燃气轮机定温掺混系统多变量解耦控制器设计

Multivariable decoupling control design of constant temperature mixing system for gas turbine

针对船用间冷循环燃气轮机海水换热器的冷却海水温度变化问题,建立定温掺混系统多输入多输出的数学模型。基于该系统的数学模型及实际物理状态,巧妙地通过引入虚拟控制量对整个控制回路进行解耦。结合增量式PID控制算法设计海水换热器进口水温以及掺混水箱液位的控制器。将该算法真实应用在某型船用间冷循环燃气轮机整机综合试验台上,试验证明,所设计的多变量PID解耦控制器取得了比较好的解耦控制效果,能够满足海水换热器的控制要求。

For the problem of undesired cooling water temperature change of marine intercooled cycle gas turbine seawater heat exchanger,a mathematical model of multiple input and multiple output for constant temperature mixing system was established.Based on the mathematical model and actual physical state of the system,the whole control loop is decoupled by introducing virtual control quantity.The controllers for inlet water temperature of seawater heat exchanger and level of the mixing tank are designed based on incremental PID control algorithm.The proposed algorithm is applied to a marine intercooled cycle gas turbine integrated test platform,and the test results show that the designed multi-variable PID decoupling controller achieves good decoupling control effect and can meet the control requirements of seawater heat exchanger.