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Improvement of Power System Stability by Using New Switching Technique in Bridge-type Fault Current Limiter

机译：在桥式故障限流器中采用新的开关技术提高电力系统的稳定性

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摘要

The bridge-type fault current limiter has the capability of controlling the fault current by controlling the DC reactor current. This fault current limiter is mainly composed of a diode bridge rectifier and a DC reactor. To achieve this capability, a resistor parallel with a semiconductor switch has been used in series with a DC reactor. For this fault current limiter, a control scheme is proposed that uses the DC reactor current as a control variable to improve transient stability of the model power system without measuring any parameters of system. In this article, an analytical and simulation study was conducted on a one-machine infinite-bus system including a bridge-type fault current limiter and the proposed control scheme. Simulation results show that by controlling the turn-on and turn-off times of the switch, i.e., the switching technique, the proposed fault current limiter can not only limit the fault current but also absorb the accelerating energy of the generator, thereby improving power system transient stability. The rotor velocity, maximum output power of the generator, and critical fault clearing time are studied in this article to evaluate the effects of the proposed fault current limiter on power system transient stability.
机译：桥式故障限流器具有通过控制直流电抗器电流来控制故障电流的能力。该故障限流器主要由二极管桥式整流器和直流电抗器组成。为了实现此功能，已将与半导体开关并联的电阻器与DC电抗器串联使用。针对该故障限流器，提出了一种控制方案，该方案使用直流电抗器电流作为控制变量，以提高模型电力系统的暂态稳定性，而无需测量系统的任何参数。在本文中，对包含桥式故障限流器和所提出的控制方案的单机无限总线系统进行了分析和仿真研究。仿真结果表明，通过控制开关的接通和断开时间，即开关技术，提出的故障限流器不仅可以限制故障电流，而且可以吸收发电机的加速能量，从而提高了功率。系统瞬态稳定性。本文研究了转子速度，发电机的最大输出功率和临界故障清除时间，以评估所建议的故障电流限制器对电力系统暂态稳定性的影响。

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