This paper describes a 6.6-kV adjustable-speed motor drive for use in fans, blowers, and pumps without a transformer. The power-conversion system consists of a diode rectifier, a five-level diode-clamped PWM inverter, and a voltage-balancing circuit. A 200-V 5.5-kW downscale model is developed, constructed, and tested. The five-level PWM inverter and the voltage-balancing circuit are studied in detail. Experimental results obtained from testing the 200-V downscale model confirm the viability and effectiveness of the 6.6-kV adjustable-speed motor drive, indicating that the dc mean voltages of the four split dc capacitors are well balanced under all the given operating conditions.
.jpg)
Discussion(0)
No comments yet. Be the first to comment.