This paper presents the design, development and testing of a 30kW, 200V/900V modular multilevel converter (MMC) based DC/DC converter prototype. An internal LCL circuit is used to provide voltage stepping and fault tolerance property. The converter comprises two five level MMC based on insulated gate bipolar transistors (IGBTs) and metal oxide semiconductor field effect transistor (MOSFET). Due to low number of levels, selective harmonic elimination modulation (SHE) is used, which determines the switching angles in such a way that third harmonic is minimized whereas the fundamental component is a linear function of the modulation index. In addition, instead of using an expensive control board, three commercial control boards are embedded. This is required to implement the sophisticated DC/DC converter control algorithm. Simulation and experimental results are presented to demonstrate the converter performance in step up and down modes.
|Title of host publication||8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)|
|Publisher||Institution of Engineering and Technology (IET)|
|Publication status||Published - 10 Nov 2016|
- DC/DC Converter, DC fault, Modular Multilevel Converter (MMC), DC grids, Selective Harmonic Elimination.