Design of gas-turbine controller using inverse Nyquist method

Following a brief outline of the inverse Nyquist design method as applied to multivariable systems, its application is illustrated by a detailed analysis of the stages involved in the design of a controller for a gas turbine. This leads to a new type of controller which may be regarded as a multivariable version of a classical lead compensator. Comparison with more familiar multivariable design methods shows the inverse Nyquist method to be superior, not only in the controllers it leads to, but also in the information it gives the designer.