Study on Equivalent Methods for Thermal Stability Test of High-voltage and High-capacity Flexible DC Capacitors

WANG Tingting; WANG Zhongao; YAO Cheng; MA Zhiqin; HU Taishan; LIAO Zihao; LIU Gang; LI Qian

doi:10.14044/j.1674-1757.pcrpc.2025.05.009

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Study on Equivalent Methods for Thermal Stability Test of High-voltage and High-capacity Flexible DC Capacitors

Capacitor | 更新时间：2025-10-30

- Study on Equivalent Methods for Thermal Stability Test of High-voltage and High-capacity Flexible DC Capacitors
- Power Capacitor & Reactive Power Compensation Vol. 46, Issue 5, Pages: 85-90(2025)
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- DOI：10.14044/j.1674-1757.pcrpc.2025.05.009
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- Received：12 May 2025，
  
  Published：25 October 2025
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WANG Tingting, WANG Zhongao, YAO Cheng, et al. Study on Equivalent Methods for Thermal Stability Test of High-voltage and High-capacity Flexible DC Capacitors[J]. Power Capacitor & Reactive Power Compensation, 2025, 46(5): 85-90.
DOI：

WANG Tingting, WANG Zhongao, YAO Cheng, et al. Study on Equivalent Methods for Thermal Stability Test of High-voltage and High-capacity Flexible DC Capacitors[J]. Power Capacitor & Reactive Power Compensation, 2025, 46(5): 85-90. DOI： 10.14044/j.1674-1757.pcrpc.2025.05.009.

摘要

柔直输电工程核心器件的柔直电容器的可靠性和寿命直接影响换流阀运行年限，柔直电容器运行过程中需承受复杂的运行工况，研究薄膜及电容器在全工况的等效试验方法，用以评估柔直电容器长期耐久性能十分重要。本文通过电热耦合仿真计算电容器单元稳态发热特性，确定内部热点位置在整体中上区域电容器元件内部，外壳热点位置在大面中上区域。提出用工频等效谐波热损耗的方法，提出改进的电容器热稳定试验方法，增加了陪试品及电容器内部的测温热电偶。通过加速老化试验明确电容器电容量、ESR衰减规律，确定电容器加速因子并提出了加速试验判据。

Abstract

The reliability and lifespan of flexible DC capacitors，the core components in flexible DC transmission projects，directly impact operational duration of the converter valves. The flexible DC capacitors in operation are subjected to complex operation conditions. Therefore，it is crucial to study the equivalent testing methods for films and capacitors under full working conditions to assess the long-term durability of the flexible DC capacitors. In this paper，the steady-state thermal characteristics of the capacitor unit are calculated through electro-thermal coupling simulation，identifying that the internal hotspot is located within the capacitor element in the upper-middle region of the unit，while the external hotspot is situated in the upper-middle area of the large surface. A method using power frequency equivalent harmonic thermal loss is proposed，along with an improved thermal stability test method for capacitors，which includes additional thermocouples for temperature measurement in both test samples and internal parts of the capacitors. Through accelerated aging tests，the decay of the capacitor's capacitance and ESR are clarified，the acceleration factor of the capacitor is determined，and the criteria for accelerated testing is proposed.

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