基于改进状态空间分割法的继电保护设备拒动风险评估

继电保护设备隐性故障已经成为导致电力系统连锁故障的重要因素.因此,在电力系统的风险分析中,需要突破传统N-1故障设置假设,考虑受继电保护设备隐性故障影响的N-k连锁故障.针对继电保护设备拒动引发连锁故障的问题,首先根据继电保护设备的功能模块建立继电保护设备拒动故障树模型;然后综合考虑元件固有失效率和运行信息,建立继电保护设备拒动概率动态评估模型.基于此,提出一种改进的状态空间分割法对电力系统面临的连锁故障风险进行分析,实现了在枚举空间和抽样空间中进行连锁故障搜索,可提高连锁故障搜索的完备性和风险分析的计算效率.最后,在仿真中验证了所提方法的有效性.

Risk assessment of relay protection equipment rejection based on improved state space partitioning method

Hidden failures of relay protection equipment have become an important factor causing electric power system cascading failures. Therefore, in the risk analysis of electric power system, it is necessary to break through the traditional N-1 failure setting assumption, and consider N-k cascading failures affected by hidden failures of relay protection equipment. Aiming at the problem that relay protection equipment rejection causes electric power system cascading failures, firstly a fault tree model of relay protection equipment rejection is built according to the function modules of the relay protection equipment. Then conside-ring the inherent failure rate and operation information of the components, a dynamic probability assessment model for relay protection equipment rejection is built. Based on this, an improved state space partitioning method is proposed to analyze the cascading failure risk faced by electric power system, which realizes cascading failure search in enumeration space and sampling space, and can improve the completeness of cascading failure search and the computational efficiency of risk analysis. Finally, the effectiveness of the proposed method is verified by simulation.