Inverter-Side Current Control of Grid-Connected Voltage Source Inverters with LCL Filter based on Generalized Predictive Control

MARCOS G. JUDEWICZ; JUAN F. MARTINEZ; SERGIO ALEJANDRO GONZALEZ; DANIEL O. CARRICA; JONATAN R. FISCHER

IEEE Journal of Emerging and Selected Topics in Power Electronics

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Lugar: New York; Año: 2018 vol. 6 p. 1732 - 1743

2168-6777

In this work, an inverter-side current control strategy for grid-connected VSI with LCL filters is proposed based on a generalized predictive control (GPC) formulation as it has the advantages of fixed switching frequency, a systematic design procedure and low computational complexity. As the GPC strategy is a subtype of continuous-control-set model predictive control (CCS-MPC) strategies, a proper model for controlling the inverter-side current is obtained, showing that a full-order model is preferred to its first-order counterpart. The controller is designed taking into consideration harmonic distortion limits and robustness against filter component variations. To this end, a complete three-wire LCL filter model is obtained and impedance sensitivity to each component variation is analyzed. Finally, its performance is evaluated by means of experimental results and compared with a predictive deadbeat (PDB) controller.