複数の電圧上昇対策を考慮した無効電力補償装置の費用対効果分析手法

抄録

The installed capacity of photovoltaic (PV) systems has been increasing rapidly due to the enforcement of the feed-in tariff scheme in Japan. However, reverse power flows from the roof-mounted PV systems cause voltage-rises in distribution networks. PV output can be separated into two fluctuation components, short-period and long-period. Long-period fluctuation is compensated by SVR (Step Voltage Regulator) with low response speed, and short-period fluctuation is stabilized by reactive power compensation with high response speed. As for the reactive power compensation, installing SVC (Static Var Compensator) in high-voltage lines has been studied. On the other hand, the idea of installing reactive power compensators in low-voltage lines has been proposed as a promising alternative. This paper proposes a method for analyzing the cost-effectiveness of the reactive power compensators, considering SVR and the constant power factor control of PCS (Power Conditioning System). The proposed method calculates the break-even cost of pole-mounted equipment to SVC, and analyzes the changes in the break-even cost under various power system conditions.