An all‐proportional‐derivative (PD) control‐based modified Smith predictor design is reported here for second‐order delay‐dominated integrating processes. The proposed control structure is realized with two PD controllers along with a first‐order filter towards achieving the desired closed‐loop response. To eliminate the tuning complexity, reported internal model control (IMC) scheme suggests a single tuning parameter λ (i.e. closed‐loop time constant) to tune both the PD controllers along with the filter present in the modified Smith predictor designing. The forward path PD controller parameters are obtained as per the IMC tuning guideline suggested for servo tracking, whereas the feedback path PD controller is realized based on Routh stability analysis with a goal towards improved regulatory responses. The first‐order filter present in the feedback path helps to ensure robust closed‐loop performance. Considerable performance enhancement is observed during set point tracking by the proposed scheme where no overshoot is observed even with smaller rise time. In addition, smooth and reasonably quick load rejection behaviour is also found during a regulatory response. Superiority of the proposed scheme is also substantiated in comparison with others' reported dead‐time compensating techniques in terms of closed‐loop performance indices as well as stability margins.

中文翻译：

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修改后的基于Smith预估因子的全比例微分控制，用于二阶时延主导的积分过程

在此报告了一种基于全比例微分（PD）控制的改进Smith预估器设计，用于二阶时延主导的积分过程。所提出的控制结构是通过两个PD控制器和一阶滤波器实现的，以实现所需的闭环响应。为了消除调整的复杂性，报告的内部模型控制（IMC）方案建议使用单个调整参数λ（即闭环时间常数）来对两个PD控制器以及改进的Smith预估器设计中存在的滤波器进行调整。前向路径PD控制器参数是根据建议用于伺服跟踪的IMC调整指南获得的，而反馈路径PD控制器是基于Routh稳定性分析实现的，目的是改善监管响应。反馈路径中存在的一阶滤波器有助于确保强大的闭环性能。所提出的方案在设定点跟踪期间观察到了相当大的性能增强，其中即使上升时间更短也未观察到过冲。此外，在监管响应期间还发现了平稳，合理的快速甩负荷行为。在闭环性能指标以及稳定性裕度方面，与其他人报道的空载时间补偿技术相比，该方案的优越性也得到了证实。在监管响应期间，还发现了平稳而合理的快速甩负荷行为。在闭环性能指标和稳定性裕度方面，与其他人报道的空载时间补偿技术相比，该方案的优越性也得到了证实。在监管响应期间，还发现了平稳而合理的快速甩负荷行为。在闭环性能指标和稳定性裕度方面，与其他人报道的空载时间补偿技术相比，该方案的优越性也得到了证实。