基于数字积分算法的电子式电流互感器传变特性

摘要

Electronic current transducer is one of the key equipments for electric energy metering,measurement and relay protection in the power system.In order to comprehensively analyze the effects of different integration algorithms on its transfer characteristics,taking the Rogowski coil as example,the transfer characteristics were compared with frequently-used rectangular,trapezoidal,Simpson and bilinear transform integration algorithms.Firstly,the overall transfer function of the electronic current transducer was obtained based on the Rogowski coil equivalent circuit and the integral algorithm.Secondly,the amplitude and phase frequency characteristics of the electronic current transducer were compared with different integration algorithms.Finally,taking an electronic current transducer at a 110 kV substation as an example,the transducer transfer characteristics with different integration algorithms were simulated in the case of the steady-state and dynamic input signals.The results show that with the different integration algorithms,the electronic current transducer has good frequency characteristics and the steady-state transfer characteristics,however,it exhibits more obvious differences in terms of the capability of dynamic performances tracking and anti-interference and the anti-disturbances.%电子式电流互感器是电力系统中用于电能计量、测量和继电保护的重要设备之一,文章以Rogowski线圈电子式电流互感器为例,对常用的矩形、梯形、Simpson和双线性变换积分算法进行比较分析,全面评估不同积分算法可能对其传变特性的影响.首先,基于电子式电流互感器等效电路和积分算法分别获取其传递函数;其次,通过各个环节幅频和相频特性分析,获取并比较了含不同积分算法的电子式互感器整体的频带特性;最后,以某实际110 kV变电站用电子式电流互感器参数为例,针对稳态和动态信号不同输入情况下,对含不同积分算法的电子式互感器传变特性进行仿真.结果表明:不同积分算法的互感器均有良好的频带特性和稳态传变特性,但在动态特性跟踪以及抗干扰能力方面则具有较为明显差别.