Large-Scale Wind Turbine With Quasi-Z-Source Inverter and Battery

Grid connection of permanent magnet synchronous generator -based wind turbines can be performed through a three-stage power conversion system: 1) uncontrolled rectifier, 2) DC boost converter, and 3) voltage source inverter. In this paper, this topology is modified by replacing the two intermediate stages by a quasi-Z-source inverter (qZSI). Additionally, a battery is integrated with the qZSI without any additional DC/DC converter. This battery will allow reducing the intermittence of the generation and improving the operability of the wind turbine. The application and control of qZSI for large-scale wind turbine with energy storage systems is illustrated in this work. An energy management system is implemented for the proper operation of the wind turbine and the battery. The qZSI is controlled through a Z-Space Vector Modulation (ZSVM) technique to achieve maximum power point tracking in the wind turbine, reactive power control, and battery charge/discharge depending on the operating conditions and the battery state-of-charge. The simulations show the proper behavior of the system under study.