Abstract
A large offshore wind farm usually consists of dozens or even hundreds of wind turbines. Due to the limitation of the simulation scale, it is necessary to develop an equivalent model of offshore wind farms for power system studies. At present, the aggregation method is widely adopted for wind farm equivalent modeling. In this paper, the topology, electrical parameters, operating conditions and individual turbine characteristics of the offshore wind farms are taken into consideration. Firstly, the output power distribution of offshore wind farm, the voltage distribution of the collector system and the fault ride-through characteristics of wind turbines are analyzed. Then, a dynamic equivalent modeling method for offshore wind farms is developed based on the fault characteristics analysis. Finally, the proposed method is validated through time-domain simulation.
Highlights
Offshore wind farms (OWFs) have broad prospects and space for development [1]
In power system time-domain simulation analysis, the utilization of detailed model of each wind turbines (WTs) will result in massive computation, long time, large memory usage and difficulties in data processing and results analysis [2]
It is necessary to establish an equivalent model for stability analysis of OWFs integrated power systems, which could accurately reflect the dynamic characteristics of OWFs under grid faults
Summary
Offshore wind farms (OWFs) have broad prospects and space for development [1]. With the development and maturity of offshore wind power technology, the scale of OWFs will become larger. It is necessary to establish an equivalent model for stability analysis of OWFs integrated power systems, which could accurately reflect the dynamic characteristics of OWFs under grid faults. The aggregation method is widely adopted for wind farm equivalent modeling. The equivalent model and the detailed model of the wind farm have the same voltage, current and power characteristics at the point of common coupling (PCC). The output power distribution of OWFs, the voltage distribution of the collector system and the FRT characteristics of WTs are analyzed. A dynamic equivalent modeling method for OWFs is developed based on the fault characteristics analysis. The effectiveness of the proposed method is verified through time-domain simulation
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