Abstract
This paper presents modal analysis of a large offshore wind farm using permanent magnet synchronous generator (PMSG)-type wind turbines connected to a voltage source converter HVDC (VSC-HVDC). Multiple resonant frequencies are observed in the ac grid of offshore wind farms. Their control is crucial for the uninterrupted operation of the wind farm system. The characteristics of oscillatory modes are presented using modal analysis and participation factor analysis. Sensitivity of critical modes to wind turbine design parameters and their impact on closed loop stability of the system are discussed. A comparison between a full wind farm model and an aggregated model is presented to show differences in the characteristics of critical modes observed in the models, and implication of using the models for stability studies It is concluded that robust control design is important for reliable operation of the system.
Highlights
M ANY countries are developing offshore wind farms of several hundred MW capacity in order to meet their future energy demand
The results shows that permanent magnet synchronous generator (PMSG) parameters have significant influence on the design of voltage source converter (VSC)
This paper discusses oscillatory modes present in an offshore wind farm system connected to a VSC-HVDC system using modal analysis tools
Summary
M ANY countries are developing offshore wind farms of several hundred MW capacity in order to meet their future energy demand. These wind farms are being located far away from the shore which makes HVDC transmission using voltage source converter (VSC) a preferred option. The wind farm systems are reported to contain multiple resonance modes in the collector network [2] that can cause operational issues. The number of modes and their characteristics can vary as the operating configurations changes for several reasons such as: prevailing wind speed, wind direction, wake effect, availability of individual WTGs for maintenance, and the energy requirements from the main grid.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
