Research on the Amplitude Coefficient for Multilevel Matrix Converter Space Vector Modulation

This paper presents an improved space vector modulation (SVM) using amplitude coefficient on a capacitor-clamped multilevel matrix converter (MMC). The MMC utilizes a multilevel structure on a conventional matrix converter, which allows direct ac-ac power conversion without large energy store elements. This structure features, in high-voltage application, staircase out- put voltage with less voltage step, better harmonic issue, and compact design. In this paper, the MMC structure and the relative SVM is first introduced. Furthermore, the improved modulation strategy based on amplitude coefficient is employed to improve the MMC performance in terms of modulation precision. The theoretical analysis of the amplitude coefficient is discussed in detail. A comparison between the traditional SVM and the improved SVM is given to demonstrate the theoretical findings. Results from SABER simulation and experimental prototype are presented to validate the method.