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Journal of Applied Sciences
Year: 2006  |  Volume: 6  |  Issue: 9  |  Page No.: 1993 - 1999

A Simulation Model of Solid-state Transfer Switch for Protection in Distribution Systems

M.A. Hannan, Azah Mohamed and Aini Hussain    

Abstract: This study deals with the application of a Solid-state Transfer Switch (SSTS) for protection in the distribution system that has been evaluated through modeling and simulation. The modeling of this SSTS is based on graphic models using the electromagnetic transient simulation program PSCAD/EMTDC. The SSTS for protection in distribution systems has been modeled with the objective of achieving faster interruptions. In the SSTS model, a new control scheme based on Park`s transformation theory and three-phase proportional integral controlled phase locked loop has been proposed. Extensive simulations were carried out to validate the performance of the SSTS to transfer power to the load from a faulted feeder to a healthy one in a short period of time. Simulation results obtained also prove that the SSTS can mitigate voltage sag and protect bus bar voltage from various types of faults. It is observed that the impact of the induction motor load on the performance of the SSTS in which it has a higher time delay to complete the transfer process as compared to the system with static loads. The effectiveness of SSTS was also evaluated under various faults and load conditions and compared with the IEEE benchmark system STS-1 in terms of transfer time.

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