Abstract
A control scheme using space vector modulation for the modular multilevel matrix converter (MMMxC) without circulating current control is investigated. The circulating current flows spontaneously among all the nine arms to balance capacitor voltage of cells. A small arm inductor is inserted into each arm to suppress the di/dt and peak value of transient arm current at the moment of switching the cells. This control scheme enables the MMMxC to operate stably over a wide frequency range without any additional controls. Simulation and experiments were conducted using a 2-kW 7-level modular matrix converter and stable operations under various conditions, which are low frequency conversion (5 Hz to 60 Hz) and close input and output frequency conversion (60 Hz to 60 Hz), as well as 50 Hz to 60 Hz conversion, were demonstrated. In addition, the circulating current under these operations and suppression of the transient arm current by the arm inductors are investigated.
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