A Novel Finite-Set Sliding-Mode Model-Free Predictive Current Control for PMSM Drives Without DC-Link Voltage Sensor

Abstract

Model predictive control (MPC) has attracted a lot of attention for power converters and motor drives in the last decade, owing to its merits such as explicit concept, excellent dynamic performance, and decent applicability in digital implementation. However, as a model-based method, classical MPC is heavily dependent on the system parameters of the plant under control. In this article, a novel finite-set sliding-mode model-free predictive current control (FS-SM-MFPCC) is proposed for permanent magnet synchronous machine (PMSM) drives, which combines the theory of sliding-mode control with MPC. The proposed strategy is thoroughly model-free, irrelevant for the dc-link voltage, and computationally light. The original version of the suggested strategy suffers from two flaws: 1) poor steady-state performance and 2) existent tracking errors, which are solved by using a simple correction algorithm and an extended control set coordinating with an improved cost function, respectively. The comparatively experimental results based on a 500-W PMSM drive are given to confirm the benefits of the proposed strategy.