Performance evaluation of custom power devices in process of motor bus transfer

Quality and continuity of electrical power to sensitive loads especially in power plants and industrial sectors is of great importance. For this reason, bus transfer is used. During the bus transfer interval, sensitive loads especially motors will be interrupted, and may encounter difficulties. So, it is used reactive power compensator and custom power devices to mitigate stress in motors and improve power quality indices. This paper presents the effect of reactive power compensator and custom power devices paralleling with motor in process of bus transfer which is done in two methods: EMTS and STS. Also, it is investigated dynamic performance of induction motor and spin-down curves in condition of discontinuity of power supply and effect of mentioned devices in these curves. Simulations are implemented in PSCAD/EMTDC Software. Achieved results demonstrate appropriate performance of these devices sidelong motors.