Decompositions of harmonic propagation in wind power plant

• Decomposition between primary and secondary emission in wind power plants.
• Propagation characteristics of primary and secondary emission.
• The impact of resonance and damping of the grid.
• Case of emission from turbines, at different production levels, from public grid.
• Impact of a turbine filter on the propagation.

This paper presents harmonic propagation in a wind power plant. The two groups of propagation are distinguished based on the harmonic sources: propagation from one individual wind turbine to other turbines and to the public grid; and propagation from the public grid to the collection grid and to individual wind turbines. The paper studies the characteristics of the different harmonic propagation paths. A case with emission from all turbines, at different production levels, and from the public grid is presented as well. Also the impact of a turbine filter on the propagation is studied. The study indicates that, resonances of a wind power plant have a significant impact on the propagation. It is also shown that harmonic studies should consider both emission originating from turbines and emission originating from the public grid. It is also shown that the filter with the turbine has a significant impact on the harmonic propagation.