改进保留非线性算法在介损测量应用中的研究  

Research of the Improved Method of Nonlinear Reserved Arithmetic Applied in the Measurement of Dielectric Loss

作　　者：袁旭龙[1] 冯小华[2] 

机构地区：[1]邵阳学院,邵阳422000 [2]武汉大学电气工程学院,武汉430072

出　　处：《高电压技术》2005年第3期39-40,共2页High Voltage Engineering

摘　　要：摘针对高阶正弦拟合法中迭代所用的运算时间和计算精度之间的矛盾制约该法用于介损测量的问题。提出一种快速收敛潮流算法—改进保留非线性算法,使介损的数字化测量中,在 tanδ<0. 000 3 时,计算时间<10ms。在满足介损在线监测的同时,还可以实时检测系统频率,为同步采样提供了一条新途径。In the digital measurement of dielectric loss, the measurement accuracy will be influenced by leakage error because of the fluctuation of the system frequency. The higher-order sine fitting algorithm takes the power frequency as an unknown parameter and use a nonlinear least squares fitting procedure based on a higher-order model to process the sampling data. So the method solves the problem of the asynchronous sampling, but the main obstacle of applications with this method is the contradiction between accuracy and rate when solving the nonlinear equations. This paper firstly applies the improved method of nonlinear term reserved arithmetic to the digital measurement of dielectric loss angle and successfully solves the antinomy. Experiments show that the maximum measurement error is limited to 0.0003, but it takes less than 10 ms for one calculation. At the same time, it can measure the power frequency in real time so it can give a new way to sample synchronously.

关 键 词：介损损耗 高阶正弦拟合法 改进保留非线性法 修正理想采样频率 

分 类 号：TM934[电气工程—电力电子与电力传动]