文章摘要
陈晨,尚群立,陈艳宇.基于调节阀流量特性曲线的前馈控制系统设计[J].高技术通讯(中文),2021,31(11):1219~1227
基于调节阀流量特性曲线的前馈控制系统设计
Design of feedforward control system based on flow characteristic curve of control valve
  
DOI:10.3772/j.issn.1002-0470.2021.11.012
中文关键词: 前馈; 非线性补偿; 流量特性曲线; 液位控制系统; 干扰流量
英文关键词: feedforward, nonlinear compensation, flow characteristic curve, liquid level control system, interference flow
基金项目:
作者单位
陈晨  
尚群立  
陈艳宇  
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中文摘要:
      当液位控制系统中加入流量扰动后,经典控制理论中的前馈控制是使前馈环节与闭环系统的传递函数之积为1、使输出完全复现输入。由于控制系统内部各环节间存在非线性,以及对建模精度要求较高,在工程上难以实现。本文基于液位控制系统,提出利用实际工况参数,调节阀阀位、管路中流量与水箱液位来确定前馈补偿系数。其中调节阀阀位与管路中流量大小由调节阀的流量特性曲线所决定。在实际生产中,阀位与流量之间存在非线性关系,从而导致不同液位、不同干扰大小下的前馈补偿系数不一致,即在某工况下计算的前馈补偿系数并不能适用于其他工况。为此,本文进一步提出一种补偿阀位非线性的方法,改变阀的流量特性曲线,使阀位与流量呈线性关系。该方法使不同液位、不同干扰下的前馈补偿系数固定不变。通过仿真与实验验证了该方法的有效性。
英文摘要:
      When the flow disturbance is added to the liquid level control system, the feedforward control in the classical control theory is to make the product of the feedforward link and the transfer function of the closed-loop system be 1, so that the output can fully reproduce the input. Because of the nonlinearity in the control system and the high requirement of modeling accuracy, it is difficult to realize the feedforward control in engineering. Based on the liquid level control system, this paper proposes to determine the feed-forward compensation coefficient by using actual working condition parameters, regulating valve position, flow rate in pipeline and liquid level of water tank. The control valve position and the flow in the pipeline are determined by the flow characteristic curve of the control valve. In actual production, there is a non-linear relationship between valve position and flow rate, which leads to the inconsistency of feed-forward compensation coefficient under different liquid level and different interference. That is, the feedforward compensation coefficient calculated under certain working conditions cannot be applied to other working conditions. Therefore, this paper further proposes a method to compensate the nonlinearity of the valve position, changing the flow characteristic curve of the valve, and make the relationship between the valve position and flow be linear. This method makes the feedforward compensation coefficient fixed under different liquid level and different interference. The effectiveness of the method is verified by simulation and experiment.
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