Inderscience Publishers

Low distortion three–phase sine PWM using a general purpose micro–controller

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Courtesy of Inderscience Publishers

Three–phase balanced sine–PWM pulses are required for the purpose of generation of sinusoidal output voltage and/or currents from inverters, used for UPS/motor–control applications. Such pulse–generation is possible using micro–controllers/DSPs with PWM output pins. This paper discusses a simple algorithm to generate low distortion balanced three–phase sine–PWM pulses from a general purpose micro–controller, without using PWM pins. It is shown via simulation and experimentation that such an algorithm is capable of achieving current–distortions well below 5%. An inverter, controlled by such an algorithm, is also tested for three–phase AC induction motor control application in V/f mode, using a feed–forward control–methodology. A performance–comparison is made between a general–purpose micro–controller (using the above strategy) and a micro–controller (used for motor–control applications) for the above application–area.

Keywords: pulse width modulation, microcontrollers, THD, AC induction motors, induction motor control, three–phase inverters, constant torque zone, constant power zone, look–up tables, AT89C52, PIC18F4431, current distortion, feedforward control, total harmonic distortion

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