Abstract
This paper presents modeling and analysis of electrical oscillations in a wind farm system. The detailed modeling and modal analysis of a wind farm system are presented in this paper. The approach to modeling uses detailed representation of a wind turbine generator and collection system including high-voltage direct-current (HVDC) power converter system control, facilitating a comprehensive analysis of the wind farm system. Various modes are classified according to the frequency of oscillation. The detailed modal analysis is used to characterize the critical modes. Time-domain simulation also confirms the presence of these modes. The effect of wind farm operating conditions and voltage source converter control tuning on critical oscillatory modes are also assessed and discussed in detail.
Highlights
W IND ENERGY is the fastest growing renewable energy resource for electricity generation in recent times
A nonlinear dynamic simulation is carried out using the operating condition test-1, where all the wind turbine generator (WTG) are working at rated operating condition
The results both in the frequency and time domain show that the three medium-frequency modes and the WTG stator modes are critical for the stable operation of wind farms
Summary
W IND ENERGY is the fastest growing renewable energy resource for electricity generation in recent times. Studies and analysis carried out in this topic generally concentrate on the grid-side problems of power system such as stability, voltage control, and the operational aspects of the power system. Such studies use an aggregate or semiaggregated model of wind farm due to simulation time constraint where several wind turbine generators (WTGs) are aggregated and represented as one WTG [3]–[8]. The modal analysis results are validated using nonlinear dynamic simulation presented in Section V in which a step change has been applied to the WTG and the VSC reference inputs to excite various oscillatory modes. Power flow at different locations are plotted to show the presence of these oscillatory modes
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