Voltage Regulation Using PV-DVR Under Various Source Unbalance Conditions

DVR is a series connected power converter dedicatedly installed in-order to regulate the load bus voltages and also to protect the sensitive loads against the voltage fluctuations. The DVR monitors the voltage at the point of connection, sense it and by comparing it to a preset reference voltage it injects the required voltage to maintain the rated value. DVR is designed by series connection of a three phase voltage source converter connected through Coupling Transformer (CT). Conventionally, DVR is designed in voltage control topology but can also be designed in current control mode. AC side of the converter is connected to the three-phase terminal of the CT. The CT in-turn connect the DVR to the transmission line. The DC-side of the DVR is connected across the DC-Battery, conventionally this battery can be charged via grid. In this paper the battery is charged via solar photo-voltaic system. Hence this work proposes the DVR-PV for voltage regulation under various operating conditions of sag and swell in source as well as harmonics and including momentary fluctuations and voltage interruptions. This paper analysis the LLL-G fault, LL-G fault and short term voltage interruption with harmonics injection of the different order in source.