Battery-Integrated Power Optimizer for PV-Battery Hybrid Power Generation System

Abstract

Recently, hybrid generation systems combine multiple energy sources or storage components to optimize the characteristics of the individual energy sources. PV-battery hybrid systems usually combine photovoltaic (PV) generation of electricity with energy storage components (i.e. batteries). These systems are often configured as mini-grids in which the generation sources supply loads through a relatively small local distribution grid. In these systems, to improve the utilization of solar energy, the output power mismatch between PV modules due to the non-identical solar irradiance has to be considered. In this paper, a battery integrated PV power optimizer for PV-battery hybrid power generation system is proposed. Proposed system can be applied to the conventional PV hybrid power generation systems, as well as, the normal centralized PV generation systems. By integrating the batteries to the PV power optimizer, PV system using proposed topology can easily increase battery capacity and stabilize input power for central power conditioning system (PCS). Proposed battery integrated power optimizer is verified by simulation results.