模块化多电平换流器操作过电压分析

发布时间：2018-06-07 11:16

本文选题：模块化多电平换流器 + 操作过电压　；参考：《高电压技术》2017年04期

【摘要】：模块化多电平换流器(MMC)是高压大容量柔性直流(VSC-HVDC)输电工程的核心,换流器设备的参数设计和型式试验需要基于其暂态过电压的分析结果。为此,提出了模块化多电平换流器的操作过电压计算模型。基于±500 k V柔性直流输电工程的系统参数,研究了模块化多电平换流器设备的设计参数对操作过电压的影响,包括避雷器、桥臂电抗器和子模块储能电容器。结果表明:对于模块化多电平换流器,操作过电压分析中起决定作用的故障工况是换流器交流出口单相接地故障、换流器直流出口单极接地故障、和换流器交流出口相间短路故障;避雷器的荷电率增加时,模块化多电平换流器交流侧相对地、直流侧极对地和桥臂端间的最大操作过电压幅值降低;桥臂电抗器的电感值增加时,模块化多电平换流器的交流侧相对地最大操作过电压幅值降低;子模块储能电容器的电容值增加时,模块化多电平换流器直流侧极对地最大操作过电压幅值增加。研究结果可为柔性直流输电工程换流器的设计和试验提供参考。
[Abstract]:Modularized multilevel converter (MMC) is the core of high voltage and large capacity flexible DC / VSC-HVDC-based transmission project. The parameter design and type test of converter equipment need to be based on the analysis results of transient overvoltage. Therefore, the operating overvoltage calculation model of modularized multilevel converter is proposed. Based on the system parameters of 卤500kV flexible DC transmission project, the influence of the design parameters of modularized multilevel converter equipment on the operating overvoltage is studied, including the arrester, the bridge arm reactor and the sub-module energy storage capacitor. The results show that for the modularized multilevel converter, the fault condition that plays a decisive role in the analysis of operating overvoltage is the single-phase grounding fault at the AC outlet of the converter, and the single-pole grounding fault at the DC outlet of the converter. When the charging rate of the arrester increases, the AC side of the modularized multilevel converter decreases the maximum operating overvoltage amplitude between the DC side and the bridge arm. When the inductance of the bridge arm reactor increases, the AC side of the modularized multilevel converter decreases relative to the maximum operating overvoltage amplitude, while the capacitance of the sub-module energy storage capacitor increases. Modularized multilevel converter DC side pole to the ground maximum operating overvoltage amplitude increase. The results can be used as a reference for the design and test of HVDC converters.
【作者单位】：全球能源互联网研究院;先进输电技术国家重点实验室;大功率电力电子北京市重点实验室;
【基金】：国家电网公司科技项目(SGRIZLKJ[2015]1193号)~~
【分类号】：TM721.1;TM46

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