基于V2G技术的双向AC-DC变换器及其关键技术研究

发布时间：2018-05-29 19:17

本文选题：电动汽车V2G技术 + 双向变换器　；参考：《浙江大学》2014年硕士论文

【摘要】：随着智能电网和电动汽车技术的发展,电动汽车V2G技术成为研究热点。所谓V2G技术,其核心思想是利用大量电动汽车充放电补偿由于可再生能源系统接入电网而带来的波动。电力电子装置是V2G技术中的核心和指令执行装置。其必须能够实现功率的双向流动,执行智能电网指令进行快速调节,控制输入输出电能质量。对于车载充放电器,还应具有高功率密度、长寿命等特点。因此,车载用双向变换器设计技术难度大,具有重要研究价值。论文绪论部分简要介绍了V2G系统的概念及其对电网的影响,对V2G技术在国内外的实践和面临的问题进行了综述。重点阐述了V2G技术中电力电子装置的位置、作用和拓扑结构,给出了一种两级式拓扑结构。然后,对国内外双向变换器的研究热点和发展趋势进行了分析,阐述了本课题的研究内容和主要工作。论文第二章内容集中在两级式变换器中双向AC-DC级参数设计、电路设计和损耗分析上。首先分析了电路的基本工作原理与运行模式,对电路的基本参数进行了计算与选定。效率优化方面,计算了充电模式与放电模式的功率损耗,分析主要功耗的组成,使用SiC二极管提升了系统整体效率。最后,对数字控制器资源分配和流程进行了设计。论文第三章重点研究了双向AC-DC变换器的控制策略。对比分析了几种可能实现PFC和并网逆变的控制策略,仿真比较了其优劣势。最终选择了基于占空比预测的数字PFC控制策略和准比例谐振控制器。在此基础上,设计控制环补偿器,对系统的动态、稳态性能进行仿真和实验验证。此外,本章还对软件锁相环和独立运行逆变器进行了阐述和设计。论文第四章研究了应用在电动汽车V2G技术中的功率解耦技术。对电流能大幅度变动的电池负载和普通负载分别给出了解耦控制策略。在此基础上提出改进型相位补偿和幅度补偿控制。分析了解耦的工作工程,设计和仿真验证了理论的正确性。第五章是本文整体系统的一种优化技术。提出了无吸收电路的软开关技术,该技术在不增加其他元件的基础上,利用副边调制,实现软开关。文章给出了仿真结果,证明了该技术的有效性。最后基于本文工作,对基于电动汽车V2G技术的双向变换器系统设计做出了总结和展望。
[Abstract]:With the development of smart grid and electric vehicle technology, the V2G technology of electric vehicle has become a hot topic. The core idea of the so-called V2G technology is to use a large number of electric vehicles to compensate for the fluctuation of the renewable energy system to access the power grid. The power electronic device is the core of the V2G technology and the instruction execution device. In order to realize the two-way flow of power, execute the instruction of smart grid for fast adjustment and control the power quality of input and output, it should also have the characteristics of high power density and long life for the vehicle charging and discharging equipment. Therefore, the design of two-way converter in vehicle is of great difficulty and has important research value.
The introduction part of the paper briefly introduces the concept of V2G system and its influence on the power grid, summarizes the practice and problems of V2G technology at home and abroad. It focuses on the position, function and topology of the power electronic device in V2G technology, and gives a kind of two stage extension structure. Then, the research on two-way converter at home and abroad. The hotspots and development trends are analyzed, and the research contents and main tasks of this subject are expounded.
The second chapter of the paper focuses on the design of two direction AC-DC level parameters, circuit design and loss analysis in the two stage converter. First, the basic principle and operation mode of the circuit are analyzed. The basic parameters of the circuit are calculated and selected. The efficiency optimization is used to calculate the power loss of the charging mode and discharge mode, and the main analysis is made. The composition of power consumption, the use of SiC diode to enhance the overall efficiency of the system. Finally, the digital controller resource allocation and process design.
The third chapter of the paper focuses on the control strategy of bidirectional AC-DC converter, compares and analyzes several control strategies that may realize PFC and grid inverter. The simulation compares its advantages and disadvantages. Finally, it selects the digital PFC control strategy based on the duty cycle ratio and the quasi proportional resonant controller. On this basis, the control loop compensator is designed and the system is designed. The dynamic and steady performance of the system is verified by simulation and experiment. In addition, the software phase locked loop and the independent running inverter are also described and designed in this chapter.
The fourth chapter of the paper studies the power decoupling technology used in the V2G technology of electric vehicle. The decoupling control strategy is given for the battery load and the ordinary load which can greatly change the current. On this basis, the improved phase compensation and amplitude compensation control are proposed. Correctness.
The fifth chapter is an optimization technique of the whole system. The soft switching technology of the non absorption circuit is put forward. The technology can realize soft switch by using side modulation without adding other components. The simulation results are given and the effectiveness of the technology is proved.
Finally, based on the work in this paper, we summarize and prospect the design of bi-directional converter system based on V2G technology of electric vehicle.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46

【参考文献】