应用于微型分布式风力发电系统中的LLC谐振变换器的研究
发布时间：2018-07-17 00:52
【摘要】：本文以新能源中风能的利用为研究背景,以微型分布式风力发电系统中的直流模块为研究对象。通过对文献的大量阅读,了解宽范围的DC/DC变换器的研究现状,针对微型分布式风力发电系统的特点给出了LLC谐振变换器作为其直流模块的设计方案。 首先通过对LLC谐振变换器原边开关管实现软开关的条件进行分析,提出了一种能够满足全范围满载实现ZVS的LLC励磁电感优化设计方法,并结合增益特性利用仿真手段完成谐振电感与电容设计优化变换器效率。给出了电路关键参数的选型与设计,分析了电路损耗,并制作一台300VA全桥升压型LLC样机完成实验验证。 对于LLC闭环设计,LLC的小信号分析是必不可少的,本文采用了扩展描述函数建立了完全谐振点处LLC的小信号模型,最后通过比较分析以及实验验证了模型建立的准确性。 针对LLC谐振变换器在微型分布式风力发电系统中的应用,本文给出了详细以全桥倍压型LLC为拓扑结构的设计方案。讨论了包含最大功率跟踪MPPT控制在内的系统DSP数字化控制策略；给出了软启动策略、风机电子刹车系统在内的系统软硬件保护的解决方案,并最终根据风力发电HUB项目要求制作一台500VA的样机以验证系统方案设计的可行性。 最后对本课题进行了总结与进一步的展望。
[Abstract]:In this paper, the use of new energy stroke energy as the research background, the DC module in the micro distributed wind power generation system as the research object. Based on a large number of literatures, the research status of wide range DC / DC converters is studied. According to the characteristics of micro distributed wind power system, the design scheme of LLC resonant converter as its DC module is presented. Firstly, by analyzing the condition of realizing soft switch in LLC resonant converter, an optimal design method of LLC excitation inductor is proposed, which can meet the full load of ZVS. The resonant inductance and capacitance are designed and optimized by using the gain characteristic. The selection and design of the key parameters of the circuit are given, the circuit loss is analyzed, and a 300VA full-bridge booster LLC prototype is made to complete the experimental verification. Small signal analysis of LLC is necessary for LLC closed-loop design. In this paper, an extended description function is used to establish a small signal model of LLC at a full resonance point. Finally, the accuracy of the model is verified by comparison, analysis and experiments. Aiming at the application of LLC resonant converter in micro distributed wind power generation system, this paper presents a detailed design scheme with full bridge voltage doubling type LLC as the topology. The digital control strategy of DSP, including MPPT control with maximum power tracking, is discussed, and the solution of soft start strategy and system hardware and software protection including fan electronic brake system is given. Finally, a 500VA prototype is made according to wind power Hub project to verify the feasibility of the system design. Finally, the paper summarizes and prospects the subject.
【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;TM614
本文编号：2128305
[Abstract]:In this paper, the use of new energy stroke energy as the research background, the DC module in the micro distributed wind power generation system as the research object. Based on a large number of literatures, the research status of wide range DC / DC converters is studied. According to the characteristics of micro distributed wind power system, the design scheme of LLC resonant converter as its DC module is presented. Firstly, by analyzing the condition of realizing soft switch in LLC resonant converter, an optimal design method of LLC excitation inductor is proposed, which can meet the full load of ZVS. The resonant inductance and capacitance are designed and optimized by using the gain characteristic. The selection and design of the key parameters of the circuit are given, the circuit loss is analyzed, and a 300VA full-bridge booster LLC prototype is made to complete the experimental verification. Small signal analysis of LLC is necessary for LLC closed-loop design. In this paper, an extended description function is used to establish a small signal model of LLC at a full resonance point. Finally, the accuracy of the model is verified by comparison, analysis and experiments. Aiming at the application of LLC resonant converter in micro distributed wind power generation system, this paper presents a detailed design scheme with full bridge voltage doubling type LLC as the topology. The digital control strategy of DSP, including MPPT control with maximum power tracking, is discussed, and the solution of soft start strategy and system hardware and software protection including fan electronic brake system is given. Finally, a 500VA prototype is made according to wind power Hub project to verify the feasibility of the system design. Finally, the paper summarizes and prospects the subject.
【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;TM614
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