Passive Sliding Mode Control Strategy for Modular Multilevel Matrix Converters

Modular Multilevel Matrix Converters (M3C) are applicable for high voltage and high-power occasion. When the linear proportional-integral (PI) control in double-αβ coordinate system is used, the controlled quantities are still AC quantities, which need to be regulated by many parameters and have high harmonic content, and when the nonlinear passivity-based control (PBC) in double-dq coordinate system is used, all the controlled quantities are converted into direct flow, and the control structure is simpler. To address the issue that passive control is difficult to ensure a good dynamic response of the system, this paper provides a passive sliding-mode control policy based on M3C, which applies the passive controller based on Euler-Lagrange (EL) model to the internal loop current management, and then introduces the sliding-mode control (SMC) to availably address the issue that the passive control is too dependent on the direct current, and the control structure is relatively simple. effectively address the issue that passive control is too dependent on system parameters, making the control system have stronger anti-interference ability and dynamic response ability.