Abstract
The model parameters of a gas turbine, which has nonlinear characteristics, are variable under the effect of load change, environmental conditions, and so on. Therefore, robust control is necessary for sufficient controlability. Especially, property to keep the response of control system unvaried against the change of dynamics of a gas turbine is desirable for the reliability of over speed protection, that of acceleration control and operationability of a vehicle gas turbine. Design of robust control system is more difficult for a two-spool gas turbine than a one-spool gas turbine because of many variable parameters of a gas turbine model. This paper mentions the robust control design method which keeps the response of a two-spool gas turbine control system unvaried, as well as experimental results which show the usefullness of the design method. Using this design method, optimal values of control parameters which keep the control system model closest to the α assigned reference model within the region of variation of gas turbine parameters can be obtained. This reference model, which is used for the partial model matching, has a certain range for obtaining desirable response. This property of the reference model gives robustness to a gas turbine control system without excessive high gains.
