考虑继电保护隐性故障的电力系统连锁故障风险评估

提出了考虑继电保护隐性故障的电力系统连锁故障风险评估方法。采用继电保护隐性故障的概率模型描述保护装置对电力系统风险的影响,通过分析保护系统的机理表明保护装置在连锁故障中的作用,用母线孤立风险、负荷孤立风险、电网解列风险及系统综合风险来评估系统的连锁故障风险,并据此提出了减小系统连锁故障风险的预防措施。应用蒙特卡罗方法产生系统事故、保护装置和隐性故障的随机特性,编写了电力系统连锁故障风险评估与预防软件。IEEE118节点系统的应用结果证明了该方法的可行性及软件的有效性。

Risk Assessment of Power System Cascading Failure Considering Hidden Failures of Protective Relayings

Cascading failure is one of the main causes of blackout. The authors propose an integrated approach to assess the risk of power system cascading failure considering hidden failures in protection system. Two probability models of protection system hidden failures are used to demonstrate their effects on power system risk. The mechanism and scheme of protection system have been analyzed for their contribution to cascading failures after fault occurs. The risk of power system cascading failure is assessed by bus isolated risk, load isolated risk, grid break-up risk and integrated system risk, on this basis the preventive measures to reduce the risk of power system cascading failure is put forward. By means of Monte Carlo simulation approach the stochastic properties of contingencies, protective devices and protection system hidden failures are procreated, and the software for prevention and assessment of the risk of power system cascading failure is developed. The results of applying the proposed method to IEEE 118-bus test system illustrate the feasibility of this method and effectiveness of the developed software.