【作者】 王智慧；

【导师】 孙跃；

【作者基本信息】 重庆大学 ， 控制理论与控制工程， 2009， 博士

【摘要】 在非接触电能传输系统中,传统的电能传输模式存在整体效率低、控制复杂、输入功率因数低、功率密度小、成本较高等缺点,在很大程度上限制了非接触电能传输技术的推广和应用。本文以国家自然科学基金项目为依托,针对传统传输模式存在的问题,旨在提出一种基于包络线调制机理的能量传输模式,并围绕该模式对几种典型非接触电能传输系统结构进行研究,提出相应结构下的新型电路拓扑及控制方式。本文主要进行了以下几个方面的研究工作:1.分析了传统供电方式存在的不足和非接触电能传输技术研究的必要性,并综述了国内外理论研究和产业化现状。分析了传统非接触电能传输模式存在的问题,阐明了本文的研究目的、内容和意义。2.提出了基于包络线调制机理的非接触电能传输模式,该模式以负载电能形式为目标,采用载波调制技术,实现电能变换与传输。论文系统分析研究了该模式机理、系统基本框架及相关关键技术,并以全桥串联谐振电路为例从理论上研究了包络线调制传输模式的可行性;对比分析了该模式的优点。3.分析了采用传统传输模式的AC-AC型非接触电能传输系统存在的缺点,研究了包络线调制传输模式下的系统结构。提出了一种新型AC-DC-AC变换拓扑,对采用该拓扑的AC-AC型非接触电能传输系统的初级回路和次级回路的工作模态进行了分析,研究给出了该拓扑实现软开关的条件和系统动态解析模型。对该拓扑进行了仿真分析和实验验证。4.分析了传统传输模式下DC-AC型非接触电能传输系统存在的缺点,并提出了基于包络线调制模式的系统结构,简化了系统电路拓扑和控制方式,提升了系统整体效率和系统功率密度。以不对称DC-AC拓扑为例,研究了该结构实现包络线调制的方式,并利用状态空间法建立了系统的稳态模型,进行了仿真分析和实验验证。5.提出了基于包络线调制传输模式的AC-DC型非接触电能传输系统结构,给出了一种适用于该结构的能量注入式AC-AC变换拓扑,分析了该拓扑的系统特性。提出了能量临界平衡的判定方法、包络线预估方法及相应的最优控制策略,并进行了仿真分析和实验验证。6.提出了一种新的电流型CPT系统电路拓扑,以实现输入电压及系统耦合参数不变时包络线的宽范围调幅。建立了该系统的稳态等效模型,并在此基础上推导出了系统控制特性和关键参数的计算方法,并进行了仿真分析和实验验证,为系统的设计与分析提供了理论依据。本论文的主要创新性贡献在于:1.提出了一种基于包络线调制机理的非接触电能传输模式。该模式面向负载电能形式需求,采用电能载波与调制技术,实现非接触电能传输。解决了传统传输模式下系统功率因数低、功率密度不高等问题,提高了系统效率,拓展了非接触电能传输技术的应用领域。2.基于Buck和Boost思路,结合电流型CPT系统的特点提出了一种能够灵活控制系统传输功率的变换拓扑,实现了包络线幅值的宽范围调节,大大提高了负载适应能力。该拓扑可以推广到一般的电能变换应用中。3.提出了一种谐振能量控制策略,通过实时调节谐振回路能量注入模式,实现AC-AC高频变换拓扑的恒幅包络线调制。该策略可推广应用于其它类型包络线的调制。更多还原

【Abstract】 In contactless power transfer (CPT) systems, the disadvantages of traditional power transfer mode have limited the application of CPT technology. The main disadvantages include low efficiency, complicated control, low input power factor, low power density, high cost and so on. To overcome these disadvantages, this paper presented a novel power transfer mode based on an envelope modulation method, funded by National Natural Science Foundation of China. Several typical CPT systems are studied for the novel power transfer mode. And corresponding circuit topology and control methods are optimized according to different power supply demands. The main works of the paper include:1. The drawbacks of direct contact power supply mode and the necessity of developing CPT technology are analyzed. The fundamental theory and research status introduction (include theory and industrialization) have been reviewed. And the research aim, contents and significance are given based on drawbacks analysis of the traditional contactless power transfer mode.2. A novel energy transfer mode based on envelope modulation is presented. This mode achieves power conversion and transfer by carrier modulation technology according to load power requirements. The fundamental theory, the basic system structures and the relative key techniques are studied in detail. A full bridge series tuned resonant circuit is taken for example to investigate the feasibility of this envelope modulation mode. The advantages of this envelope modulation mode are presented compared with the traditional power transfer mode.3. The drawbacks of AC-AC type CPT system with traditional power transfer mode are analyzed. The system structure under envelope modulation transfer mode is studied. A novel AC-DC-AC conversion topology is proposed. In an AC-AC type CPT system with this proposed topology, the operating modes of both primary and secondary resonant tanks are analyzed. And the soft-switching condition of this topology and the system dynamic analytical model are obtained consequently. Both simulation and experiment results verifies the proposed topology.4. The drawbacks of DC-AC type CPT system with traditional power transfer mode are analyzed and a system structure under envelope modulation transfer mode is proposed. In the proposed structure, the system circuits and control strategy are simplified, and the systematic efficiency and the power density are promoted. An asymmetric DC-AC topology is taken for consideration to study the envelope modulation mechanism. The system steady-state model is built up with state space method and verified by both simulation and experiment results.5. An AC-DC type CPT system structure based on envelope modulation mode is presented. An energy injection AC-AC type topology is proposed for the structure. Its system characteristics are analyzed. The energy critical equilibrium criterion, envelope prediction method and optimal control strategy are presented in sequence. Simulation and experiment results verify the analysis results.6. A novel circuit topology for current-fed CPT system is proposed to realize wide magnitude envelope modulating on the condition that input voltage and couple parameters are constant. The steady-state equivalent model is built up, based on which, the control characteristics and key parameters design formulas are derived and verified by both experiment and simulation results. The theoretical results are helpful for system design and analysis.The main contributions of this paper are as follows.1. A contactless power transfer mode based on envelope modulation technology is presented. This mode is load power requirement oriented. Power carrier and modulating technology is employed to achieve contactless power transfer. The disadvantages of traditional power transfer mode, such as low power factor, low power density etc., are overcome and the systematic efficiency is increased. With the proposed modulation technology, the application fields of CPT technology are extended.2. A converter topology, which can realize flexible control of transferred power, is proposed according to Buck and Boost principles and the current-fed CPT system characteristics. The envelope magnitude can realize wide range adjustment with the proposed topology. Therefore, the load adaptive ability of the system is extended greatly. The topology can also be applied to general power conversions.3. A novel control strategy of the resonant power is proposed which realizes constant magnitude envelope modulation in an AC-AC high frequency conversion topology by adjusting the injected power of the resonant tank dynamically. The strategy can also be applied to other type envelope modulations.更多还原