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Dual 18-pulse rectifier for high-power multilevel inverters

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2 Author(s)
Z. Cheng ; Dept. of Electr. & Comput. Eng., Ryerson Univ., Toronto, Ont., Canada ; B. Wu

This paper presents a new rectifier topology that uses 18-pulse transformers to achieve 36-pulse harmonic cancellation. The proposed rectifier can be used to reduce the input current harmonics for several multilevel inverters, such as 3-level neutral point clamped (NPC), 5-level cascaded H-bridge (CHB) and 5-level NPC/H-bridge inverters. It can also be used to neutralize harmonics between two 18-pulse drives. Compared to conventional multi-pulse topologies, it uses less secondary windings and simpler transformers to achieve better current THD. Fourier analysis shows that the topology is able to achieve 36-pulse harmonic cancellation. It also provides additional harmonic cancellation for the 5th and 7th harmonics for non-ideal transformers or between two drives. The simulated current waveforms, current spectra and DC bus voltages are given to confirm the theoretical analysis. Experiments are performed to verify the performance.

Published in:

31st Annual Conference of IEEE Industrial Electronics Society, 2005. IECON 2005.

Date of Conference:

6-10 Nov. 2005