传统的电流互感器（current transformer, CT）为在线监测设备供电时，由于输电线路电流的大范围波动，将会导致小电流时CT取能不足、大电流时CT磁心饱和的问题。针对输电线路电流宽范围取能不稳定问题，提出了基于多绕组补偿的感应取能控制方法。首先对取能CT等效模型进行分析，推导出二次侧感应电压和磁感应强度数学表达式；同时对铁芯电磁特性进行分析，获得在不同电流大小下对应的取能CT输出特性。其次，采用电压源型整流电路（voltage source rectifier, VSR）拓扑结构对取能CT进行励磁补偿。通过分析不同二次侧负载对VSR输出特性的影响，控制其四象限运行模式，即在过磁情况下单相VSR输出特性表现为容性，在欠磁情况下单相VSR输出特性表现为感性。再次，通过对二次侧等效阻抗及励磁电流进行等效建模及计算，获得不同运行模态下的区间阈值，在不同区间范围内控制单相VSR工作在不同模式，实现CT二次侧阻抗从容性到感性的动态调节，保证取电CT在一次电流大范围变化时，维持稳定的输出电压。最后，搭建仿真模型及实验平台，通过仿真及实验结果对所提控制感应取能装置的多绕组解决方案的可行性及有效性进行验证。

Current transformer (CT) is always used to be the power supply for on-line monitoring equipments. However, the wide range fluctuation of transmission line current will lead to the problems of insufficient CT energy extraction for small current and CT core saturation for large current. An induction energy extraction device based on multi-winding compensation was proposed to address the problem of unstable energy extraction over a wide range of transmission line current. Firstly, the mathematical expressions for secondary side induced voltage and magnetic induction intensity were derived based on the analysis of energy extraction CT equivalent model. At the same time, the electromagnetic characteristics of the iron core were analyzed to obtain the corresponding output characteristics under different current sizes. Secondly, a voltage source rectifier(VSR) circuit topology was used for excitation compensation of the energy extraction CT. The four quadrant operation mode was controlled by analyzing the impact of different secondary side loads on the output characteristics of VSR. The VSR output characteristics show capacitive under over-magnetism condition and inductive under under-magnetism condition. Thirdly, the interval thresholds under different operating modes were obtained by modeling and calculating the equivalent impedance and excitation current on the secondary side. And the VSR was controlled to operate in different modes within different intervals to achieve dynamic adjustment of CT secondary impedance from capacitive to inductive, which ensures that the power CT maintains stable output voltage when the primary current changes over a large range. Finally, the simulation model and experimental platform were constructed. The feasibility and effectiveness of the proposed multi-winding solution for controlling the inductive energy extraction device were verified by simulation and experimental results.