| The extensive use of power converters in various industrial plants deteriorates the power quality and causes multitude of concerns, such as: improvement of converters effeciency, reduction of reactive power exchange and attenuation of current harmonics.; The principal objective of this work is to develop a non-polluting three-phase rectifier, with unity power factor, high efficiency and low harmonics. Also, our objective is to find good control techniques to ensure excellent system performance under parametric variations and utility disturbances.; To support this objective, A extensive bibliographical review of non-polluting topologies made possible to choose a three-phase three-level neutral point clamped boost rectifier one that allows a better use of power switches. Then, the converter model is developped in order to apply nonlinear control methods. These last are employed to take into account the essential nonlinearities of the system and they totally differ from the common approach based on linearizing the nonlinear system around an operating point.; The nonlinear state space mathematical model of the rectifier is developed. Then, in order to apply the first nonlinear technique, an input/output feedback linearization is designed and the resulting model is linearized and decoupled. Afterward, the stabilizing controllers are designed based on linear techniques. Simulation results show the weaknesses of this method under some disturbances. The adaptive version of this technique is then proposed and applied. The initial state space model is put in an adequate canonical form. Therefore, an adaptation law based on the model reference approach is incorporated. The controllers performance has been evaluated by simulation and show the superiority of nonlinear adaptive control.; Once the theoretical study is completed, an experimental prototype operating at 1230W is built in order to validate the proposed control laws. These techniques are implemented in real time using DS1104 of dSPACERTM digital signal processor. The experimental results are given for nominal power, under diverse parameter variations and utility disturbances. The superiority and the robustness of the nonlinear adaptive control law is established. Finally, the results of this work are published in several international journals and conferences. |
