摘要
用谐波分析法测量介质损耗因数时, 数据采样不同步所引起的频谱泄漏会造成测量误差。为抑制这种误差,本文提出了一种新算法——卷积窗加权算法。该算法的特点是:①实现简单且精度高,无须同步采样措施, 在正常的电网频率波动范围内, 只需用三阶卷积窗对三个额定周期的采样信号加权便可将频谱泄漏引起的测量误差减少到可以忽略的程度;②运算量少,每次测量所需乘法次数和加法次数仅约为采样点数的两倍,比 FFT 所需的计算量小得多,且点数不受限制。
When the harmonic analysis method is used to measurement of dielectric loss factor, the non-synchronization sampling can cause a remarkable error. In order to reduce the error, a novel algorithm based on convolution window weighted of sampling data is proposed. The algorithm has the following advantages: ?simple implement and high accuracy. For proper fluctuation of frequency, the error resulting from non-synchronization sampling can be reduced to a negligible level only by weighting sampling sequence with the third order convolution window, without any synchronous sampling technique; ?less computing burden: the numbers of both multiplications and sums required in each frame are only double the number of the samples.
出处
《电工技术学报》
EI
CSCD
北大核心
2005年第3期100-104,共5页
Transactions of China Electrotechnical Society
基金
国家自然科学基金资助项目(69931030)。
关键词
介质损耗因数
谐波分析法
卷积窗
误差分析
Dielectric loss factor, harmonic analysis method, convolution window, error analysis
