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The paper envisages measures to reduce the total harmonic distortion (THD) and harmonic spread factor (HSF) of the output voltage of a micro grid inverter. It involves the design of a variable structure controller (VSC) to derive the pulses for operating the switches in the inverter and there from enable the shaping of the output voltage to a nearly sinusoidal form. The methodology originates from the state space model of the system and brings in the control law to govern the operation of the PWM scheme. The framework includes a front end converter to exploit the maximum available power and engages a two stage process to provide a variable ac output to the utilities in the stand alone grid. The MATLAB based simulation results exhibit the performance improvement using the harmonic metrics to regulated output voltage over the range of operating loads and also the prototype registers to validate the simulated response.

Harmonic performance analysis of a wind driven micro grid inverter