Title :
A transformerless hybrid active filter using a three-level 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
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 harmonic-current mitigation of the three-phase diode rectifier used as the front end of the motor drive. It consists of a passive filter tuned to the seventh-harmonic frequency and an active filter using a three-level PWM converter. This paper makes a theoretical discussion on voltage-balancing control of two split DC capacitors of the active filter. An experimental system rated at 400 V and 15 kW is designed and constructed, which is scaled down from a 6.6-kV 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 operating conditions.
Keywords :
PWM power convertors; active filters; motor drives; power harmonic filters; rectifying circuits; voltage control; DC capacitors; energy saving; harmonic-current mitigation; medium-voltage motor drive; power 15 kW; three-level PWM converter; three-phase diode rectifier; transformerless hybrid active filter; voltage 400 V; voltage 6.6 kV; voltage-balancing control; Active filters; harmonic mitigation; hybrid filters; motor drives; passive filters;
Conference_Titel :
Energy Conversion Congress and Exposition, 2009. ECCE 2009. IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4244-2893-9
Electronic_ISBN :
978-1-4244-2893-9
DOI :
10.1109/ECCE.2009.5315970