Dynamic Interaction of large Offshore Wind Farms with the Electric Power System

The paper explores the influence of large offshore wind farms on the performance of the system to which they are connected. To meet the emerging requirements of the power system with regard to voltage and frequency, controllers with extended features have been used that enable the control of the terminal voltage and the participation of large wind farms on system frequency control. The models of the wind turbine and the electrical machines together with the proposed control structure are integrated into a power system simulation environment. Then, the impact of planned offshore wind farms on the transient stability performance of parallel operating conventional power plants and the bus voltage profile of the network during fault for alternative wind generator types are investigated. Additionally, the response of the wind farm to a major load change in a large multi-machine network is simulated and the results discussed. Index Terms -Control systems, Dynamics, Induction generators, Power systems, Simulation software, Transient stability, Variable speed drives, Wind power generation.