自主可控电容器挂网试运行后状态分析及工艺改进

刘宇飞; 林志辉; 陈宇慧; 王钰涵; 易承乾; 余琼; 李建涛; 韦军; 周春红

doi:10.14044/j.1674-1757.pcrpc.2026.04.002

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自主可控电容器挂网试运行后状态分析及工艺改进

电力电容器与无功补偿 | 聚丙烯薄膜电容器全链条国产化关键技术

自主可控电容器挂网试运行后状态分析及工艺改进
Status Analysis and Process Improvement of Domestically Developed Capacitors After Grid-connected Trial Operation
广东电网有限责任公司广州供电局，广州 510620
南方电网科学研究院有限责任公司，广州 510663
荣信汇科电气股份有限公司，辽宁鞍山 114000
来恩伟业（鹤壁）电子科技有限责任公司，河南鹤壁 458030
宁波碧彩实业有限公司，浙江宁波 315135
桂林电力电容器有限责任公司，广西桂林 541004
2026年47卷第4期页码：8-19
DOI：10.14044/j.1674-1757.pcrpc.2026.04.002
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刘宇飞, 林志辉, 陈宇慧, 等. 自主可控电容器挂网试运行后状态分析及工艺改进[J]. 电力电容器与无功补偿, 2026,47(4):8-19.

LIU Yufei, LIN Zhihui, CHEN Yuhui, et al. Status Analysis and Process Improvement of Domestically Developed Capacitors After Grid-connected Trial Operation[J]. Power Capacitor & Reactive Power Compensation, 2026, 47(4): 8-19.
刘宇飞, 林志辉, 陈宇慧, 等. 自主可控电容器挂网试运行后状态分析及工艺改进[J]. 电力电容器与无功补偿, 2026,47(4):8-19. DOI： 10.14044/j.1674-1757.pcrpc.2026.04.002.

LIU Yufei, LIN Zhihui, CHEN Yuhui, et al. Status Analysis and Process Improvement of Domestically Developed Capacitors After Grid-connected Trial Operation[J]. Power Capacitor & Reactive Power Compensation, 2026, 47(4): 8-19. DOI： 10.14044/j.1674-1757.pcrpc.2026.04.002.

摘要

直流支撑电容器是制约柔性直流输电工程发展的“卡脖子”环节，现有在运工程尚无自主可控电容器的批量应用。对某换流站挂网试运行的多型号自主可控电容器进行解体分析与试验研究，识别缺陷并实施工艺改进，并开展试验方案优化探索。结果表明，挂网前后电容最大衰减率为-0.24%，电气性能无显著劣化；解体及试验揭示元件耐压水平异常，注胶量控制不当，包封件与聚氨酯脱壳，以及聚氨酯存在气泡4类典型缺陷，据此提出金属化膜渐变区错位设计、电容式液面传感注胶监测、包封件表面微纹理处理及真空脱气参数精确控制等改进措施；针对常规参量难以反映电容器老化程度的问题，提出阶梯耐压试验过程的电容变化曲线可有效表征电容器前期老化程度。自主可控电容器通过挂网运行后的状态分析、工艺改进及试验方案优化，其可靠性得到提升，证明了替代进口产品的可行性。

Abstract

DC-link capacitors are a bottleneck restricting the development of VSC-HVDC transmission projects

and there is currently no large-scale appliction of domestically developed capacitors in existing operational projects. Multiple types of domestically produced DC-link capacitors that have undergone gridconnected trial operation at a converter stations are subjected to disassembly analysis and test research

defects are identified

process improvements are implemented

and exploration of test scheme optimization is carried out. The results indicate that the maximum capacitance attenuation rate before and after grid connection is-0.24%

with no significant deterioration in electrical performance. Disassembly and experimental analysis reveals such four typical types of defects as abnormal withstand voltage level of the elements

improper control of potting compound dosage

delamination between the encapsulation shell and the polyurethane

as well as the presence of bubbles within the polyurethane. Accordingly

such corresponding improvement measures as staggered design of the metallized film transition zone

capacitive liquid-level sensing for potting compound monitoring

surface micro-texturing of the encapsulation shell

and precise control of vacuum degassing parameters are proposed. To address the issue that conventional parameters can hardly reflect the aging degree of DC-link capacitors

it is proposed that the capacitance variation curve during the step voltage withstand test can effectively characterize the early aging degree of capacitors. Through the state analysis

process improvements

and test scheme optimization after grid-connected operation

the reliability of the domestically produced DC-link capacitors has been enhanced

proving the feasibility of replacing imported products.

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