Hybrid control approach for fast switching MMCs

Abstract

This study presents a new hybrid control approach for different control and switching frequencies for converters of the modular multi-level converter (MMC) family. 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 in fixed-point arithmetic.

Keywords

• field programmable gate arrays
• digital signal processing chips
• floating point arithmetic
• fixed point arithmetic
• switching convertors
• different control
• switching frequencies
• converters
• modular multilevel converter family
• higher switching frequency
• output voltage update frequency
• MMC control frequency
• closed-control loop
• output voltages
• hybrid control approach