REDUCTION IN FAULT CURRENT AND VOLTAGE DISTORTION USING POWER ELECTRONICS SWITCHING DEVICES

In the grid operation voltage fluctuations and short circuit are two major problems. In this paper a new concept for controlling the grid using combined operation of fault current limiter and Dynamic Voltage Restorer is proposed. By using this topology solution for above two fault is achieved by a single device namely FCL-DVR. Short circuit fault is detected by sensing the load current and its rate of change. The voltage fluctuation is detected by measured change in voltage. In order to protect the grid from blackout and the sensitive equipment from damages, FCL-DVR serves in efficient way. The life and quality of the equipment is improved. Combined operation of FCL-DVR is performed by a bidirectional thyristor switches in the output terminal. Switches are activated under fault condition and de-activated under normal condition. The model of a three phase grid system with different fault condition is simulated using MATLAB SIMULINK software.