电力系统保护与控制2016，Vol.44Issue(12)：23-28,6.DOI:10.7667/PSPC151000
基于高精度测频的修正DFT相量及功率测量算法
Amodified DFTofphasor and power measurement algorithm based on high precision frequency measurement
摘要
Abstract
In order to improve the power system phase and power measurement accuracywhen frequency offset, this paper presents amodified DFT ofphasorand poweralgorithm based on improved expansionKalman filter (IEKF) frequencymeasurement, the measurement error of DFT under nonsynchronous sampling caused by frequency offset is analyzed, andthe function relationshipbetween the phase, amplitude and frequency offset and initial phase angle is established. The frequency offset is obtained by IEKF, and then the DFT calculation results can be corrected to obtain the real phase and power of the signal. The simulation resultsshow that theproposed method compared with the traditional adaptive DFT algorithmcan effectively eliminate or weaken the influence of harmonics,noise and frequency offseton the synchronized phasor measurement,andimprove the precision of phasor and power measurement.关键词
离散傅里叶变换(DFT)/IEKF/非同步采样/相量测量/功率测量Key words
discreteFourier transformation(DFT)/improved extended Kalman filter/non-synchronous sampling/phasor measurement/power measurement引用本文复制引用
谢运华,赵庆生,郭贺宏,张学军..基于高精度测频的修正DFT相量及功率测量算法[J].电力系统保护与控制,2016,44(12):23-28,6.基金项目
国家自然科学青年基金项目(51505317)；山西省自然科学基金项目(2015011057)This work is supported by National Natural Science Foundation of China (No.51505317) and Natural Science Foundation of Shanxi Province (No.2015011057) （51505317）
