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首页> 外文期刊>Arabian Journal for Science and Engineering >A Robust Fractional Order Parallel Control Structure for Flow Control using a Pneumatic Control Valve with Nonlinear and Uncertain Dynamics
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A Robust Fractional Order Parallel Control Structure for Flow Control using a Pneumatic Control Valve with Nonlinear and Uncertain Dynamics

机译：使用具有非线性和不确定动态特性的气动控制阀进行流量控制的鲁棒分数阶并联控制结构

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摘要

Control of flow rate in industrial plants is an essential and crucial task, which is usually achieved by pneumatic control valves in industries. Use of these valves often incorporates nonlinear and uncertain dynamics in the control loop on account of its input-output characteristics, which may result in degradation of control loop performance. To address this concern, a robust and improved fractional order parallel control structure (FOPCS) for flow control is proposed in this paper. The proposed FOPCS is an extension of parallel control structure (PCS) with the help of fractional order calculus, to enhance the robustness in the control loop without compromising with control performance. Also, a global optimization technique, backtracking search algorithm was further employed to critically tune the parameters of control structures. This was done in order to obtain an optimized and enhanced performance from the control loop. Extensive runtime studies on a laboratory scale plant, using advanced data acquisition facilities, were carried out to showcase the effectiveness of developed FOPCS. Proposed FOPCS is thoroughly assessed in terms of servo, regulatory and robustness performance. A quantitative comparison of FOPCS with PCS is also made on the basis of integral of absolute error, integral of absolute rate of controller output and their algebraic summation. All the conducted experimental studies suggested that proposed FOPCS was able to address the issues pertaining to uncertain and nonlinear behaviour of pneumatic control valve in the flow control loop.
机译：控制工业工厂中的流量是一项至关重要的任务，通常是通过工业中的气动控制阀来实现的。这些阀门的使用通常会由于其输入-输出特性而在控制回路中引入非线性和不确定的动力学特性，这可能会导致控制回路性能下降。为了解决这个问题，本文提出了一种鲁棒且改进的分数阶并行控制结构（FOPCS）用于流量控制。所提出的FOPCS是在分数阶微积分的帮助下对并行控制结构（PCS）的扩展，以增强控制回路的鲁棒性而不会影响控制性能。此外，还采用了全局优化技术，回溯搜索算法来严格调整控制结构的参数。这样做是为了从控制回路中获得优化和增强的性能。使用先进的数据采集设备，对实验室规模的工厂进行了广泛的运行时间研究，以展示已开发的FOPCS的有效性。拟议的FOPCS在伺服，调节和鲁棒性方面进行了全面评估。还基于绝对误差的积分，控制器输出的绝对速率的积分及其代数求和，对FOPCS与PCS进行了定量比较。所有进行的实验研究表明，提出的FOPCS能够解决与流量控制回路中气动控制阀的不确定性和非线性行为有关的问题。

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