Multisampling Robust Predictive Current Control for High Speed Permanent Magnet Synchronous Motor

The predictive current control (PCC) system of permanent magnet synchronous motor (PMSM) has the advantages of fast dynamic response and easy digital realization. However, when the speed of the PMSM is high, the carrier wave ratio of the inverter is low. The discrete model derived from the forward Euler method commonly used in traditional methods has large model error. As a result, it is difficult to control the d-axis and q-axis currents to follow their given values precisely. In this paper, an improved PCC method for the high-speed PMSM with a low carrier wave ratio is adopted, which is composed of a discrete model considering the change of rotor position within one sampling period and a multi-sampling robust PCC strategy. Multi-sampling robust PCC enhances the robustness of the controller to the model error and the parameter mismatch. Through the simulation on MATLAB/Simulink platform, it is proved that the PCC strategy can make the current of high-speed PMSM follow the given value well, reduce the harmonic content of the current, and has good robustness to the parameter mismatch.