Study On Power System Fault Location Based On Wide Area Measurement System

Backup protection is very important to power system safe operation. But traditional backup protection based on local signals can not meet the requirements of power system security, and even accelerates system collapse in some situations. Therefore it is imperative to study backup protection system based on global information. This dissertation studied formation and updating of the protection correlation region (PCR), and confirmation of the fault correlation region (FCR) in the first instance. On this basis, two different fault location methods were proposed:One was based on fault correlation factor (FCF). It calculated FCF in real time to locate the fault. This method was immune to the mode of operation and was able to identify fault location sensitively and reliably with limited measurement points and less computation. The other was based on branch correlation degree (BCD). It calculated BCD in real time to locate the fault. This method solved the uncertainty of post-fault network matrix, thus needed no modification of network matrix, and had low computational complexity. The simulation results verified the effectiveness and feasibility of the two methods.