Estimation of multiphase currents using DC bus current and switching state

Abstract

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