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首页> 外文期刊>Arabian Journal for Science and Engineering >Optimal PI and PID Temperature Controls for a Dehydration Process
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Optimal PI and PID Temperature Controls for a Dehydration Process

机译：脱水过程的最佳PI和PID温度控制

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摘要

In this work, the drying air temperature for an experimental platform of sliced tomatoes dehydration is optimally regulated by using the very well-known integral control approach which could be equivalent to the PI control when the output system is the whole state. In a first stage, the chosen controller is a PI because the plant step response does not present oscillations with low damping. However, obtained experimental results, applying this controller, present some oscillations in the closed-loop transient response. So, in a second stage, a discrete PID controller is applied and its gains are computed by using a numerical optimization algorithm based on the hill climbing method, which considers a quadratic performance index; the proposed procedure assumes an input delayed discrete model of the plant; therefore, the stability is verified by the closed-loop poles location. The reason to apply an optimal control strategy is motivated by the energy saving and the preserving of a desired closed-loop performance of the process. In order to contrast the advantages to use an optimal controller, the obtained experimental results are compared with a PID controller tuned with the improved Ziegler-Nichols rules, which is optimized only considering a criterion depending on the error (the energy consumption it is not involved). Moreover, the performance given by optimal PI control is also compared with an optimal state feedback control. The synthesized controllers (computed gains) are programmed in an industrial programmable logic controller Siemens S7-1200, and they are applied to a sliced tomato dehydration plant. According to the obtained results, when the optimally tuned PID controller is applied, it produces energy saving rates, more uniform drying conditions for the product and a better closed-loop plant performance (shorter settling time and nonovershoot, which are desired features in this type of process), with respect to other tested controllers. The presented experimental results by using the PI and PID optimized controllers allow to verify the feasibility of our proposal.
机译：在这项工作中，通过使用非常众所周知的整体控制方法对切片的西红柿脱水的实验平台的干燥空气温度最佳地调节，当输出系统是整个状态时，可以相当于PI控制。在第一阶段，所选择的控制器是PI，因为工厂步骤响应不具有低阻尼的振荡。然而，获得了该控制器的实验结果，在闭环瞬态响应中存在一些振荡。因此，在第二阶段，应用了一个离散的PID控制器，并且通过使用基于山攀爬方法的数值优化算法来计算其增益，这考虑了二次性能指标;所提出的程序假定植物的输入延迟离散模型;因此，闭环杆位置验证了稳定性。应用最佳控制策略的原因是通过节能和保护过程的所需闭环性能的动力。为了对比使用最佳控制器的优点，将获得的实验结果与随着改进的Ziegler-Nichols规则调整的PID控制器进行比较，这仅考虑根据误差（它不涉及的能量消耗而进行了优化）。此外，还将最佳PI控制给出的性能与最佳状态反馈控制进行了比较。合成的控制器（计算增益）被编程在工业可编程逻辑控制器Siemens S7-1200中，它们适用于切片番茄脱水厂。根据所得的结果，当应用最佳调整的PID控制器时，它会产生节能速率，对产品的更均匀的干燥条件以及更好的闭环植物性能（较短的沉降时间和非目的，这是本类型所需的特征关于其他测试控制器的过程。通过使用PI和PID优化控制器的实验结果允许验证我们提案的可行性。

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