摘要
调节阀工作流量特性随工艺而变化,难以与被控对象形成广义线性系统;高阀阻比使调节阀消耗大量能量,而低阀阻比又使得流量特性畸变非常严重从而影响控制性能。提出一种改进的变参数控制,使比例增益随设定值与测量值变化,积分时间随设定值与偏差变化,使得调节阀工作特性非线性,特别是阀阻比很低流量特性畸变严重的情况下,对流量也能较好地控制,基本消除了超调,达到了实现低阀阻比节能与提高控制性能的目的。通过将算法在DCS系统上组态与编程加以实现,完成实际装置的流量控制,证明了该控制方案的可行性。
Regulating valve＇ s working flow characteristic changes as the technology condition, so it＇ s hard to form a generalized linear system with the controlled object for regulating valve. High pressure drop ratio makes the valve consume a lot of energy,low pressure drop ratio makes the flow characteristic distort badly and deteriorates the control performance. An improved variable parameter control was proposed. By changing the gain as the set value and the measured value,changing the integral time as set value and control error,the control strategy can get an excellent control performance even when the working characteristic of the regulating valve was non-linear, especially when the pressure drop ratio was very low and the flow characteristic of the valve was badly distorted. Meanwhile the overshoot was basically eliminated, realized the aim of saving energy under low pressure drop ratio circumstance and improving control performance. Through configuration and programming on DCS, practical flow control is realized and the feasibility of this control strategy is proved.
出处
《化工自动化及仪表》
CAS
2008年第4期51-54,58,共5页
Control and Instruments in Chemical Industry
关键词
变参数控制
变增益
变积分
调节阀
流量特性
DCS
variable parameter control
variable gain
variable integral
regulating valve
flow characteristic
DCS
