南方电网科学研究院有限责任公司，广州 510663
特高压电力技术与新型电工装备基础国家工程研究中心，昆明 651705
收稿：2026-05-06，
修回：2026-07-22，
纸质出版：2026-08-25
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姚露露, 易承乾, 刘刚, 等. 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[J]. 电力电容器与无功补偿, 2026,47(4):1-7.
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.
姚露露, 易承乾, 刘刚, 等. 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[J]. 电力电容器与无功补偿, 2026,47(4):1-7. DOI： 10.14044/j.1674-1757.pcrpc.2026.04.001.
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.
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。
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.
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电力电子电容器:GB/T 17702—2021[S]. 2021.
Power electronic capacitors:GB/T 17702——2021[S]. 2021.
Capacitors for power electronics:IEC 61071:2017[S]. 2017.
柔性直流输电换流阀用直流支撑电容器:NB/T 11388—2023[S]. 2023.
DC support capacitor for flexible DC transmission converter valve :NB/T 11388—2023[S]. 2023.
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