Voltage/frequency restorations for global power sharing controlled hybrid AC/DC microgrids
Date of Issue2018-09-11
School of Electrical and Electronic Engineering
With the shortage of energy and environmental pollution problems, the active utilization of the renewable energy has caught much attention of the world. Distributed generation converts energy including renewable energy into electricity and accesses distribution network systems. It is an effective form of new energy use. The microgrid is a controllable intelligent power distribution system, which provides a technical method for the largescale distribution of distributed power to the distribution system and the efficient use of new energy and renewable energy. The distributed power supplied in the microgrid is integrated into the microgrid system through power electronic devices. Therefore, the control of the power electronic devices in the distributed power system supplies gives full play to the flexibility of the microgrid power transmission and ensures the microgrid operated in a stable state. The dissertation mainly studies the voltage/frequency restorations for global power sharing controlled hybrid AC/DC microgrids. Converters including boost converter and bi-directional AC/DC converter are studied on the basis of analyzing these converters’ structure, thus we establish the mathematical model of converters. Then, we model the hybrid AC/DC microgrid from AC sub-grid and DC sub-grid and use MATLAB/Simulink to do the modeling. Last, we research the secondary control after the droop control. And use MATLAB/Simulink to do the comparison between the two operation states to verify the success and reliability of the secondary control.
DRNTU::Engineering::Electrical and electronic engineering