Electric-power-supply systems for coexistence of power- Distribution systems and distributed resources

OVERVIEW: As a result of the increased concern for environmental issues and system improvement, distributed resources utilizing renewable energy are being introduced. In the case that multiple distributed resources are connected to a power system, the influence of such connection on power quality and supply reliability is a cause of much concern. Accordingly, it is hoped that new power-supply systems that combine implementation expansion of distributd resources and stable operation of power systems will be established. Hitachi is continuing technical development that will contribute to realizing next-generation power-supply systems aimed at achieving coexistence of power systems and distributed resources. Aiming at power systems, in collaboration with the Central Research Institute of Electric Power Industry (CRIEPI), we are grappling with development of a supervision and control system for power-distribution systems, and we have developed such a system for use in demonstrative project of New Energy and Industrial Technology Development Organization (NEDO). Furthermore, as for microgrids - which are drawing much attention as an implemented form of distributed resources - we are developing a system with functions such as operation scheduling, demand and supply control, and power-quality monitoring. In addition, a request was received from NTT FACILITIES INC. for such a system, so a system for use at NEDO's demonstrative project was developed and constructed.