Voltage Control of Distribution System with High Sharing of Photovoltaic Power Supply Using Grey Wolf Optimization Technique

There are significant restrictions for potential control in the distribution systems that contain photovoltaic (PV) energy resources due to a variable nature of renewable sources and uncertainty of these sources. An optimized method for voltage control has been used in this paper assuming the control of both PV inverter reactive power and on load tap changer (OLTC) step control of distribution transformer. The method aims to mitigate the voltage raise (VR) and voltage drop (VD) and try to keep the voltage within the limits defined by utility companies. To make the control system achieve the desired goals of voltage control, grey wolf optimization technique (GWO) will be applied upon the objective function of the control system. The system under study is 33-IEEE bus system, with four different variable loads (commercials, industrial, residential and lighting) over a day. The time response shows that the implementation of both control technique of the PV inverter and OLTC is superior over implementation of PV-inverter alone.