Study of the suitability of recently proposed quasi Z-source inverter for wind power conversion

Abstract

The paper presents quasi z-source inverter (QZSI) as an alternate converter system for single phase wind generator. The QZSI inheriting all the advantages of traditional ZSI replaces the conventional PWM inverter in the system with some of its additional utilities. A closed loop controller is developed which monitors wind generator output and adjusts the inverter shoot-through duty cycle employing third harmonic injection constant boost control technique. The whole system is modeled, analysed and verified through simulation and hardware arrangement. The system can provide stable voltage through proper selection of boost factor. Dynamic and steady states of the proposed system are studied to find out the suitability of maintaining the terminal voltage at desired level for direct-driven wind power system.