无线电能传输功率效率同步跟踪与控制方法研究

发布时间：2018-10-16 10:58

【摘要】：磁耦合谐振式无线电能传输技术作为一种新兴的电能传输技术不仅应用前景较大,传输距离较远而且还可以穿透障碍物。它弥补了传统无线电能传输中的不足,提出了无线电能传输的新方法,具有重要的科学意义和研究价值。目前,磁耦合谐振式无线电能传输技术离大规模推广还有一定的距离,该技术目前还存在一系列需要解决的问题,功率和效率问题就是其中之一。由于无线传输距离的改变、谐振线圈之间发生偏移以及负载发生改变等各方面因素都会影响整个传输系统的性能,尤其是导致系统的传输功率和效率大幅下降。本文针对上述问题研究了过耦合情况下功率和效率下降的问题以及频率分裂不一致性,提出一种传输功率和效率同步的方法——自适应频率同步跟踪控制方法。首先,本文对磁耦合谐振式无线电能传输系统的组成以及原理进行分析,并对系统频率特性进行了研究。研究发现当系统处于过耦合状态时,系统频率会发生分裂,从而导致传输功率和效率大幅下降。在此基础上,本文进一步深入研究了过耦合状态下功率最大值、效率最大值与频率的关系,得出了在过耦合状态下,系统传输功率最大值和效率最大值所对应的频率点不一致的结论。为系统功率效率同步跟踪提供了理论依据。其次,在磁耦合谐振式无线电能传输原理的基础上,设计了磁耦合谐振式无线电能传输频率跟踪实验系统,主要包括DSP控制系统、DDS信号发生器、功率放大器、谐振器、整流电路、无线通信模块和功率检测电路。基于频率跟踪的宗旨及硬件设计,本文对系统分裂状态进行拟合和数据分析之后,研究了三种优化算法及其改进方法,以提高频率跟踪的速度和精度,并通过matlab仿真验证其算法的可行性。最后通过结合无线通信装置,利用植入DSP的改进算法控制射频源频率同步跟踪系统谐振频率,从而提高过耦合工作状态下负载端接收功率和效率。最后,通过搭建的频率跟踪控制系统实验平台来验证理论的正确性。首先对系统功率和效率的不一致性进行了实验验证。其次,针对在是否加入频率跟踪的两种情况下,对功率最优、效率最优以及功率效率同步跟踪进行了实验研究。通过实验研究对提出的磁耦合谐振式无线电能传输系统频率跟踪控制方法的实时性、可靠性进行了验证,从而进一步丰富了无线电能传输技术的理论研究,促进了实用产品的开发。
[Abstract]:As a new kind of electric energy transmission technology, the magnetically coupled resonant radio energy transmission technology not only has a great application prospect, but also can penetrate obstacles. It makes up for the deficiency of traditional radio energy transmission, and puts forward a new method of radio energy transmission, which has important scientific significance and research value. At present, the technology of magnetically coupled resonant radio energy transmission is still far away from large-scale popularization. There are still a series of problems to be solved in this technology, among which power and efficiency are one of them. Because of the change of the wireless transmission distance, the deviation between the resonant coils and the change of the load will affect the performance of the whole transmission system, especially the transmission power and efficiency of the system will be greatly reduced. In this paper, the problem of power and efficiency decline and frequency splitting inconsistency under over-coupling is studied. An adaptive frequency synchronization tracking control method is proposed to synchronize transmission power and efficiency. Firstly, the composition and principle of the magnetic coupling resonant radio energy transmission system are analyzed, and the frequency characteristics of the system are studied. It is found that when the system is in an over-coupled state, the frequency of the system will split, resulting in a significant decrease in transmission power and efficiency. On this basis, the relationship between the maximum power, the maximum efficiency and the frequency in the over-coupling state is further studied in this paper, and it is concluded that in the over-coupling state, the relationship between the maximum power, the maximum efficiency and the frequency is obtained. The conclusion that the maximum transmission power and the maximum efficiency of the system are corresponding to the frequency point is inconsistent. It provides a theoretical basis for synchronous tracking of power efficiency. Secondly, on the basis of the principle of magnetic coupling resonance radio energy transmission, a frequency tracking experiment system of magnetic coupling resonant radio energy transmission is designed, which mainly includes DSP control system, DDS signal generator, power amplifier, resonator. Rectifier circuit, wireless communication module and power detection circuit. Based on the aim and hardware design of frequency tracking, after fitting and data analysis of the split state of the system, three optimization algorithms and their improved methods are studied to improve the speed and accuracy of frequency tracking. The feasibility of the algorithm is verified by matlab simulation. Finally, the resonant frequency of radio frequency synchronous tracking system is controlled by the improved algorithm of implanting DSP, which can improve the receiving power and efficiency of the load end under over-coupling operation. Finally, the experimental platform of frequency tracking control system is built to verify the correctness of the theory. Firstly, the inconsistency of power and efficiency of the system is verified experimentally. Secondly, the optimal power, the optimal efficiency and the synchronous tracking of power efficiency are studied under the condition of whether frequency tracking is added or not. The real-time and reliability of the proposed frequency tracking control method for the magnetic coupling resonant radio energy transmission system is verified by experimental research, which further enriches the theoretical research of radio energy transmission technology. Promote the development of practical products.
【学位授予单位】：天津工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM724

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