Research On Islanding Of Distributed Generation After System Fault

With the Distributed Generation (DG) scale, the expansion of capacity in power generation and the increase in the proportion, when the system failure, if simple DG will be removed from the online distribution, will be difficult to ensure the reliability of electricity distribution network, so that the effect of the installation of DG Compromise. Therefore, it is necessary in-depth study on a fault under the conditions of the island DG run, bring into full play the positive role of DG, to avoid DG the adverse effects on the power system stability and security, and make the power system more efficient, reliable operation. In order to study the situation of DG islanding running, this article made a example of DG accessed on 110kV and 10kV bus of 110kV transformer substation, and analyze that whether DG can create isolated island with its own capacity, the nature of load and the position of fault, therefore, the paper distribution network system with the actual situation, the use of simulation and the DG network capacity, load in the nature of the different circumstances DG Instability an analysis of the situation, the DG can be formed to study the island must meet the conditions and gives a different power grid failures in the circumstances DG formation of the island; satisfy the conditions in the DG, the system side after the failure, DG formed Can the island within the island to maintain stability and support operation, that is isolated island after the formation of the relevant control, including its Separation measures,strategy to protect and control,re-merger to network and transient stability are done analysis and research, and eventually ensure the different judgment on operation mode of DG. Following which come to this:to implement a viable island strategy of DG is a feasible mode of operation after system fault, its good for improving the stability of system.