一种适用于Rogowski线圈电流互感器的新型数字积分算法设计

A New Kind of Digital Integration Algorithm for Current Transformer of Rogowski Coil

积分器是Rogowski线圈电流互感器的关键环节,但模拟积分器受各因素影响难以达到高准确度,而数字积分算法存在很大的累加误差。为此,设计了一种新型数字积分算法,取代传统的模拟积分器应用于Rogowski线圈电流互感器,以提高其电流测量准确度。该积分算法运用负反馈控制来减小Al-Alaoui数字积分算法信号处理环节中的直流分量,改善其低频响应,有效解决信号直流漂移和积分初值影响,适用于Rogowski线圈积分环节。仿真和试验表明:相比于模拟积分器,运用新型数字积分算法的Rogowski线圈电流互感器在稳态特性、暂态特性、温度变化影响方面都有明显改善。

Integrator is the key link of current transformer （CT） of Rogowski coil, but it is hard to reach high veracity of an- alog integrator due to affects of various factors while there are great cumulative errors in digital integration algorithm. Therefore, a kind of new digital integration algorithm was designed to replace traditional analog integrator to be applied in CT of Rogowski coil so as to improve current measuring veracity. Negative feedback control was used to reduce direct cur- rent （DC） components in processing A1-Alaoui digital integration algorithm signals, improve low frequency response and ef- fectively solve problems of DC drift of signals and affect of initial value of integration which was suitable for integration of Rogowski coil. Simulation and experiment indicates that compared with analog integrator, steady-state characteristic, transi- ent characteristic and influence of temperature changes of DC of Rogowski coil are obviously improved by using this new dig- ital integration algorithm.