Control method of three-phase six-bridge arm modular multilevel converter

The invention discloses a control method for a three-phase six-bridge-arm modular multilevel matrix converter, and the method comprises the following steps: building a mathematical model and a bridge arm sub-module capacitor voltage mean equation based on the Kirchhoff's law according to a circuit topological structure; simplifying the mathematical model and the bridge arm sub-module capacitor voltage mean value equation, and establishing a state space model through coordinate transformation; calculating an input side current reference value, a ring current reference value, a bridge arm sub-module capacitor voltage reference value and a bridge arm conduction module number reference value of the reference state space model; and obtaining an error state space model according to the actual state space model and the reference state space model, and designing a controller based on the error state space model. The stability of the system corresponding to the control method can be proved through the Lyapunov stabili