Extension Topologies for Modular Multilevel Series/Parallel Converter With Switched-Inductor Energy Transfer Between Modules

摘要

This paper presents three extension topologies for the modular multilevel series/parallel converter (MMSPC) with intermodule switched-inductor power transfer. The switched-inductor voltage conversion feature allows controllable and efficient transfer of energy between modules with nonnegligible voltage difference, providing both step-down and step-up functionalities. Thus, this converter can accurately control and rapidly adjust the voltage of each module to generate an ac output voltage waveform with a controllable number of levels, increasing the quality of the output. In this paper, is presented three novel configurations, in order to increase the flexibility and number of output voltage levels to the standard MMSPC with intermodule switched-inductor power transfer topology.