Harmonic aspects of wind power integration

This paper discusses a number of ways in which wind power installations can impact the harmonic levels in the power system.Wind turbines are an additional source of harmonic emission,especially when it concerns"non-characteristic harmonics."Parallel resonances can amplify the emission from individual turbines.A mathematical model is developed to quantify this amplification.Series resonances can result in high currents,driven by the background voltage distortion in the transmission grid,flowing into thewind park.Weakening of the transmission grid will increase lower order harmonics but reduce higher order harmonics.

Susceptibility of Large Wind Power Plants to Voltage Disturbances-Recommendations to Stakeholders

Sufficient fault ride-through(FRT)of large wind power plants(WPPs)is essential for the operation security of transmission system.The majority of studies on FRT do not include all disturbances originating in the transmission system or the disturbances irrelevant to the operation security.Based on the knowledge of power quality,this paper provides a guide to stakeholders in different aspects of FRT for wind turbines(WTs)and WPPs.This paper details the characteristics of the most common disturbances originated in the transmission system,how they propagate to the WT terminals,and how they impact the dynamic behavior of a large WPP.This paper shows that the details of the voltage disturbances,not only in the transmission system,but also at the WT terminals,should be taken into consideration.Moreover,a detailed representation or characterization of voltage dips is important for FRT studies,despite that the simplified models used in the literature are insufficient.This paper strongly recommends that distinct events and additional characteristics such as the phase-angle jump and oscillations in the transition segments should be considered in FRT analysis.