适用于大型风力发电站的多源非特征谐波的叠加效应算法

Multiple Non-characteristic Harmonic Superposition Algorithm Applicable for Large Wind Power Plant

在大规模集中式接入的风电场/光伏电场在电网中造成的谐波污染,实质上是所有单台换流器所产生谐波的集合,为避免分析研究的结果过于夸大或乐观,必须考虑每一单一谐波源所产生的非特征谐波电流相量的相位呈一定的随机分布特性。提出了建立在概率分析基础上的两种新手段,Rayleigh电流等效法与Ray-leigh电压等效法,可以有效地使此类多源谐波集合效应的分析估算结果更加逼近实测。运用这两种算法和IEC标准所推荐的算法对某风电站作了计算,通过对比各种方法得出的结果,检验了新方法的有效性和合理性。

The harmonic interference in the wind farm/photovoltaic power plant of large-scale centralized access is factually the collection of harmonics generated by individual electronic converter.In order to avoid the exaggerated or too optimistic analysis results,it is necessary to analyze the random distribution of the phasor phase of non-characteristic harmonic currents generated by every single harmonic source.In this paper,two methods based on probability analysis were proposed,i.e.Rayleigh current approximation and Rayleigh voltage approximation,which could effectively make the analysis results based on the collection of multi-harmonic effects more realistic.A check calculation of a wind power plant was made using the two methods proposed above and the algorithm recommend by IEC standard.Through comparing the results from different methods,the validity and rationality of the novel methods were verified.