Assessing Time-Varying Harmonic Interactions in a Wind Park

Abstract

The harmonic interaction mechanism in a wind park is examined in this paper. The paper investigates the feasibility of a solution to the yet challenging harmonic contribution estimation from multiple sources in a wind park with limited available information, via an extension of a simple modeling approach as well as from detailed analysis of field measurements. The paper has two distinct objectives in assessing harmonic interactions (a) one to extend the classical Norton equivalent model to a multi-measurement wind park system and to suggest potential areas for further model developments from field measurement analysis, and (b) second to draw inferences from field measurements and to develop a new independent concept of analysis from long-term field measurements in the wind park. From practical experience, a new concept of analysis with a 'harmonic interaction break-even point' is introduced. With the help of it, one could identify whether the primary emission (emission from considered source) or secondary emission (emission from a distant source) dominates in the analysis period. In this way, the highest responsibility between different interacting time-varying harmonic sources is evaluated. It was concluded that from long-term measurements one can define a magnitude of power production where a certain harmonic order is canceled or reaches its lowest magnitude. If one finds this cancellation point, one can define a level of secondary/primary emission or at least a feasible range. This knowledge is a step forward towards harmonic contribution analysis.

Quantitative Analysis of the Interactive Influence for Harmonic Emission in Wind Farms

“…Harmonic emissions of variable speed wind turbines are a well-known issue (Tentzerakis and Papathanassiou, 2007). The harmonic of the point of common coupling (PCC) in the wind farm network is resulted from the combination of the one emitted by itself and the one caused from the external system (Ravindran et al, 2021;Tan et al, 2019). The closer the distance between the harmonic sources, the more obvious the harmonic interaction phenomenon (Arghandeh et al, 2013).…”

Harmonic Transfers for Quantifying Propagation of Harmonics in Wind Power Plants

“…The emission from wind turbines is difficult to predict in the design stage of the park, and even measurements performed during operation rarely give unambiguous information on the actual emission from a turbine or from a park; both the operating point and the background voltage distortion play an important role [24]. Standards and connection agreements do emphasize the calculation of harmonic voltages and/or currents at the point of connection between the park and the public grid [25].…”