特高压直流输电系统非特征谐波分析

特高压直流输电（UHVDC）以其特有的大容量、远距离、高电压等优点,在国内迅速发展起来。针对特高压直流输电系统普遍存在的网侧非特征谐波电流问题,展开了一系列的研究。首先理论分析了特高压换流变阻抗不平衡和触发角不平衡时,5、7次等非特征谐波电流的产生。其次,根据国内某一实际的UHVDC相关运行参数,以PSCAD/EMTDC软件为平台,搭建了其仿真分析模型。最后,重点针对换流变阻抗不平衡和触发角不平衡两种情况,计算了网侧5、7次非特征谐波电流。仿真结果表明,换流变阻抗不平衡对交直流互联系统的影响较小;换流器触发角不平衡时,网侧5、7次非特征谐波电流较大,超出了谐波电流含量最大1%的标准,对交直流互...

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Bibliographic Details
Published in电力系统保护与控制 Vol. 44; no. 3; pp. 122 - 128
Main Author 周国伟 顾用地 周建平 刘德
Format Journal Article
LanguageChinese
Published 国网浙江省电力公司检修分公司,浙江杭州,310000 2016
Subjects
PSCAD/EMTDC
UHVDC
换流变阻抗
触发角
非特征谐波
非特征谐波
trigger angle
换流变阻抗
PSCAD/EMTDC
触发角
non-characteristic harmonic
UHVDC
converter transformer impedance
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Summary:特高压直流输电（UHVDC）以其特有的大容量、远距离、高电压等优点,在国内迅速发展起来。针对特高压直流输电系统普遍存在的网侧非特征谐波电流问题,展开了一系列的研究。首先理论分析了特高压换流变阻抗不平衡和触发角不平衡时,5、7次等非特征谐波电流的产生。其次,根据国内某一实际的UHVDC相关运行参数,以PSCAD/EMTDC软件为平台,搭建了其仿真分析模型。最后,重点针对换流变阻抗不平衡和触发角不平衡两种情况,计算了网侧5、7次非特征谐波电流。仿真结果表明,换流变阻抗不平衡对交直流互联系统的影响较小;换流器触发角不平衡时,网侧5、7次非特征谐波电流较大,超出了谐波电流含量最大1%的标准,对交直流互联系统的影响较大。
Bibliography:UHVDC; non-characteristic harmonic; converter transformer impedance; trigger angle; PSCAD/EMTDC
ZHOU Guowei, GU Yongdi, ZHOU Jianping, LIU De （Maintenance Company of State Grid Zhejiang Electric Power Company, Hangzhou 310000, China）
41-1401/TM
Ultra High Voltage Direct Current （UHVDC） has a rapid development in China by means of its special large capacity, long distance, high voltage and so on. This paper carries out a series of research on AC non-characteristic harmonic currents of UHVDC system. Firstly, it theoretically analyzes the appearance of 5/7 times non-characteristic harmonic currents at the unbalanced converter transformer impedance and trigger angle of UHVDC. Then, according to a real domestic UHVDC operation parameter, a simulation module is established by PSCAD/EMTDC. Finally, aiming at two major cases that the unbalanced converter transformer impedance and trigger angle of UHVDC, it calculates the AC 5/7 times harmonic currents. The simulation results show that the unbalance converter transformer
ISSN:1674-3415
DOI:10.7667/PSPC150593