基于结温预估的模块化多电平换流器损耗计算方法  

Calculation Method of Modular Multilevel Converter Power Loss Based on Junction Temperature Estimation

作　　者：黄勇 姚志 王容 苑宾 齐磊 HUANG Yong;YAO Zhi;WANG Rong;YUAN Bin;QI Lei(State Grid Corporation of China UHV Department,Xicheng District,Beijing 100031,China;Ningxia Electric Power Research Institution of SGCC,Yinchuan 750000,Ningxia Hui Automation Region,China;State Grid Shaanxi Electric Power Corporation Overhaul Company,Xi'an 710000,Shaanxi Province,China;State Grid Economic and Technological Research Institute Co.,Ltd.,Changping District,Beijing 102209,China;State Key Laboratory for Alternate Electric Power System With Renewable Energy Resources(North China Electric Power University),Changping District,Beijing 102206,China)

机构地区：[1]国家电网有限公司特高压部,北京市西城区100031 [2]国网宁夏电科院,宁夏回族自治区银川市750000 [3]国网陕西省电力公司检修公司,陕西省西安市710000 [4]国网经济技术研究院有限公司,北京市昌平区102209 [5]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206

出　　处：《电网技术》2019年第11期4115-4124,共10页Power System Technology

摘　　要：随着柔性直流输电工程电压等级和输送容量的提升,模块化多电平换流器的损耗问题变得日益突出。文中基于全桥子模块工作模态分析,提出了全桥子模块的损耗等效分析方法,大大简化了实际工程中全桥拓扑、全半桥混合拓扑结构换流器的损耗计算。接着在固定结温损耗计算方法基础上,提出了结温预估损耗计算方法(简称结温预估方法),并从多种情况(改变系统工况、系统无功、器件开关频率)详细分析了结温预估方法与结温反馈方法的损耗计算相对误差,结果表明结两种计算方法所得结果基本一致,即结温预估方法具有很好的理论可行性。最后,借助于换流阀阀段运行试验平台,开展了阀段损耗测量与分析,验证了所提计算方法的正确性和有效性。相比结温反馈方法,文中所提方法更简洁,计算结果更接近实验测量值,可为高压大容量柔性直流输电系统的损耗评估奠定了基础。With the increase of voltage level and transmission capacity of flexible DC transmission project,the loss of modular multi-level converter becomes more prominent.Based on the working mode analysis of full bridge submodule,one equivalent loss analysis of full bridge submodule is proposed in this paper,which simplifies the loss analysis of full bridge/half bridge hybrid topology in practical engineering.Then based on the calculation method of fixed junction temperature loss,a calculation method of junction temperature prediction loss(referred to as junction temperature estimation method)is proposed,and the details are analyzed from under various conditions(changing system operating conditions,system reactive power,device switching frequency).The relative error between the temperature estimation method and the junction temperature feedback method is calculated.The results show that the difference between the junction temperature estimation method and the junction temperature feedback method is very small.The junction temperature prediction method has good theoretical feasibility.Finally,the valve section loss measurement and analysis are carried out by means o f the valve section of the converter valve,which verified the correctness and effectiveness of the proposed calculation method.Compared with the junction temperature feedback method,the proposed method is more concise,and the calculation result is closer to the experimental measurement value,which can lay a foundation for the loss assessment of the high-voltage large-capacity flexible HVDC transmission system.

关 键 词：模块化多电平换流器 子模块损耗等效分析方法 结温预估 结温反馈 损耗测量 

分 类 号：TM721[电气工程—电力系统及自动化]