1. 研究目的与意义（文献综述）

随着化石燃料耗量的增加,储量日益枯竭,伴随而来的环境问题愈发严重,发展可再生能源已迫在眉睫。

与传统能源相比，风能、太阳能等可再生能源取之不完、用之不竭，对环境无害或危害极小，且资源分布广泛，易转换为电能，适宜就地开发利用。

而可再生能源发电发电具有间歇性和不稳定性，这可能导致电力供需之间的不匹配。

2. 研究的基本内容与方案

本毕业设计将要完成基于cllc的双向dc/dc变换器控制方法的文献收集及外文文献翻译，cllc变换器的基本拓扑结构、数学模型、工作特性、参数设计、控制方法等的学习研究以及在matlab/simulink中实现cllc双向dc/dc变换器控制系统的仿真等。

目前大量关于cllc谐振变换器的研究都脱胎于传统的llc变换器，用于分析llc变换器增益特性的基波等效法（first harmonic approximation，fha）因其简单直观易用的特点同样被继承到了cllc变换器的分析中。

然而fha等效模型仅当开关频率在谐振频率附近时才具有较高的准确性，在设计输入或输出电压范围较宽的dc/dc变换器时，使用fha模型将带来十分明显的误差，往往难以满足设计要求。

3. 研究计划与安排

2018年2月26日 – 2018年3月10日 文献搜集及翻译
2018年3月11日 – 2018年4月10日 CLLC的原理及控制方法的学习
2018年4月11日 – 2018年5月8日 Simulink模型的搭建调试
2018年5月9日 – 2018年5月20日 结果分析总结撰写毕业论文

4. 参考文献（12篇以上）

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