The multivariable coal-fired power plants (CFPPs) are characterized by several interconnected nonlinear subsystems of varying time lags making the whole system stiff, and thereby attaining multitime-scale property. In this case, controls based on singular perturbation and time-scale theories provide superior results than conventional one. This brief aims to develop an integral state feedback controller with an observer using three-time-scale approach for CFPP. The integral action assures zero steady-state error, an observer determines states, and a three-time-scale technique provides flexibility to design independent subsystem controls. First, a state space model is obtained with state feedback integral action in three-time-scale form. Second, three-stage feedback control is proposed by an innovative two-time-scale separation so as to reduce design complexity and computations. Finally, an observer is constructed again by time-scale decoupling. It is then examined on the practical model of 300-MW CFPP for investigating plant behavior under various transients. In comparison, the performance of the suggested controller is found to be superior to a recently published controller.

中文翻译：

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燃煤电厂基于观测器的输出反馈积分控制：三时间尺度视角

多变量燃煤电厂（CFPP）的特点是几个相互连接的非线性子系统，这些子系统具有不同的时滞，从而使整个系统变得僵硬，从而获得了多时标性。在这种情况下，基于奇异摄动和时标理论的控制提供了比常规控制更好的结果。本简报旨在使用CFPP的三时标方法与观察者一起开发一种积分状态反馈控制器。积分作用可确保零稳态误差，观察者可确定状态，三时标技术为设计独立的子系统控制提供了灵活性。首先，以三级尺度的状态反馈积分作用获得状态空间模型。第二，通过创新的两级标度分离，提出了三级反馈控制，以减少设计复杂性和计算量。最后，通过时标去耦再次构造观察者。然后在300 MW CFPP的实用模型上进行了研究，以研究各种瞬态下的电厂行为。相比之下，发现建议的控制器的性能优于最近发布的控制器。