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。
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.
作者
邹德维
王连铁
孟宇
马少华
ZOU Dewei;WANG Liantie;MENG Yu;MA Shaohua(School of Electrical Engineering,Shenyang University of Technology,Shenyang 110870,China;Emergency Management Department Shenyang Fire Research Institute,Shenyang 110034,China;Liaoning Power Energy Development Group Co.,Ltd.,Shenyang 110013,China)
出处
《电器与能效管理技术》
2021年第10期13-17,共5页
Electrical & Energy Management Technology
基金
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)。
关键词
零点预测
线性相关系数
最小二乘法
频率偏移
zero prediction
linear correlation coefficient
least square method
frequency offset
