| 引用本文: | 余超耘,杨汾艳,盛超,刘正富.高压直流输电线路入口端谐波阻抗特性研究[J].电力系统保护与控制,2018,46(15):93-100.[点击复制] |
| YU Chaoyun,YANG Fenyan,SHENG Chao,LIU Zhengfu.Research on the characteristics of harmonic impedance at the inlet of HVDC transmission line[J].Power System Protection and Control,2018,46(15):93-100[点击复制] |
|
| 摘要: |
| 空充变压器时直流线路沿线的50 Hz谐波分量分布与直流线路入口端谐波阻抗有关。针对直流线路入口端谐波阻抗特性展开详细研究。分析了不同直流运行方式下的直流线路入口端谐波阻抗，定性对比其大小关系。研究了直流线路入口端谐波阻抗的解析等值模型，并基于实际直流系统仿真模型，分别通过解析等值法和测试信号法对不同运行方式下的直流线路入口端谐波阻抗进行计算，验证该解析等值模型的准确性。进一步地，根据计算结果分析直流运行方式对直流线路入口端谐波阻抗大小的影响，所得结论与前文定性分析一致。改变换流器模型中换流变套管杂散电容的大小，研究杂散电容对直流线路入口端谐波阻抗的影响，实现了解析等值模型的简化。 |
| 关键词: 高压直流输电 谐波阻抗 解析模型 直流运行方式 杂散电容 |
| DOI：10.7667/PSPC171092 |
| 投稿时间：2017-07-21修订日期：2017-09-12 |
| 基金项目:广东电网有限责任公司科技项目资助(GDKJQQ20152039) |
|
| Research on the characteristics of harmonic impedance at the inlet of HVDC transmission line |
| YU Chaoyun,YANG Fenyan,SHENG Chao,LIU Zhengfu |
| (Electric Power Research Institute of Guangdong Power Grid Co., Ltd., Guangzhou 510080, China) |
| Abstract: |
| The 50 Hz harmonic component distribution along HVDC transmission line when energizing a no-load transformer is related to the harmonic impedance at the inlet of HVDC line. This paper studies the characteristics of harmonic impedance at the inlet of HVDC transmission line in detail. The harmonic impedances in different operation modes are analyzed and compared with each other qualitatively. The analytical equivalence model of the harmonic impedance is studied, and its accuracy is verified by comparing the calculation results of the analytical method and the test signal method in different operation modes based on the simulation model of an actual HVDC system. Furthermore, the influence of the operation mode on the harmonic impedance is analyzed according to the analytical calculation results, and its conclusion is consistent with the above qualitative analysis. The effect of stray capacitance of the converter transformer casing on harmonic impedance at the inlet of the HVDC transmission line is studied by changing the size of stray capacitance in the converter model, and the equivalence model is simplified. This work is supported by Science and Technology Project of Guangdong Power Grid Limited Liability Company (No. GDKJQQ20152039). |
| Key words: HVDC harmonic impedance equivalence model DC operation mode stray capacitance |
