ICPT系统双AC-DC-AC型拓扑与控制策略研究

发布时间：2018-07-23 19:16

【摘要】：感应耦合电能传输(ICPT)是一种新型的电能传输技术得到了广泛的研究和应用。传统的AC-DC-AC型ICPT系统存在整体效率低、控制复杂、功率密度小等缺点，限制了无线电能传输技术在实际系统中的应用和推广。由于系统负载具有明显的多变性和操作随意性，极易造成系统性能和稳定性的下降，所以如何提高负载随机变化条件下的系统稳定性，是亟需解决和研究的重要难题。论文采用双AC-DC-AC变换器技术，减少了滤波电容和调压环节，提高了变换效率和输入功率因数。基于阻抗分析法对LCL-S型拓扑进行分析，，得到了系统原边谐振电流的输入输出关系；针对由负载变化造成原边谐振电流动态波动，从而影响能量传输磁场的稳定性的问题，提出了基于原边系统的谐振电流包络稳恒控制策略；并针对电流有效值反馈法实际应用困难的问题，通过波形分析法简化了控制的复杂度，保证了系统在负载变换的情况下原边谐振电流的稳定性。最后还针对系统负载合法性和安全性的问题，介绍了一种实用的基于谐振电流峰值的非法负载检测方案。针对ICPT系统负载电压多样性的需求，结合系统副边能量变换特性，提出了两种输出电压可调控制的策略，分别是等脉宽斩波控制和整谐振正弦半波间歇控制。并对这两种控制策略的计算过程进行了推导,最后总结了输出电压可调控制的软开关实现方法与间歇方式的选择。最后，基于MATLAB仿真软件和实验系统对控制器的稳定性进行了验证。仿真与实验结果表明本文所设计的谐振电流包络稳恒控制系统在负载变化的情况下具有较好的稳定性，并验证了输出电压可调控制策略能够满足负载电压多样性的需求。
[Abstract]:Inductively coupled power transmission (ICPT) is a new type of power transmission technology which has been widely studied and applied. The traditional AC-DC-AC ICPT system has the disadvantages of low efficiency, complex control and low power density, which limits the application and popularization of radio energy transmission technology in practical systems. Because the system load has obvious variability and random operation, it is easy to cause the degradation of system performance and stability. Therefore, how to improve the stability of the system under the condition of random variation of load is an important problem to be solved and studied urgently. In this paper, double AC-DC-AC converter technology is used to reduce the filter capacitance and voltage regulation, and to improve the conversion efficiency and input power factor. Based on the analysis of LCL-S topology based on impedance analysis, the input and output relationship of the primary resonant current of the system is obtained, and the dynamic fluctuation of the primary resonant current caused by the change of load affects the stability of the magnetic field of energy transmission. The resonant current envelope stabilization control strategy based on the original edge system is proposed, and the complexity of the control is simplified by waveform analysis method, which is difficult to apply to the practical application of the current RMS feedback method. The stability of the resonant current of the system is ensured under the condition of load conversion. Finally, aiming at the problem of system load legality and security, a practical illegal load detection scheme based on peak resonant current is introduced. In order to meet the demand of load voltage diversity in ICPT system, two kinds of output voltage adjustable control strategies are proposed, which are equal pulse width chopping control and full resonant half-wave intermittent control, combined with the energy conversion characteristics of the secondary side of the system. The calculation process of the two control strategies is deduced. Finally, the realization method of the output voltage adjustable control and the selection of the intermittent mode are summarized. Finally, the stability of the controller is verified based on MATLAB simulation software and experimental system. The simulation and experimental results show that the resonant current envelope stability control system designed in this paper has good stability in the case of load change, and it is verified that the output voltage adjustable control strategy can meet the requirements of load voltage diversity.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM724

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