多时变扰动下的PID控制性能评估

Performance assessment of PID control with multiple time-varying disturbance

时变扰动是影响控制系统性能的主要因素之一。针对存在多个时变扰动的情况,提出了一种基于多模型加权的PID最小可达方差控制性能评估方法。首先,根据每个扰动的特性设计子PID最小可达方差控制器;然后,基于扰动作用时间构造权重以设计多模型加权控制器,再以此控制器作用下系统输出所能达到的最小方差作为基准评估PID控制系统的性能。最后,通过仿真实例验证所提方法的有效性。

Time-varying disturbance is one of the main factors affecting the performance of the control system.For the case of multiple time-varying disturbances,a PID achievable minimum variance performance assessment method based on multi-model weighted is proposed.First,a PID achievable minimum variance controller is designed based on the characteristics of each disturbance.Then,multiple controllers are weighted based on the disturbance time and the achievable minimum variance of the system output under the weighted controller is used as a benchmark for performance assessment.Finally,the effectiveness of the proposed method is verified by simulation examples.