IRPT Based DVR Application for Voltage Enhancement

Maximum load devices are voltage dependent and functioning of such type of devices gets affected either supply voltage goes high or low in comparison with rated voltage of the power system. The instantaneous reactive power theory (IRPT)is an outstanding controlling approach which is used specially for voltage restoration in case of unbalanced power supply when sensitive or non-linear loads are connected at the load terminal. Application of this control scheme provides a balanced voltage which is required for healthy operation of sensitive loads used in automation industry, manufacturing plant, hospitals for patient monitoring. Moreover this paper presents mathematical modifications of voltage, current, real and reactive power. Different compensation ideas help to obtain the substitute of voltage compensation intentions like balanced power supply, pure sinusoidal waveform, reduced THD and unity power factor. Lastly, compensation approaches are implemented in a MATLAB based model of dynamic voltage restorer (DVR) which is installed in distribution part of electrical power system. Simulation results of DVR model shows the DC link voltage, Voltage at PCC, voltage at inverter input, compensated voltage and various results are presented.