基于开关变位信息的电网可疑故障元件集识别方法

An Identification Method of Suspicious Faulty Device Aggregate for Power Systems Based on Position Change Information of Breakers

根据现有的电网故障诊断过程,提出在建立系统元件的开关变位次序图的基础上,采用变位开关附近的改进深度优先搜索法确定停电区域。通过计算变位开关的拒动级别将可疑故障元件依故障概率的大小按顺序排列,进一步提高了故障诊断速度。对开关变位信息在传输过程中发生畸变的情况进行了分析,给出了相应的停电区域搜索步骤。对于电网的单一故障、多重故障以及存在保护和开关多次不正确动作的严重故障,该方法均能快速准确地定位停电区域,并给出精简后的可疑故障元件集。

According to existing power system fault diagnosis process, a new method to determine the outage region is proposed. On the basis of building up a pattern of position change sequence of circuit breakers regarded as elements of power system, the outage region is determined by utilizing the improved depth-first searching algorithm in the vicinity of position changed circuit breakers. By means of calculating the miss-operation rank, the suspicious faulty elements are sequenced by the values of fault probability, so the fault diagnosis speed is further speeded up. The condition that the position change information of circuit breakers distorts during the signal transmission is analyzed and corresponding searching procedures for outage region are given. For single fault, multiple fault and the serious faults with malfunction several protections and breakers, the outage region can be located fast and precisely by the proposed method, and the simplified suspicious faulty device aggregate is given.