Dual Energy Source System (Photovoltaic-Batteries) based on Three-Level Neutral Point Clamping Inverter

This paper deals with a dual energy source system composed of photovoltaic (PV) generator and storage elements (batteries). In this context, power converters are included to ensure the energy flow management and the permanent supply of the load. For this, a boost converter is associated to the PV generator in order to extract the maximum power, and a bidirectional DC-DC converter is connected to the element storage (batteries) to control the Direct Current (DC) bus. To ensure an alternative current supply and improve the power quality, a three-level Neutral Point Clamping (NPC) power inverter is introduced to the proposed energy system. Moreover, an inductance-capacitors (LC) filter is added also to the inverter to eliminate the high frequency harmonics. Intensive simulations are carried-out to demonstrate the effectiveness of the dual energy source system.