Capacitor dynamic voltage-sharing control method of modular multi-level matrix converter

The invention discloses a capacitance dynamic voltage-sharing control method for a modular multilevel matrix converter, and the method comprises the following steps: 1), obtaining a modulation ratio offset value dMxyn (x belongs to {u, v, w}, y belongs to {a, b, c}) of PWM modulation; 2) obtaining a modulation ratio offset final value dMxy (x belongs to {u, v, w}, y belongs to {a, b, c}) of PWM modulation between the sub-converters; and 3) obtaining a modulation wave signal and a triangular carrier signal of the modular multi-level matrix converter, obtaining a final modulation wave signal according to the modulation wave signal, dMxyn (x belongs to {u, v, w}, y belongs to {a, b, c}) and dMxy (x belongs to {u, v, w} and y belongs to {a, b, c}), subtracting the final modulation wave signal from the triangular carrier signal, obtaining a PWM signal of an actual switch of each full-bridge module in a bridge arm according to the subtracting result, and outputting the PWM signal. According to the PWM signal of the