Mathias Schnarrenberger, Dennis Bräckle, Michael Braun

The 9th IET International Conference on Power Electronics, Machines and Drives (PEMD) 2018, Liverpool, UK

This paper presents a new hybrid control approach for different control and switching frequencies for converters of the Modular Multilevel Converter (MMC)-familiy. Using this concept it is possible to achieve a higher switching frequency and output voltage update frequency than the MMC control frequency. The closed control loop can be calculated on a digital signal processor in floating-point arithmetic. Only the resulting arm voltages and output voltages must be calculated with the switching frequency, e.g. on a field programmable gate array (FPGA) in fixed-point arithmetic.