Study on Key Technology of DC-link Capacitor for Flexible HVDC Transmission

ZUO Qianglin; LEI Qiaoshu

doi:10.14044/j.1674-1757.pcrpc.2024.01.015

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Study on Key Technology of DC-link Capacitor for Flexible HVDC Transmission

Key Technologies for the Full⁃chain Localization of Dry DC Capacitor in China | 更新时间：2024-09-14

- Study on Key Technology of DC-link Capacitor for Flexible HVDC Transmission
- Power Capacitor & Reactive Power Compensation Vol. 45, Issue 1, Pages: 108-115(2024)
- 作者机构：
  
  无锡赛晶电力电容器有限公司，江苏　无锡　 214177
- 作者简介：
- 基金信息：
- DOI：10.14044/j.1674-1757.pcrpc.2024.01.015
  CLC：
- Published：2024-02，
  
  Received：07 September 2023，
- 稿件说明：
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ZUO QIANGLIN, LEI QIAOSHU. Study on Key Technology of DC-link Capacitor for Flexible HVDC Transmission. [J]. Power capacitor & reactive power compensation, 2024, 45(1): 108-115.
DOI：

ZUO QIANGLIN, LEI QIAOSHU. Study on Key Technology of DC-link Capacitor for Flexible HVDC Transmission. [J]. Power capacitor & reactive power compensation, 2024, 45(1): 108-115. DOI： 10.14044/j.1674-1757.pcrpc.2024.01.015.

摘要

本文基于柔性直流输电用直流支撑电容器的研发经验，提出直流支撑电容器的纳亨级等效串联电感ESL的测试方法，并验证其正确性，解决了纳亨级电感的测试方法难题；根据测试方法，验证了基于直流支撑电容器引出线方式的纳亨级电感的计算方法，为降低直流支撑电容器纳亨级电感提供了新的设计思路；本文还对直流支撑电容器的老大难问题—极对壳交流局部放电问题，进行研制分析总结，为解决直流支撑电容器的对壳交流局放提供参考；提出了针对极间直流局放研究的建议；结合试验及运行经验，对直流支撑电容器的电流出线端子进行了接触电阻测试、温升试验、小幅值浪涌电流和大幅值浪涌电流的试验验证，试验验证结果表明，只有加厚的细牙圆螺母能通过大幅值浪涌电流试验，这对于提高直流支撑电容器的安全运行很有参考价值。

Abstract

In this paper

the test method of equivalent series inductance (ESL) with nH-level for DC-link capacitor is proposed on the basis of the development experience of DC-link capacitor for flexible DC transmission

its correctness is verified and the difficult problem of testing method for nH-level inductance is solved. The calculation method of nH-level inductance based on DC support capacitor lead line is verified in accordance with the test method

which provides a new design idea for reducing the nH-level inductance of DC-link capacitor. Moreover

the AC partial discharge of pole to enclosure-the perennial problem for the DC-link capacitor

is developed

analyzed and summaried

which provides reference for solving the AC partial discharge to the enclosure of the DC-link capacitor. Some suggestions for the study of DC partial discharge between poles are propsoed. Based on the test and operation experience

the contact resistance test

temperature rise test

small inrush current test and large inrush current test are carried out on the current outgoing terminals of DC-link capacitor. The test verification results show that only the thickened round nut can pass the large inrush current test

which is of great reference value for improving safe operation of DC-link capacitor.

关键词

柔性直流输电直流支撑电容器纳亨级电感局部放电出线端子验证

Keywords

flexible HVDC transmissionDC-link capacitornH-level inductancepartial dischargeoutgoing terminal verification

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