Nous avons le plaisir de vous annoncer le séminaire de 

Nabil KARANIA, doctorant de l’équipe ANLER, portant sur un "Contrôleur hybride pour filtre actif shunt basé sur un onduleur multiniveau ". 

Le 22/06/2023 à 13h15 via Teams.

Résumé  (EN) :

This seminar presents a hybrid controller for a Multi-Level Inverter (MLI) based Shunt Active Filter structure (SAF) that is composed of Cascaded H-Bridge modules (CHB). This structure enhances the performance of SAF to mitigate the harmonic perturbation, solve the imbalance conditions and compensate the reactive power of linear and nonlinear loads. The hybrid controller is implemented using Petri Nets (PNs) as tool to ensure the appropriate control action. This hybrid controller is composed of two PN controllers, current and voltage controllers.

The current controller is used to ensure high performance tracking of the compensating current and to inject it by the SAF into the grid in phase opposite the perturbing loads current. This process aims to eliminate the perturbations generated by linear and nonlinear loads. It is important to highlight that the instantaneous power method is employed to identify the perturbing current. For the voltage controller, it is used to stabilize the DC voltage for each CHB and balance the DC voltages among the various CHB modules.

The SAF benefits of presence the CHB based MLI structure to increase the apparent frequency seen from the grid. This advantage results in improving the power quality of the output voltage, reducing IGBT operating voltages, minimizing the size and cost of output filter, and overcoming the industrial limitations of the classical two-level inverter based active filters. It is worth noting that one objective of this study is to minimize the number of CHB modules in order to fulfill the industrial requirements.

In this study, hysteresis Band (HB) is integrated in the current controller to achieve accurate tracking with minimum error of the injected current. The hysteresis width is fixed to satisfy the desired operating switching frequency of the SAF while minimizing the tracking error. At the same context, the voltage controller ensures the asymptotic stability of tracked voltage through analytical proof via the Lyapunov approach.

To validate the performance of the overall proposed structure including the hybrid controller, a case study is presented, based on real measurements for a textile factory which experiences harmonic impact on its production lines. Note that the real measurements are carried out using power quality analyzer measurement devices. Finally, this case study demonstrates how a sensitive load can be protected using the proposed structure.