A review on optimization and coordination of under frequency/voltage load shedding

作者：Xue, Yusheng; Ren, Xiancheng; Wu, Q.H.; Wei, Hua

来源：Automation of Electric Power Systems, 2009, 33(9): 100-107.

• Coordination
• Corrective control
• Risk minimization
• The third defense-line
• Under voltage load shedding
• Underfrequency load-shedding

Concerning the time-space-physics risk management of the non-autonomous nonlinear control of under-frequency load shedding (UFLS) and under-voltage load shedding (UVLS), this paper reviews its essentials, characteristics, problem-solving techniques, current status and prospects. The factors include the objective function, constraints, fault set, control modes, controller location, executing moment and optimization strategies. The conventional setup method for load shedding is based on a single-machine single-load model and cannot satisfy the requirement of modern power systems. A new methodology is proposed, which is based on risk management and quantitative analysis for the time response curves. It employs the ratio between safety margin and control cost to guide the risk minimization process. Furthermore, the mechanism of load shedding is investigated;coordination between UFLS and UVLS, that between feedback control and feed-forward control, and that among transient-term load shedding, middle-term load shedding and long-term load shedding are studied. This work is jointly supported by National Natural Science Foundation of China (No. 50595413) and State Grid Corporation of China (No. SGKJ [2007] 98 &187 &2009).

• 出版日期2009-5-10
• 单位广西大学; 东南大学