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A variable structure flatness based controller achieving both stabilization and energy management in a DC grid is proposed in this paper. The grid connects through undamped LC filters, a voltage source, a storage device and a reversible load. It is shown that the energy management goals along with the reversibility of the load make the grid to behave as a variable structure system and that a fixed...
In this paper, we present a fuzzy observer based fuzzy control scheme for nonlinear processes. The observer and the controller are built by "fuzzily interconnecting" local linear Lu-enberger observers and linear controllers. The approach uses techniques of robust control along with piecewise quadratic lyapunov functions, to show the global stability of observer + controller + process. In...
The paper deals with the problem of singularly perturbed systems when the parameter e, representing the ratio speed between the fast and slow dynamics, is time-varying. We will show that using an adequate fuzzy partition of ε, we can combine techniques of fuzzy control and singular perturbations to control the system. The parameter ε, may be only partially known (known only on some particular "representative"...
In this paper a switching control law, achieving both stabilization and optimal energy management in a DC network, containing a reversible load and a storage device, is proposed. When the reversible load becomes supplier, the closure of a diode en series with the main source, avoid the energy flow towards it. However, this closure disconnects the source's mesh containing "dynamic elements"...
In this paper, a new LED driver and its controller are conceived, realized and experimentally validated. It presents several advantages compared with the existing counterparts: First it uses a single converter while most of the existing drivers are based on a two-converter architecture. In the proposed approach, the average current through the LED is directly regulated. The proposed driver is built...
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