Abstract
In this paper, primary and secondary emissions in wind power plants are studied by using transfer admittance and current transfer functions between turbines and the public grid. The use of such transfer functions allows harmonic propagation studies without knowledge of the emission from individual turbines or the background voltage distortion. The transfer functions are calculated for one synthetic and one existing wind power plant, and results are discussed. Primary emission, secondary emission from other turbines and secondary emission from the public grid are shown to be of the same order of magnitude. Furthermore, the paper addresses the impact of turbine converter modelling, public grid impedance and the change in the aggregation exponent with frequency on the propagation. All three are shown to have a significant impact and should be considered. The main challenge for future studies is in obtaining relevant models for turbine impedance versus frequency.
Highlights
With the increasing number of wind power plants (WPPs), studies are regularly performed to determine their impact on the power grid, including studies of their harmonic emission when being connected to the public grid [1,2,3,4,5]
The harmonic transfers between turbines, into the collection grid and into the public grid, were obtained, and some of the results are presented in the forthcoming subsections
Primary and secondary emissions of a wind power plant were studied by using different transfer functions
Summary
With the increasing number of wind power plants (WPPs), studies are regularly performed to determine their impact on the power grid, including studies of their harmonic emission when being connected to the public grid [1,2,3,4,5]. The requirements commonly refer to the approaches and limits in IEEE 519 [13] and IEC 61000-3-6 [14]. Both assume that emission is only caused by the turbines in the WPP and not by any external sources. The possible impact of background distortion for individual turbines and for the WPP as a whole is mentioned in a range of publications (for example, [18,19,20,21,22])
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