基于继电保护隐藏故障的系统连锁故障风险评估

针对电力系统隐藏故障造成的保护误动问题,提出基于熵权双基点法的电力系统连锁故障风险评估的新方法,在分析隐藏故障成因的基础上建立线路过负荷保护的隐藏故障模型来描述隐藏故障发生的概率。应用风险理论与效用风险函数对过负荷风险指标、失负荷风险指标、电压失稳风险指标和频率偏移风险指标等4个风险指标进行量化,得到风险指标值。结合熵权双基点法法计算出系统线路的风险贴近度。最后根据风险贴近度的计算结果对线路进行风险排序,找出系统中的脆弱线路,并据此提出了减小隐藏故障发生概率的改进措施。对IEEE 10机39节点系统仿真验证了该方法的可行性与正确性,为电力系统的检修维护和运行管理提供了参考和依据。

Risk assessment of power system cascading failures in consideration of protection hidden failure

For the problem of protection mis-operation caused by power system hidden failure, a new method about cascading failure risk assessment of power system is proposed based on entropy TOPSIS.The hidden failure model of overload protection is established on the basis of the analysis about the cause of hidden failure.The risk theory and risk function are used to quantify the four risk indicator which is over-load risk index,loss of load risk index,voltage instability risk index and frequency deviation risk index to get risk index values.Then, the risk degree of each line based on the method of entropy TOPSIS is obtained.We can give the order of lines in the power system according to the results of the risk degree,and the improvement measures are point out to reduce the probability of the hidden fail -ure of the fragile line in system.The simulation results of IEEE 39 node 10 machine system simulation results verify the feasibility and correctness of the method, which provides the reference and basis for the maintenance and operation management of power system.