可控串补潮流控制对距离三段动作裕度的影响  

Power flow control effect with TCSC on the operation margin of zone 3 impedance relays

作　　者：李生虎[1] 丁明[1] 张维[1] 王京景[1] 

机构地区：[1]合肥工业大学电气与自动化工程学院,安徽合肥230009

出　　处：《电力系统保护与控制》2009年第3期5-10,26,共7页Power System Protection and Control

基　　金：国家自然科学基金资助项目(50707006);安徽省优秀青年科技基金资助项目(08040106825)

摘　　要：由于保护范围较长,距离三段保护对重载网络潮流分布较为敏感。作为主要柔性输电元件,可控串补常用于重载电网潮流控制。基于电压函数的距离三段保护动作裕度,建立了串补线路不同受控参数,如线路电抗、线路电流幅值、线路有功潮流,与保护裕度间的灵敏度系数,用以量化可控串补对距离三段的影响。计算结果表明,不同位置、不同受控参数及参考值下,可控串补可能增加或者降低保护裕度。可控串补和距离保护的合理整定,有利于协调保护装置和柔性输电设备,降低重载电网运行风险。Zone 3 impedance relays （mho relays） are sensitive to power flow distribution in stressed conditions due to their overreaching design. In this paper, the operation condition for mho relays is defined by the operation margin between the apparent impedance and the operation impedance. The sensitivities between the operation margin and the controlled parameters of TCSC, such as line reactance, line-current magnitude, and active power flow, are found to quantify the control effect on the relay performance. Numerical results on IEEE RTS system shows that series compensation at different locations, controlled parameters, or reference values, will increase or decrease the operation margin. Studies on the performance of zone 3 relays in compensated system is helpful to the coordination of relay protections and FACTS devices, and quantify the vulnerability of stressed power system.

关 键 词：距离保护 可控串补 潮流控制 灵敏度 输电系统 

分 类 号：TM773[电气工程—电力系统及自动化]