Research Analysis of Domestically Produced DC Dry-type Capacitors on Grid Operation Characteristics and Their Engineering Application

YAO Lulu; YI Chengqian; LIU Gang; MENG Sen; YANG Yun

doi:10.14044/j.1674-1757.pcrpc.2026.04.001

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Research Analysis of Domestically Produced DC Dry-type Capacitors on Grid Operation Characteristics and Their Engineering Application

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Research Analysis of Domestically Produced DC Dry-type Capacitors on Grid Operation Characteristics and Their Engineering Application
全国产直流干式电容器挂网运行特性研究及工程应用分析
CSG Electric Power Research Institute Co., Ltd., Guangzhou 510663, China
National Engineering Research Center of UHV Technology and Novel Electrical Equipment Basis, Kunming 651705, China
Vol. 47, Issue 4, Pages: 1-7(2026)
DOI：10.14044/j.1674-1757.pcrpc.2026.04.001
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YAO Lulu, YI Chengqian, LIU Gang, et al. Research Analysis of Domestically Produced DC Dry-type Capacitors on Grid Operation Characteristics and Their Engineering Application[J]. Power Capacitor & Reactive Power Compensation, 2026, 47(4): 1-7.
DOI：

YAO Lulu, YI Chengqian, LIU Gang, et al. Research Analysis of Domestically Produced DC Dry-type Capacitors on Grid Operation Characteristics and Their Engineering Application[J]. Power Capacitor & Reactive Power Compensation, 2026, 47(4): 1-7. DOI： 10.14044/j.1674-1757.pcrpc.2026.04.001.

摘要

为验证全国产直流干式电容器在柔性直流输电工程中的运行性能，依托昆柳龙直流输电工程龙门换流站，对已连续挂网运行1～2年的20台2.8 kV、9 mF全国产直流干式电容器开展系统性试验研究与解剖分析。围绕电容器长期运行后的电气性能、封装工艺与可靠性，依托本单位特高压电力技术与新型电工装备基础国家工程研究中心电容器评估与可靠性验证平台开展系统评估。研究结果表明，经过长期挂网运行后，全国产直流干式电容器电容量保持稳定，未见显著衰减，介质损耗变化较小，表现出良好的电气稳定性和绝缘性能。对电容器元件开展直流耐压与耐久性试验，结果表明，各元件均满足NB/T 11388—2023标准中的相关要求，元件耐久性明显优于标准规定的500 h考核指标。元件解剖分析结果表明，全国产直流干式电容器在材料匹配、自愈特性及结构设计等方面能够满足柔直工程相关需求，但部分厂家生产的电容器在封装一致性与局部结构应力控制方面仍存在优化空间。全国产直流干式电容器综合性能达到工程化应用要求，具备进一步推广基础，该研究可为高压直流输电工程核心装备国产化提供技术支撑与参考。

Abstract

To evaluate the long-term operating performance and engineering applicability of domestically developed dry-type DC capacitors in flexible DC transmission projects

a systematic investigation was carried out on 20 all-domestic 2.8 kV~9 mF capacitors that had been in continuous service for 1~2 years at the Longmen converter station of the Kunliulong HVDC Transmission Project. The work was organized by the leading project unit and completed on the capacitor evaluation and reliability verification platform of the National Engineering Research Center of UHV Technology and Novel Electrical Equipment Basis. Electrical characteristics

encapsulation condition

and long-term operating reliability of the capacitors were evaluated through whole-unit testing and post-operation disassembly analysis. The results show that the capacitors remained in stable operating condition after long-term field service

with no obvious capacitance degradation and only minor variation in dielectric loss. Good electrical stability and insulation performance were maintained during operation. DC withstand voltage and endurance tests were further conducted on dissected capacitor elements

and all tested samples met the requirements of NB/T 11388—2023. In the endurance test

the operating duration exceeded the 500 h requirement specified in the standard. Further analysis indicates that the domestically developed capacitors can satisfy current engineering application requirements in terms of material compatibility

self-healing behavior

and structural design. Some samples still showed room for improvement in encapsulation consistency and local stress control. Overall

the investigated capacitors demonstrated good operating stability and reliability after field application

providing useful reference for subsequent design improvement

quality evaluation

and engineering application of domestic dry-type DC capacitors in HVDC systems.

关键词

Keywords

references

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