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Grid Tied PV-BES System with Multitasking Voltage Source Converter

This paper deals with a grid integrated PV (Photovoltaic)-BES (Battery Energy Storage) system ensuring the interruption free power to critical loads with mode transfer capability and power quality enhancement even at distorted grid voltage condition. This PV-BES system feeds pre-specified power to the distribution network at the presence of the generation from PV panel and BES at peak load hours, stores energy in BES during light load hours, thus enhances the utility grid stability and benefits the consumer. The modified first order filter (MFOF) based control, which estimates the amplitude of fundamental frequency load current, and the grid voltage in-phase unit template is used to synchronize the PV-BES system to the distribution network in absence of either generation from the PV panel or BES at the grid tied mode. The load voltage magnitude and nature are regulated by the voltage control in a standalone mode operation. The bidirectional DC-DC converter allows a bidirectional flow of power, thus it enables either charging or discharging of the battery according to generation from the PV panel in the grid integrated mode, and provides an uninterrupted power to critical loads in absence of the PV generation and/or the grid. The synchronization mode control is utilized to transfer from the grid tied mode to islanded mode and vice versa.