CN107171303B - A kind of short circuit current blocking circuit - Google Patents

A kind of short circuit current blocking circuit Download PDF

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Publication number
CN107171303B
CN107171303B CN201710384387.9A CN201710384387A CN107171303B CN 107171303 B CN107171303 B CN 107171303B CN 201710384387 A CN201710384387 A CN 201710384387A CN 107171303 B CN107171303 B CN 107171303B
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thyristor
circuit
diode
anode
cathode
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CN107171303A (en
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王鹿军
杨振宇
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Hubei University of Technology
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Hubei University of Technology
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • H02H9/028—Current limitation by detuning a series resonant circuit
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Abstract

The invention belongs to power electronics fields, and in particular to a kind of short circuit current blocking circuit.The circuit includes an inductance L1, a capacitor C1, two diodes D1, D2 and six thyristors T1, T2, T3, T4, T5, T6.By circuit tandem working of the present invention in power grid, when short trouble does not occur, this circuit is in resonant operational state, does not generate pressure drop substantially；After short trouble occurs, by controlling the conducting and judgement of respective thyristor, short circuit current can be quickly blocked.Compared with previous power electronics type fault current limiter, fast response time of the present invention, can not only limiting short-circuit current, can more block short circuit current completely, can be used as breaker use.

Description

A kind of short circuit current blocking circuit
Technical field
The invention belongs to power electronics fields, and in particular to a kind of short circuit current blocking circuit.
Background technique
After short trouble occurs for power grid, for the further expansion of fault restriction range, guarantee the safe and reliable of system Operation, needs to take measures quickly and effectively to limit or block short circuit current.
Conventional method is short circuit current to be blocked using devices such as fuse or breakers, but fuse belongs to disposable production Product need to replace in time after fusing, and breaker actuation needs certain time, is not able to satisfy the requirement of certain sensitive loads.Closely Nian Lai, with power electronic devices, new material and the continuous development for controlling chip, various New Fault Current Limiters occur in succession, Including power electronics type (also known as solid-state version), superconductor type, explosion type etc..However existing fault current limiter be only capable of limiting it is short Road electric current need to cooperate breaker to use, and the demand of short circuit current is quickly blocked when can not fully meet to electric network fault.
Summary of the invention
It is quickly blocked when in order to overcome the shortcomings of the prior art described above, it is an object of the invention to be directed to electric network fault The demand of short circuit current, thus propose that a kind of short circuit current blocks circuit, compared with previous power electronics type fault current limiter, this Invention fast response time, can not only limiting short-circuit current, can more block short circuit current completely, can be used as breaker use.
In order to achieve the above object, the technical scheme adopted by the invention is that: a kind of short circuit current blocks circuit, including one A inductance L1, a capacitor C1, two diodes D1, D2 and six thyristors T1, T2, T3, T4, T5, T6, it is characterised in that:
(1) inductance L1 and capacitor C1 is connected in series；
(2) thyristor T1 and diode D1 is connected in parallel, and the cathode of the positive grade connection diode D1 of thyristor T1, brilliant lock The anode of the cathode connection diode D1 of pipe T1；
(3) thyristor T2 and diode D2 is connected in parallel；And the cathode of the positive grade connection diode D2 of thyristor T2, brilliant lock The anode of the cathode connection diode D2 of pipe T2；
(4) thyristor T4 is in parallel with thyristor T5 is connected in parallel with inductance L1, and the anode of thyristor T4, thyristor T5 Cathode is connect with a terminal of inductance L1, another terminal of the cathode of thyristor T4, the anode of thyristor T5 and inductance L1 Connection；
(5) anode of diode D1 is connect with the anode of thyristor T4；
(6) capacitor C1 is connect with diode D2；
(7) thyristor T3 anode is connect with diode D2 cathode, and thyristor T3 cathode is connect with diode D1 cathode；
(8) thyristor T6 anode is connect with diode D2 anode, and thyristor T6 cathode is connect with diode D1 anode.
Further, there are two port P1 and P2 for the circuit tool.
Further, inductance L1 and capacitor C1 work meets in tandem working state, parameter value:
Wherein, between ω P1, P2 electric current frequency.
Further, when circuit is connected in AC power cord, does not start block function, the control of thyristor T1, T2 Pole signal is high level, and thyristor T3, T4, T5, T6 control electrode signal is low level, and electric current is along P1-D1-L1-C1- at this time The path of D2-P2 or P2-T2-C1-L1-P1 is circulated, and due to L1, C1 work and series resonance state, blocks circuit substantially not Generate pressure drop.
Further, when circuit is connected in AC power cord, after starting block function, the control electrode of thyristor T1, T2 Signal is low level, and thyristor T3, T4, T5, T6 control electrode signal is high level, and inductance L1 is short-circuited at this time, and P1 flows if it exists To the electric current of P2, then current flow paths are P1-D1-T4-C1-D2-P2, and P2 flows to the electric current of P1 if it exists, then current flowing Path is P2-T3-T4-C1-T6-P1；No matter current direction i.e. between P1, P2, filled by T4 to capacitor C1 one direction Electricity finally makes capacitor C1 voltage sufficiently high, blocks electric current between P1, P2.
Compared with prior art, the invention has the following advantages that (1) circuit of the present invention is connected in AC power cord, when When short trouble not occurring, circuit of the present invention works in normal mode, and wherein inductance capacitance is in resonant state, does not generate substantially Pressure drop does not influence primary circuit performance；(2) after short trouble occurs, circuit of the present invention passes through the conducting of control respective thyristor And judgement, it is in blocking state rapidly, can quickly block short circuit current.(3) circuit of the present invention can be used as breaker use, and its Its fault current limiter can only fault current limiting, fault current cannot be blocked, breaker need to be cooperated to use.
Detailed description of the invention
Fig. 1 is circuit topological structure schematic diagram of the present invention.
Fig. 2 is equivalent circuit diagram of the circuit of the present invention in inactive block function.
Fig. 3 is equivalent circuit diagram of the circuit of the present invention after starting block function.
Input and output voltage waveform when Fig. 4 is circuit of the present invention inactive block function, wherein (a) is input voltage wave Voltage waveform at shape, that is, P1；It (b) is voltage waveform at output voltage waveforms, that is, P2.
Fig. 5 is to use circuit of the present invention, and short trouble occurs in power grid, starts input-output wave shape after block function, In, (a) is input voltage waveform；(b) it is output voltage waveforms, (c) is input side current waveform.
Specific embodiment
For the ease of those of ordinary skill in the art understand and implement the present invention, below with reference to embodiment to the present invention make into The detailed description of one step, it should be understood that implementation example described herein is merely to illustrate and explain the present invention, and is not used to limit The fixed present invention.
If Fig. 1 is the topological structure schematic diagram that a kind of short circuit current of the present invention blocks circuit, mainly include an inductance L1, One capacitor C1, two diodes (D1, D2) and six thyristors (T1, T2, T3, T4, T5, T6), the connection relationship of each element As shown in Figure 1.Wherein:
(1) inductance L1 and capacitor C1 is connected in series；
(2) thyristor T1 and diode D1 is connected in parallel, and the cathode of the positive grade connection diode D1 of thyristor T1, brilliant lock The anode of the cathode connection diode D1 of pipe T1；
(3) thyristor T2 and diode D2 is connected in parallel；And the cathode of the positive grade connection diode D2 of thyristor T2, brilliant lock The anode of the cathode connection diode D2 of pipe T2；
(4) thyristor T4 is in parallel with thyristor T5 is connected in parallel with inductance L1, and the anode of thyristor T4, thyristor T5 Cathode is connect with a terminal of inductance L1, another terminal of the cathode of thyristor T4, the anode of thyristor T5 and inductance L1 Connection；
(5) anode of diode D1 is connect with the anode of thyristor T4；
(6) capacitor C1 is connect with diode D2；
(7) thyristor T3 anode is connect with diode D2 cathode, and thyristor T3 cathode is connect with diode D1 cathode；
(8) thyristor T6 anode is connect with diode D2 anode, and thyristor T6 cathode is connect with diode D1 anode.
The short circuit current blocks circuit, and there are two port P1 and P2 for tool.
Inductance L1 and capacitor C1 work meets in tandem working state, parameter value:
The wherein frequency of ω electric current between P1, P2.
When circuit of the present invention is connected in AC power cord, does not start block function, the control electrode of thyristor T1, T2 are believed Number be high level, thyristor T3, T4, T5, T6 control electrode signal be low level.Electric current is along P1-D1-L1-C1-D2-P2 at this time Or the path circulation of P2-T2-C1-L1-P1 blocks circuit not generate pressure substantially due to L1, C1 work and series resonance state Drop.
When circuit of the present invention is connected in AC power cord, after starting block function, the control electrode signal of thyristor T1, T2 For low level, thyristor T3, T4, T5, T6 control electrode signal is high level.Inductance L1 is short-circuited at this time, and P1 flows to P2 if it exists Electric current, then current flow paths be P1-D1-T4-C1-D2-P2, P2 flows to the electric current of P1 if it exists, then current flow paths For P2-T3-T4-C1-T6-P1；No matter current direction i.e. between P1, P2, charged by T4 to capacitor C1 one direction, most Make capacitor C1 voltage sufficiently high eventually, blocks electric current between P1, P2.
Fig. 2 is that short circuit current of the invention blocks equivalent circuit diagram of the circuit in inactive block function.At this time in Fig. 1 Thyristor T1, T2 control electrode signal be high level, thyristor T3, T4, T5, T6 control electrode signal be low level, the present invention Circuit can be equivalent to structure shown in Fig. 2, and wherein inductance L1, capacitor C1 work in series resonance state.
Fig. 3 is that a kind of short circuit current of the present invention blocks equivalent circuit diagram of the circuit after starting block function.Brilliant lock at this time The control electrode signal of pipe T1, T2 are low level, and thyristor T3, T4, T5, T6 control electrode signal is high level, this circuit can be equivalent It is a half-controlled rectifier circuit for structure shown in Fig. 3, it, can be by blocking electricity to capacitor charging no matter current direction Stream circulation.
Input and output voltage waveform when Fig. 4 is circuit of the present invention inactive block function, wherein (a) is input voltage Voltage waveform at waveform, that is, P1；It (b) is voltage waveform at output voltage waveforms, that is, P2.It can be seen that Fig. 4 (b) waveform and Fig. 4 (a) Waveform it is almost the same；I.e. inactive block function when this circuit on former route substantially without influence.
Fig. 5 uses circuit of the present invention, and short trouble occurs in power grid, starts input-output wave shape after block function, wherein It (a) is input voltage waveform；(b) it is output voltage waveforms, (c) is input side current waveform.Route breaks down at 0.1s, From Fig. 5 (a) it can be seen that restoring normal after input voltage brief fluctuations rapidly, that is, have substantially no effect on to other line powerings, from Fig. 5 (b) is it can be seen that output voltage is quickly decreased to 0 after short trouble generation；From Fig. 5 (c) it can be seen that input side electric current Because occurring to be quickly decreased to 0 again after short circuit increases, i.e. this circuit has blocked rapidly short circuit current.
The result of invention: a kind of short circuit current blocking circuit is given in the present invention, and soft using the emulation of the power supply of profession Part Saber has carried out simulating, verifying to the circuit.From simulation result, it can be seen that, the program can rapidly be hindered in line fault Disconnected short circuit current, while voltage when route works normally, compared to protective device, circuit response speed of the present invention are not influenced Fastly, control method is flexible, with good application prospect.
It should be understood that the part that this specification does not elaborate belongs to the prior art.
It should be understood that the above-mentioned description for preferred embodiment is more detailed, can not therefore be considered to this The limitation of invention patent protection range, those skilled in the art under the inspiration of the present invention, are not departing from power of the present invention Benefit requires to make replacement or deformation under protected ambit, fall within the scope of protection of the present invention, this hair It is bright range is claimed to be determined by the appended claims.

Claims (5)

1.一种短路电流阻断电路，包括一个电感L1、一个电容C1、两个二极管D1、D2，和六个晶闸管T1、T2、T3、T4、T5、T6，其特征在于：1. a short-circuit current blocking circuit, comprising an inductance L1, a capacitor C1, two diodes D1, D2, and six thyristors T1, T2, T3, T4, T5, T6, characterized in that: (1)电感L1与电容C1串联连接；(1) The inductor L1 is connected in series with the capacitor C1; (2)晶闸管T1与二极管D1并联连接，且晶闸管T1的阳级连接二极管D1的阴极，晶闸管T1的阴极连接二极管D1的阳极；(2) The thyristor T1 is connected in parallel with the diode D1, and the anode of the thyristor T1 is connected to the cathode of the diode D1, and the cathode of the thyristor T1 is connected to the anode of the diode D1; (3)晶闸管T2与二极管D2并联连接；且晶闸管T2的阳级连接二极管D2的阴极，晶闸管T2的阴极连接二极管D2的阳极；(3) The thyristor T2 is connected in parallel with the diode D2; and the anode of the thyristor T2 is connected to the cathode of the diode D2, and the cathode of the thyristor T2 is connected to the anode of the diode D2; (4)晶闸管T4与晶闸管T5并联与电感L1并联连接，且晶闸管T4的阳极、晶闸管T5的阴极与电感L1的一个端子连接，晶闸管T4的阴极、晶闸管T5的阳极与电感L1的另一个端子连接；(4) The thyristor T4 and the thyristor T5 are connected in parallel with the inductor L1, and the anode of the thyristor T4 and the cathode of the thyristor T5 are connected to one terminal of the inductor L1, and the cathode of the thyristor T4 and the anode of the thyristor T5 are connected to the other terminal of the inductor L1. ; (5)二极管D1的阴极与晶闸管T4的阳极连接；(5) The cathode of the diode D1 is connected to the anode of the thyristor T4; (6)电容C1与二极管D2连接；(6) The capacitor C1 is connected to the diode D2; (7)晶闸管T3阳极与二极管D2阴极连接，晶闸管T3阴极与二极管D1阴极连接；(7) The anode of the thyristor T3 is connected to the cathode of the diode D2, and the cathode of the thyristor T3 is connected to the cathode of the diode D1; (8)晶闸管T6阳极与二极管D2阳极连接，晶闸管T6阴极与二极管D1阳极连接。(8) The anode of the thyristor T6 is connected to the anode of the diode D2, and the cathode of the thyristor T6 is connected to the anode of the diode D1. 2.如权利要求1所述的一种短路电流阻断电路，其特征在于：所述电路具有两个端口P1和P2。2 . The short-circuit current blocking circuit according to claim 1 , wherein the circuit has two ports P1 and P2 . 3 . 3.如权利要求2所述的一种短路电流阻断电路，其特征在于：电感L1和电容C1工作在串联工作状态，其参数取值满足：3. A kind of short-circuit current blocking circuit as claimed in claim 2, it is characterized in that: inductor L1 and capacitor C1 work in series working state, and its parameter value satisfies: 其中，ω为P1、P2之间电流的频率。Among them, ω is the frequency of the current between P1 and P2. 4.如权利要求2或3所述的一种短路电流阻断电路，其特征在于：当电路串联在交流电源线中，不启动阻断功能时，晶闸管T1、T2的控制极信号为高电平，晶闸管T3、T4、T5、T6控制极信号为低电平，此时电流沿着P1-D1-L1-C1-D2-P2或者P2-T2-C1-L1-P1的路径流通，由于L1、C1工作与串联谐振状态，阻断电路基本不产生压降。4. A short-circuit current blocking circuit as claimed in claim 2 or 3, characterized in that: when the circuit is connected in series in the AC power line and the blocking function is not activated, the control pole signals of the thyristors T1 and T2 are high voltage level, the control pole signals of thyristors T3, T4, T5, and T6 are at low level. At this time, the current flows along the path of P1-D1-L1-C1-D2-P2 or P2-T2-C1-L1-P1, because L1 , C1 work and series resonance state, the blocking circuit basically does not produce voltage drop. 5.如权利要求2或3所述的一种短路电流阻断电路，其特征在于：当电路串联在交流电源线中，启动阻断功能后，晶闸管T1、T2的控制极信号为低电平，晶闸管T3、T4、T5、T6控制极信号为高电平，此时电感L1被短路，若存在P1流向P2的电流，则电流流通路径为P1-D1-T4-C1-D2-P2，若存在P2流向P1的电流，则电流流通路径为P2-T3-T4-C1-T6-P1；即不论P1、P2之间电流方向如何，均通过T4给电容C1单方向充电，最终使得电容C1电压足够高，阻断P1、P2间电流。5. A short-circuit current blocking circuit according to claim 2 or 3, characterized in that: when the circuit is connected in series in the AC power line, after the blocking function is activated, the gate signals of the thyristors T1 and T2 are low level , the control pole signals of thyristors T3, T4, T5, and T6 are high, and the inductor L1 is short-circuited. If there is a current flowing from P1 to P2, the current flow path is P1-D1-T4-C1-D2-P2, if There is a current flowing from P2 to P1, and the current flow path is P2-T3-T4-C1-T6-P1; that is, regardless of the current direction between P1 and P2, the capacitor C1 is charged in one direction through T4, and finally the voltage of the capacitor C1 is made. High enough to block the current between P1 and P2.
CN201710384387.9A 2017-05-26 2017-05-26 A kind of short circuit current blocking circuit Active CN107171303B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109962462B (en) * 2019-01-28 2021-03-02 湖北工业大学 A bidirectional current blocking circuit for DC power grid based on series switch
CN113078618A (en) * 2021-03-08 2021-07-06 珠海润科电力设备有限公司 PT blocking method and device based on thyristor

Citations (4)

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Publication number Priority date Publication date Assignee Title
CN202197096U (en) * 2011-09-14 2012-04-18 广东电网公司电力科学研究院 Short-circuit current limiter of electric power system
WO2013176410A1 (en) * 2012-05-22 2013-11-28 (주)그린파워 Secondary protection circuit of wireless power transmission device
CN105375454A (en) * 2015-11-12 2016-03-02 国网山东省电力公司电力科学研究院 Short circuit fault current limiter
WO2016138089A1 (en) * 2015-02-26 2016-09-01 Raytheon Company Robust solid-state circuit protection apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202197096U (en) * 2011-09-14 2012-04-18 广东电网公司电力科学研究院 Short-circuit current limiter of electric power system
WO2013176410A1 (en) * 2012-05-22 2013-11-28 (주)그린파워 Secondary protection circuit of wireless power transmission device
WO2016138089A1 (en) * 2015-02-26 2016-09-01 Raytheon Company Robust solid-state circuit protection apparatus
CN105375454A (en) * 2015-11-12 2016-03-02 国网山东省电力公司电力科学研究院 Short circuit fault current limiter

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