基于全局快速终端滑模转速调节器的PMSM驱动系统模型预测电流控制

Model Predictive Current Control for PMSM Drive System Based on Global Fast Terminal Sliding Mode Speed Regulator

  • 摘要: 针对三相永磁同步电机(PMSM)的驱动系统,采用全局快速终端滑模(GFTSM)技术,提出了基于GFTSM转速调节器的模型预测电流控制(MPCC)策略.为了克服负载扰动及参数变化的影响、增强系统的鲁棒性,设计了基于GFTSM的转速调节器,并给出了其稳定性和鲁棒性的证明;为了减小定子电流脉动、提高系统控制精度,给出了系统MPCC设计方法.所设计的基于GFTSM转速调节器的MPCC能够使三相PMSM驱动系统可靠稳定运行,达到良好的转矩和转速控制效果.与基于PI转速调节器和基于常规滑模转速调节器的两个MPCC-PMSM系统相比,所提控制策略能使MPCC-PMSM系统不仅具有更好的控制性能、更强的鲁棒性,而且能够明显降低系统抖振、减小系统三相电流THD(total harmonic distortion)值.仿真结果验证了所提策略的正确性和有效性.

     

    Abstract: We develop a global fast terminal sliding mode (GFTSM)-based model predictive current control (MPCC) for a three-phase permanent magnet synchronous motor (PMSM) drive system. To overcome load disturbance and parameter variation, we design a GFTSM-based speed regulator, and prove its stability and robustness. To reduce stator current ripples and improve control accuracy, we present the MPCC method to select the optimal voltage vector of a voltage source inverter. The resultant GFTSM-based MPCC PMSM drive system not only runs reliably and steadily but also has a satisfactory control effect for its torque and speed. Compared with two MPCC PMSM drive systems, namely, the PI-based regulator and the conventional sliding mode-based regulator, the GFTSM-based regulator possesses better dynamical performance and stronger robustness, as well as weaker chattering and a smaller total harmonic distortion index of three-phase stator currents. Simulation results validate the feasibility and effectiveness of the proposed scheme.

     

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