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Failure current limit device based on the rectifying bridge and bidirectional switch switching

A bidirectional switch and fault current limiting technology, which is applied to emergency protection circuit devices, circuit devices, emergency protection circuit devices, etc. for limiting overcurrent/overvoltage, can solve the problem of weak current limiting function and unable to limit short-circuit current steady state Value and other issues

Inactive Publication Date: 2010-05-19
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current limiter can only limit the current rise rate at the initial stage of the fault, but cannot limit the steady-state value of the short-circuit current, and the current limiting function is weak

Method used

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  • Failure current limit device based on the rectifying bridge and bidirectional switch switching
  • Failure current limit device based on the rectifying bridge and bidirectional switch switching
  • Failure current limit device based on the rectifying bridge and bidirectional switch switching

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Embodiment 1, as image 3 As shown, the fault current limiting device based on the rectifier bridge and bidirectional switching includes a bridge circuit composed of electronic switches ES1, ES2, ES3 and ES4, a DC current limiting reactor L1 and a DC bias power supply Eb; among them, the electronic switch ES1 One end of the electronic switch ES3 and one end of the DC current limiting reactor L1 are connected together; the other end of the DC current limiting reactor L1 is connected together with the negative pole of the DC bias power supply Eb; one end of the electronic switch ES2, the electronic switch One end of ES4 is connected with the positive pole of DC bias power supply Eb.

[0021] The two-way electronic switches ES1, ES2, ES3 and ES4 are all composed of two thyristors SCR connected in antiparallel. When the system is normal, control thyristors T1, T2, T3, and T4 to be in the normally-on state, and control T5, T6, T7, and T8 to be in the off state, then the bri...

Embodiment 2

[0022] Embodiment 2, as Figure 4 As shown, it is basically the same as Embodiment 1, except that the electronic switches ES1 and ES4 are bidirectional controllable electronic switches, and ES2 and ES3 are unidirectional controllable electronic switches. Under normal system conditions, the control switch tubes T1, T2, T3, and T4 are in the normally-on state, and T5, T6 are turned off. The bridge is in an uncontrolled rectification state. The function and characteristics of the current limiter in the circuit are the same as the above example. When a short-circuit fault occurs, the current in L1 rises rapidly. When it is detected that the current of L1 is greater than a certain set value, the control turns off T2 and T3 and turns on T1, T5, T4, and T6, then L1 is connected in series to the AC circuit, and L1 can limit the steady-state value of the short-circuit current in the AC circuit . The circuit compares with image 3 The scheme shown uses two fewer tubes. After a short...

Embodiment 3

[0023] Embodiment 3, as Figure 5 As shown, it is basically the same as Embodiment 2, the difference is that in this solution, the controllable bidirectional electronic switch can only be controlled in one direction, and the other direction is not controllable. Under normal circumstances, control T2 and T3 to turn on, and T1 and T4 to turn off, then D1, D2, T2 and T3 form an uncontrolled rectifier bridge. After the short-circuit fault occurs, turn off the T2 and T3 tubes, control the T1 and T4 tubes to be in the normally-on state, and then the inductor L1 is connected in series with the AC circuit to limit the steady-state value of the short-circuit current. The parameter calculation of this circuit is attached with Figure 4 Scheme shown, but simpler and less expensive.

[0024] In the above solution, the controllable electronic switch adopts a silicon controlled rectifier or a combination of a silicon controlled rectifier and a diode, or a self-turn-off device, such as IGB...

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Abstract

The invention discloses a fault limit flow method which is based on the rectification bridge and the double throw switch swithing, used bidirectional and unidirectional controllable electronic switching, composed a bridge path, in the electrical power system normal situation, controlled the bridge path work to no control rectification condition, once short-circuited fault occurrence, controlled the bridge path work immediately to two double throw switches conditions, would used for the current limiting super conductivity reactor or the conventional reactor string enters the exchange power supply system, limited the steady state value of the short-circuit current. At the same time, also discloses the fault current limiting equipment based on this method. This invention method and equipmentapply to the alternating voltage power supply system, not only the initial period short-circuit current climbing rate of limiting short-circuit fault, also can limit short-circuit steady state value of occurring the short-circuit fault.

Description

technical field [0001] The invention is a device applied to an AC voltage power supply system to limit the short-circuit fault current and its rising rate, and belongs to the technical field of AC flexible power transmission technology. Specifically, it is a fault current limiting device based on rectifier bridge and bidirectional switching Background technique [0002] With the continuous expansion of power system scale and capacity, the level of short-circuit current increases rapidly. When the level of short-circuit current exceeds the breaking capacity of circuit breakers, short-circuit faults may cause serious damage to major power equipment such as transformers, high-voltage switchgear, and power cables. damage, causing system instability, or even system paralysis. The short-circuit fault current limiter, after detecting the occurrence of a short-circuit fault, quickly changes the impedance parameters of the fault line to limit the short-circuit current to an allowabl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/02
CPCY02E40/69Y02E40/60
Inventor 费万民张艳莉
Owner NANJING NORMAL UNIVERSITY
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