| Abstract |
In islanding operation with high shares of renewables, transient disturbances may put the systemin danger of instability. In such a situation, the frequency-voltage profile of the remaining powersystem, does not only depend on the depth of the unbalance, which appears following a transient,but also to the percentage of renewables and their control topologies as well as the dominantload on the islanded area. Hence in this paper, the renewables are controlled to act as a grid supporting current and voltage sources. Also the load characteristic is varying from dominantresistive, to dominant induction machine and converter- fed loads. The emergency measuresfor under- and over-frequency and voltage control is also considered the same in all simulationscenarios. The simulations are carried out in Matlab-Simulink via different scenarios to find outif the islanded power system and the generation units in that area are able to handle such atransient event considering different criteria via the emergency measures in the islanded powersystem. |
