基于分数延时方法的高精度数字积分器研究  

Research of High Accuracy Digital Integrator Based on Fracyional Delay Method

作　　者：李振华[1,2] 张思球 孙婉桢 李振兴[2] 

机构地区：[1]三峡大学湖北省微电网工程技术研究中心,湖北宜昌443002 [2]三峡大学电气与新能源学院,湖北宜昌443002

出　　处：《高压电器》2018年第2期202-207,共6页High Voltage Apparatus

基　　金：国家自然科学基金项目(51507091);湖北省自然科学基金项目(2015CFB219)~~

摘　　要：积分器是基于Rogowski线圈的电子式电流互感器的关键环节之一。针对传统的模拟积分器易受环境温度变化、电磁干扰、湿度变化等因素的影响以及当前的数字积分算法准确度不高的问题,在传统的数字积分器的基础上提出了一种改进的数字积分器。该积分器采样率为传统的8倍,且在此基础上加入了一个值为0.047的分数延迟因子。这一改进的数字积分器可以有效改善传统的数字积分器在低频段的幅值响应和相位响应。文中采用FIR和IIR两种滤波法对其进行了仿真分析,结果表明,相较传统的数字积分器,改进的数字积分器性能更加优异。Integrator is a key element in an electronic current transformer based on Rogowski coil. Traditional analogintegrator is easily affected by the environment temperature change,electromagnetic interference and humiditychange and so on,the current integral algorithm accuracy is not high. Therefore,an improved integrator based on thetraditional integrator is designed. Sampling rate of the improved integrator is eight times higher than traditional inte-grator and a delay factor of 0.047 is also joined. The improved integrator can effectively improve the amplitude re-sponse error and phase angle response of the traditional Al-Alaoui integrator in the low frequency stage. FIR and IIRfiltering method can be used to simulate and analyze in this paper,the results indicate that the performances of theimproved integrator are better than the traditional integrator.

关 键 词：Al-Alaoui数字积分器 积分算法 FIR/IIR 分数延时 

分 类 号：TM452[电气工程—电器]