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Although most states and errors are set up automatically by GSP, the user can have control over several states and errors using component model options or special control or scheduling components. For example, by adding a Rotor speed controller to a model, the user extends the set of equations with equation requiring a rotor speed to be equal to a user specified value. The user then also has to add a state variable to make the number of states and errors equal again. Usually with a Rotor speed controller, the fuel flow input (or other Power control input) is turned into a state.

 

If the Show advanced model equation controls options in components Advanced Project option is active, the rules for creating error equations and state variables can be controlled as well as state variable numbers assigned to deactivate particular error equations.