Abstract
This paper presents a battery integrated photovoltaic (PV) system, which maintains grid interconnection at adverse grid conditions. Additionally, the grid power quality is enhanced, and balanced grid currents are achieved under grid voltage distortions, unbalanced grid voltages, and unbalanced load currents. This system utilizes the BES (Battery Energy Storage) to eliminate the intermittencies in the grid power at the variations in PV array power and local loads connected at point of interconnection (POI). The DC-DC boost converter ensures the optimum PV array power utilization. A bi-directional DC-DC converter (BDC) is suitably controlled for the BES charging and discharging. The injected grid power regulated by the BES-PV system, is a function of the prevailing feed-in tariffs, thereby ensuring greater economic benefits, and helps flatten the demand side power curve. This is achieved by proper use of BES. Performance of the BES-PV system at various operating situations, is evaluated in detail.
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