Equivalent model and static var compensation for offshore wind farm implemented on PSCAD/EMTDC

Our work is to establish an equivalent model for a 200MW offshore wind farm under construction and research the improvement of power quality at point of common connection (PCC) on PSCAD/EMTDC. Considering that the wind turbines in the different regions of wind farm are clustered into groups according to the received wind speed, the semi-aggregated equivalent model, not the aggregation into a single wind generator, is applied to represent the collective response of the offshore wind farm based on the paralleled transformation of internal collector network. Since high voltage alternative current (HVAC) is the better solution for short-distance transmission system connection the offshore wind farm to the on-land electrical grid, static var compensation (SVC) is employed to compensate the reactive power generated by the submarine cables and improve the power quality. Simulation results show that the semi-aggregated equivalent model for offshore wind farm is reasonable and effective, and SVC can compensate the reaction power and enhance the power quality at PCC as well.