基于滞后相位校正的高精度直流大电流比较仪  

High-precision large direct current comparator based on phase lag correction

作　　者：任士焱[1] 丁欣颖[1] 邵滨海[1] 李林[1] 

机构地区：[1]强电磁工程与新技术国家重点实验室华中科技大学电气与电子工程学院,武汉430074

出　　处：《电子测量与仪器学报》2013年第5期415-420,共6页Journal of Electronic Measurement and Instrumentation

基　　金：国家自然科学基金(51177061)资助项目

摘　　要：直流大电流比较仪通常采用传统的超前相位校正方法,很难提高系统的开环增益,限制了比较仪系统精度的提高。根据6kA直流大电流比较仪的工作原理及实际硬件电路,对仪器进行了系统建模分析,求出了系统的精度为1.141 55×10-6,通过超前相位校正保证了系统的稳定。在此前提下,提出了引入滞后相位校正的思路,设计了近似比例积分调节器,仿真结果表明,在原有系统稳定性得到兼顾的情况下,同时使得系统的精度得到了较大的提高,达到了1.141 6×10-7。Usually, large direct current comparator adopts the traditional method of phase lead correction, which is difficult to improve the system＇s open-loop gain and the precision of comparator. According to the working principle and practical circuit of the 6 kA large direct current comparator, the model building and system analysis of this ap- paratus are carried out, the theoretical accuracy calculated reaches 1. 141 55 ×10^-6, and the stability of the system is ensured through phase lead correction. On this basis, the phase lag correction is introduced and the approximate proportional integral regulator is designed. The simulation results show that it could not only guarantee the original stability of the system, but also make the comparator obtain a greater theoretical precision of 1. 141 6 ×10^-7.

关 键 词：直流大电流比较仪 滞后相位校正 近似比例积分调节器 

分 类 号：TM93[电气工程—电力电子与电力传动]