摘要
首先给出了交流系统各主要元件谐波频率下的数学模型,利用Ward多端等值法推导出多馈入直流输电系统各直流接入点在谐波频率下的节点导纳矩阵,进而可以得到各直流接入点的谐波电压。对上海电网500k V电压等级电网进行了等值并通过计算得到不同运行方式下各直流接入点的电压总谐波畸变率的范围,经分析可知上海地区多馈入直流输电系统谐波相互影响很小,各直流接入点电压的畸变主要受自身直流线路谐波的影响。
Firstly,this paper introduces the harmonic mathematical model of the major components in the AC transmission system. The Ward multi-terminal equivalence method was used to get the node admittance matrix of the access points with DC link in the MIDC system. With the known current spectrum,the harmonic voltages of the access points with DC link can be calculated. At last the THDuof the access points with DC link can be counted out.The 500 k V voltage level network in Shanghai grid was made in equavalent based on the harmonic models. Then the ranges of the total harmonic distortion of voltage（ THDu） for the access points with DC link were calculated. The conclusion based on the analysis is that the harmonic interaction between the DC access points of the multi-infeed DC system in Shanghai district is very weak. The THDuof the access point with DC link is mainly effected by the harmonics fed by the DC circuit linked to the access point.
出处
《电工电能新技术》
CSCD
北大核心
2016年第1期42-47,共6页
Advanced Technology of Electrical Engineering and Energy
关键词
多馈入直流输电
谐波影响
数学模型
Ward多端等值法
电压总谐波畸变率
multi-infeed DC
harmonic effects
mathematical model
Ward multi-terminal equivalence
total harmonic distortion of voltage
