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Analysis and design of a three-level PWM converter system for railway-traction applications

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2 Author(s)
J. Shen ; GEC Alsthom Traction Ltd., Preston, UK ; N. Butterworth

The paper analyses the merits and demerits of three-level PWM converters through the comparison with two-level PWM converters. A general method for analysing the switching modes of PWM converters is described and an analysis of the three-level PWM converter is presented as an example. A neutral-point voltage-balance-control algorithm together with its hardware and software implementation is presented. A three-step methodology of rapid prototyping by using CAD for the system design, using a real-time simulator for checking the implementation and using high-power testing for validating the system, is described

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IEE Proceedings - Electric Power Applications  (Volume:144 ,  Issue: 5 )