摘要
由于基本桥路型超导限流器对短路电流稳态值限流效果较小,本文提出了一种改进桥路型高温超导故障限流器。正常工作情况下,限流器四个桥臂上的二极管均导通,对系统无影响;系统发生短路故障后的前100μs内,该限流器像基本桥路型限流器一样立即限制短路电流峰值,其后利用固态开关的切换,将二极管和偏压电源从限流器中退出运行,超导线圈的电感能限制故障电流峰值和稳态值,利用限流电阻与超导线圈串联限流,进一步提高其限流能力,从而使装置能有效地限制短路电流稳态值。实验表明,该限流器具有很好的限流和重合闸能力,能显著减少暂态及稳态的故障电流,有效提高系统动态稳定性和电网电能质量。
An improved rectifier type high temperature super conducting fault current limiter for a three-phase power system is developed in this paper.When normal operating,no current limiting mode occurs through the application of DC bias current to the bridge;the inductance of the coil can limit an increase in a fault current during 100μs after the time of fault.The fault current limiting capability decreases due to the bias DC current.An idea is to put two resistance in series with the superconducting coil for absorbing the incoming energy into the coil,and turn the switch on and off to disconnect the diode and the bias DC voltage source from the improved fault current limiter.The inductance of the coil can limit both an increase in a fault current and the steady-state fault current.The operating theory of the improved fault current limiter is discussed,and the effect of parameters variety of the improved fault current limiter is analyzed for limiting fault current characteristic of the improved fault current limiter.The experimental results show that the device is of good limiting and re-closing capability,and demonstrate that the device can reduce both the transient and the steady-state fault current significantly.The device is of great benefit to improve transient stability and enhance the electrical energy quality of power system.
出处
《电工技术学报》
EI
CSCD
北大核心
2010年第1期70-76,共7页
Transactions of China Electrotechnical Society
基金
国家自然科学基金资助项目(60375001)
关键词
高温超导限流器
直流偏置电压源
整流器
短路电流
High temperature superconducting fault current limiter DC bias voltage source rectifier short-circuit current
