Abstract: This paper presents a flexible design of a PV power conditioning system with energy storage. The planned conditioning unit contains a boost converter (BC), a single-phase inverter, and a bidirectional dc/dc converter connected to the PV side of the BC. The BC regulates the dc-link bus-voltage. The bidirectional dc/dc converter endures battery bank charge/discharge control and PV maximum power point tracking (MPPT). Such design guarantees no change in controller configuration once the storage disconnects. Therefore, the previously required supervisory controller is eliminated. A system control strategy based on sliding-mode control (SMC) ensures a reliable output voltage regulation like fast dynamic response, small steady-state error, and low total harmonic distortion (THD) under step changes and nonlinear loads. A standalone photovoltaic (PV) system with energy storage needs complex control design to require into account the varied operating modes. This paper presents a flexible design of a PV power conditioning system with energy storage is executed.
Keywords: flexible stand-alone, photovoltaic (PV), PV system, Sliding-Mode Control (SMC), THD.