介损在线监测的3种改进谐波分析法的分析  

Analysis of Three Modified Algorithms for On-line Measurement of tanδ

作　　者：冯小华[1] 吴正茂[1] 张承学[1] 

机构地区：[1]武汉大学电气工程学院,湖北武汉430072

出　　处：《高压电器》2005年第1期4-5,9,共3页High Voltage Apparatus

摘　　要：谐波分析法用于介损在线测量时,由于系统频率波动,难以满足理想的同步采样,从而产生泄漏误差影响基波相角测量的准确度。为减小泄漏误差,提高介损测量准确度,通过加窗插值,修正理想采样频率和采取偏移频率补偿对原算法进行了改进。理论推导和仿真结果都验证了改进方法的有效性。When applying harmonics analysis approach to measuring tanδ on-line, the measurement accuracy will be influenced by leakage error because of the frequency fluctuation of power system. To improve the accuracy, this paper introduces three modified algorithms of interpolation algorithm on Blackman-Harris window, algorithm of modified frequency and algorithm of frequency compensation. Theory derivation and simulation results verify that the modified algorithms have higher accuracy than the original ones.

关 键 词：介质损耗 谐波分析法 在线监测 修正理想采样频率 偏移频率补偿 

分 类 号：TM76[电气工程—电力系统及自动化]