吴立珠,李晓华,张冬怡,丁晓兵,田庆.励磁涌流下直流50Hz谐波运行特性分析及应用[J].电气自动化,2017,(5):60~64
励磁涌流下直流50Hz谐波运行特性分析及应用
Operating Characteristic Analysis and Application of DC 50Hz Harmonic under the Influence of Magnetizing Inrush Current
  修订日期:2017-05-12
DOI:
中文关键词:  换流变空投  正序二次谐波  50Hz谐波  交流系统强度边界  直流功率边界
英文关键词:no-load commissioning of converter transformer  second harmonic of positive sequence  50Hz harmonic  AC system strength boundary  DC power boundary
基金项目:国家自然科学基金(51377059、51677073)
作者单位
吴立珠 华南理工大学电力学院,广东广州 510640 
李晓华 华南理工大学电力学院,广东广州 510640 
张冬怡 华南理工大学电力学院,广东广州 510640 
丁晓兵 中国南方电网有限责任公司电力调度控制中心,广东广州 510623 
田庆 中国南方电网有限责任公司电力调度控制中心,广东广州 510623 
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中文摘要:
      近几年南方电网发生了多起因换流变压器空投而导致的直流50Hz保护误动事件。针对这个问题,分析励磁涌流下直流中50Hz谐波运行特性的基础上,结合影响规律提出了换流变空投前的交流系统强度边界及直流功率边界。先是分析了不同谐波源下直流50Hz谐波特征,全面梳理了影响换流变涌流谐波的产生和传递的因素;基于PSCAD/EMTDC仿真平台,结合实际直流具体研究了关键因素剩磁、合闸角、交流系统强度以及直流功率对涌流谐波产生的影响,以换流变合闸涌流为谐波源分析了直流功率、直流运行方式、线路长度对直流中50Hz谐波传递特性的影响;最后结合各因素的影响规律,在换流变涌流最严重时,分析得到不使直流逆变侧50Hz保护误动的交流系统强度边界及直流功率边界,为实际工程换流变空投前的系统条件提供参考。
英文摘要:
      A number of DC 50Hz protection malfunctions have occurred in recent years in the Southern Power Grid due to no-load commissioning of the converter transformers. To address this issue, on the basis of an analysis of the operating characteristics of DC 50Hz harmonic under the influence of magnetizing inrusu current and under consideration of influence rules, this paper presents the AC system strength boundary and DC power boundary before no-load commissioning of the converter transformer. Firstly, it analyzes the features of the DC 50Hz harmonic with different harmonic sources, and reviews the factors that affect the generation and transmission of the harmonic caused by inrush current of the converter transformer. Secondly, based on the PSCAD/EMTDC simulation platform and under consideration of the DC power used, it discusses the influence of residual magnetism of key factors, closing angle, AC system strength and DC power upon the generation of inruch current harmonic. Using closing inrush current of the converter transformer as harmonic, it analyses DC power, DC operating mode as well as the influence of line length upon the transfer characteristics of the DC 50Hz harmonic. Finally, under consideration of the influence rules of all these factors, it gives the AC system strength boundary and DC power boundary which can prevent 50Hz protection malfunction on the DC converter side in the case of most serious inrush current of the converter transformer, thus providing reference for the system conditions before no-load commissioning of the converter transformer in actual engineering.
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