Valve hysteresis compensation considering flow conditions for digital valve positioner
Valve hysteresis compensation considering flow conditions for digital valve positioner
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DOI：
10.11499/sicep.2004.0.50.1
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
T. Wakui;T. Hashizume;T. Nishijima
中科院分区：
文献类型：
--
作者：
T. Wakui;T. Hashizume;T. Nishijima
本文分析了气动控制阀/数字定位器系统的行为，有一个大的滞后，由于一个收紧的大包装，并检查其控制方案，努力提高系统的性能。作者证实，在位置控制的积分器中引入带有间隙的PID控制动作和隔膜压力的微小反馈控制是确保系统稳定性和动态响应的有效方法。为了进一步改善这种串级控制下对位置设定点微小变化的行为，本文提出了一种考虑流量条件的阀门迟滞补偿算法。在这种补偿中，隔膜压力通过前馈控制，使得阀杆立即开始克服包括流体阻力在内的大的阀滞后而移动。通过实验研究，验证了该补偿算法的有效性.
This paper analyzes the behavior of a pneumatic control valve/digital positioner system that has a large hysteresis due to a tightened grand packing and examines its control scheme in an effort to improve the system performance. The authors have confirmed that introducing a PID control action with a gap in the integrator of the position control and a minor feedback control of the diaphragm pressure is an effective way to ensure the stability and dynamic response of the system. In order to further improve the behavior under this cascading control against small changes of the position set point, this paper proposes a valve hysteresis compensation algorithm considering flow conditions. In this compensation, the diaphragm pressure is controlled with feedforward so that the stem immediately starts to move against the large valve hysteresis including the fluid resistance. Through experimental investigations, the effectiveness of this compensation algorithm is confirmed.