The Passivity-based Control with Luenberger State Observer of Three-phase Grid Connected Converter

In this paper, to achieve high performance with as few sensors as possible, the passivity-based control (PBC) with Luenberger state observer is applied to a three-phase grid connected converter. The detailed mathematical model, control principle and controller design of the converter are thoroughly analyzed in principle. In addition, simulation results based on SIMULINK are also given to verify the theoretical analysis in the paper. It can be concluded from the results that the proposed control has good static and transient estimating performance, and it also has a good performance under severe external environments as large system impedance, severe PCC volt-ages unbalance and large PCC voltages harmonics.