Title :
A Transformerless Hybrid Active Filter Using a Three-Level Pulsewidth Modulation (PWM) Converter for a Medium-Voltage Motor Drive
Author :
Akagi, Hirofumi ; Kondo, Ryota
Author_Institution :
Dept. of Electr. & Electron. Eng., Tokyo Inst. of Technol., Tokyo, Japan
fDate :
6/1/2010 12:00:00 AM
Abstract :
This paper presents a transformerless hybrid active filter integrated into a medium-voltage motor drive for energy savings. This hybrid filter is intended for line harmonic-current mitigation of the three-phase diode rectifier used as the front end of the motor drive. It is based on direct connection of a passive filter tuned to the seventh-harmonic frequency in series with an active filter using a three-level pulsewidth modulated (PWM) converter. This paper provides a theoretical discussion on voltage-balancing control of two split dc capacitors of the active filter. The 400-V 15-kW motor drive system is designed, constructed, and tested, which can be considered as a downscaled model from a medium-voltage motor drive without regenerative braking. Experimental results verify that the hybrid filter has the capability of satisfactory harmonic filtering and stable voltage balancing in all the load conditions.
Keywords :
PWM power convertors; PWM rectifiers; active filters; machine control; motor drives; power harmonic filters; voltage control; PWM converter; line harmonic-current mitigation; medium-voltage motor drive; passive filter; power 15 kW; split dc capacitors; three-level pulsewidth modulation converter; three-phase diode rectifier; transformerless hybrid active filter; voltage 400 V; voltage-balancing control; Active filters; harmonic mitigation; hybrid filters; motor drives; passive filters;
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2009.2040002