摘要
利用PID控制器对多变量系统进行控制,主要采取分散常规控制或解耦控制的策略。对于存在耦合的系统,分散常规控制无法消除各变量间的相互扰动,而直接设计动态解耦矩阵有时候会存在困难,静态解耦的效果却并不明显。针对已设计好分散常规控制器的方系统,以解耦为目标和原则,设计多变量系统中分散常规控制方案剩余配对的控制器作为辅助控制器,以频域近似的方法整定其PID参数,实现多输入多输出的控制结构,降低了各变量的相互耦合作用,提高了控制性能。通过对Shell公司的典型控制问题的辅助控制器设计与仿真实验,取得了比原有分散常规控制与静态解耦控制更好的控制效果,验证了控制策略的可行性与有效性。
When PID controller was used to muhivariable system, decentralized control or decoupling control was mainly applied. For coupled system, decentralized control couldn＇t eliminate the interactive disturbance between different variables, but design dynamic decoupling matrix directly was difficult and static decoupling control was of non-ideal control performance. So an auxiliary controller design method based on decentralized control strategy was proposed. For decoupling, the other control pairs besides the diagonal control pairs of decentralized control strategy were designed as auxiliary controllers. The PID parameters were tuned based on frequency domain approximation approach. This method realizes the MIMO control structure and reduces the interaction between different variables. When this method is used for the Shell standard control problem, it shows the better control performance than ordinary decentralized control and static decoupling control.
出处
《化工自动化及仪表》
CAS
北大核心
2009年第4期33-37,共5页
Control and Instruments in Chemical Industry
