| This paper aims to present some problems concerning the electric power management systems of aircraft. In the first sections are presented some converters topologies used on aircraft, principles and digital control schemes for these converters. In the next sections there are presented architecture principles of power management systems using these kinds of converters. Converters are mainly used to adapt the power parameters of the on board sources to the aircraft consumers necessities. On More Electric Aircraft, with VSVF generators, these converters are used to feed the aircraft power buses, each consumer being coupled to the corresponding power bus. Taking into account the great importance of some consumers, it is necessary to ensure its feeding even a part of the on board power sources fails. In this purpose one use by one hand redundant power buses and by other hand the electric power management systems. These systems ensure both the coupling of the power sources to the power buses according to the power necessities and also commute the consumers feeding between the buses using different control strategies. The control strategies consider the available power sources at a time, the consumers it has to be fed and priority order of the consumers. |
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