CN104113057B - A kind of combined DC switchgear and control method thereof - Google Patents
A kind of combined DC switchgear and control method thereof Download PDFInfo
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- CN104113057B CN104113057B CN201410310512.8A CN201410310512A CN104113057B CN 104113057 B CN104113057 B CN 104113057B CN 201410310512 A CN201410310512 A CN 201410310512A CN 104113057 B CN104113057 B CN 104113057B
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Abstract
The invention discloses a kind of combined DC switchgear, switch including DC load, controller, some series arms, and for gathering the Acquisition Circuit of the electric current through described combined DC switchgear, each series arm all includes fuse and isolation switch, in each series arm, the outfan of fuse is connected with one end of isolation switch, input interface is connected with the input of fuse in each series arm, in each series arm, the other end of isolation switch is all connected with one end of DC load switch, the other end of DC load switch is connected with output interface, the outfan of Acquisition Circuit is connected with the input of controller, the outfan of controller is connected with the control end controlling end and DC load switch of isolation switch in each series arm respectively, present invention also offers the control method of a kind of combined DC switch.This Apparatus and method for is capable of automatic reclosing operation during logical super-high-current, simultaneously simple in construction, easily operated, and cost is low.
Description
Technical field
The invention belongs to electric power application, be specifically related to a kind of combined DC switchgear and control method thereof.
Background technology
It is otherwise varied for the technology of high pressure and two fields employings of low pressure that existing direct current cut-offs mode.Low-voltage direct cut-offs main employing natural style and forced action type.HVDC cut-offs mode and mainly adopts: (1) utilizes the phase shift of changer, locking, it is achieved cut-off；(2) superposition exchange on direct current, produces current over-zero, it is achieved cut-off；(3) direct current is first carried out current limliting, then cut-off little DC current.
In dc circuit breaker, DC converter is that fixing DC voltage conversion becomes variable DC voltage, also referred to as DC chopped-wave, because it is retrained by existing power electronic devices capacity and Cost Problems, is not slowly used in high pressure field.
ChristianM.Franck refer to the basic configuration of high voltage DC breaker in its document and must is fulfilled for three requirements: create artificial zero point, absorption system inductance energy and voltage after bearing arc.The many employings of this dc circuit breaker are the method for superposition exchange on direct current, and basic configuration is chopper, capacitor and inductor and spark gap.Air-break or vacuum circuit breaker is used by changing the type such as breaker portion of device in configuration, can be obtained by many kinds of dc circuit breakers, and there are some schemes to have been carried out, but its highest applied voltage grade has been severely restricted, mainly considered that its switch off time is excessively slow.
Current limliting cutoff method is in occupation of increasingly heavier ratio in direct current cut-offs, and the patent of invention that the patent No. is 201310198976.X mentions a kind of dc circuit breaker including superconductive current limiter and hydrogen chopper, utilizes current limliting to cut-off and solves the problem that direct current cut-offs.But it is expensive to be because superconductor, and it is limited to bear current capacity, and it is all urgently to be resolved hurrily that it quenches recovery, heat radiation and maintenance issues, so cannot adopt on a large scale.
In addition, domestic and international research worker is all being devoted to research and development circuit breaker, but also suffers from imperfection part.The patent No. be 201310061175.9 patent of invention be referred to a kind of dc circuit breaker and its implementation, including the cutout loop being connected in parallel, commutation circuit and energy absorption loop, wherein cutout loop includes the cutout inductance and the interruption units that are connected in series, commutation circuit includes the change of current inductance, convertor unit and the mechanical switch that are connected in series, and convertor unit is compared interruption units and had less conducting resistance.Cutout loop is by adopting power semiconductor switch module to cut off electric current, and movement time is fast, and produces without electric arc.But cutout loop reaches anticipation connecting-disconnecting function by the mode of series power electronic device, and its thermal capacity and cost are all insoluble problems.Power electronic devices and mechanical switch the toggling of function in cutting off direct current process, it is desirable to control very fine, somewhat accidentally will make power electronic devices generation permanent damages in interrupting process, so the application of this dc circuit breaker is extremely difficult.
Summary of the invention
It is an object of the invention to the shortcoming overcoming above-mentioned prior art, provide a kind of combined DC switchgear and control method thereof, this equipment and control method thereof are capable of automatic reclosing operation during logical super-high-current, simultaneously simple in construction, easily operated, and cost is low.
For reaching above-mentioned purpose, combined DC switchgear of the present invention includes DC load switch, controller, some series arms, and for gathering the Acquisition Circuit of the electric current through described combined DC switchgear, each series arm all includes fuse and isolation switch, in each series arm, the outfan of fuse is connected with one end of isolation switch, input interface is connected with the input of fuse in each series arm, in each series arm, the other end of isolation switch is all connected with one end of DC load switch, the other end of DC load switch is connected with output interface, the outfan of Acquisition Circuit is connected with the input of controller, the outfan of controller is connected with the control end controlling end and DC load switch of isolation switch in each series arm respectively.
Described DC load switch includes vacuum switch, triggers switch and discharge capacity device, in each series arm, the other end of isolation switch is connected with the negative pole of one end of vacuum switch and discharge capacity device after being connected respectively, the positive pole of discharge capacity device is connected with the one end triggering switch, triggering after the other end switched is connected with the other end of vacuum switch and be connected with output interface, the outfan of controller is connected with the control end controlling end and vacuum switch triggering switch respectively.
The control method of combined DC of the present invention switch comprises the following steps:
In the course of the work, the pass that keeps apart that controller controls in the series arm of any one road closes, and this series arm is denoted as work branch, and other series arm is denoted as emergency bypass, and the isolation that controller controls on each emergency bypass simultaneously switches off；
When combined DC switchgear needs to carry out closing operation, controller produces switching signal, and described switching signal is forwarded to the control end that DC load switchs, and DC load switch carries out closing operation according to described switching signal；
When described combined DC switchgear needs to turn off operation, controller produces sub-gate signal, and described sub-gate signal is forwarded to the control end of DC load switch, DC load switch makes DC load switch off according to described sub-gate signal, extinguish direct-current arc, and bear the recovery voltage after arc, it is achieved the sub-switching operation of DC circuit；
When the electric current through described combined DC switchgear is more than pre-set threshold value, heat effect due to electric current, the fuse of fuse quick fuse voluntarily in work branch, restriction is through the growth of the electric current of described combined DC switchgear, and force described electric current to decline, after described electric current is restricted to default minimum current by the fuse in work branch, owing in work branch, fuse exists tail currents, controller drives DC load switch to open, simultaneously drive the switch of the isolation in work branch to open, and the pass that keeps apart controlled in the emergency bypass of any one road closes, this emergency bypass is made to turn on, then DC load switch is driven to close a floodgate again, complete automatically to change the purpose of fuse and reclosing.
The method have the advantages that
In combined DC switchgear of the present invention and the control method process that automatic reclosing operates when realizing logical super-high-current thereof, put into a road series arm, then using other series arms as emergency bypass, then this road series arm put into is denoted as work branch, when external circuit normal operation, combined floodgate and the disconnection of DC load switch is controlled by controller, when when the electric current of described combined DC switchgear is excessive, fuse blows in work branch, thus the electric current limited in this work branch, when described electric current is restricted to default minimum current, owing to the fuse in described work branch exists tail currents, controller drives DC load switch to open, simultaneously drive the switch of the isolation in work branch to open, and the pass that keeps apart controlled in the emergency bypass of any one road closes, this emergency bypass is made to turn on, then DC load switch is driven to close a floodgate again, thus automatic reclosing operation when realizing logical super-high-current, connecting-disconnecting function is strong, simple in construction, reliability is high, with low cost and the advantages such as automatic reclosing can be realized, the range of application of DC switch equipment can greatly be extended, promote the development of direct current power system.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the present invention；
Fig. 2 is the circuit diagram of DC load switch 1 in the present invention；
Fig. 3 is the circuit diagram of embodiment one in the present invention.
Wherein, 1 be DC load switch, 2 be fuse, 3 for isolation switch, 4 for vacuum switch, 5 for discharge capacity device, 6 for trigger switch.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail:
With reference to Fig. 1 and Fig. 2, combined DC switchgear of the present invention includes DC load switch 1, controller, some series arms, and for gathering the Acquisition Circuit of the electric current through described combined DC switchgear, each series arm all includes fuse 2 and isolation switch 3, in each series arm, the outfan of fuse 2 is connected with one end of isolation switch 3, input interface is connected with the input of fuse 2 in each series arm, one end that in each series arm, the other end of isolation switch 3 all switchs 1 with DC load is connected, the other end of DC load switch 1 is connected with output interface, the outfan of Acquisition Circuit is connected with the input of controller, the outfan of controller is connected with the control end controlling end and DC load switch 1 of isolation switch 3 in each series arm respectively, DC load switch 1 includes vacuum switch 4, trigger switch 6 and discharge capacity device 5, in each series arm, the other end of isolation switch 3 is connected with the negative pole of one end of vacuum switch 4 and discharge capacity device 5 after being connected respectively, the positive pole of discharge capacity device 5 is connected with the one end triggering switch 6, the other end of triggering switch 6 is connected with output interface after being connected with the other end of vacuum switch 4, the outfan of controller is connected with the control end controlling end and vacuum switch 4 triggering switch 6 respectively.
The control method of combined DC of the present invention switch comprises the following steps:
In the course of the work, controller controls isolation switch 3 Guan Bi in the series arm of any one road, this series arm is denoted as work branch, and other series arm is denoted as emergency bypass, and controller controls isolation switch 3 disconnection on each emergency bypass simultaneously；
When combined DC switchgear needs to carry out closing operation, controller generation switching signal, and described switching signal is forwarded to the control end of DC load switch 1, DC load switch 1 carries out closing operation according to described switching signal；
When described combined DC switchgear needs to turn off operation, controller produces sub-gate signal, and described sub-gate signal is forwarded to the control end of DC load switch 1, DC load switch 1 makes DC load switch 1 disconnection according to described sub-gate signal, extinguish direct-current arc, and bear the recovery voltage after arc, it is achieved the sub-switching operation of DC circuit；
When the electric current through described combined DC switchgear is more than pre-set threshold value, heat effect due to electric current, the fuse of fuse 2 quick fuse voluntarily in work branch, restriction is through the growth of the electric current of described combined DC switchgear, and force described electric current to decline, after described electric current is restricted to default minimum current by the fuse 2 in work branch, owing in work branch, fuse 2 exists tail currents, controller drives DC load switch 1 to open, simultaneously drive the switch of the isolation in work branch 3 to open, and control isolation switch 3 Guan Bi in the emergency bypass of any one road, this emergency bypass is made to turn on, then DC load switch 1 combined floodgate is driven again, complete automatically to change the purpose of fuse 2 and reclosing.
Embodiment one
With reference to Fig. 3, described combined DC switchgear includes the first series arm, the second series arm and DC load switch 1, during work, controller controls isolation switch 3 Guan Bi in the first series arm, isolation switch 3 disconnection in second series arm, can realizing disconnecting when electric current that described combined DC switchs is bigger, wherein, the DC load switch 1 in this combined DC switchgear structure can be vacuum switch, gas switch, solid switch or other any form switch.Fuse 2 in first series arm and the fuse 2 in the second series arm are direct current current-limiting fuse, when when the electric current of described combined DC switchgear is bigger, fuse 2 in first series arm and the fuse 2 in the second series arm can fuse voluntarily, and restriction DC current increases and forces it to decline.
When combined DC switchgear needs to carry out closing operation, controller produces switching signal, and described switching signal is forwarded to the control end of DC load switch 1, DC load switch 1 can carry out closing operation according to described switching signal, so that DC load switch 1 is changed into stable "on" position from gate-dividing state, and keep "on" position.In making process, other devices are all not involved in operation, DC load switch 1 complete independently.
When described combined DC switchgear needs to turn off operation, controller produces sub-gate signal, and described sub-gate signal is forwarded to the control end of DC load switch 1, DC load switch 1 can make DC load switch 1 disconnection according to described sub-gate signal, extinguishes direct-current arc, and bears recovery voltage after arc, realize the sub-switching operation of DC circuit, and gate-dividing state, other devices are not involved in operation, DC load switch 1 complete independently.
When the electric current of combined DC switchgear process is bigger, heat effect due to big electric current, in the first series arm in through-flow circuit, the fuse of fuse 2 fuses voluntarily, the growth of electric current in restriction straight-flow system, and force electric current to decline, after big electric current is restricted to default minimum current by the first fuse 2 in the first series arm, owing in the first series arm, fuse 2 exists tail currents, controller drives DC load switch 5 to open, simultaneously drive the switch of the isolation in the first series arm 3 to open, and control isolation switch 3 Guan Bi in the second series arm, cut the second series arm, then DC load switch 1 combined floodgate is driven again, complete the automatic reclosing function under short-circuit and big overcurrent conditions.
When disconnecting DC current by combined DC switchgear of the present invention, controller controls vacuum switch 4 and opens, due to the existence of direct-current arc between vacuum switch 4 arc gap, circuit now and is not switched off, now conducting triggers switch 6 so that discharge capacity device 5, to vacuum switch 4 back discharge, produces artificial zero crossing between the contact arc gap of vacuum switch 4, extinguish direct-current arc, it is achieved the sub-switching operation of DC circuit.
Claims (1)
1. the control method of a combined DC switch, it is characterized in that, based on combined DC switchgear, described combined DC switchgear includes DC load switch (1), controller, some series arms, and for gathering the Acquisition Circuit of the electric current through described combined DC switchgear, each series arm all includes fuse (2) and isolation switch (3), in each series arm, the outfan of fuse (2) is connected with one end of isolation switch (3), input interface is connected with the input of fuse (2) in each series arm, one end that in each series arm, the other end of isolation switch (3) all switchs (1) with DC load is connected, the other end of DC load switch (1) is connected with output interface, the outfan of Acquisition Circuit is connected with the input of controller, the outfan of controller is connected with the control end of isolation switch (3) in each series arm and the control end of DC load switch (1) respectively；
Described DC load switch (1) includes vacuum switch (4), trigger switch (6) and discharge capacity device (5), in each series arm, the other end of isolation switch (3) is connected with the negative pole of one end of vacuum switch (4) and discharge capacity device (5) after being connected respectively, the positive pole of discharge capacity device (5) is connected with the one end triggering switch (6), trigger after the other end switching (6) is connected with the other end of vacuum switch (4) and be connected with output interface, the outfan of controller is connected with the control end of the control end triggering switch (6) and vacuum switch (4) respectively；
Comprise the following steps:
In the course of the work, controller controls isolation switch (3) Guan Bi in the series arm of any one road, this series arm being denoted as work branch, and other series arm is denoted as emergency bypass, isolation switch (3) that controller controls on each emergency bypass simultaneously disconnects；
When combined DC switchgear needs to carry out closing operation, controller produces switching signal, and described switching signal is forwarded to DC load switch (1) control end, DC load switch (1) carry out closing operation according to described switching signal；
When described combined DC switchgear needs to turn off operation, controller produces sub-gate signal, and described sub-gate signal is forwarded to the control end of DC load switch (1), DC load switch (1) makes DC load switch (1) disconnect according to described sub-gate signal, extinguish direct-current arc, and bear the recovery voltage after arc, it is achieved the sub-switching operation of DC circuit；
When the electric current through described combined DC switchgear is more than pre-set threshold value, heat effect due to electric current, the fuse quick fuse voluntarily of fuse (2) in work branch, restriction is through the growth of the electric current of described combined DC switchgear, and force described electric current to decline, after described electric current is restricted to default minimum current by the fuse (2) in work branch, owing in work branch, fuse (2) exists tail currents, controller drives DC load switch (1) to open, simultaneously drive the switch of the isolation in work branch (3) to open, and control isolation switch (3) Guan Bi in the emergency bypass of any one road, this emergency bypass is made to turn on, then DC load switch (1) is driven to close a floodgate again, complete automatically to change the purpose of fuse (2) and reclosing.
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| CN106229952B (en) * | 2016-08-31 | 2018-12-07 | 许继电气股份有限公司 | Fuse assembling device and control method, dc circuit breaker and control method |
| CN106329496B (en) * | 2016-08-31 | 2018-10-19 | 许继电气股份有限公司 | Quick fuse device and control method, dc circuit breaker and control method |
| CN107317298B (en) * | 2017-06-26 | 2019-10-18 | 张宁 | Automatic recovery type power fuse |
| 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 |
| GB2569185A (en) * | 2017-12-11 | 2019-06-12 | Eaton Intelligent Power Ltd | Fault clearing circuitry |
| CN110460023B (en) * | 2019-08-13 | 2020-11-06 | 湖南大学 | Switch control method of drainage device |
| CN110445116B (en) * | 2019-08-13 | 2020-11-10 | 湖南大学 | Drain control circuit and device |
| CN113555857B (en) * | 2021-07-02 | 2024-05-17 | 西安交通大学 | Quick fusing device based on arc voltage enhanced transfer |
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| CN201226492Y (en) * | 2008-06-16 | 2009-04-22 | 哈尔滨东安发动机（集团）有限公司 | DC voltage-boosting and step-down system with on-line multiple heat backup function |
| CN103021739A (en) * | 2012-11-30 | 2013-04-03 | 西安交通大学 | Hybrid direct-current circuit breaker |
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| JP2014007791A (en) * | 2012-06-21 | 2014-01-16 | Auto Network Gijutsu Kenkyusho:Kk | Power supply device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201226492Y (en) * | 2008-06-16 | 2009-04-22 | 哈尔滨东安发动机（集团）有限公司 | DC voltage-boosting and step-down system with on-line multiple heat backup function |
| CN103021739A (en) * | 2012-11-30 | 2013-04-03 | 西安交通大学 | Hybrid direct-current circuit breaker |
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