In this study a DC-DC switching regulator with step-down capacity is presented. It uses a converter based on non-cascading structures. A model of the converter, as well as a controller design procedure to achieve the ...
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In this study a DC-DC switching regulator with step-down capacity is presented. It uses a converter based on non-cascading structures. A model of the converter, as well as a controller design procedure to achieve the regulation task, is presented. For the controller design, a control scheme that consists of two control loops is applied. The inner loop is built using the inductor current as feedback. The outer loop is implemented using a proportional-integral controller. The tuning procedure of the controller parameters was developed from the state-space non-linear averaged model of the converter, where the necessary conditions for the existence of an unique operating point and stability in closed-loop are obtained. To prove the effectiveness of the switching regulator, numerical simulations and experimental results are presented.
In this study, model predictive control (MPC) of large-scale sewage systems is addressed, considering several inherent continuous/discrete phenomena (overflows in sewers and tanks) and elements (weirs) in the system. ...
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In this study, model predictive control (MPC) of large-scale sewage systems is addressed, considering several inherent continuous/discrete phenomena (overflows in sewers and tanks) and elements (weirs) in the system. This fact results in distinct behaviour depending on the dynamic state (flow/volume) of the network. These behaviours cannot be neglected nor can be modelled by a pure linear representation. In order to take into account these phenomena and elements in the design of the control strategy, a modelling approach based on piece-wise linear functions (PWLF) is proposed and compared against a hybrid modelling approach previously suggested by the authors. Control performance results and associated computation times of the closed-loop scheme considering both modelling approaches are compared by using a real case study based on the Barcelona sewer network. Results have shown an important reduction in the computation time when the PWLF-based model is used, with an acceptable suboptimality level in the closed-loop system performance.
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