基于模型预测变结构控制交流伺服系统

AC servo system based on model algorithmic with variable structure control

针对交流位置伺服系统存在的结构复杂及系统性能受不确定性影响严重等缺点,将模型算法控制与变结构控制结合,提出了一种新的预测变结构控制策略。该方法采用交流伺服系统的一阶ARMA模型作为预测控制的参数模型、在线实时反馈校正,利用变结构的思想求控制量,有效克服了不确定性的影响,而且控制算法简易,很好地满足了动态较快的电动机实时性要求。实验结果表明,采用本文提出的控制策略的交流伺服系统,能很好地克服非确定性的影响,且具有很高的静态精度和良好的动态跟踪性能。

The conventional AC servo system has many drawbacks, such as the complicated structure and the performance significantly influenced by various uncertainties, etc. To overcome these, a novel model algorithmic combined with variable structure control is proposed. A first-order ARMA model of the servo system is used as the parameter-model in the predicative control. To overcome various uncertainties, control is acquired by variable structure theories, and feedback tuning in real time on-line. Experimental results verify that the system exhibits good static and dynamic performance and isn' t influenced by various uncertainties.