A predictive current controller based on on-line parameter estimation for single-phase distribution grid-connected generation systems

In order to solve the stability problem caused by the parameter mismatch of filter inductance for a conventional predictive current control, a predictive current control method based on on-line parameter estimation of filter inductance is proposed in this paper. The average filter inductance value is calculated in each cycle of grid voltage by means of the average inductance model and phase-locked-loop control. Simulations and experiments are carried out in some conditions such as inductance change, injected current distortion for the anti-islanding detection, voltage change of utility grid, the results verify the proposed method is feasible.