新型的以变压器为核心结构的限流装置的设计与仿真计算

随着电网容量的不断增加,短路电流将会越来越大,针对日益增加的系统短路电流,研制实用、可靠的短路电流限制器可以解决因短路电流引起的很多系统问题。在分析了目前常见的几种限流器方案的前提下,提出了一种新型的以变压器为核心结构的限流装置,该装置由限流变压器、GTO开关元件和电容器组成,并利用Matlab进行相关仿真和参数选取工作,仿真结果显示,该限流器可以将短路电流由13kA缩减至5kA以下,缩减比例达到70%,限流过程中无瞬态过电压,这充分显示该种限流器具有结构简单、控制方便、易于实现等优点,是今后限流器技术发展的一个方向。

Design and Simulation of a New Short-circuit Current Limiter with Transformer as Core-construct

Short-circuit current will be greater and greater with power grid capacity increasing.Researching applied and reliable Short-circuit current limiter can resolve many problems because of fault current.This paper analyzes several current limiter schemes and puts forward a new current limiter,in which hard-core is consist of transformer.The current limiter consists of transformer,GTO and capacitor.Using Matlab to Simulate and select the parameters,the result shows that the limiter can reduce fault current from 13kA to lower 5kA.Reduction ratio is 70% and there is no hyper-voltage in limiting process.All these explain that this limiter has advantages such as simple structure,convenient control and easy implement.This limiter is a developing direction of current limiter.