Title :
A 6.6-kV transformerless motor drive using a five-level diode-clamped PWM inverter for energy savings of pumps and blowers
Author :
Hatti, Natchpong ; Hasegawa, Kazunori ; Akagi, Hirofumi
Author_Institution :
Dept. of Electr. & Electron. Eng., Tokyo Inst. of Technol., Tokyo
Abstract :
This paper describes a 6.6-kV adjustable-speed motor drive for pumps and blowers without transformer. The power conversion system consists of a front-end diode rectifier, a five-level diode-clamped PWM inverter with a voltage-balancing circuit, and a hybrid active filer for harmonic-current mitigation of the diode rectifier. A 200-V 5.5-kW downscale model is designed, constructed and tested with focus on the five-level PWM inverter. Experimental results obtained from the 200-V downscale model verify the viability and effectiveness of the 6.6-kV adjustable- speed motor drive, showing that the four split dc capacitors are well balanced in all the operating conditions with improvements of operating performance at low inverter modulation indices.
Keywords :
PWM invertors; active filters; motor drives; power harmonic filters; pumps; rectifying circuits; variable speed drives; adjustable-speed motor drive; blowers; five-level diode-clamped PWM inverter; four split dc capacitors; front-end diode rectifier; harmonic-current mitigation; hybrid active filter; power 5.5 kW; pumps; transformerless motor drive; voltage 200 V; voltage 6.6 kV; voltage-balancing circuit; Active filters; Circuits; Costs; Diodes; Insulated gate bipolar transistors; Motor drives; Power system harmonics; Power transformer insulation; Pulse width modulation inverters; Rectifiers;
Conference_Titel :
Power Electronics Specialists Conference, 2008. PESC 2008. IEEE
Conference_Location :
Rhodes
Print_ISBN :
978-1-4244-1667-7
Electronic_ISBN :
0275-9306
DOI :
10.1109/PESC.2008.4591954
