PERFORMANCE PARAMETERS OF A PULSE-WIDTH MODULATION VOLTAGE-SOURCE INVERTER WITH PROPORTIONAL-INTEGRAL CONTROLLER UNDER NONIDEAL CONDITIONS

Compared with the traditional pulse-width modulation (PWM) or sinusoid al PWM voltage source inverters (VSIs), the proposed VSI with a propor tional-integral current controller (PI VSI) offers superiority. It inc ludes instantaneous current control and wave shaping, a fixed inverter switching frequency independent of the output frequency resulting in only known harmonics, and free-running carrier operation. An approach to modeling the proposed PI VSI is introduced, an example of the VSI p ower circuitry design is presented, and the PI controller design is di scussed. Finally, the VSI load current is verified for harmonic conten ts and instantaneous current control capabilities, under normal, unbal anced, load outage and load short-circuit conditions.