| Abstract |
High power converters can be constructed by paralleling N interleaved converters via InterphaseTransformers (ITRs) to produce multilevel output voltages while minimizing circulating currents amongconverters. With the ITRs connected in cyclical cascade topology, the ITR voltage stress is highlydependent on number of parallel converters and phase shifts between Pulse Width Modulation (PWM)triangular carriers. To analyse the ITR system performance a model of cross-coupling produced by ITRsis needed to establish links between the converter voltages and ITR voltages and cross currentscirculating among converters. The main goal of this paper is to give a comprehensive overview of amodel of the system based on the ITR cyclical cascade topology which can be used for estimation of itsperformance. Based on this model, opportunities for minimisation of the ITR voltages and core losses,via optimization of the converter PWM carrier shifts, are identified and discussed. Application of thetheoretical results is illustrated in an example case with N=5 converters. |
