Improved Seamless Switching Control Strategy for AC/DC Hybrid Microgrid

Aiming at the problems of transient over-current and over-voltage in switching process AC/DC hybrid microgrid grid-connected mode island mode, which leads to sudden change transmission power seriously affects quality. In this paper, an improved seamless control strategy droop with disturbance observer is designed. The main work as follow: according diffident calculation methods adaptive realized by detecting current frequency Point Common Coupling(PCC) public grid. Secondly, from will cause impact due difference frequency, phase amplitude between grid, even system collapse. So pre-synchronization Based on control, observation(DOB) added, can quickly track current, suppress tracking value actual value, so realize smooth Finally, effectiveness feasibility are verify Matlab/Simulink.