Department of E&I, St Joseph's College of Engg, IT Highway, Chennai-600119, India.
ISA Trans. 2012 Jul;51(4):514-21. doi: 10.1016/j.isatra.2012.03.003. Epub 2012 Apr 9.
A PID controller is widely used to control industrial processes that are mostly open loop stable or unstable. Selection of proper feedback structure and controller tuning helps to improve the performance of the loop. In this paper a double-feedback loop/method is used to achieve stability and better performance of the process. The internal feedback is used for stabilizing the process and the outer loop is used for good setpoint tracking. An internal model controller (IMC) based PID method is used for tuning the outer loop controller. Autotuning based on relay feedback or the Ziegler-Nichols method can be used for tuning an inner loop controller. A tuning parameter (λ) that is used to tune IMC-PID is used as a time constant of a setpoint filter that is used for reducing the peak overshoot. The method has been tested successfully on many low order processes.
比例-积分-微分（PID）控制器被广泛应用于控制工业过程，这些过程大多是开环稳定或不稳定的。选择合适的反馈结构和控制器调优有助于提高回路的性能。在本文中，使用双反馈回路/方法来实现过程的稳定性和更好的性能。内部反馈用于稳定过程，外部回路用于良好的设定点跟踪。基于内模控制器（IMC）的 PID 方法用于整定外环控制器。基于继电反馈或齐格勒-尼科尔斯方法的自动整定可用于整定内环控制器。用于整定 IMC-PID 的整定参数（λ）用作设定点滤波器的时间常数，用于减少过冲峰值。该方法已在许多低阶过程中成功测试。
