Mudi Rajani K, Dey Chanchal, Lee Tsu-Tian
Department of Instrumentation and Electronics Engineering, Jadavpur University, Sector III, Block LB/8, Salt-lake, Calcutta 700098, India.
ISA Trans. 2008 Jan;47(1):45-52. doi: 10.1016/j.isatra.2007.07.002. Epub 2007 Sep 12.
Ziegler-Nichols tuned PI and PID controllers are usually found to provide poor performances for high-order and nonlinear systems. In this study, an improved auto-tuning scheme is presented for Ziegler-Nichols tuned PI controllers (ZNPICs). With a view to improving the transient response, the proportional and integral gains of the proposed controller are continuously modified based on the current process trend. The proposed controller is tested for a number of high-order linear and nonlinear dead-time processes under both set-point change and load disturbance. It exhibits significantly improved performance compared to ZNPIC, and Refined Ziegler-Nichols tuned PI controller (RZNPIC). Robustness of the proposed scheme is established by varying the controller parameters as well as the dead-time of the process under control.
通常发现，齐格勒-尼科尔斯整定的PI和PID控制器对于高阶和非线性系统的性能较差。在本研究中，针对齐格勒-尼科尔斯整定的PI控制器（ZNPIC）提出了一种改进的自整定方案。为了改善瞬态响应，基于当前的过程趋势不断修改所提出控制器的比例增益和积分增益。在所提出的控制器在设定值变化和负载扰动下对多个高阶线性和非线性时滞过程进行了测试。与ZNPIC和改进的齐格勒-尼科尔斯整定的PI控制器（RZNPIC）相比，它表现出显著改善的性能。通过改变控制器参数以及受控过程的时滞来确定所提出方案的鲁棒性。
