【作者】 陆海清； 陶佳； 宁康红； 丘文千； 周浩； 毛昭磊；

【Author】 LU Hai-qing;TAO Jia;NING Kang-Hong;QIU Wen-qian;ZHOU Hao;Mao Zhao-leil;Electrical Engineering,Zhejiang University;Zhejiang Electric Power Design Institute;

【机构】 浙江大学电气工程学院； 浙江省电力设计院；

【摘要】 随着特高压直流输电的广泛应用,因直流电流引起的直流偏磁问题也越来越受到相关部门的重视。本文研究了交流系统直流电流产生的原理,提出将整个系统分成地上、地下两部分进行求解,通过变电站中性点电位及流过的电流将两部分联系起来。本文以浙西换流站为例,计算了单极运行时,换流站附近变电站中性点的直流电流。根据直流电流分布情况,通过励磁曲线的简化,推导出了可以应用于工程实践的各次谐波含量的峰值简化计算公式。最后,通过MATLAB计算,分析了各次谐波的变化规律。更多还原

【Abstract】 With HVDC transmission widely used,DC bias problem caused by DC current is more and more highly regarded by relevant departments.This paper does research on the principle generated by the DC current of the AC system,and proposes a method that the whole system divides into aerial part and underground part,which linked by substation neutral point potential and the current flow through the neutral point.Taking western Zhejiang converter station as an example,the paper calculates the DC current in the neutral point of the transformer near the converter station.Through the simplification of excitation curve,the article deduces a simplified formula which can be applied to engineering practice to calculate the peak of each harmonic.At last,the article analyses the variation of each harmonic using MATLAB.更多还原