Detailed Analysis of Load Voltage Compensation for Dynamic Voltage Restorers

This paper presents detailed analysis of load voltage compensation for dynamic voltage restorer (DVR) that used for enhancing power quality. DVR is a custom power device used to correct voltage sag by injecting voltage as well as power into power distribution system. A method of determining the exact amount of voltage injection required to correct a specific voltage reduction with minimum power injection is described. Analytical expressions for both magnitude and angle of the injected voltage are also derived. It has been shown that a voltage reduction and power factor should be analyzed before compensating the voltage. Simulation results show the performance of the proposed analysis though Matlab/simulink tool