Research of Out-of-Step Protection System Based on Wide Area Measure System

Out-of-step protection is the worst situation to prevent a power system from collapse in the large-size connection electrified wire netting. If no methods adopted to deal with it, the power grid will blackout. So we must choose the right criteria to detect the synchronization loss, do well with the coordination methods and select the situation and the time to trip the generators. This paper outlines several criteria for detecting the synchronization loss and gives the advantages, disadvantages. It points out that it is worth to adopt ameliorated UCOS Phi criteria based on WAMS. The separate situation is at the connected with lines that the oscillation center located in, not but at the power balance spot. We should do our best to leave the load of related substation in the delivery end. The best separate time is at the soon an oscillation cycle ends because here the electric current of the break implement opening and break off is the least and its concussion is the least. We choose the best separate time at 2~3 oscillation cycle for lower voltage electrified wire netting. For 500 kV electrified wire netting we must separate it as soon as 1~2 oscillation cycle. Now WAMS can commute states and dates every 1.666 ms used light communications, it helps for studied on out-of-step and corresponded in total power grid on hardware. The result indicates that wide area measure system based realtime measure and faced entirely course for power grid is the best direction.