电力系统自动化2017，Vol.41Issue(9)：174-181,8.DOI:10.7500/AEPS20160802001
应用于频率宽范围波动电网的自适应采样相位差校正法
Phase Difference Correction Method Based on Adaptive Sampling Applied in Power Systems with Wide Frequency Fluctuation Range
林申力 1陈隆道1
作者信息
- 1. 浙江大学电气工程学院, 浙江省杭州市 310027
- 折叠
摘要
Abstract
The spectral leakage from asynchronous sampling is the main source of the measurement error for the phase difference correction method in the power harmonic analysis undergoing constant sampling.When making continuous measurement of the power signals in the wide frequency fluctuation range, the measurement of phase difference correction method may fail.An improved method based on adaptive sampling is presented.The real-time fundamental frequency is predicted according to the fundamental frequency of the previous measurement and the rate of change of frequency calculated in the previous measurement.The sampling rate is adjusted according to the predicted fundamental frequency in time to make the sampling rate match the real-time fundamental frequency.The variable-frequency power signals are simulated under the conditions of adaptive sampling and constant sampling, respectively.The results show that the accuracy of amplitudes is improved by one order of magnitude, that of phases 3 to 14 times and the time length of the window is 40% of that prescribed by IEC standard.This method reduces the spectral leakage from dynamic fundamental frequency offset and makes the phase difference correction method accurate and quick in the continuous harmonic measurement of the power systems in the wide frequency fluctuation range.关键词
谐波测量/频率波动/频率变化率/自适应采样/相位差校正法Key words
harmonic measurement/frequency fluctuation/rate of frequency change/adaptive sampling/phase difference correction method引用本文复制引用
林申力,陈隆道..应用于频率宽范围波动电网的自适应采样相位差校正法[J].电力系统自动化,2017,41(9):174-181,8.
