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Voltage balancing control for a three-level diode-clamped converter in a medium-voltage transformerless hybrid active filter
- Source :
- IEEE Transactions on Power Electronics. March-April, 2009, Vol. 24 Issue 3-4, p571, 9 p.
- Publication Year :
- 2009
-
Abstract
- This paper discusses a transformerless hybrid active filter integrated into the 6.6-kV, 1-MW adjustable-speed motor drive having a three-phase diode rectifier at the front end. The hybrid filter consists of an active filter using a three-level diode-clamped pulsewidth modulator converter rated at 60 kVA, and a 250-kVA passive filter tuned to the seventh harmonic frequency. They are directly connected in series without a transformer. This circuit configuration enables one to use 1.2-kV insulated gate bipolar transistors because the dc voltage of the three-level converter is 1.32 kV (20 % of 6.6 kV). Voltage balancing control characterized by superimposing a sixth harmonic zero-sequence voltage on the active filter voltage reference in each phase is introduced to the three-level converter with triangle carrier modulation. Experimental waveforms obtained from a 400-V, 15-kW downscaled system verify the viability and effectiveness of the proposed hybrid filter, keeping the two dc capacitor voltages well-balanced. Index Terms--Active filters, diode rectifiers, harmonics, hybrid filters, passive filters, three-level converters.
- Subjects :
- Electric current converters -- Design and construction
Electric current rectifiers -- Design and construction
Rectifier instruments -- Design and construction
Electric filters -- Design and construction
Voltage -- Measurement
Voltage -- Control
Electric current converter
Business
Electronics
Electronics and electrical industries
Subjects
Details
- Language :
- English
- ISSN :
- 08858993
- Volume :
- 24
- Issue :
- 3-4
- Database :
- Gale General OneFile
- Journal :
- IEEE Transactions on Power Electronics
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.198805119