PV出力のリアルタイムデータに応じたLFC調整力の確保手法

抄録

When supply-and-demand imbalance occurs due to load fluctuation or output fluctuation of variable renewable energy sources like photovoltaic power generation (PV) in power system, frequency fluctuation occurs. The fluctuation component from a few minutes to 20 minutes period is absorbed by the load frequency control (LFC). When the PV output fluctuation is large, static LFC reserve (e.g. 2% of system capacity) in the conventional operation may be insufficient. If more LFC resereve is secured, the frequency fluctuation may decrease. However, increasing LFC reserve leads to increasing fuel cost because of the output deviation from the most economical operation determined by economic load dispatch. In this paper, a method for securing LFC reserve by using real-time PV output data is proposed. The proposed method decreases LFC reserve in case of the small output fluctuation, while increases LFC reserve in case of the large output fluctuation. The proposed method can solve two problems (i. frequency fluctuation due to LFC reserve shortage, ii. fuel cost increase due to LFC reserve excess) which conventional method (the ratio of LFC reserve to system capacity is constant) cannot solve. With evaluation using IEEJ AGC30 model for automatic generation control analysis, it was shown that the proposed method could decrease the fuel cost compared to the conventional method.