摘要
针对电流互感器一次工作电流大范围变化 ,导致电能计量系统准确度下降的问题 ,提出基于有源补偿原理的双级电流互感器方案 ,使上述问题得以圆满解决。该互感器包括电流互感器激磁电流相似提取、幅值自适应跟踪和误差测量等 3个模块 ,通过电路与磁路构成闭环测量系统 ,采用跟踪电流互感器测量误差的方法 ,利用自适应控制器实时调整补偿量的幅值增益系数 ,达到拓宽量程的目标。在实际测试过程中 ,当一次电流从额定值的 5 %变化到 1 2 0 %时 ,该电流互感器的测量误差不超过一次电流额定值在 1 0 0 %时准确度为 0 .
It has been a challenging problem that the accuracy of a current transformer is often compromised greatly when its primary side current changes within a large range. This problem is solved completely by a new type of active compensated current transformer as proposed in the paper. The proposed current transformer is composed of a resemble excitation current extracted unit, a gain self-adaptive controller and an error measurement unit. The current transformer behaves as a magnetic feedback measurement system and the large range measurement is achieved by the gain self-adaptive controller, the input of which is the error measurement. In test, when the primary side current changes from 5% to 120% of the rating value, errors of the large range current transformer are less than the required standard of 0.1 grade at rating.
出处
《电力系统自动化》
EI
CSCD
北大核心
2003年第10期63-66,共4页
Automation of Electric Power Systems
关键词
电流互感器
有源补偿
自适应控制
测量误差
量程
Adaptive control systems
Electric current measurement
Equivalent circuits
Error analysis
