Peak Shaving of a Grid connected-Photovoltaic Battery System at Helmholtz Institute Ulm (HIU)

Abstract

High demand of photovoltaic (PV) energy presents a challenge to operation and control of a power system. A Battery Energy Storage System (BESS) is an effective way to shave the peaks and to smooth the load during energy production changes with dynamic power demand. This paper introduces a novel peak shaving method with a PV-battery storage system. The method is tested on a system in U1m, Germany. The PV-battery system has 31 kWp from a PV array, which is connected to a 76 kWh Li-Ion battery with a peak power of 60 kW. The system has been in operation since May 2015. The threshold on load and State of Charge (SOC) of the battery is applied in the peak shaving method. The average of SOC and actual state of energy of the battery are used for the determination of the change in the threshold value on load.