井下磁耦合无线电能传输系统的全谐振特性分析

张莲; 杨洪杰; 经廷伟; 李涛; 张路

doi:10.13272/j.issn.1671-251x.2021110064

井下磁耦合无线电能传输系统的全谐振特性分析

doi: 10.13272/j.issn.1671-251x.2021110064

重庆理工大学电气与电子工程学院, 重庆 400054

基金项目:

重庆市教委科学技术研究项目（KJQN201801142，KJQN202001144）；重庆市技术创新与应用发展专项面上项目（cstc2019jscx-msxmX0003）。

详细信息

作者简介:
张莲(1967-),女,重庆人,教授,硕士,主要研究方向为电气控制技术、电气设备状态监测等,E-mail:zh_lian@cqut.edu.cn。

通讯作者:
张路(1986-),男,重庆人,讲师,博士,主要研究方向为无线电能传输技术等,E-mail:road@cqut.edu.cn。

中图分类号: TD60
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出版历程
- 收稿日期: 2021-11-25
- 修回日期: 2022-01-23
- 网络出版日期: 2022-03-01

Analysis of full resonance characteristics of underground magnetic coupling wireless power transfer system

School of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing 400054, China

摘要

摘要: 在井下应用磁耦合无线电能传输（MC-WPT）系统供电时，如果系统参数配置不当会引起系统输入阻抗呈非纯阻性，从而造成系统失谐，影响井下电力设备的供电效率。MC-WPT系统二次侧采用串联补偿（S）时易于实现谐振，但在二次侧采用并联补偿（P）时，现有研究都是在系统仅一次侧谐振、二次侧未谐振导致系统未全谐振的基础上进行的。针对上述问题，提出了一种MC-WPT系统的全谐振补偿方式。以SP型、PP型、LCC-P型和LCL-P型补偿拓扑作为二次侧并联MC-WPT系统研究对象，利用阻抗分析法得到系统处于全谐振状态的参数约束关系，并采用Matlab/Simulink对传统补偿方式和全谐振补偿方式进行仿真对比，结果表明：全谐振补偿方式下的SP型、PP型、LCL-P型补偿拓扑输出功率大于传统补偿方式下的输出功率，LCC-P型补偿拓扑输出功率小于传统补偿方式下的输出功率；在全谐振补偿方式下，SP型与PP型拓扑效率与传统补偿方式下的效率相差不大，LCC-P型拓扑效率远高于传统补偿方式下的效率，LCL-P型拓扑效率略低于传统补偿方式下的效率；全谐振模式下系统无需提供无功功率，视在功率等于给定的输出功率；全谐振补偿方式下SP型拓扑更适合应用于煤矿井下，不受互感变化影响，但受电阻负载影响较大。针对全谐振补偿方式下SP型MC-WPT系统谐振频率受电阻负载影响及电阻负载具有下限值的问题，利用DC-DC变换器，将阻抗匹配与有源功率因数校正相结合，实现系统整流桥输入侧等效阻抗始终等于预设谐振频率对应电阻值，同时保证系统整流桥输入电流与电压同相位，降低DC-DC变换器的引入对系统阻抗的影响。以SP型MC-WPT系统为实验对象进行验证，结果表明：SP型MC-WPT系统在全谐振补偿优化方式下能脱离电阻负载的束缚，系统不受互感影响及负载变化影响，稳定在全谐振模式下，提高了输出功率与输出效率。
- 井下磁耦合无线电能传输 /
- 全谐振 /
- 阻抗匹配 /
- 二次侧并联补偿 /
- 全谐振补偿方式 /
- 四开关Buck-Boost变换器 /
- SP型MC-WPT系统
Abstract: When the magnetic coupling wireless power transfer (MC-WPT) system is used for power supply underground, if the system parameters are not properly configured, the input impedance of the system will show non pure resistance, which will cause the system detuning and affect the power supply efficiency of underground power equipment. When the series compensation (S) is used in the secondary side of MC WPT system, it is easy to realize resonance. However, when the parallel compensation (P) is used in the secondary side, the existing research is based on the fact that the system only resonates at the primary side and the system does not fully resonate due to the non-resonance at the secondary side. In order to solve the above problems, a full resonance compensation method for magnetic coupling wireless power transfer (MC-WPT) system is proposed. In this paper, SP-type, PP-type, LCC-P type and LCL-P type compensation topologies are taken as the research object of the secondary side parallel MC-WPT system. The parameter constraint relation of the system in full resonance state is obtained by using impedance analysis method. The simulation comparison between the traditional compensation method and the full resonance compensation method is carry out by using Matlab/Simulink. The results show that the output power of SP type, PP type and LCL-P type compensation topology under the full resonance compensation method is greater than that under the traditional compensation method, and the output power of the LCC-P type compensation topology is less than that under the traditional compensation method. In the full resonance compensation method, the efficiency of SP-type and PP-type topology is not much different from that under the traditional compensation method, the LCC-P-type topology efficiency is much higher than that under the traditional compensation method, and the LCL-P-type topology efficiency is slightly lower than that under the traditional compensation method. In the full resonance method, the system does not need to provide reactive power, and the apparent power is equal to the given output power. In the full resonance compensation method, the SP topology is more suitable for underground coal mines, which is not affected by the change of mutual inductance, but is greatly affected by the resistance load. In order to solve the problem that the resonant frequency of SP Type MC WPT system is affected by the resistance load and the resistance load has a lower limit value under the full resonance compensation method, a DC-DC converter is used to combine impedance matching with active power factor correction. Therefore, the equivalent impedance of the input side of the rectifier bridge of the system is always equal to the corresponding resistance value of the preset resonant frequency. At the same time, it also ensures that the system rectifier bridge input current is in phase with the voltage, reducing the impact of the DC-DC converter introduction on the system impedance. The SP MC WPT system is taken as the experimental object for verification. The results show that the SP-type MC-WPT system can be free from the constraints of the resistance load in the full resonance compensation optimization method, the system is not affected by the mutual inductance and load changes, and is stable in the full resonance method, which improves the output power and output efficiency.
- underground magnetic coupling wireless power transfer /
- full resonance /
- impedance matching /
- secondary side parallel compensation /
- full resonance compensation method /
- four-switch Buck-Boost converter /
- SP type MC-WPT system

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