Research On Harmonic Influence From HVDC Converter Station To A Wind Farm At Close Distance

The study of this paper focus on the harmonic transforming from LCC-HVDC system to the wind farm,which supported by the actual project and a large number of literature books and based on the application scenario of LCC-HVDC system with a large-scale wind farm nearby.The research content of this paper is divided into three parts:in the first part,my study focus on the harmonic transmission in LCC-HVDC system,which including characteristic harmonic and non-characteristic harmonic.Because the research content of this paper is the harmonic transforming from LCC-HVDC system to wind farm,so the analysis of non-characteristic harmonic focus on the harmonic coming from LCC-HVDC system DC side to AC side,studying on the impact of the AC system.Finally,there are some harmonic suppression measures put forward;in the second part,my study focus on the harmonic transmission in a AC system which between LCC-HVDC system and its close wind farm,which first building the equivalent model by the AC system considering the influence of the transformer saturation and the transmission line parameters,then analyzing harmonic amplification produced in the ac system and finally and putting forward the measures to restrain harmonics;in the final part,my study focus on the harmonic transmission in DFIG wind farm and PMSG wind farm,which analyzing the impact of the background harmonic on wind farm and putting forward measures to restrain the harmonics.Finally,the wind farm system harmonic impedance frequency characteristic were analyzed and suppression measures are put forward.To sum up,this paper has a comprehensively analysis of the harmonic characteristic transforming from LCC-HVDC system to wind farm,and gives the measures to restrain harmonics,which can be a reference of engineering application in the future.