电测与仪表2016，Vol.53Issue(24)：6-10,93,6.
高频信号注入法测量配电网电容电流及滤波的研究
Research on signal injection method with high frequency for distribution network capacitive current measurement and filtering
摘要
Abstract
In order to solve the problems such as frequency selection and power frequency interference of the signal in -jection method to measure the capacitance current of the distribution network , this paper analyzes and improves the method of high frequency signal injection .Firstly, the inductance value is obtained by injecting 5 000 Hz high fre-quency signals , and then the resonance frequency of the power grid is determined through the frequency sweep method and the distribution of capacitance current value is calculated according to the formula , and by using the method of se-ries capacitor to reduce the capacitance of big earth capacitance system , so as to realize accurate measuring capaci-tance current.At the same time, the filtering function is achieved by using the digital signal processor TMS 320F28335 and the finite impulse response ( FIR) filter algorithm to filter the power frequency interference signals when frequency sweeping .Through theoretical analysis and experimental verification , this method can increase the range of capaci-tance to ground measurement , simplify the calculation , filter the power frequency signal , and the relative error of the measurement is less than 5%.关键词
对地电容/高频/电容电流/谐振/有限冲击响应滤波器Key words
capacitance to ground/high frequency/capacitive current/resonance/finite impulse response filter分类
信息技术与安全科学引用本文复制引用
景旭,孙岩洲,宋晓燕..高频信号注入法测量配电网电容电流及滤波的研究[J].电测与仪表,2016,53(24):6-10,93,6.基金项目
国家自然科学基金资助项目（ U1204506）；第46批教育部留学回国人员科研基金 （）
