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

LI Sheng-hu,DING Ming,ZHANG Wei,WANG Jing-jing(Hefei University of Technology,Hefei 230009,China)  
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.
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