摘要
高压直流输电工程在电力系统中的重要性逐渐显现,而随着工程运行年限的不断增加,其在正常环境与极端环境下的可靠性值得深入研究。晶闸管换流阀作为高压直流输电系统的核心设备,评估其可靠性显得尤为重要。晶闸管的失效率是整个直流输电系统可靠性评估的关键参数,其取值决定于所承受的电应力和热应力。本文提出了一种基于应力分析法计算晶闸管失效率的建模方法。首先,建立了换流器关键部件和杂散电容的宽频模型。其次,仿真分析换流阀内不同区域元件的电应力分布,然后建立晶闸管的热阻抗模型,并分析对应的晶闸管的热应力分布。最后,建立了晶闸管可靠性模型,计算了相应的晶闸管的可靠性参数失效率,为进一步定量分析换流阀可靠性提供依据。
The importance of HVDC project in power system gradually appears.With the continuous increase of project operation life,its reliability in normal environment and extreme environment deserves further study.The reliability evaluation of the thyristor converter valve,as the core equipment in HVDC transmission system,appear to be particular important.The failure rate of thyristor is the critical parameter for the overall reliability evaluation,while its value varies depending on the electrical and thermal stress conditions.In this paper,a modeling method for calculating the failure rate of thyristor based on stress analysis is presented.Firstly,the broadband model of the key elements and stray capacitance of the converter is established.Secondly,the electrical stress distribution of different regional components in the converter valve is simulated and analyzed.Then the thermal impedance model of the thyristor is established and the thermal stress of the corresponding thyristor is analyzed.Finally,the reliability model of thyristor is established,and the reliability parameter failure rate of the corresponding thyristor is calculated,which provides the basis for quantitative analysis for further study of the reliability of the converter valve.
作者
梁宁
张志刚
刘翠翠
王丰
卓放
LIANG Ning;ZHANG Zhigang;LIU Cuicui;WANG Feng;ZHUO Fang(Maintenance&Test Center of EHV Power Transmission Company,Guangzhou 510000,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《电力电容器与无功补偿》
北大核心
2019年第4期132-136,144,共6页
Power Capacitor & Reactive Power Compensation
基金
南方电网科技项目(CGYKJXM00000027)
关键词
换流阀
宽频模型
可靠性
参数计算
converter valve
wide band model
reliability
calculation of parameter
