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| Cascade Mode Three-Level AC Chopper |
| Li Lei, Tang Dongcai |
| Nanjing University of Science & Technology Nanjing 210094 China |
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Abstract Three-level (TL) AC switch unit is produced by two-level AC switch unit connected together in series manner. TL AC converter is produced by applying TL AC switch unit in basic converter. By combining Buck mode TL and Boost mode AC converters, a novel cascade mode AC chopper was proposed. The AC chopper can chopper unsteady high AC voltage with distortion into regulated sinusoidal voltage with low THD. The AC chopper, which is suit for high input voltage fields, has such following fetures as less power stages, bi-directional power flow, lower voltage stress in the front stage, low THD of output voltage, Buck and Boost mode conversion, unchanged voltage stress in the back stage. The operation principle was also investigated. For cascade mode TL AC chopper, control strategy of flying capacitor voltage was also presented. The AC chopper and the control strategy are fully proved by experimental results.
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Received: 19 October 2010
Published: 20 March 2014
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2012, Vol. 27 
