Due to the existing serious climate and environment problems caused by burning fossil fuels, nuclear energy is now rapidly developed. Power-level control for nuclear reactors is significant for not only regular operating but also safety issues. The advances in computer technology, information processing, and control theory in the past decades allow the applications of advanced controllers with higher performance. In this paper, the separation principle for the recently established dissipation based high gain filter (DHGF) is presented, which guarantees the closed-loop stability of the system interconnected with a state-feedback controller and the DHGF. Then, the feasibility of applying the DHGF to the load-following control of nuclear reactors has then been verified. Finally, the DHGF with a well designed state-feedback power-level controller has been successfully applied to realize the load-following control for a nuclear heating reactor (NHR). Numerical simulation results has shown the high performance of the DHGF and the feasibility of the DHGF-based output feedback control strategy, and influence of the observer gain to the control and observation performance has also been analyzed.

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