【摘要】 在分析紧急直流功率支援提高系统暂态稳定性机理、静止无功补偿器(SVC)原理及参数设置的基础上,仿真研究了大扰动下SVC对特高压紧急直流功率支援的影响。结果表明:SVC能为换流站交流母线提供无功支持,使其电压在故障后快速恢复,有利于特高压直流功率的快速紧急提升,能更有效地弥补故障后送、受端网区的功率缺额,改善故障后的稳定裕度;安装SVC虽能提高故障后的电压水平却可能会减小熄弧角。故障后500 kV主网形成孤岛情况下,加装SVC能一定程度上改善电压和支援效果,整流侧能减少切机量。更多还原

【Abstract】 The mechanism of EDCPS(Emergency DC Power Support)to enhance transient stability and the principle of SVC(Static Var Compensation),as well as its parameter setting,are introduced,based on which,the influence of SVC on UHV EDCPS under heavy disturbance is analyzed by simulation.Results show that,SVC supports reactive power to inverter AC bus for voltage recovery,which helps rapid UHV EDCPS,making up the power lack of both sending and receiving ends of grid and improving the stability margin after fault.Although SVC raises the after-fault voltage,it may decrease the extinguish angle.Fur- thermore,when 500 kV main grid becomes island after severe accident,SVC improves voltage and supports power to a certain extent,and reduces generator trip at rectifier side.更多还原