A Collaborated Multi-controller Strategy by Using L1 Adaptive Augmentation Control for Power-generation Systems with Uncertainties
Keywords:L1 adaptive controller, linear controller, uncertainty, nonlinearity, power plants.
For dealing with uncertain operation circumstances, a collaborated multi-controller strategy of the cascade architecture with a L1 adaptive augmentation controller and a conventional baseline controller is introduced to power-generation systems. For its arbitrarily close, fast, and robust tracking performance, the L1 adaptive output feedback controller is designed as the augmentation controller in the inner-loop to keep the nominal dynamics of the system in the overall operation scope. The robust PID controller and offset-free linear MPC controller are recommended as the available outer-loop baseline controllers to follow control commands. The closed-loop stability of the cascade control system is ensured. The simulation experiments on a benchmark nonlinear boiler-turbine generation model verify the greatly improved adaptation and robustness of the augmentation control system in the presence of unknown uncertainties. Additionally, it is easy to upgrade a conventional control system to this cascade one in practice because the add-in L1 adaptive augmentation controller influence little on the augmented system setup.
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