Rogowski线圈电流互感器中的高精度数字积分器技术研究  

Technical Research of Accurate Digital Integrators for Rogowski Coil Current Transformer

作　　者：宋涛[1,2] 

机构地区：[1]淄博职业学院电子电气工程学院,淄博255314 [2]华中科技大学电气与电子工程学院,武汉430074

出　　处：《高电压技术》2015年第1期237-244,共8页High Voltage Engineering

基　　金：山东省科技发展计划项目(2011GGA03213);山东省高等学校科技计划项目(J12LN93)~~

摘　　要：针对模拟器件易受温度、环境等因素影响，以及目前的数字积分算法准确度不高、且易受输入信号中直流分量的影响的问题，提出了基于直流负反馈原理的改进Al-Alaoui数字积分算法。该算法有效克服了常用模拟积分器存在的零漂、温漂等问题，几乎不受温度变化等因素的影响。此外，该算法采用比例一积分一微分（PID）反馈控制器和衰减系数来改进数字积分器的直流响应特性，能较好地抑制输入信号中直流分量的影响，改进的数字积分算法频率特性比传统算法更接近于理想积分器的频率特性。仿真和测试结果表明：改进的数字积分算法在额定电流的5％-120％范围内满足0．05％的准确度要求。Analog integrators can be easily influenced by temperature and some other environmental factors, meanwhile, accuracy of commonly used digital integration algorithms is not high enough, and is affected by the DC component of input signals. Hence, we have proposed an improved Al-Alaoui digital integration algorithm based on DC negative feedback, which is hardly affected by temperature changes, so it resolves the problems of zero drift and temperature drift for analog integrators. Moreover, since the algorithm adopts PID feedback controller and attenuation coefficient to improve the DC response of digital integrators, it can prevent the influence from DC component in input signals. Compared with conventional integrators, a digital integrator with the improved algorithm can obtain frequency responses closer to those of ideal integrator. Further simulation and tests show that improved digital integrator has high accuracy up to 0.05 class in the range of 5 %- 120% of rated current.

关 键 词：模拟积分 数字积分 直流负反馈 频率特性 ROGOWSKI线圈 温度性能 

分 类 号：TM452[电气工程—电器]