Battery Energy Storage System Applied to Wind Power System Based On Z-Source Inverter Connected to Grid

This paper presents a wind power generation system (WPGS) with battery energy storage system (BESS) based on the Z-source inverter (ZSI) with simple boost control. Wind turbines using the squirrel cage induction generator (SCIG) are widely accepted due to their robustness, simplicity, light weight and low cost. The SCIG is connected to the power grid through voltage source converters VSC, and the WPGS is reinforced by the BESS in order to keep grid power balance. The BESS has a battery bank, which is integrated with the system through a bidirectional DC-DC converter (buck-boost). Moreover, the ZSI is an alternative power conversion topology that can both (buck-boost) the input voltage using passive components. The operation of ZSI is analyzed, and the active and reactive power decoupling method is proposed for a double closed-loop control system, which ensures the stability in voltage capacitor of ZSI. Also, the traditional sine pulse width modulation technique is modified to achieve the shoot through characteristic of ZSI. The proposed system has high performance, minimal component count, increased efficiency and reduced cost. Simulation results verify the efficacy of the proposed control strategies.