Modified Deadbeat Predictive Current Control for PMSM Drive System via a Composite Integral Sliding Mode Observer

In consideration of promoting the control performance of permanent magnet synchronous motor (PMSM) with lump disturbance, a modified deadbeat predictive current control (DPCC) strategy via a composite integral sliding mode observer is proposed in this paper. First of all, the parametric dependence of the conventional DPCC method is analysed, which demonstates that the occurrence of parameter mismatch would lead to current prediction error. Afterwards, a modified lump disturbance suppressing proposal on the ground of integral sliding mode control (ISMC) theory is designed, which integrates the interference suppression part into the current control loop. Thus the drawbacks of conventional parallel exterior observer-based compensation methods have been averted. The convergence of the designed proposal is also certified. Moreover, an adaptive high-order integral sliding mode disturbance current observer (ISMDCO) is proposed to restrain the chattering in the ISMDCO caused by the signum function and further enhance the dynamic performance. Furthermore, a composite observer is constructed by incorporating the ISMDCO into the adaptive high-order ISMDCO through the designed weight function to reduce the starting current. Numerical simulation results validate the strong robustness and excellent dynamic performance of the proposed strategy.