电器与能效管理技术 ›› 2021, Vol. 0 ›› Issue (10): 13-17.doi: 10.16628/j.cnki.2095-8188.2021.10.003

• 研究与分析 • 上一篇    下一篇

基于最小二乘法线性相关系数的短路电流频率测量及零点预测方法

邹德维1, 王连铁2, 孟宇3, 马少华1   

  1. 1.沈阳工业大学 电气工程学院, 辽宁 沈阳 110870
    2.应急管理部沈阳消防研究所, 辽宁 沈阳 110034
    3.辽宁电力能源发展集团有限公司, 辽宁 沈阳 110013
  • 收稿日期:2021-05-27 出版日期:2021-10-30 发布日期:2022-01-25
  • 作者简介:邹德维(1995—),男,硕士研究生,研究方向为断路器同步控制。|王连铁(1968—),男,副研究员,主要从事电气火灾鉴定和预防等工作。|孟 宇(1984—),男,高级工程师,主要从事能源电力发展及建设设计管理工作。
  • 基金资助:
    国家自然科学基金面上资助项目(51777129);国家重点研发计划(2019YFC0810703-1)

Short-circuit Current Frequency Measurement and Zero Prediction Method Based on Least Square Correlation Coefficient

ZOU Dewei1, WANG Liantie2, MENG Yu3, MA Shaohua1   

  1. 1. School of Electrical Engineering,Shenyang University of Technology,Shenyang 110870,China
    2. Emergency Management Department Shenyang Fire Research Institute,Shenyang 110034,China
    3. Liaoning Power Energy Development Group Co.,Ltd.,Shenyang 110013,China
  • Received:2021-05-27 Online:2021-10-30 Published:2022-01-25

摘要:

基于最小二乘法线性相关系数最大原则对电网实际频率进行测量,用电网实际频率构建最小二乘法系数矩阵,再对短路电流特征参数进行辨识,据此预测短路电流的过零点。仿真结果表明,所提方法可以有效地测量出电网的实际频率,且可消除非同步采样时频率偏移造成的短路电流特征参数及零点预测误差。

关键词: 零点预测, 线性相关系数, 最小二乘法, 频率偏移

Abstract:

The actual frequency of the power grid is measured based on the principle of maximum linear correlation coefficient of the least square method,and the power grid actual frequency is used to construct the least square method coefficient matrix,and then the characteristic parameters of the short-circuit current are identified,based on which the zero-crossing point of the short-circuit current is predicted.The simulation results show that the method can effectively measure the actual frequency of the power grid,and can eliminate the short-circuit current characteristic parameters and zero prediction errors caused by asynchronous sampling frequency offset.

Key words: zero prediction, linear correlation coefficient, least square method, frequency offset

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