独立光伏发电MPPT策略与混合储能系统的研究
发布时间：2018-09-02 08:49
【摘要】：随着化石燃料消耗的增加,加剧了世界性能源短缺以及由此引起的环境污染问题。太阳能作为清洁、安全、持久、可靠的绿色能源逐渐成为人类研究开发的热点,而其中独立光伏发电系统因其经济、简单、灵活等优点在我国农村和边远地区有着广阔的市场,本文主要针对独立光伏发电系统中的最大功率点跟踪和混合储能技术进行细致的探究。 本文首先介绍了太阳能电池的发电原理、输出特性,并在此基础上给出光伏电池的数学模型。对光伏阵列最大功率点跟踪算法进行深入的分析和研究,在传统电导增量法的基础上,给出一种新颖的变步长电导增量法,仿真和实验结果证明了该算法既提高了最大功率点的追踪速度,又改善了最大功率点跟踪的稳定性,减少了功率损失。 光伏发电系统的储能环节至关重要,论文对当前研究热点和成果进行概括和总结,再分析由超级电容器与蓄电池组成的混合储能系统的研究成果的基础上,通过新型软开关DC-DC变换器连接蓄电池和超级电容器,实现开关管的零电流和零电压关断,消除开关损耗。混合储能系统充分利用蓄电池能量密度大和超级电容器功率密度大、循环使用寿命长等优点,可显著提高储能系统的性能。 最后,实验设计一台3KW独立光伏发电平台装置,选用BOOST作为升压变换器,对系统的硬件电路进行设计,并详细分析了电路中的元件选型和参数计算,以DSP芯片TMS320LF2812为控制核心,实时对独立光伏发电系统进行监控,实验结果证明了该装置的有效性。
[Abstract]:With the increase of fossil fuel consumption, the shortage of world energy and the environmental pollution caused by it have been aggravated. Solar energy, as a clean, safe, lasting and reliable green energy, has gradually become a hot spot of human research and development. Among them, the independent photovoltaic power generation system has the advantages of economy, simplicity and flexibility in rural and remote areas of China. There is a broad market, this paper focuses on the maximum power point tracking and hybrid energy storage technology in the stand-alone photovoltaic power generation system.
In this paper, the principle and output characteristics of solar cells are introduced firstly, and then the mathematical model of photovoltaic cells is given. The maximum power point tracking algorithm of photovoltaic arrays is analyzed and studied in depth. Based on the traditional conductance increment method, a novel variable step conductance increment method is presented, and the simulation and experimental results are verified. It is shown that this algorithm not only improves the tracking speed of the maximum power point, but also improves the stability of the maximum power point tracking and reduces the power loss.
The energy storage link of photovoltaic power generation system is very important. This paper summarizes the current research hotspots and achievements. On the basis of analyzing the research results of hybrid energy storage system composed of super capacitors and storage batteries, a new type of soft-switching DC-DC converter is used to connect storage batteries and super capacitors to realize the zero-current sum of switching transistors. The hybrid energy storage system can make full use of the advantages of high battery energy density, high supercapacitor power density, long cycle life and so on, which can significantly improve the performance of the energy storage system.
Finally, a 3KW stand-alone photovoltaic power generation platform is designed experimentally, and BOOST is selected as boost converter. The hardware circuit of the system is designed, and the component selection and parameter calculation are analyzed in detail. The DSP chip TMS320LF2812 is used as the control core to monitor the stand-alone photovoltaic power generation system in real time. The experimental results prove that the system is effective. The effectiveness of the device.
【学位授予单位】：江南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM615
本文编号：2218852
[Abstract]:With the increase of fossil fuel consumption, the shortage of world energy and the environmental pollution caused by it have been aggravated. Solar energy, as a clean, safe, lasting and reliable green energy, has gradually become a hot spot of human research and development. Among them, the independent photovoltaic power generation system has the advantages of economy, simplicity and flexibility in rural and remote areas of China. There is a broad market, this paper focuses on the maximum power point tracking and hybrid energy storage technology in the stand-alone photovoltaic power generation system.
In this paper, the principle and output characteristics of solar cells are introduced firstly, and then the mathematical model of photovoltaic cells is given. The maximum power point tracking algorithm of photovoltaic arrays is analyzed and studied in depth. Based on the traditional conductance increment method, a novel variable step conductance increment method is presented, and the simulation and experimental results are verified. It is shown that this algorithm not only improves the tracking speed of the maximum power point, but also improves the stability of the maximum power point tracking and reduces the power loss.
The energy storage link of photovoltaic power generation system is very important. This paper summarizes the current research hotspots and achievements. On the basis of analyzing the research results of hybrid energy storage system composed of super capacitors and storage batteries, a new type of soft-switching DC-DC converter is used to connect storage batteries and super capacitors to realize the zero-current sum of switching transistors. The hybrid energy storage system can make full use of the advantages of high battery energy density, high supercapacitor power density, long cycle life and so on, which can significantly improve the performance of the energy storage system.
Finally, a 3KW stand-alone photovoltaic power generation platform is designed experimentally, and BOOST is selected as boost converter. The hardware circuit of the system is designed, and the component selection and parameter calculation are analyzed in detail. The DSP chip TMS320LF2812 is used as the control core to monitor the stand-alone photovoltaic power generation system in real time. The experimental results prove that the system is effective. The effectiveness of the device.
【学位授予单位】：江南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM615
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