| Abstract |
The design of current controller of voltage source converter connected to the grid through an LCLfilter becomes more and more challenging because of the LCL filter resonance behaviour and theuncertainty of the grid impedance value which may lead to instability problems. In this context, arobust active damping control for LCL filtered grid connected inverter under grid inductance variationis proposed in this paper. The two useful methodologies, Lyapunov stability theory and LMI approach,are adopted to design robust observer-based control for this class of uncertain systems. Thesimulations results are given to illustrate the effectiveness of this control. A comparison study of theresults derived in this work with previous observer based active damping method shows thesuperiority of the proposed design strategy. |
