基于绝对延时的DCCT异地同步现场校准方法及不确定度研究  

Research on field calibration method and uncertainty of DCCT remote synchronization based on absolute delay

作　　者：朱梦梦 林聪 曹敏 罗强 朱全聪 田鑫萃[3] Zhu Mengmeng;Lin Cong;Cao Min;Luo Qiang;Zhu Quancong;Tian Xincui(Electric Power Research Institute of Yunnan Power Grid Co. , Ltd. , Kunming 650217, China;Jiangsu Ling Chuang Electric Automation Co. , Ltd. , Zhenjiang 212009, Jiangsu, China;Faculty of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650051, China)

机构地区：[1]云南电网有限责任公司电力科学研究院,昆明650217 [2]江苏凌创电气自动化股份有限公司,江苏镇江212009 [3]昆明理工大学电力工程学院,昆明650051

出　　处：《电测与仪表》2019年第8期51-56,63,共7页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(51807084);中国南方电网公司科技项目(YNKJ00000124)

摘　　要：直流电流互感器(DCCT)的准确性合格与否是其状态评估及现场投产验收的重要依据,对直流输电保护控制的稳定运行起着极其重要作用。因此本文分析了目前直流电流互感器现场应用情况,就现场校准方法存在的问题,提出一种基于绝对延时的DCCT异地同步现场校准方法,开展了DCCT绝对延时的测试方法研究,解决了一直以来开环异步、人工计算造成的准确度及效率低的问题。文章构建了高准确度直流互感器现场异地同步校准系统及不确定度分析模型,确保了可信度。所述方法在实验室中得到了验证,并开展了±500kV永富直流工程直流电流互感器现场校验工作,为我国换流站DCCT现场校准提供参考依据。The accuracy of the DC current transformer (DCCT) is an important basis for its status assessment and on-site commissioning and acceptance, and plays an extremely important role in the stable operation of DC transmission protection control. Therefore, the principle and field application of DC current transformer are analyzed, and in view of the existing problems on the field calibration method, a new method of DCCT synchronous calibration in different places based on absolute delay is proposed in this paper, and the research on the test method of DCCT absolute delay is carried out, which the problem of accuracy and efficiency caused by open-loop asynchronous and manual calculation has been solved. In this paper, the synchronous calibration system and uncertainty analysis model of DC transformer with high accuracy are constructed, which ensures its reliability. The proposed test method is verified in the laboratory, and the on-site calibration work of the DC current transformer in the ±500 kV YongFu DC project is carried out, which provides a reference for the DCCT calibration of the converter station in China.

关 键 词：异地同步 绝对延时 交错并联 不确定度 直流分量 

分 类 号：TM89[电气工程—高电压与绝缘技术]