A Novel Robust Dead-Beat Structure for Double Vector Model Predictive Control in Three-Level Inverter fed PMSM Drives

Abstract

<p>Model predictive control (MPC) has recently been considered in permanent magnet synchronous motor (PMSM) drives due to its rapid dynamics and simple structure. However, conventional MPC utilizes only a single voltage vector per control cycle, and the prediction model relies heavily on the motor parameters. Hence, substantial current ripples and poor disturbance rejection have largely limited its adaptability to a variety of environment conditions. This paper presents a novel double vector MPC (DV-MPC) scheme for three-level inverter fed PMSM drives. To reduce the computational complexity of DV-MPC, the cost function is derived with the reference voltage by employing the dead-beat approach, and the inverter's neutral point potential is balanced using the complementary small voltage vectors. The dead-beat voltage prediction model is further enhanced by incorporating an active damping framework and an extra coefficient to enhance the robustness against parameter variations and disturbance rejection. Moreover, a robust current predictor is designed for the delay compensation. The proposed method is straightforward to implement, and achieves strong disturbance rejection and parameter robustness with a fast dynamic response. Experimental results demonstrate the effectiveness of the proposed method.</p>