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介绍实际工程中所用的直流滤波器的形式并讨论其参数的选择方式,同时介绍用于评价直流滤波器设计性能指标的等效干扰电流Ieq以及用于计算Ieq的三脉动谐波模型。以目前在研待建的云广特高压直流工程为例,利用Siemens公司的谐波分布计算程序HarmDistr进行计算,讨论分析各种因素对Ieq的影响。最后针对不同的直流系统运行工况、不同的直流滤波器的投切组合进行直流滤波器性能计算,比较Ieq的大小并进行分析讨论。
This paper introduces the form of DC filter used in practical engineering and discusses its parameter selection method. At the same time, it introduces the equivalent interference current Ieq used to evaluate the design performance of DC filter and the three-pulse harmonic model used to calculate Ieq. Taking the Yun-Guang UHVDC project currently under construction as an example, HarmDistr, which is a harmonic distribution calculation program of Siemens Corporation, is used to analyze and analyze the influence of various factors on Ieq. Finally, different DC system operating conditions, different DC filter switching combinations of DC filter performance, compare Ieq size and analysis and discussion.