric current Id1Start to increase.

After cut-off switch triggering and conducting, the voltage U at thyristor both endsT2<0, i.e., thyristor both ends are backward voltages at this time, main Electric current I on electronic switch branchd2Begin to quickly decrease to zero;In Id2After being reduced to zero, then in main electronic switch branch After thyristor reserves enough turn-off times (blow-out angle), main electronic switch branch shut-off.

It is all solid state working state of circuit breaker of precharge type in cutout branch turn off process shown in Fig. 5.

After shut-off, fault current all flows through cutout branch to main electronic switch branch.At this time stop capacitance, current limiter, Cut-off switch etc. forms charge circuit.Fault current carries out reverse charging by charge circuit to capacitance, the electricity in the branch that stops Flow Id1It is gradually reduced, after the electric current in the branch that stops is reduced to zero, breaker is completed to disconnect the task of DC circuit.

In main electronic switch branch turns off and stop branch turn off process, overvoltage, breaker are formed on-board the circuit breaker Middle arrester electric current rises, by energy absorption.

Fig. 6,7 show patent of the present invention and propose that all solid state High-speed DC speed breaker of precharge type is main in disconnection process Current waveform figure in electronic switch branch and cutout branch.

Breaker starts to act at the 1ms moment, cutout capacitance preliminary filling electrical circuit excision, and capacitance pre-charge process has been at this time Complete.All thyristors in the 2ms moment, triggering and conducting cut-off switch, capacitance, current limiter, cut-off switch form discharge loop. Main electronic switch branch both ends form backward voltage, and the electric current in main electronic switch branch starts to reduce, the electricity in the branch that stops Stream starts to increase.Electric current is reduced to zero in 2.05ms moment electric currents in main electronic switch branch, and fault current is all from cutout branch Flow through.Capacitance discharge process and do not complete at this time, main electronic switch both ends are still in backward voltage state.Stop capacitance, current limliting Device, cut-off switch form capacitance charge circuit, and fault current carries out reverse charging by the circuit to capacitance, the voltage on capacitance Start rapid reduction, then start reversely to increase.With the change of cutout capacitance voltage, voltage on main electronic switch branch by Gradually from reversely becoming positive, thyristor completes the recovery of forward blocking ability before voltage becomes forward direction.Capacitance reverse charging Afterwards, the electric current to stop on branch starts to be gradually reduced.Before the 5.5ms moment, the electric current in breaker falls to zero, and direct current breaks Road device completes shut-off.The breaker whole work process duration is less than 5ms.

Patent of the present invention proposes all solid state high direct current speed breaker of precharge type in disconnection process, only preliminary filling electrical circuit Disconnect and two rate-determining steps of cut-off switch triggering and conducting.Capacitance etc. forms discharge loop, main electricity after cut-off switch triggering and conducting Sub switch both ends form backward voltage, and the electric current on main electronic switch branch quickly falls to zero.After main electronic switch shut-off, therefore Barrier electric current all flows through cutout branch and carries out reverse charging to capacitance by current limiter etc..Electric current in cutout branch starts fast Speed drops to zero, and breaker is completed to disconnect.It is no in breaker to use mechanical switch, it is complete by the control to power electronic devices Into the transfer and shut-off of electric current, the actuation time of breaker ensure that.Power electronic devices in solid-state switch and commutation switch Number is few, significantly reduces the running loss of breaker and has good economy.

Solid-state switch uses thyristor in the present embodiment, as other embodiment, can also use half control type electricity One or more of combinations in power electronic device or all-controlling power electronics device, for example, IGBT, GTO etc..It should be noted that It is that, according to wholly-controled device, the control process of control method has respective change.

, can be as the case may be selectively in cutout branch, main electronic switch branch as other embodiment Counter element on add arrester.

Control method embodiment

Control method in the present embodiment is identical with the control method in above example, and details are not described herein.

Specific embodiment is presented above, but the present invention is not limited to described embodiment.The base of the present invention This thinking is above-mentioned basic scheme, and for those of ordinary skill in the art, teaching, designs various changes according to the present invention The model of shape, formula, parameter simultaneously need not spend creative work.It is right without departing from the principles and spirit of the present invention The change, modification, replacement and modification that embodiment carries out are still fallen within protection scope of the present invention.

Claims (6)

1. a kind of precharge type high speed d-c circuit breaker, it is characterised in that including cutout branch in parallel and main electronic switch branch Road, main electronic switch branch be used for circulate normal operation when electric current;
The cutout branch includes the cut-off switch and capacitance of series connection, and capacitance both ends are used to connect charge power supply;
The main electronic switch branch includes at least one electronic switch unit, and electronic switch unit is by high-power switch device structure Into, when the main electronic switch branch includes multiple electronic switch units, multiple electronic switch unit series connection;
Under normal condition, charge power supply is controlled to charge for capacitance;When needing the breaker to disconnect, the charging for turning off capacitance first is returned Road, then triggering and conducting cutout branch, capacitance starts to discharge, and main electronic switch branch both ends form backward voltage, main electronic cutting The electric current closed in branch starts to reduce so that main electronic switch branch turns off after being zero in electric current after a period of time.
2. precharge type high speed d-c circuit breaker according to claim 1, it is characterised in that also set in the cutout branch Current limiting inductance, current-limiting inductance are connected with the capacitance.
3. precharge type high speed d-c circuit breaker according to claim 2, it is characterised in that the cut-off switch is by least The thyristor of a pair of of reverse parallel connection is formed, the Thyristors in series of multipair reverse parallel connection.
4. precharge type high speed d-c circuit breaker according to claim 3, it is characterised in that the electronic switch unit is The thyristor of a pair of of reverse parallel connection.
5. the precharge type high speed d-c circuit breaker according to claim 1 or 2 or 3 or 4, it is characterised in that the preliminary filling Electric type high speed d-c circuit breaker further includes at least one arrester, arrester and the cutout branch and main electronic switch branch Corresponding branch or element in parallel.
6. the control method for precharge type high speed d-c circuit breaker described in claim 1, it is characterised in that normal condition Under, control charge power supply to charge for capacitance;When needing the breaker to disconnect, the charge circuit of capacitance is turned off first, and then triggering is led Break-make stream branch so that main electronic switch branch turns off after being zero in electric current after a period of time.
CN201510315028.9A 2015-06-10 2015-06-10 A kind of precharge type high speed d-c circuit breaker and its control method CN104979796B (en)

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CN201510315028.9A CN104979796B (en) 2015-06-10 2015-06-10 A kind of precharge type high speed d-c circuit breaker and its control method
PCT/CN2016/085449 WO2016197973A1 (en) 2015-06-10 2016-06-12 Pre-charged high-speed direct-current breaker and control method therefor, and storage medium

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CN104979796B (en) * 2015-06-10 2018-05-04 许继集团有限公司 A kind of precharge type high speed d-c circuit breaker and its control method
CN105720552B (en) * 2016-01-25 2019-05-31 华北电力大学 A kind of current-limiting type high voltage DC breaker
CN106209039A (en) * 2016-08-18 2016-12-07 平高集团有限公司 A kind of novel mixed type dc circuit breaker and power cell
CN109412130A (en) * 2017-08-15 2019-03-01 平高集团有限公司 A kind of mechanical dc circuit breaker and its charge circuit
CN107863759A (en) * 2017-10-13 2018-03-30 浙江大学 It is a kind of that capacitor type dc circuit breaker and its DC Line Fault processing strategy are sealed in based on mechanical switch
CN107786188B (en) * 2017-10-25 2020-09-08 清华大学 LC oscillation based forced current exchange type combined switch
CN107947132B (en) * 2017-11-30 2019-03-19 天津大学 A kind of micro- loss combined machine formula dc circuit breaker with reclosing function

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