Study On Load-support Plan By Isolated Microgrid In Emergency

Microgrid technology provides a promising solution to overcome the power grid’svulnerability. When large power grid separates into several parts or even blackouts,active islanding operation mode of the Microgrid is expected to ensure power supply ofimportant loads continuously. Therefore, Combining with the engineering practice, weshould study on load support technology based on Microgrid in response to a large-scalepower outages and other kinds of accidents. And this research will become the emphasis inthe field of electric power. And China is going to build a strong smart grid on the basis ofthe distributed generation of Microgrid construction vigorously, which provides a goodapplication prospect and broad platform for the massive power cutoff in our country underthe load support research.Firstly, this article gives an introduction to Microgrid load supporting control theorynowadays in details, including Microgrid prevention and control theory, Microgridemergency control theory and Microgrid reconfiguration theory. And Microgridreconfiguration theory is especially explained. Microgrid reconfiguration problem couldbe seen as a nonlinear optimization objective function solving problem, which effectivelysupport important loads in the case of blackouts. And also, we compare the similaritiesand differences between power grid emergency control and Microgrid reconfiguration. But,at the same time, the article points out that the current control theory under the extremenatural disasters is not appropriate for island operation mode of Microgrid.In this article, a novel MAS-based approach for microgrid reconfiguration ispresented in order to achieve optimal objective under system constraints. By coordinationbetween agents, the relevant agents completes the tasks by regulation. This architectureneed no iteration calculation and has high engineering practicability. Test case resultverified the feasibility of the proposed MAS on microgrid reconfiguration.Finally, coordinated control strategy of isolated Microgrid under the emergencyoperation are studied and the control strategy is applied to reutilize the sparenon-dispatchable DG in isolated Microgrid, which could give full play to thenon-dispatchable DG in the field of load support during load recovery. This method guarantees continuous power supply of important load for a long time and reduce the lossof the social economy by the greatest extent. Simulation examples verify the effectivenessof the proposed method.