基于Z源逆变器的单相光伏并网发电系统研究
发布时间：2018-11-14 10:27
【摘要】：随着工业对清洁、可再生能源的需求量越来越大,新能源开发已经变得越来越重要。其中,太阳能因其储量大、安全系数高等优势受到了越来越多国家的重视。近几年,光伏并网发电技术取得了长足进步,但依然存在很多亟需解决的问题,如光伏电池发电效率低、谐波含量高、并网电流波形不佳、存在孤岛效应等。针对这些问题,论文以光伏并网发电系统为研究对象,对Z源逆变器及其并网控制策略、光伏最大功率点跟踪技术、孤岛检测技术进行了深入的研究。在分析传统光伏逆变器拓扑结构及其存在局限性基础上,对Z源逆变器进行了研究,阐述了Z源逆变器的升压原理、换流过程、调制方法。仿真研究了光伏电池的输出特性,阐述了光伏最大功率点跟踪的原理以及传统控制策略的不足,研究了基于模糊控制的最大功率点跟踪策略。仿真表明,基于模糊控制的最大功率点跟踪策略相对于传统的扰动观察法控制策略,具有追踪速度快、输出功率稳定等优势。研究了采用电压电流双环控制的Z源光伏并网发电系统,首先研究了Z源逆变器的电压外环、电流内环的双闭环并网控制策略。之后,对并网过程中存在的孤岛现象进行了分析,阐述了孤岛检测的原理、检测方法,提出了基于正反馈的AFD孤岛检测技术。通过Matlab/Simulink仿真分析,验证了并网策略、孤岛检测方法的可行性。基于瑞萨HD64F2166VTE33V单片机设计了Z源光伏并网逆变器,设计了H桥逆变电路、电网电压采集电路、驱动电路,并编制系统软件。实验结果验证了理论分析以及仿真研究的正确性。
[Abstract]:New energy development has become more and more important as the demand for renewable energy is increasing in industry. Among them, solar energy has been paid more and more attention by more and more countries because of its large reserves and high safety factor. In recent years, photovoltaic grid-connected power generation technology has made great progress, but there are still many problems that need to be solved, such as low efficiency of photovoltaic cell generation, high harmonic content, poor grid-connected current waveform, island effect and so on. Aiming at these problems, this paper takes photovoltaic grid-connected power generation system as the research object, and deeply studies Z-source inverter and its grid-connected control strategy, photovoltaic maximum power point tracking technology and islanding detection technology. On the basis of analyzing the topology structure of traditional photovoltaic inverter and its limitation, the Z-source inverter is studied, and the boost principle, commutation process and modulation method of Z-source inverter are expounded. The output characteristics of photovoltaic cell are studied by simulation. The principle of photovoltaic maximum power point tracking and the shortcomings of traditional control strategy are described. The maximum power point tracking strategy based on fuzzy control is studied. The simulation results show that the maximum power point tracking strategy based on fuzzy control has the advantages of fast tracking speed and stable output power compared with the traditional disturbance observation control strategy. The Z-source photovoltaic grid-connected generation system with voltage and current double loop control is studied. Firstly, the voltage outer loop and the current inner loop of the Z-source inverter are studied. Then, the phenomenon of islanding in the process of grid connection is analyzed, the principle and method of islanding detection are expounded, and the AFD islanding detection technology based on positive feedback is put forward. The feasibility of grid-connected strategy and islanding detection method is verified by Matlab/Simulink simulation. The Z-source photovoltaic grid-connected inverter, H-bridge inverter, grid voltage acquisition circuit, driving circuit and system software are designed based on Raysa HD64F2166VTE33V microcontroller. The experimental results verify the correctness of the theoretical analysis and simulation.
【学位授予单位】：南京师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM464;TM615
本文编号：2330915
[Abstract]:New energy development has become more and more important as the demand for renewable energy is increasing in industry. Among them, solar energy has been paid more and more attention by more and more countries because of its large reserves and high safety factor. In recent years, photovoltaic grid-connected power generation technology has made great progress, but there are still many problems that need to be solved, such as low efficiency of photovoltaic cell generation, high harmonic content, poor grid-connected current waveform, island effect and so on. Aiming at these problems, this paper takes photovoltaic grid-connected power generation system as the research object, and deeply studies Z-source inverter and its grid-connected control strategy, photovoltaic maximum power point tracking technology and islanding detection technology. On the basis of analyzing the topology structure of traditional photovoltaic inverter and its limitation, the Z-source inverter is studied, and the boost principle, commutation process and modulation method of Z-source inverter are expounded. The output characteristics of photovoltaic cell are studied by simulation. The principle of photovoltaic maximum power point tracking and the shortcomings of traditional control strategy are described. The maximum power point tracking strategy based on fuzzy control is studied. The simulation results show that the maximum power point tracking strategy based on fuzzy control has the advantages of fast tracking speed and stable output power compared with the traditional disturbance observation control strategy. The Z-source photovoltaic grid-connected generation system with voltage and current double loop control is studied. Firstly, the voltage outer loop and the current inner loop of the Z-source inverter are studied. Then, the phenomenon of islanding in the process of grid connection is analyzed, the principle and method of islanding detection are expounded, and the AFD islanding detection technology based on positive feedback is put forward. The feasibility of grid-connected strategy and islanding detection method is verified by Matlab/Simulink simulation. The Z-source photovoltaic grid-connected inverter, H-bridge inverter, grid voltage acquisition circuit, driving circuit and system software are designed based on Raysa HD64F2166VTE33V microcontroller. The experimental results verify the correctness of the theoretical analysis and simulation.
【学位授予单位】：南京师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM464;TM615
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