文章摘要
基于最小二乘法的线路录波数据同步及故障测距
Time synchronization method based on least square method of line fault recording data for fault location
投稿时间:2020-02-12  修订日期:2020-03-23
DOI:
中文关键词: 时间同步  故障录波  最小二乘法  故障测距
英文关键词: time synchronization  recorded fault data  the least squares method  fault location
基金项目:国家重点研发计划项目资助(2016YFB0101900);广东电网公司科技项目 (GDKJXM20162205) 基于故障录波信息的电网故障快速诊断技术研究及高级功能应用
作者单位邮编
赵阳 新能源电力系统国家重点实验室(华北电力大学) 102200
肖仕武 新能源电力系统国家重点实验室(华北电力大学) 102200
焦邵麟 广东电网有限责任公司电力调度控制中心 510000
刘玮 广东电网有限责任公司电力调度控制中心 510000
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中文摘要:
      高压输电线路两侧故障录波装置由于自身子时钟存在误差,导致二者采集到的录波数据在时间上不同步,利用该数据进行故障测距的结果精度较差,无法为排除故障提供便利。为了充分利用故障录波数据,需对两端录波数据进行同步处理。文章阐述了目前工程中采用的差流法、相位法和启动时刻对时法原理及步骤,对其各自的性能进行了对比分析,在此基础上提出了一种基于最小二乘法,利用线路参数实现两端录波数据同步的方法,并将其应用于故障测距。通过PSCAD仿真数据和实际故障录波数据的验证可知利用最小二乘法对故障录波数据进行同步后,故障测距误差降低至1%,大大提升了结果的可靠性和可信性。
英文摘要:
      The fault record data collected by the devices of both sides of transmission line, owing to the error in the sub clock, is asynchronous. The results of subsequent analysis based on the unprocessed fault record data, especially the fault location, can not meet the requirement of accuracy, especially the fault location, failing to provide guidance for fault resolution. To make full use of fault record data, time synchronization of recorded data is very necessary. Firstly, three methods currently commonly used in engineering are shown, at the same time, the principle and limitations of every method are discussed. Secondly, the transmission line with lumped parameters model is established, a method based on least squares, using the parameters and recorded data of the transmission, is proposed. Finally, the simulative results demonstrate that the time synchronization method based in least squares can achieve high accuracy in fault location, and improve reliability of subsequent analysis results.
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