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Presented are reports on the development of a multiple power quality level supply system that provides five kinds of high quality electric power at the same time. The system utilizes both renewable energy and utility and supplies consumers with various kinds of electric power of high quality. It gives consumers the advantages of low cost and reduces the amount of space needed for existing such power converters as UPSs. It also contributes to promoting the introduction of renewable energy. We conducted a field experiment of this system. Over the course of one year, we measured the demand pattern of an experimental field. We then developed a system that was suitable for it. Furthermore, the effects will be studied for about one year and half demonstration by the field
Hirose et al. (Fri,) studied this question.