The coordinated optimal design of a PV-battery system with multiple types of PV arrays and batteries: A case study of power smoothing

Abstract

To investigate the complementary characteristics of various PV arrays and batteries, a coordinated optimal design mathematical optimization approach for a PV-battery system with multi-type PV arrays and multi-type batteries under the smoothing scenario is proposed in this work, targeting at the minimum total cost of the whole system. By solving the proposed model, the optimal design scheme of the whole system, including the PV array types and capacities in the PV generation system, and the battery types and capacities in the battery energy storage system (BESS), can be obtained simultaneously. A case study of a PV-battery system under the smoothing scenario is adopted to verify and illustrate the feasibility and effectiveness of this proposed method. The influences of the multiple types of PV arrays and batteries on the PV-battery system are comprehensively analyzed and discussed. Results show that the minimum electricity curtailment rate of the system solely composed of PV arrays is 1.7%, and the corresponding total cost and power fluctuation ratios between this system and the system composed of PV array 4 and multiple types of batteries are 1:1.4 and 1:1.2, respectively. When the electricity curtailment rate is required to be lower than 1.7%, the utilization of multiple PV arrays and multiple batteries has an advantage in the economy, fluctuation, and curtailment of the PV-battery system. The proposed method in this work can provide effective guidance for the capacity configuration of PV-battery systems.