再生可能エネルギー大量導入の下での系統慣性の低下と対策の解析・評価

抄録

The massive deployment of PV and wind, which provides decarbonized energy supply, bring about various additional challenges, among those, the reduction of operational capacity of synchronous machines in a power system have been affecting stable operation of a power system. With the reduced system inertia, the system frequency deviates faster and more largely and the deviation sometimes results in instability of a power system operation. In this paper, we present the trend of system inertial reduction from 2030 to 2040 in Japan and quantify the cost increase when criteria of system inertia are applied. We further present the benefit of a PV PCS which can supply system inertia in terms of an improved system inertia profile and a reduction of annual operational cost in order to evaluate a strategy to maintain a system inertia.