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This paper proposes a large scale wind energy conversion system comprising a direct driven PMSG connected to the grid through a power electronic interface. The variable voltage variable frequency output from the wind generator is rectified, boosted and converted in to a fixed voltage fixed frequency output. The boost chopper maintains a constant DC at the inverter terminals. The modulation index of the inverter is adjusted to extract maximum power from the wind. The system components such as wind turbine, PMSG, power electronic interface are modeled in MATLAB/SIMULINK. The performance of the system is investigated for different wind velocities. The effect of duty ratio and modulation index is studied and the results are presented. [ABSTRACT FROM PUBLISHER]

This paper presents the development of three different generalized PWM schemes for a n-phase voltage source inverter (VSI) in matlab/simulink. Multiphase (n-phase) voltage source inverters are dominantly used to supply the multi-phase drives which are used for high power applications. It is necessary to develop suitable switching schemes for the inverters to provide required output voltages to a multiphase machine.The schemes namely SPWM, PWM technique with mth harmonic injection and offset injection are discussed. The performances of the inverter with 5, 7 and 9 phases are analyzed with these switching techniques. The output voltage, THD and current ripple are observed through simulation. The effectiveness of the schemes is compared for different modulation indices and the results are presented. [ABSTRACT FROM PUBLISHER]