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The dynamic nature of the distribution network challenges the stability and control effectiveness of the microgrids in both grid-connected and autonomous modes. In this paper, linear and nonlinear models of microgrids operating in different modes are presented. Optimal design of LC filter, controller parameters, and damping resistance is carried out in case of grid-connected mode. On the other hand,...
The state-space model and implementation results of a power conditioning system are presented in this paper. Eigenvalues with different controller gains and load conditions for grid-tie mode and standalone mode are utilized to analyze the system stability. For standalone mode, higher controller gain and higher load resistance tend to make system more unstable. In grid-tie mode, higher controller gain...
This paper presents control methodology of UPFC (unified power flow controller) for stable operation of distributed generators on distribution system. The UPFC consists of two parts, shunt and series compensation parts. The shunt part controls the power flow from the power system to be constant. The series part compensates unbalanced voltage and voltage sag. In addition, the proposed UPFC keeps operation...
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