【摘要】 现今对于统一潮流控制器提高电力系统稳定性的研究都是基于系统故障切除后通过改变其控制策略来提高系统暂态稳定性。从限流式统一潮流控制器在故障发生和故障切除的2个限流阶段,针对限流器模块分析其对电力系统暂态稳定性的影响,并在标准的220 k V三机九节点系统中进行仿真研究。PSCAD对比仿真结果表明,故障发生后限流式统一潮流控制器能够即刻减小系统发电机输入输出功率的不平衡,提高系统功角稳定性;还能够降低系统电压跌落的幅值,提高系统电压稳定性。更多还原

【Abstract】 Recent researches about unified power flow controller(UPFC) improving power system stability are based on changing its control strategy to improve transient stability after failure clearance. This article analyzed UPFC-FCL’s impact on power system transient stability in view of fault current limiting module during two periods, i.e. failure happening and removing. Simulation research was designed in standard 220 k V system composed of 3 generators and 9 nodes. Comparative simulation results with PSCAD show that after the failure, UPFC-FCL can instantly reduce imbalance between generators’ input and output powers and improve power angle stabilization. It can also reduce system voltage droop amplitude and improve system voltage stability.更多还原