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Abstract-The Modular Multilevel Matrix Converter (M3C) is a Modular Multilevel Converter topology which is suitable for high power low speed drive applications. This paper presents a fully decoupled current control which allows an independent input, output and internal balancing current control. To equalize the energy stored in the nine converter arms, an energy and balancing control is presented which includes average, horizontal, vertical and diagonal balancing control loops. Simulation results are used to verify the function of the M3C together with an induction motor drive system. Additionally, the proper function of the recently constructed arm PCB working as single phase multilevel STATCOM is presented. This PCB will be used for each arm in the laboratory prototype of the M3C in the near future.

This paper presents a transformed arm power analysis of the Modular Multilevel Matrix Converter (M3C). It enables the energy balancing in the whole frequency range for high power variable-speed drive applications. Four balancing directions are identified for the active power exchange between the converter arms with minimal internal currents. At critical operating points a zero sequence voltage is used. Additionally, the reactive power components can be used to perform a real time calculation of the energy pulsation in all four balancing directions to improve the control performance. A low voltage prototype with 5 cells in each of the nine arms has been realized to verify the theoretical analysis.

Abstract-This paper presents a novel cascaded vector control scheme for the Modular Multilevel Matrix Converter (M3C). The inner current control loops allow an independent control of the input and output converter currents. The outer energy control consists of average, vertical and horizontal balancing control loops to equalize the energy stored in the nine converter arms. A modulation method to balance the energy stored in the cells of one converter arm and to generate the desired arm voltage by selecting the appropriate cells is presented. The proposed vector control scheme allows the qualitative operation of the converter even under unbalanced line conditions. The function of the new converter control is verified by simulations. Additionally, three coupled three-phase z-winding arm inductors L are presented for the use with the M3C.

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