永磁同步电机的趋近律滑模控制

PMSM Sliding Mode Control Based on Reaching Law

传统的交流伺服系统中速度环主要应用PI控制方式,虽然控制结构简单,可靠性强,但这种方法极易受到电机参数变化的影响,因此抗负载扰动能力差,鲁棒性不强。滑模变结构控制成功地克服了PI控制的上述缺陷,它通过不断改变系统的结构,使系统状态对负载扰动和电机参数的变化不再敏感,从而大大提升了系统的鲁棒性,有望被广泛应用于高性能的伺服系统中。采用id=0的矢量控制方案,在此基础上设计了指数趋近律的滑模控制,并用此方案替换了速度环常用的PI控制方案。最后利用仿真验证了此策略的可行性和优越性。

The traditional speed loop of the AC servo system mainly using PI control method. Even the control structure has many advantages such as simple control structure and high reliability,and it makes the system vulnerable to the volatile motor parameters and load disturbances. Sliding mode control can successfully overcome the above-mentioned defects of PI control method. By changing the system＇s structure constantly,sliding mode control makes the system insensitive to the load disturbances and changeable motor parameters,thus enhancing the robustness of the system. Therefore,it is expected to be widely used in high-performance servo systems. The id= 0 control method was adopted in this paper and a reaching law sliding mode controller was designed on this basis. Then the PI control method frequently applied in speed loop was replaced by this controller. The feasibility and superiority were tested through simulation results in the end.