Stability conditions for multi-converter power systems

The development of power electronic system has brought the application of solid-state power converters in a variety of new fields of application. For example, the number of power converter varies from a few converters in a conventional car to hundreds in a international space station. A multi-converter power system is composed by the presence of different solid-state power converters integrated together in order to form an interconnected system, generally very complex. In this work stability conditions are investigated, starting at first from a conventional mathematical model derived using state-space averaging method. Preliminary experimental tests, however, proved the importance of parasitic parameters on the stability of the whole system. A more complete model that takes into account real parameters is then introduced, in order to obtain more precise predictions on critical load values. Final experimental test verified the validity of the model and the accordance with predictions.