| 引用本文: | 周国伟,顾用地,周建平,刘德.特高压直流输电系统非特征谐波分析[J].电力系统保护与控制,2016,44(3):122-128.[点击复制] |
| ZHOU Guowei,GU Yongdi,ZHOU Jianping,LIU De.Analysis of non-characteristic harmonic in UHVDC system[J].Power System Protection and Control,2016,44(3):122-128[点击复制] |
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| 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。 |
| 关键词: UHVDC 非特征谐波 换流变阻抗 触发角 PSCAD/EMTDC |
| DOI：10.7667/PSPC150593 |
| 投稿时间：2015-04-10修订日期：2015-09-11 |
| 基金项目: |
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| Analysis of non-characteristic harmonic in UHVDC system |
| ZHOU Guowei,GU Yongdi,ZHOU Jianping,LIU De |
| (Maintenance Company of State Grid Zhejiang Electric Power Company, Hangzhou 310000, China) |
| Abstract: |
| 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%. |
| Key words: UHVDC non-characteristic harmonic converter transformer impedance trigger angle PSCAD/EMTDC |
