Power cables models with frequency dependent parameters

The fast commutation of the modern power semi-conductor devices is the main source of the conducted and radiated emissions generated by the power converters. These devices produce high voltage variations (dv/dt) which excite stray elements of the power circuit and induce high frequency parasitical currents that use the energy cables to be propagated in the whole of the system. In order to study the influence of the power cable characteristics on the level of the conducted emissions, it is necessary to elaborate a precise model of the energy cables, taking into account various phenomena that appear when the frequency increases. This paper proposes a high frequency modelling method of energy cable that takes into account the skin and proximity effects and dielectric losses. The proposed method is applied to the 3-wire unshielded cable and extended to the 4-wire shielded cable. The proposed models are validated in the frequency and time domains. Copyright (C) 2007 Praise Worthy Prize S.r.l. - All rights reserved.