一种基于故障录波信息的电网故障诊断方法

在系统发生复杂故障或开关、保护存在较多误动、拒动以及因信道干扰而发生信息丢失等诸多不确定因素的影响下，目前基于开关和保护信息的诊断方法已经不能取得满意的结果，必须寻找新的信息源。随着继电保护及故障录波信息网的建立，丰富的录波信息为进一步诊断提供了基础。根据电力系统目前的实际运行情况和今后的发展，提出了一种合理利用采集信息进行分层故障诊断的方法。对在复杂故障情况下利用故障录波信息作进一步诊断的方法进行了研究，提出了虚拟保护的诊断思想，并建立了相应的面诊断模型，有效地弥补了利用开关、保护信息诊断的局限性。利用组件对象模型（COM）和Windows的动态连接库（DLL）技术建立了通用的、可共享的诊断系统。

A POWER SYSTEM FAULT DIAGNOSIS METHOD BASED ON RECORDED FAULT DATA

When complex fault occurs or uncertain factors appear, such as mal-operation, miss operation and missing messages because of channel disturbance, the existing power system diagnosis methods based on switch and protection messages does not provide satisfactory result, so it is necessary to use a new source of information. Along with the establishment of the information network for protective relaying and fault recorders, the plentiful recorded fault data lay a foundation for further diagnosis of the faults. According to the current operating situations of power systems and its evolution in the future, a new approach to carry out hierarchical fault diagnosis by using the collected messages is proposed. After studying the further diagnosis of complex faults by using the recorded fault messages rationally, a diagnosis thinking of virtual protection is put forward. A corresponding synthetic diagnosis model is established. Thus, the limitations of using the protection and switch messages for fault diagnosis are effectively remedied and a versatile and shareable fault diagnosis system is developed by use of component object mode (COM) and dynamic linking library (DLL) technology.