Mechanism and Suppression Techniques for Initial Current Imbalance Caused by Parasitic Capacitance in Capacitor Bank

ZHAO Yanjun; WEI Wenwen; YANG Yinhe; QIU Xiaofeng

doi:10.14044/j.1674-1757.pcrpc.2026.01.004

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Mechanism and Suppression Techniques for Initial Current Imbalance Caused by Parasitic Capacitance in Capacitor Bank

POWER CAPACITOR & REACTIVE POWER COMPENSATION | Reactive Power Compensation and Filter

Mechanism and Suppression Techniques for Initial Current Imbalance Caused by Parasitic Capacitance in Capacitor Bank
电容器组寄生电容致初始电流失衡机理与抑制技术
Wuxi Sunking Power Capacitor Co., Ltd., Jiangsu Wuxi 214100, China
Vol. 47, Issue 1, Pages: 28-34(2026)
DOI：10.14044/j.1674-1757.pcrpc.2026.01.004
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ZHAO Yanjun, WEI Wenwen, YANG Yinhe, et al. Mechanism and Suppression Techniques for Initial Current Imbalance Caused by Parasitic Capacitance in Capacitor Bank[J]. Power Capacitor & Reactive Power Compensation, 2026, 47(1): 28-34.
DOI：

ZHAO Yanjun, WEI Wenwen, YANG Yinhe, et al. Mechanism and Suppression Techniques for Initial Current Imbalance Caused by Parasitic Capacitance in Capacitor Bank[J]. Power Capacitor & Reactive Power Compensation, 2026, 47(1): 28-34. DOI： 10.14044/j.1674-1757.pcrpc.2026.01.004.

摘要

本文针对某高压滤波电容器组桥式差电流保护验收试验异常展开研究。分析表明，台架奇数串电容器布置导致固定电位点两侧寄生电容不对称，引发耦合电流偏差使不平衡电流超标。提出调整主电容与寄生电容调平两种方案，后者因施工周期短、成本低更具优势。通过量化分析不同层位固定电位点调整对不平衡电流的影响，筛选优化方案并现场验证，调整电容器层间固定电位点布置可均衡寄生电容分布，使不平衡电流达标。研究创新提出寄生电容调平技术，经理论与实践验证，为高压直流输电工程用电容器组不平衡保护调试提供可复制技术方案，兼具显著工程效益与应用价值。

Abstract

In this paper the abnormality encountered during the acceptance test of bridge-type differential current protection for a high-voltage filter capacitor bank is studied. The analysis shows that the odd-numbered string arrangement of capacitors on the rack causes asymmetric parasitic capacitance on both sides of fixed potential points，triggering coupling current deviation and leading to excessive unbalanced current. Such two solutions as main capacitance adjustment and parasitic capacitance balancing are proposed，with the latter favored for its shorter construction period and lower cost. An optimized scheme is screened and validated on-site through quantitative analysis of the impact of adjusting fixed potential points at different levels on the unbalanced current. The adjustment of interlayer fixed potential point arrangements can balance parasitic capacitance distribution and ensure the unbalanced current to meet standards. This study innovatively proposes a parasitic capacitance balancing technique which，through theoretical and empirical combination，provides a replicable technical solution for unbalanced protection debugging in HVDC capacitor banks and offers both significant engineering benefits and application value.

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references

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