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文章摘要
金属化薄膜电容器在模块化多电平换流器工况下温升特性分析
Analysis of Temperature Rise Characteristic of Metallized Film Capacitor at Operating Conditions in Modular Multi-level Converter
Received:May 28, 2018  Revised:May 28, 2018
DOI:10.19753/j.issn1001-1390.2019.015.003
中文关键词: 金属化膜电容器  模块化多电平换流器  温度场
英文关键词: metallized film capacitor  modular multi-level converters  temperature field
基金项目:柔直换流阀轻型化关键技术研究
Author NameAffiliationE-mail
GUO Xiaofan* State Key Lab of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University 13269178825@163.com 
ZHA Kunpeng E-PRI Electric Power Engineering Co Ltd 13269178825@163.com 
CAO Junzheng E-PRI Electric Power Engineering Co Ltd 13269178825@163.com 
TANG Zhiguo State Key Lab of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University 13269178825@163.com 
QU Haitao E-PRI Electric Power Engineering Co Ltd 13269178825@163.com 
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中文摘要:
      自愈式金属化薄膜电容器由于储能密度高、寿命长、可靠性高而被广泛应用于模块化多电平换流器(MMC)中,温度作为电力电容器寿命与稳定性的主要影响因素成为研究热点。本文基于实际柔性直流输电工程,分析电容器在其运行工况下的热应力。在COMSOL有限元仿真软件中建立金属化薄膜电容器三维温度场仿真模型,对其运行时的温升特性进行研究分析,并进行了试验验证。根据研究结果,金属化膜电容器在MMC换流器子模块中所承受的电流应力和电压应力是相对复杂的交、直流相互叠加的复合变量;电容器最热点位于元件内部,最高温升为11.1℃,外壳温度最热点在侧面,最高温升为7.75℃。为金属化薄膜电容器在MMC换流器中的运行维护提供了参考。
英文摘要:
      Self-healing metallized film capacitor is widely used in modular multilevel converters (MMC), owing to its high power density, long life, high reliability. Temperature become a hot research topic as the main influencing factors of the stability and life of power capacitor. Based on actual engineering practice of VSC-HVDC, this paper has discussed the thermal stress of capacitor in its operating condition. A 3D temperature field model of metallized film capacitor is formulated based on finite element simulation tool COMSOL, and the temperature rise characteristics of the metallized film capacitor were analyzed and tested. According to the research results, the current stress and voltage stress of the metallized film capacitor in the MMC converters are relatively complex compound variables; The most hot spot is inside the element, the highest temperature rise is11.1℃ , the most hot spot of the shell is on the side, and the highest temperature rise is7.75℃. It provides reference for the operation and maintenance of the metallized film capacitor in the MMC converters.
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