毕业设计（论文）-超级电容器储释能双向变换器设计与仿真.doc

本科毕业设计（论文） 超级电容器储释能双向变换器设计与仿真 燕 山 大 学 2012年6月 摘要 超级电容器是一种新型绿色储能器件，具有充放电速度快、功率密度大、循环寿命长、高低温性能好等储能优势，此外，还具有免维护、无污染等优点，在储能领域将具有广阔的前景。本文以独立光伏发电系统为例，研究了超级电容器在储能领域中的应用。 本文设计了。首先分析了超级电容器的储能原理，研究了超级电容器的充放电特性，介绍了应用于超级电容器储能系统中的双向DC/DC变换器。对搭建的超级电容器储能系统的超级电容器组、主电路和控制电路进行了设计。由于超级电容器储能系统主要应用于解决电能的供需不平衡，所以超级电容器储能系统中的双向DC/DC变换器有两种工作模式：超级电容器组从光伏电池吸收能量储能时，双向DC/DC变换器工作于Buck电路模式；超级电容器组向负载释放能量时，双向DC/DC变换器工作于Boost电路模式。 最后对超级电容器储能系统的两种工作模式进行了仿真。仿真结果表明，通过对超级电容器储能系统中超级电容器组的设计和双向DC/DC变换器的闭环控制设计，超级电容器储能系统能够实现解决电能供需不平衡。 关键词　超级电容器；双向DC/DC变换器；储能；充放电；光伏 Abstract As a green energy storage device，super-capacitor has the advantages in the energy shortage, including a fast charging and discharging speed, high power density, long cycle life, high and low temperature performance. In addition, it also has the maintenance-free, no pollution etc. On account of that, it has broad prospects in the energy storage. The applications of super-capacitor in the field energy storage were studied in the paper with stand-alone photovoltatic(PV) system as an example. This paper designs a system based on super-capacitor for storing energy. The super-capacitor energy storage principle was analyzed，.Super-capacitor charge-discharge characteristics were studied , And the DC/DC converter for the super-capacitor energy system were introduce .The super-capacitor bank，the main circuit hardware and the control circuit hardware used in super-capacitor energy storage system is designed. Because the super-capacitor energy storage system used in this paper is to solve the problem of the imbalance between energy supply and demand. So，the bi-directional DC/DC converter used in the super-capacitor energy storage system has two operating modes: When the super-capacitor energy storage system absorbed energy from the Photovoltaic battery, the bi-directional DC/DC converter works in Buck mode. When the super-capacitor energy storage system release energy to the Photovoltaic battery , the bi-directional DC/DC converter works i