| 引用本文: | 薛士敏,陈 硕,顾 诚,陈 萧.一种基于暂态量的柔性直流系统保护及雷击识别方法[J].电力系统保护与控制,2022,50(9):45-53.[点击复制] |
| XUE Shimin,CHEN Shuo,GU Cheng,CHEN Xiao.A method for protection and lightning identification in a flexible DC systembased on transient quantities[J].Power System Protection and Control,2022,50(9):45-53[点击复制] |
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| 摘要: |
| 暂态量保护伴随着柔直技术的发展迎来了国内外研究的热潮，当前保护动作速度的研究进展已趋近于极限。而保护识别速度的提高必然伴随着可靠性的降低，所以，如何在保证速动性要求下提高保护的可靠性是重中之重。远距离输电工程中雷击发生较为频繁，在不引起闪络的情况下，其作为一种干扰源是不容忽略的。基于此原因，利用希尔伯特黄变换设计了一种高频保护方案，同时利用雷电波波形特征提出了一种雷击干扰识别方法。之后，将雷击判据与保护判据相结合，以弥补暂态量保护的不足，提高其可靠性。最后，在PSCAD仿真平台中搭建张北四端柔直系统以及雷电流模型完成保护方法的验证。经验证，所设计保护方法可以准确识别故障极和区内外故障，且不会因雷击干扰而误动，同时保护具备较高的耐过渡电阻能力。 |
| 关键词: 柔性直流输电 暂态量保护 雷击干扰 高频保护 可靠性 |
| DOI：DOI: 10.19783/j.cnki.pspc.210990 |
| 投稿时间：2021-07-30修订日期：2021-09-08 |
| 基金项目:国家电网有限公司总部科技项目资助(KJ21- 1-66) |
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| A method for protection and lightning identification in a flexible DC systembased on transient quantities |
| XUE Shimin,CHEN Shuo,GU Cheng,CHEN Xiao |
| (Key Laboratory of Smart Grid of Ministry of Education (Tianjin University), Tianjin 300072, China) |
| Abstract: |
| With the development of flexible and straightening technology, transient protection has ushered in an upsurge of research at home and abroad, and the current research progress of protection action speed has approached its limit. The improvement of protection recognition speed will inevitably be accompanied by a decrease of reliability. So how to improve the reliability of protection under the requirement of ensuring quick motion is the most important thing. Lightning strikes occur frequently in long-distance power transmission projects, and they cannot be ignored as a source of interference without causing flashover. For this reason, this paper uses the Hilbert Huang transform to design a high-frequency protection scheme. At the same time, it uses the characteristics of the lightning wave to propose a lightning interference identification method. Then the lightning strike and protection criteria are combined to make up for the shortcomings of transient protection and improve its reliability. Finally, the Zhangbei four-terminal flexible DC system and the lightning current model are built in the PSCAD simulation platform to complete the verification of the protection method. It has been verified that the protection method designed in this paper can accurately identify fault poles and internal and external faults, and will not malfunction because of lightning interference. At the same time, the protection has a high resistance to transition resistance.
This work is supported by the Science and Technology Project of the Headquarters of State Grid Corporation of China (No. KJ21-1-66). |
| Key words: flexible DC transmission transient protection lightning interference high-frequency protections reliability |
