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采用双磁路的电流互感器在线取电方法
作者:
作者单位:

长沙理工大学电气与信息工程学院,湖南省长沙市 410114

作者简介:

王旭红(1969—),女,博士,教授,硕士生导师,主要研究方向:电气设备状态监测与故障诊断。E-mail:348877201@ qq.com
胡劼睿(1992—),男,硕士研究生,主要研究方向:电气设备状态监测与故障诊断。E-mail:461972427@qq.com
樊绍胜(1966—),男,通信作者,博士,教授,博士生导师,主要研究方向:电力特种机器人。E-mail:fss508@163.com

通讯作者:

基金项目:

电力机器人湖南省重点实验室项目(2018TP1025)。


On-line Power Acquiring Method of Current Transformer with Dual Magnetic Circuit
Author:
Affiliation:

School of Electrical and Information Engineering, Changsha University of Science & Technology, Changsha 410114, China

Fund Project:

This work is supported by Hunan Provincial Key Laboratory of Power Robots (No. 2018TP1025).

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    摘要:

    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,一个两半圆磁芯安装于输电线路上,通过二次侧接入电容使磁路中的励磁电感与电容发生并联谐振,增大该磁路阻抗值,从而控制线路上的电流更多流入双磁路另一磁路线圈,并通过该磁路实现内部阻抗与外部负载值匹配,获取最大功率。基于该取电方法,提出调整谐振电容的磁芯防饱和方法,使取电装置维持高取电功率的同时正常工作。采用Maxwell与Simplorer的联合仿真验证了该取电方法的正确性和线路谐波情况下的适用性。初步搭建的取电装置实验表明,双磁路取电功率满足高压输电线路监测设备需求。

    Abstract:

    Aiming at the problems such as easy saturation of magnetic circuit and low acquired power of the widely used on-line power acquiring device of current transformer, this paper proposes an on-line power acquiring method combining dual magnetic circuit topology with resonant power control. In the dual magnetic circuit structure, a two-semicircle magnetic core is installed on the transmission line, and the excitation inductance in the magnetic circuit is resonant in parallel with the capacitance through the secondary-side connection capacitor, which increases the impedance value of the magnetic circuit. Thus, the current on the line is controlled to flow more into the other magnetic circuit coil of the dual magnetic circuit, through which the internal impedance is matched with the value of the external load, and the maximum power is obtained. Based on this method, an anti-saturation strategy of magnetic core controlled by excitation inductor and resonant capacitor is put forward, which makes the device keep high acquired power while work normally. The correctness of the method and the applicability for the circuit harmonic are verified by the joint simulation of Maxwell and Simplorer. The preliminary test shows that the power acquired by the dual magnetic circuit can meet the requirement of monitoring equipment of high voltage transmission line.

    表 1 Table 1
    图1 双磁路在线取电方法Fig.1 On-line power acquiring method with dual magnetic circuit
    图2 取电电路拓扑Fig.2 Topology of power acquiring circuit
    图3 双磁路并联谐振电容取电装置等效电路Fig.3 Equivalent circuit of power acquiring device of parallel resonant capacitor based on dual magnetic circuit
    图4 3种情况下的负载阻抗值与获得功率曲线Fig.4 Curves of acquired power varied with load resistance in three cases
    图5 2种情况下的负载功率曲线图Fig.5 Load power curve in two cases
    图 等效电路简化图Fig. Equivalent circuit reduction diagram
    图 TA1磁芯空载电压电流波形图Fig. TA1 core no-load voltage and current waveform
    图 TA1并联电容电压电流波形图Fig. TA1 shunt capacitor voltage and current waveform diagram
    图 磁芯励磁电流与线路电流关系图Fig. Diagram of the relationship excitation current of the Magnetic Core and the current of the Line
    图 电流基波以及谐波波形Fig. Current fundamental and harmonic waveforms
    图 TA1磁芯Maxwell模型图Fig. TA1 core Maxwell model diagram
    图 联合仿真平台Fig. Co-simulation platform
    图 常规电流互感器式取电装置功率Fig. Power of conventional current transformers power acquiring device
    图 双磁路取电装置功率Fig. Power of Double magnetic circuit power acquiring device
    图 取电电源实验平台Fig. Power supply experiment platform
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引用本文

王旭红,胡劼睿,樊绍胜,等.采用双磁路的电流互感器在线取电方法[J].电力系统自动化,2020,44(4):187-194. DOI:10.7500/AEPS20190126006.
WANG Xuhong,HU Jierui,FAN Shaosheng,et al.On-line Power Acquiring Method of Current Transformer with Dual Magnetic Circuit[J].Automation of Electric Power Systems,2020,44(4):187-194. DOI:10.7500/AEPS20190126006.

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  • 收稿日期:2019-01-26
  • 最后修改日期:2019-07-12
  • 录用日期:2019-07-12
  • 在线发布日期: 2020-02-25
  • 出版日期: