Operation Strategy of Shared ESS Based on Power Sensitivity Analysis to Minimize PV Curtailment and Maximize Profit

Abstract

Nowadays, due to the renewable energy policy, the penetration of photovoltaic (PV) has increased, but the curtailment of PV output power has also increased. However, for PV power producers, who earn profit from selling power to the utility, this kind of curtailment will lead to a decline in their profit. Thus it is necessary to determine how to perform proper curtailment for them. This study proposes a shared energy storage system (ESS) operation strategy based on the power flow at the points of common coupling (PCC) and the power sensitivity of the line loss effect between buses where each PV power producer is located. The proposed algorithm maximizes the overall regional profit through arbitrage trading of shared ESS and performs a curtailment that reduces the effect of line loss at the PCC points. The performance verification of the proposed algorithm is conducted through a simulation on MATLAB, the benefits of shared ESS and the economic feasibility of reducing the curtailment are also analyzed. Moreover, the results of shared ESS benefits and curtailment allocations based on power sensitivity are analyzed for each PV power producer. The results show an improved local profit and PCC power flow.