Development of controller for DC-module integrated converter using cascaded buck-boost converter

In this paper, the mode selection algorithm and the control flow chart are proposed for DC-module integrated converter (DC-MIC), which can be operated under mismatch problem of each PV module. In order to operate DC-MIC, a simple configuration control algorithm is proposed. This algorithm includes mode selection method to operate switch of cascaded buck-boost converter simply which has two kind of functioned switches. Based on the control algorithm, a system flowchart is also proposed. The validity of the proposed control algorithm and the flowchart are verified by experimental results based on 250W DC-MIC with grid connection inverter.