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Parameter optimization method for a fast switch type current limiter and a circuit breaker

A technology of rapid switching and optimization methods, applied in the fields of instruments, genetic models, electrical digital data processing, etc., can solve problems such as differences, mutual constraints, and difficulty in obtaining parameter combinations

Active Publication Date: 2019-05-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing matching methods mostly use trial-and-error method, and multiple sets of tests need to be repeated based on experience, and the influence of parameters on standard requirements is different, mutual constraints in the matching process make it difficult to obtain the best combination of parameters

Method used

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  • Parameter optimization method for a fast switch type current limiter and a circuit breaker
  • Parameter optimization method for a fast switch type current limiter and a circuit breaker
  • Parameter optimization method for a fast switch type current limiter and a circuit breaker

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Embodiment

[0160] In the present embodiment, for the 220kV system, a three-phase short circuit occurs at the outlet of the current limiter and the near area line for calculation and analysis, and the parameters are taken as: U i =180kV, L i =10mH,C FCL = 1nF, C BRK = 1μF, C Bf =4nF,L FCL =3.75mH and N=4. The line parameter is L line = 0.8mH / km and C line =15nF / km, take s=0, 2, 4, 6, 8, 10km, switch withstand voltage U dk It is 20kV, and the rated breaking current of the circuit breaker is 40kA.

[0161] S1. Establish an analysis model for breaking characteristics of a circuit breaker based on a fast switching current limiter.

[0162] When a ground fault occurs at the outlet of the current limiter, the mathematical model of the transient recovery voltage is:

[0163]

[0164] in

[0165] When a near ground fault occurs on the line, the mathematical model of the transient recovery voltage is:

[0166] TRV (s) (X)=αcosωt-βcosω 1 t-(α-β-U Cm ) cos ω 2 t-u C (25)

[01...

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Abstract

The invention belongs to the field of current limiters and circuit breakers, relating to a parameter optimization method for a fast switch type current limiter and a circuit breaker. A circuit breakeron-off characteristic analysis model based on a fast switch type current limiter is used so as to acquire a mathematical model comprising multiple paramaters among a plurality of standard requirements such as the current-limiting inductor, cut voltage-sharing capacitor, current limiter ground capacitor and circuit breaker ground capacitor, transient recovery voltage first reference voltage, firsttransient recovery voltage peak value time, the number of limiter switches and depth of current limiting. A parameter optimization model of the fast switch type current limiter and the circuit breaker is established and parameters of the model by adopting a genetic algorithm are optimized. The parameter optimization method provided by the invention not only can solve the overvoltage problem of the fracture of the current limiter, but also can ensure the reliable disconnection of the circuit breaker, and effectively solves the matching problem of the current limiter and the circuit breaker.

Description

technical field [0001] The invention belongs to the field of current limiters and circuit breakers, and relates to a parameter optimization method of a fast switching current limiter and circuit breakers. Background technique [0002] With the continuous expansion of the scale of the ultra-high voltage power grid and the continuous increase of the current limit depth, the hidden danger of insufficient breaking capacity of the circuit breaker is highlighted, which seriously threatens the safe and stable operation of the power grid. Fault current limiters developed at home and abroad have different topologies and types, mainly including superconducting type, power electronic type, series resonant type and fast switching type fault current limiter. [0003] Due to the high cost of the superconducting current limiter and slow quench recovery speed, the power electronic current limiter is expensive, and the steady-state power consumption and heat generation are serious. For the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06N3/12
Inventor 梁远升王钢陈鑫全李海锋
Owner SOUTH CHINA UNIV OF TECH
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