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为了提高内置式永磁同步电机(IPMSM)直接转矩控制系统的动态品质及鲁棒性,使系统在暂态、稳态过程中具有更优良的特性,提出了将直接转矩控制与线性-滑模变结构控制相结合的策略,分别采用转矩、磁链线性(PI)-滑模控制器取代了传统直接转矩控制中的滞环或PI控制器,该控制器分别根据转矩、磁链给定量与反馈量的误差动态调节平衡增益,使其实现线性控制与滑模开关控制的平衡关系,满足系统的控制需求。理论分析及实验结果表明,这种控制策略可极大地减小了磁链及转矩脉动,增大了调速范围,同时仍保持直接转矩控制固有的转矩快速响应特征,在负载恒定或突变条件下系统具有快速跟踪、鲁棒性强的优点,有效改善了系统的动、静态运行性能。
In order to improve the dynamic quality and robustness of direct torque control system of an internal permanent magnet synchronous motor (IPMSM), the system has more excellent characteristics in the transient and steady state processes. The direct torque control and the linear- Sliding mode and variable structure control, the hysteresis loop or PI controller in traditional direct torque control is replaced by torque and flux-linkage linearity (PI) -linear sliding mode controller respectively. According to the torque, The flux of given amount and feedback error dynamically adjusts the balance gain so that it achieves the balance between linear control and sliding mode switch control to meet the control requirements of the system. Theoretical analysis and experimental results show that this control strategy can greatly reduce the flux linkage and torque ripple, increase the speed range, while still maintaining the inherent characteristics of the direct torque control torque response, the load constant or Under the condition of catastrophe, the system has the advantages of fast tracking and strong robustness, which effectively improves the dynamic and static performance of the system.