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Analysis and design of a feed-forward-type active filter to eliminate common-mode voltage generated by a PWM inverter

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3 Author(s)
Jiang Yanshu ; Dept. of Electr. Eng., Harbin Inst. of Technol., China ; Xu Dianguo ; Chen Xiyou

An equivalent model of a four-winding transformer for a feed-forward-type active filter is presented in this paper and a three-phase inverter-fed motor drive system can he described as a single-phase system for the convenience of analysis. After a passive common-mode voltage detection method is analysed theoretically, a resistor-capacitor network is used to detect common-mode voltage generated by a PWM inverter; a push-pull circuit, in which the complementary transistors have no maximal rating voltage limitation, is used to amplify current for driving a four-winding transformer which is used to impose a compensating voltage with the same amplitude but with the opposite polarity to the common-mode voltage generated by the PWM inverter. Some design considerations of the filter are also given in detail. In a 380 V/3 kW motor drive system, simulation analysis and experimental results confirm the validity of the proposed filter that the common-mode voltage at motor terminal is eliminated almost completely and the negative effects of the common-mode voltage, such as shaft voltage and bearing current, are unobvious.

Published in:

IECON 02 [Industrial Electronics Society, IEEE 2002 28th Annual Conference of the]  (Volume:1 )

Date of Conference:

5-8 Nov. 2002