Rogowski线圈在高压变频器共模电流测量中的应用

Applications of Rogowski Coil in Common-mode Current Measurement of High Voltage Inverter

针对霍尔电流传感器与传统电流互感器检测共模电流存在缺陷情况,提出一种新型的基于Rogowski线圈测量共模电流的方法。以五相H桥型三电平逆变系统共模通路为例,仿真得到共模电流属于高频脉冲电流。建立Rogowski线圈传感头等效回路模型,理论上验证了测量方法的可行性。对电机端单线圈、滤波器端双线圈、滤波器端单线圈三种共模电流测量方案进行比较分析,仿真和实验结果证明了滤波器端单线圈方案的可行性和正确性。

In view of defect condition for Holl current transducer and traditional current transformer in measuring common-mode current,a novel method of measuring common-mode current based on Rogowski coil is proposed in this paper.Take the common-mode circuit of five-phase H-bridge three-level inverter as an example,simulation indicates common-mode current belongs to a typical pulse current with high frequency.The model of its equivalent circuit is built and the feasibility of measurement method is validated in theory.The three schemes of measuring common-mode current for motor with single coil,filter with two coils and filter with single coil are compared and analyzed.Simulation and experimental results verify the validity and feasibility of the third scheme.