东南大学学报（自然科学版）2011，Vol.41Issue(4)：744-749,6.DOI:10.3969/j.issn.1001-0505.2011.04.017
频率偏移情况下的同步相量修正
Synchronous phasor correction under frequency offset
摘要
Abstract
Since frequency offset may cause amplitude and phase angle error in discrete Fourier transform, a method of synchronization phasor correction is put forward, which solves the problem of 0/0 data for deviation in frequency. By uniform approximation using linear and quadratic function the correction equation is simplified and practical amplitude modification expression is derivated. Frequency offset turns round properties to oval properties in amplitude and phase space, and elliptic polar equation is rationally simplified, which avoids the angle mutations caused by discontinuity of tangent function. The mathematical error of this correction was analyzed, and the results show that after correction the errors of amplitude and phase are less than 0. 3% , which can meet the engineering requirement. Besides, simulation of signal with noise shows that the correction effect is getting worse when the signal to noise ratio increases. Therefore reasonable design of low pass filter is indispensable.关键词
PMU/频率偏移/0/0型/一致逼近Key words
phasor measurement units/frequency offset/0/0 model/uniform approximation分类
信息技术与安全科学引用本文复制引用
李梅,丁涛,顾伟,万秋兰..频率偏移情况下的同步相量修正[J].东南大学学报（自然科学版）,2011,41(4):744-749,6.基金项目
国家自然科学基金资助项目(50907008,60974036). （50907008,60974036）
