Model-Free Predictive Current Control for Three-Phase Power Converters With LCL Filter

Abstract

This paper proposes a model-free predictive current control (MFPCC) based on ultra-local model algorithm to control the grid-connected, pulse-width modulator driven voltage source converters with LCL filters. Finite Control Set Model Predictive Control (FCS-MPC) technique can offer superior dynamic response and the use of ultra-local model can offer robust control performance. Resonant current compensation is added in the out-loop control to eliminate the steady-state tracking error and to achieve superior disturbance rejection. A 3-phase/150V VSR with LCL filter experimental platform has been established to validate that utilizing the proposed ultra-local based MFPCC method, insensitivity to power supply fluctuations and to large load variations is ensured, which showing excellent agreement with those obtained in simulation.