Abstract
ABSTRACTVoltage sag is a major issue of power quality among utility and end users. Critical load is sensitive to voltage variation at its terminal. This happens when voltage variation is introduced as voltage sag in the source voltage to which the load is connected. In this paper, the authors have proposed a modified sliding mode control (SMC) method to control the voltage injection by the dynamic voltage restorer (DVR) for regulating the terminal voltage of the critical load to restore its pre-sag value. SMC being independent of system parameters is a robust control. The paper discusses the design and working of control algorithm based on synchronous reference frame theory to generate reference voltages for DVR control. The performance results are obtained and validated by simulating the system in MATLAB software using Simulink and Power System Blocksets.
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