基于并联谐振的双磁路在线取电方法研究

Research on online power acquiring method of dual magnetic circuit based on parallel resonance

在线取电装置对高压输电线路监测设备稳定供能有重要作用。针对目前应用较为广泛的电流互感器在线取电装置存在磁路易饱和、取电功率较小等问题,提出双磁路拓扑结构与谐振功率控制相结合的在线取电方法。在双磁路结构中,通过其中一磁路并联电容,使磁路励磁电感与电容发生谐振或脱离谐振,控制该磁路阻抗值从而控制流入另一取电磁路的电流和取电功率。利用Maxwell软件对取电磁心进行有限元分析,由Simplorer软件搭建取电装置模型,与Maxwell进行联合仿真,通过对磁场与电路耦合分析,验证了该取电方法的正确性。初步搭建的取电装置实验表明,取电功率满足高压输电线路监测设备需求,为取电装置的进一步试制奠定了基础。

On-line power acquiring device plays an important role in the stable energy supply of high-voltage trans-mission line monitoring equipment.To solve problems such as easy saturation of magnetic circuit and too small ac-quired power which existed in conventional current transformer online power-taking device,an online power acqui-ring method based on dual magnetic circuit topology and resonant power control is proposed.In the dual magnetic circuit structure,one magnetic circuit is paralleled with a capacitor to make the magnetic circuit excitation induct-ance resonant or detached resonance.Adjusting its impedance value,the current and power of another magnetic circuit is controlled.Maxwell software is used to perform finite element analysis on the electromagnetic core,while the Simplorer software is applied to build the power acquiring device model.Through the co-simulation with Max-well and Simplorer software,the correctness of the power acquiring method is verified by analysis of the magnetic field and circuit coupling.The preliminary experimental results show that the acquiring power meets the require-ments of the high-voltage transmission on-line monitoring equipment,which laid the foundation for the further trial production of the power acquiring device.