Modified Smith predictor (MSP) with P (proportional)-PD (proportional-derivative) control methodology is designed for pure integrating processes with time delay (IPTD). Industrial processes such as liquid supply to the large storage, fractional distillation, and superheated steam flow to turbine are found to be integrating in nature with dominant time delay. The proposed P-PD control strategy ascertains the desired closed loop response. The closed loop time constant () is considered to be the sole tuning parameter for reducing the tuning intricacies of the proposed MSP-based design. P controller in the forward path is tuned by the internal model control (IMC) technique towards enhanced servo tracking. In the feedback path, PD controller parameters are obtained from Routh's stability analysis for improving regulatory responses. Overshoot free set point response is observed and smooth as well as reasonably faster recovery is also found during load fluctuations. Effectiveness of the proposed MSP is validated during closed loop performance and stability analyses in comparison to others' reported dead time compensating methodologies.

中文翻译：

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用于纯积分延迟主导过程的基于修正 Smith 预测器的 P-PD 控制

采用 P（比例）-PD（比例-导数）控制方法的修正 Smith 预测器 (MSP) 专为具有时间延迟 (IPTD) 的纯积分过程而设计。工业过程，例如向大型储存器供应液体、分馏和流向涡轮机的过热蒸汽，被发现在本质上与主要的时间延迟相结合。所提出的 P-PD 控制策略确定了所需的闭环响应。闭环时间常数 () 被认为是减少所提出的基于 MSP 设计的调整复杂性的唯一调整参数。正向路径中的 P 控制器通过内部模型控制 (IMC) 技术进行调整，以增强伺服跟踪。在反馈路径中，PD 控制器参数是从 Routh 的稳定性分析中获得的，用于改进调节响应。观察到无过冲设定点响应，并且在负载波动期间还发现了平滑且相当快的恢复。与其他报告的死区时间补偿方法相比，在闭环性能和稳定性分析期间验证了提议的 MSP 的有效性。