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PID(比例积分微分)控制由于算法简单实用。长期以来深受工程界的欢迎,其在工程上的应用非常普遍。尤其是比例积分控制(PI)和比例积分微分控制(PID),这两种控制器都引入了积分作用来消除系统稳态误差。而在实际的控制过程中,由于积分参数的设置不合理,或者由于硬件执行机构出现故障等都会使得偏差长时间无法消除,从而产生积分饱和现象,导致控制过程不稳定。因此,如何防止积分饱和,保证控制过程稳定和及时是DCS(分散控制系统)系统工程师和工艺工程师在组态过程中必须考虑的问题。本文将着重讨论积分饱和产生的原因以及在DCS组态过程中容易产生积分饱和的回路和常用的解决方法。
PID (Proportional Integral Derivative) control because the algorithm is simple and practical. Has long been welcomed by the engineering community, its application in engineering is very common. In particular, proportional integral control (PI) and proportional integral derivative control (PID), both controllers introduce integral action to eliminate the system steady-state error. However, in the actual control process, due to the unreasonable setting of the integral parameter or the failure of the hardware actuator, the deviation can not be eliminated for a long time, resulting in the phenomenon of integral saturation and the instability of the control process. Therefore, how to prevent the integrals from being saturated, to ensure that the control process is stable and timely is a must for DCS (distributed control system) system engineers and process engineers in the configuration process. This article will focus on the causes of integral saturation and easy to produce integral saturation loop and common solutions in DCS configuration process.