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| A Novel Modulation Method for Fast Balancing DC-Link Capacitor Voltages of Cascaded H-Bridge Rectifier |
| Wang Cong, Zhang Guopeng, Wang Jun, Cai Yingying |
| School of Mechanical Electronic & Information Engineering, China University of Mining and Technology (Beijing) Beijing 100083 China |
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Abstract Based on the analysis to the structure and features of the cascaded H-Bridge (CHB) rectifier(CHBR) stage of transformerless high power converters, the concept of making CHBR working on optimum point and the corresponding novel modulation method are proposed by this paper. The optimum working point in safety operation area is firstly discussed, and then the principle of fast balancing DC-link capacitor voltages for each cell of CHBR with the novel modulation method is explained in detail, and the quantitative description for the allowed maximum unbalanced loads is also presented. Moreover, the implementation of the proposed novel modulation method which chooses two different modulation curves based on two-dimensional modulation by signs between AC-side output voltage and inductance current is illustrated as well. Finally, experiment results from the prototype test are given, which verified the validity of the proposed novel modulation method.
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Received: 15 September 2012
Published: 25 March 2014
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2013, Vol. 28 
