par Geury, Thomas 
;Pinto, Sonia;Gyselinck, Johan
Référence International review of electrical engineering, 11, 6, page (567-578)
Publication Publié, 2016
;Pinto, Sonia;Gyselinck, Johan Référence International review of electrical engineering, 11, 6, page (567-578)
Publication Publié, 2016
Article révisé par les pairs
| Résumé : | In this paper, three grid-side filter topologies for grid-connected three-phase Photovoltaic Current-Source Inverters are sized and assessed based on the Total Harmonic Distortion of the grid currents, on the power factor in the connection to the grid, and on the filter losses. A second-order LC filter with passive damping resistors in parallel with the filter inductors is first sized and evaluated. It is then improved by removing the resistors and using active damping, with the virtual resistor method and feedback of the inductor voltages requiring no additional measurements. The analysis is conducted taking into account the delays introduced in the control circuit and the relation between the synchronously rotating d and q components of the grid currents. A fourth-order LCLC filter is also sized and considered as an alternative grid-side filter topology to reduce the switching harmonics. Simulation and experimental results obtained with a direct control approach confirm the proper sizing and operation of the filters. Based on the Total Harmonic Distortion (THD) of the grid currents and filter losses, the second-order filter with active damping presents the best results with a THD lower than 5 % and nearly negligible losses. |
