多相チョッパの共通DCバス電流とスイッチング状態を用いた各相リアクトル電流復元方式の提案

抄録

The voltage of solar cell strings can be controlled in residential photovoltaic systems using a multi-phase convertor. How-ever, multi-phase convertors require a few current sensors. The authors examined how to reduce the current sensor for each phase of a multi-phase convertor. This paper presents the analysis of a multi-phase convertor based on DC bus current, phase currents, and switching state, and it proposes an estimation method for multi-phase currents. The estimation method can be implemented with constant sampling frequency. Experimental results demonstrate the validity of the estimation method of multi-phase currents for current-controlled three-phase convertor.