A sorting balance control for battery sources in a single phase multilevel inverter

The reconfigurable battery array (RBA) can generate different levels of dc voltage for the single phase multilevel inverter (MLI). However, it implies that each battery module inside the RBA will provide different level of energy for the output load. In this paper, single voltage sensing balance (SVSB) method is proposed to equalize the battery modules voltage of the RBA. The proposed SVSB method only need a voltage sensor to accomplish the battery module equalization. The circuit structure and operational principle of the MLI with the RBA are introduced in this paper. The control strategy of the proposed SVSB method will be illustrated. Finally, the computer simulation and hardware experimental results of a 4-level prototype MLI are given to verify the performance of the proposed SVSB method.