【作者】 吕茵；

【导师】 杨苹；

【作者基本信息】 华南理工大学 ， 电力电子与电力传动， 2011， 硕士

【摘要】 现代社会的快速发展导致能源需求激增和环境污染严重,为此,世界各国纷纷投入人力物力进行可再生能源的开发利用。技术的进步使得太阳能发电成本不断下降,令其成为最具商业利用价值的可再生能源之一。由于大型太阳能电站的随机功率波动对电网的冲击较大,影响电网的安全运行,小型分散式光伏系统可更好地解决边远地区分散用户的用电问题。在此背景下,本文对小型光伏发电系统的关键技术进行了较为深入的研究。主要内容如下:(1)在分析单相光伏并网逆变器拓扑的基础上,提出了带变压器的两级式能量变换结构,即有最大功率跟踪功能的BOOST电路和单相全桥逆变电路;(2)研究了太阳能电池数学模型及其特性,指出了对光伏阵列进行最大功率跟踪的必要性,分析了多种常用的最大功率跟踪算法;(3)基于光伏并网逆变器的控制目标,研究了光伏并网逆变器的常用控制方法,结合单周控制策略,提出一种基于单周-PI控制的逆变算法,并对其进行仿真分析,验证了其有效性。在以上研究工作的基础上,开发出一套以TMS320LF2407数字信号处理芯片为控制器的1KW单相光伏并网逆变样机,完成了硬件电路参数设计,软件编写调试,并进行了实验调试,实验结果表明该系统能够实现本文设计的方案。本论文课题来源于广东省绿色能源技术重点实验室项目:广东省科技计划项目(2010A010200004)、广东省教育部产学研结合项目(2009B090300424)更多还原

【Abstract】 The rapid development of social economy leads to greater energy consumption and environment pollution, thus, nations around the world make great effort to exploit renewable energy . Solar energy cost is go down due to advanced technologies, and it has become one of the most promising renewable energy. The large-scale PV generating station would have strong impact to the power grid because of its random power fluctuation. The small-scale PV generation system can avoid such problem and solve the issue of remote area power supply. Under this back ground, this paper will do intensive research on key technologies of small-scale PV generation system. The contents are shown as follows:(1) Based on analysis of single phase PV inverter, a two stage energy convert structure is proposed, that is, BOOST converter with MPPT and single phase full bridge inverter.(2) Through study of the PV cell’s mathematical model and characteristic, necessity of MPPT is pointed out. A improved P&O algorithm is proposed based on study of traditional algorithms. Simulations are carried out to verify the feasibility.(3) Aiming at the control strategy, common control methods are studied, combined with one cycle control, a PI-one cycle control is proposed. Simulations are carried out to verify the feasibility.Based on the above analysis, a 1KW grid-connected PV inverter prototype is developed, it is controlled by TI DSP TMS320LF2407. Based on the theoretical analysis, this paper designed the hardware and software of the inverter. Through experiment and debugging, the results and waveforms are as expected, which laid foundation for further research.Topic of this paper comes from the projects of Guangdong Key Laboratory of Clean Energy Technology: science and technology project of Guangdong(2010A010200004), produce-learn-research projects of Ministry of Education of Guangdong(2009B090300424).更多还原