Harmonic analysis of multilevel inverter driven by variable speed wind electric generator

The variable speed wind electric generation system was considered in this paper. The modeling of wind turbine using Simplified C block available in PSIM software incorporating active pitch angle control is developed. The Maximum Power Point Tracking (MPPT) algorithm has been developed to extract maximum wind power for all wind speed below the rated value. The wind turbine drives the Permanent Magnet Synchronous Generator (PMSG) feeding a diode bridge rectifier and DC-link capacitor. The constant DC voltage from DC-link capacitor is fed to an inverter which is connected to the three phase load. The study of Multi Level Inverter (MLI) has been carried out. The simulation of Diode - clamped MLI was performed using the elements available in the PSIM. The switched waveform of MLI has lower level of harmonic distortion when compared to two-level converter. Performance evaluation has been carried out. The load current, voltage, power output and efficiency of the converter system have been analyzed.