非对称耦合高频电源自适应跟踪算法研究

发布时间：2018-06-13 15:28

本文选题：非对称耦合 + 软开关　；参考：《天津工业大学》2017年硕士论文

【摘要】：气候变化,能源短缺等问题是人类社会面临的长期问题。交通领域的尾气排放、能源消耗等问题能否得到有效解决直接影响人类的生活质量,被称为绿色能源的电动汽车再次成为人们研究的焦点问题。无线电能传输(WPT)技术是一种安全,便捷有效的新型充电方式,可以作为电动汽车充电方式的有效补充。针对该技术的特点以及其中存在的一些问题,本文从系统的工作模式、拓扑结构以及控制算法等方面进行了研究,并提出了改进方案。一、针对电磁场中耦合模理论和电场中的电路理论,建立无线电能传输技术的数学模型,并针对其中特有的传输特性的成因进行了讨论。研究了系统功率最大值的临界状态以及系统出现频率分裂现象的原因,同时探讨了过耦合状态下系统功效矛盾的产生机理。二、针对WPT系统的能效特性,提出了一套高能效及强鲁棒性的无线电能传输电源方案。首先针对电网侧谐波污染问题,设计了一种基于WPT系统的平均电流控制的功率因数校正方法对谐波污染进行改善,并对系统的功率因数校正部分进行了小信号数学模型建立,探讨了满足系统稳定性的条件。同时基于WPT系统的频率稳定性问题,提出了一种基于PI控制的频率追踪方法,并建立了时域的闭环传递函数,探讨了频率稳定的先决条件。设计搭建了一套300W的实验样机系统,对电源频率跟踪特性、功率稳定特性以及系统距离特性和方向特性等进行了实验分析。三、最后考虑IPT系统中多储能谐振网络非线性动力学特性,利用广义状态空间平均法,建立了无线电能传输系统的通用简化模型,并且对外界扰动和各类不确定性因素造成的频率稳定问题进行研究。提出了一种基于发射端电流的改进自适应跟踪控制方法,利用自抗扰控制中将不确定性因素视为外扰的思想,在此基础上设计了适用于感应耦合式无线能量传输的自适应跟踪控制方案。通过仿真结果表明,此自适应跟踪控制器具有很强的鲁棒性,可以在系统状态参数或者输入输出量发生剧烈变化时,对系统发射端电路进行高速稳定控制,具有很强的应用价值。
[Abstract]:Climate change and energy shortage are long-term problems facing human society. Whether the problems of exhaust emissions and energy consumption in the field of transportation can be effectively solved directly affect the quality of human life, the electric vehicle (EV), which is called green energy, has once again become the focus of people's research. Radio energy transmission (WPTT) technology is a safe, convenient and effective new charging method, which can be used as an effective supplement to electric vehicle charging mode. Aiming at the characteristics of the technology and some problems, this paper studies the working mode, topology structure and control algorithm of the system, and puts forward an improved scheme. Firstly, the mathematical model of radio energy transmission technology is established according to the coupled mode theory in electromagnetic field and the circuit theory in electric field, and the causes of its special transmission characteristics are discussed. The critical state of the maximum power of the system and the cause of frequency splitting are studied, and the mechanism of the system efficiency contradiction under the over-coupling state is also discussed. Secondly, according to the energy efficiency characteristics of WPT system, a set of high energy efficiency and strong robustness radio energy transmission power supply scheme is proposed. Firstly, a power factor correction method based on the average current control of WPT system is designed to improve the harmonic pollution, and the small signal mathematical model of the power factor correction part of the system is established. The conditions satisfying the stability of the system are discussed. At the same time, based on the frequency stability of WPT system, a frequency tracking method based on Pi control is proposed, and the closed-loop transfer function in time domain is established, and the precondition of frequency stability is discussed. A 300W experimental prototype system is designed and built. The characteristics of power frequency tracking, power stability, system distance and direction are analyzed experimentally. Thirdly, considering the nonlinear dynamic characteristics of multi-energy storage resonance network in IPT system, the generalized state space averaging method is used to establish a general simplified model of radio energy transmission system. And the frequency stability problem caused by external disturbance and various uncertain factors is studied. An improved adaptive tracking control method based on emitter current is proposed. Based on this, an adaptive tracking control scheme for induction coupled wireless energy transmission is designed. The simulation results show that the adaptive tracking controller is robust and can be used to control the transmitter circuit at high speed when the system state parameters or input / output parameters change dramatically. It has strong application value.
【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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