MPPT制御の調整によるPVシステム出力平準化の経済性評価

概要

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We have proposed a method which can smooth a short-term change in PV systems output by suppressing a response of MPPT against a rapid insolation change. Because our proposed method does not convert insolation to electricity when insolation changes rapidly, it might increase energy conversion loss and decrease economy of a PV system. Comparative assessment on economics was made for two PV systems equipped with an output smoothing function, i.e. our proposed system adjusting MPPT and a battery system. By using the data on insolation for a year, we evaluated the energy conversion loss of PV system, which utilizes the proposed MPPT for smoothing the output. Then, taking into account the required capacity of battery, we compared the annual cost for smoothing PV systems output. The result suggests that the proposed method could be more economical relative to the smoothing method using a battery with future target cost.