摘要
柔性直流输电系统的功率模块众多,功率模块的故障率较高且容易引起设备的损坏,换流阀的在线监测系统是保证系统安全运行的关键设备。分析了MMC拓扑结构与器件的热阻模型,给出了损耗、结温的预测方法,通过Lesit寿命模型和线性损伤累积理论对模块寿命耗损进行研究。通过对换流阀子模块的电容电压、开关频率、温度及寿命等运行参数的在线监测实时分析并预测换流阀的运行状态。最后,设计了在线监测系统的样机并进行了实验测试,给出了仿真与实验结果。
There are many power modules in the flexible dc transmission system.The failure rate of the power modules is high and it is easy to cause equipment damage.The on-line monitoring system of the converter valve is the key equipment to ensure the safe operation of the system.The thermal resistance model of MMC topology and devices is analyzed,the prediction methods of loss and junction temperature are given,and the module life loss is studied by Lesit life model and linear damage accumulation theory.The operating state of the converter valve is analyzed and predicted by on-line monitoring the operating parameters such as capacitance voltage,switching frequency,temperature and life of the converter valve submodule.Finally,a prototype of on-line monitoring system is designed and tested,and the simulation and experimental results are given.
作者
周竞宇
赵宇
胡雨龙
任成林
徐洪全
ZHOU Jing-yu;ZHAO Yu;HU Yu-long;REN Cheng-lin;XU Hong-quan(CSG EHV Power Transmission Company,Guangzhou 510663,China;Tbea Xinjiang Sunoasis Co.,Ltd.,Xi’an 710075,China)
出处
《自动化与仪表》
2021年第6期61-66,73,共7页
Automation & Instrumentation
基金
南方电网公司科技计划项目(0100002019010706WD00026)。
关键词
柔性直流输电系统
功率模块
结温
热阻模型
在线监测
flexible DC transmission system
power modules
junction temperature
thermal resistance models
on-line monitoring system
