单相两级式光伏并网逆变器的研究

发布时间：2018-02-25 23:15

本文关键词： 光伏发电拓扑结构最大功率点跟踪并网逆变　出处：《北京工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：太阳能光伏发电是太阳能利用的一种重要形式,是采用太阳能电池将光能转换为电能的发电方式,而且随着技术的不断进步,光伏发电是最具发展前景的发电技术之一。本文以单相光伏并网发电逆变系统为研究对象,对光伏并网系统拓扑结构、最大功率点跟踪方法与并网逆变控制策略等问题进行了深入的研究。本文首先分析对比了两类单相光伏并网系统拓扑结构,在确定采用双极式拓扑结构的基础上,对系统整体的控制方案作了阐述,并对两种整体控制方案各自的优缺点进行了系统的探讨。其次,建立了光伏电池的仿真模型,阐明了光伏阵列的输出特性,分析对比了三种常用最大功率点跟踪方法,并采用了变步长综合最大功率点跟踪控制法,通过仿真验证了其方法的优越性。再次,概述了基于电网电压定向的电压电流双闭环的并网逆变控制策略,建立的其相应的数学模型,针对三种常用全桥逆变SPWM调制方式,通过仿真进行了分析与对比；在Matlab/Simulink仿真环境下,创建了单相两级式光伏并网逆变系统的仿真模仿,验证了控制策略的可行性。最后,设计实现了光伏并网系统硬件与软件,搭建了单相两级式光伏并网系统实验平台；在此平台上,进行了不同最大功率点跟踪控制方法的对比性实验与模拟并网逆变实验。实验结果充分验证了所设计的单相两极光伏并网逆变系统的可行性。
[Abstract]:Solar photovoltaic power generation is an important form of solar energy utilization, is the use of solar cells to convert light energy to electricity generation, and with the development of technology, Photovoltaic generation is one of the most promising generation technologies. In this paper, single-phase photovoltaic grid-connected inverter system is taken as the research object, and the topology of grid-connected photovoltaic system is discussed. The maximum power point tracking method and grid-connected inverter control strategy are studied in detail. In this paper, the topology of two kinds of single-phase photovoltaic grid-connected system is analyzed and compared. On the basis of determining the bipolar topology, the overall control scheme of the system is described. The advantages and disadvantages of the two control schemes are discussed systematically. Secondly, the simulation model of photovoltaic cell is established, the output characteristics of photovoltaic array are clarified, three common maximum power point tracking methods are analyzed and compared, and the variable step size integrated maximum power point tracking control method is adopted. The superiority of the method is verified by simulation. Thirdly, this paper summarizes the voltage and current double closed-loop grid-connected inverter control strategy based on voltage orientation of power network, establishes its corresponding mathematical model, and analyzes and compares three common full-bridge inverter SPWM modulation methods through simulation. The simulation simulation of single-phase two-stage photovoltaic grid-connected inverter system is established in the Matlab/Simulink simulation environment, and the feasibility of the control strategy is verified. Finally, the hardware and software of photovoltaic grid-connected system are designed and implemented, and the experimental platform of single-phase two-stage photovoltaic grid-connected system is built. Comparative experiments and simulated grid-connected inverter experiments with different maximum power point tracking control methods are carried out. The experimental results fully verify the feasibility of the designed single-phase bipolar photovoltaic grid-connected inverter system.
【学位授予单位】：北京工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM615;TM464

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