Abstract
The droop control method is one of the issues for proper power distributions in isolated microgrids; in this thesis, the ?−?/?−V ̇ droop control method will be analyzed by linearized systems. One salient feature is that the ?−?/?−V ̇ droop control method can effectively regulate the power sharing among the inverters in the microgrid. It indeed solves the problem of the improper reactive power sharing by conventional droop control methods. In order to capture the essential stability issues in the ?−?/?−V ̇ droop control method, the reduced-ordered model is proposed first in this thesis. Then the analysis will be proceeded by the corresponding transfer matrix. Under certain conditions, it can be shown that the stability of the microgrid system can be determined by impedances of transmissions between the inverters and the droop gains. Simulation studies will be performed on Simulink. Techniques about the root locus are utilize to examine the sensitivity of each parameters used in the droop control. In order to validate the proposed method, experimental studies will be conducted by verify the feasibility and the correctness of the proposed method.