OPEN ACCESS
This paper attempts to disclose the effects of the access of energy storage system on the fluctuations of power and voltage at the point of common coupling (PCC) in distribution networks containing photovoltaic (PV) plants. For this purpose, a photovoltaic/energy storage (PV/ES) power generation model was established and the variations in PCC power and voltage before and after the access of the energy storage system were simulated at different temperatures, access positions and capacities. Besides, the decrease in PCC voltage fluctuations was quantified according to the standard deviation of effective voltage. The simulation results reveal that the access of the energy storage system can effectively suppress the PCC voltage and power fluctuations caused by ambient temperature variation, and thus improve the PCC power quality; the same energy storage system has slightly different suppression effects on PCC voltage fluctuations depending on the access position of the PV plant and PV/ES system; the PCC voltage resistance grows significantly with the capacity expansion of the energy storage system. The research findings shed new light on the access of energy storage system to distribution networks containing PV plants.
photovoltaic/energy storage (PV/ES) system, Real time digital simulator (RTDS), point of common coupling (PCC), temperature, effective voltage
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