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Performance of gas turbine power plants controlled by weighted one step ahead adaptive technique


Autore: L. Dambrosio , S. M. Camporeale, B. Fortunato

Collana: CA - 55 - Bari Matera 2000

The One Step Ahead Controllers represent a branch of the Minimum Prediction Error Adaptive Controllers. They combine the parameter estimation of the controlled system model with a particular control scheme; therefore, they are especially suitable for non-linear and time-varying systems. Since the estimated parameters are updated at each time step (by using the sampled data), these methods can be

adopted for real-time applications. Consequently, the One Step Ahead Controllers do not require the knowledge of the dynamic characteristics of the controlled system (e.g. state space systems or transfer functions).

Sometimes, an excessive control effort could arise, caused by sudden variations of the electric load.

In order to reduce this control action, the Weighted One Step Ahead Adaptive (WOSAA) control algorithm considers a penalty associated with the control effort by use an appropriate cost function. In

such a way, the control variable does not assume too large values, even when the Gas Turbine undergoes sudden changes in the external load. As a consequence, the robustness and the stability features of the WOSAA control system are increased.

The results show that the WOSAA control technique, applied to both the double-shaft aero-derivative gas turbine and the single shaft heavy-duty gas turbine, effectively counteracts the load reduction with limited overshoot in the controlled variables with reduced control effort.

(Testo in inglese)

(9 pagine)

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