Technical Dialogue Session
Renewable Energy Systems I
grid-connected inverter, LCL filter, grid impedance, adaptive feedforward scheme
Feedforward scheme of point of common coupling (PCC) voltage has been widely applied in grid-connected inverters to improve the harmonic suppression ability. However, when connected to weak grids, the variation of grid impedance poses a challenge to the system stability. Motivated by this, a new feedforward scheme is proposed in this paper, which can retain the strong harmonic suppression ability and at the same time, an adaptive method is proposed to guarantee the system robustness no matter in weak gird or in strong grid. Simulation and experiments verify the effectiveness of the proposed control scheme and adaptive method.