AC systems session summary

The sixth and final session of the Sixth Annual IEEE Power Electronics Specialists Conference consisted of four papers which illustrated well the breadth of concerns which engage engineers charged with the design of electronic power processing equipment. The first paper by L. L. Ogborn presents a new SCR inverter configuration which permits the injection of power from an auxiliary energy source, such as solar cells, into a standard 60 Hz utility system. The motivation for such a system is to avail one´s self of locally-available but less-dependable energy sources, thereby effecting economies and reducing the consumption of fossil fuels. The second paper by J. M. Hudak presents some ideas and electronic circuits that are useful in protecting electrical power systems from undesirable overload and under-load conditions. The third paper by T. J. Hart is concerned with the level of acoustic noise generated by molybdenum permalloy powder cores used in dc-to-dc converters applications. A model is presented for the magnetostrictive effects which are the principal contributor to the acoustic output. The fourth paper was in the form of a late-news oral presentation by D. F. Partridge on the evaluation of a series of new concepts and improved SCR commutation circuits. The latter paper is not included in the published proceedings.