特高压直流输电系统非特征谐波分析  

Analysis of non-characteristic harmonic in UHVDC system

作　　者：周国伟[1] 顾用地[1] 周建平[1] 刘德[1] 

机构地区：[1]国网浙江省电力公司检修分公司,浙江杭州310000

出　　处：《电力系统保护与控制》2016年第3期122-128,共7页Power System Protection and Control

摘　　要：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。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 impedance has less influence on AC/DC power system while the lopsided trigger angle indeed has a relatively large influence that AC 5/7 times harmonic currents appear greater, exceeding the current harmonic content maximum standard of 1%.

关 键 词：UHVDC 非特征谐波 换流变阻抗 触发角 PSCAD/EMTDC 

分 类 号：TM721.1[电气工程—电力系统及自动化]