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In Japan, PV as renewable energy source (RES) is expanding rapidly. However, if the PV penetration becomes too large, the regulation capability for maintaining the system frequency will be insufficient. Where such a problem arises, cross-area system operation that uses regulation capability of other systems through interconnection lines is being studied. This paper proposes the method of maintaining regulation capability by pumped-storage hydro in other electric power systems through changing the base tie line power flow.

Study on Cross-Area System Operation Utilizing Pumped-Storage Hydro with Bulk Penetration of PVs