Status Analysis and Process Improvement of Domestically Developed Capacitors After Grid-connected Trial Operation

LIU Yufei; LIN Zhihui; CHEN Yuhui; WANG Yuhan; YI Chengqian; YU Qiong; LI Jiantao; WEI Jun; ZHOU Chunhong

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

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Status Analysis and Process Improvement of Domestically Developed Capacitors After Grid-connected Trial Operation

POWER CAPACITOR & REACTIVE POWER COMPENSATION | Key Technologies for the Full-chain Localization of Polypropylene Film Capactors

Status Analysis and Process Improvement of Domestically Developed Capacitors After Grid-connected Trial Operation
自主可控电容器挂网试运行后状态分析及工艺改进
Guangdong Power Grid Co., Ltd., Guangzhou Power Supply Bureau, Guangzhou 510620, China
CSG Electrical Power Research Institute Co., Ltd., Guangzhou 510663, China
Rongxin Huike Electric Co., Ltd., Liaoning Anshan 114000, China
Lion Great Exploit(Hebi)Electronic Technology Co., Ltd., Henan Hebi 458030, China
Ningbo Bicai Industrial Co., Ltd., Zhejiang Ningbo 315135, China
Guilin Power Capacitor Co., Ltd., Guangxi Guilin 541004, China
Vol. 47, Issue 4, Pages: 8-19(2026)
DOI：10.14044/j.1674-1757.pcrpc.2026.04.002
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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：

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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references

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