反激式微型光伏逆变器的理论建模、仿真及实验研究
发布时间：2018-11-09 21:14
【摘要】：近几年,随着科技的发展,社会的进步,能源紧缺问题越来越受到人们的重视。开发新能源成为了当今的热门话题。新能源是一种非常规的能源,传统能源外的能源,如太阳能、风能、地热能、海洋能等。而其中太阳能是一种清洁和可再生能源,太阳能的开发和利用将有助于缓解目前的能源危机和环境危机。而光伏并网发电系统能够将太阳能转换成电能,它是非常有效的太阳能利用方式。而逆变技术是光伏发电系统中的必备技术,每块光伏组件都对应有微型光伏并网逆变器,可以有效的提高并网的效率。因此研究微型光伏逆变器是很有价值的。本文首先对微型逆变器的具体结构、微型逆变器的特点进行了介绍。再针对微型光伏逆变器进行了研究,分析了国内外微型光伏逆变器的研究现状以及其拓扑结构,给出了一种比较合适、高效的逆变器电路结构。详细的阐述了逆变器的并网控制器的方式,对各种控制方式进行了分析,提出了一种新的逆变器的控制方式。然后对逆变器的电路进行分析,阐述其工作原理,并建立了逆变器的数学模型。再对逆变器中的变压器参数、输入输出电容的参数进行计算,建立了逆变器matlab/simulink仿真模型,并针对前级输入电流设计了逆变器的控制器。为了提高微型逆变器的并网效率,对微型逆变器的仿真模型进行了改进,对逆变器的两路电流进行检测,从而建立了matlab/simulink双电流控制模型,验证了其可行性。由于PI控制不能有效的抑制谐波,尤其是对过零点处的谐波,因此本文提出PI多谐振的控制方式。根据根轨迹法来确定PI多谐振控制器的各个参数,并通过仿真进行了验证。还对不同的控制方法进行了研究,进行了仿真,并且进行了比较分析。建立了准谐振控制器、多谐振控制器、PI谐振控制器作用下的仿真模型,并对仿真结果的并网电流的THD值进行分析。最后本文根据逆变器的主电路拓扑结构,设计了一款微型光伏逆变器的硬件电路,对逆变器的控制电路和各个部分的驱动电路进行了详细的介绍。按照逆变器的整体结构,以供电电路、输入输出电路、检测电路、控制电路等形式,对其整体功能进行详细的说明。还对控制芯片的功能分布进行了分析,对逆变器的硬件工作原理进行了阐述。
[Abstract]:In recent years, with the development of science and technology and social progress, energy shortage has been paid more and more attention. The development of new energy has become a hot topic today. New energy is an unconventional energy, traditional energy sources, such as solar, wind, geothermal, oceanic energy and so on. Solar energy is a kind of clean and renewable energy, the development and utilization of solar energy will help to alleviate the current energy crisis and environmental crisis. Photovoltaic grid-connected power generation system can convert solar energy into electric energy, it is a very effective way to use solar energy. The inverter technology is a necessary technology in photovoltaic power generation system. Each photovoltaic module has a miniature photovoltaic grid-connected inverter, which can effectively improve the efficiency of grid-connected. So it is very valuable to study the miniature photovoltaic inverter. In this paper, the structure of the micro inverter and the characteristics of the micro inverter are introduced. The research status and topology of miniature photovoltaic inverter at home and abroad are analyzed, and a more suitable and efficient inverter circuit structure is given. The mode of grid-connected controller of inverter is described in detail, various control modes are analyzed, and a new control mode of inverter is proposed. Then the circuit of the inverter is analyzed, the working principle of the inverter is expounded, and the mathematical model of the inverter is established. Then the transformer parameters and the input / output capacitance parameters of the inverter are calculated, the matlab/simulink simulation model of the inverter is established, and the inverter controller is designed for the former stage input current. In order to improve the grid-connection efficiency of the micro-inverter, the simulation model of the micro-inverter is improved, the two-channel current of the inverter is detected, and the dual-current control model of matlab/simulink is established, which verifies its feasibility. Because PI control can not suppress harmonics effectively, especially for the harmonics at zero crossing point, the PI multi-resonance control method is proposed in this paper. According to the root locus method, the parameters of PI multi-resonance controller are determined and verified by simulation. Different control methods are studied, simulated and compared. The simulation model of quasi-resonant controller, multi-resonance controller and PI resonant controller is established, and the THD value of grid-connected current of simulation results is analyzed. Finally, according to the topology of the main circuit of the inverter, a hardware circuit of the miniature photovoltaic inverter is designed. The control circuit of the inverter and the driving circuit of each part are introduced in detail. According to the whole structure of the inverter, the whole function of the inverter is explained in detail in the form of power supply circuit, input and output circuit, detection circuit, control circuit and so on. The function distribution of the control chip is also analyzed, and the working principle of the inverter hardware is expounded.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM464
本文编号：2321579
[Abstract]:In recent years, with the development of science and technology and social progress, energy shortage has been paid more and more attention. The development of new energy has become a hot topic today. New energy is an unconventional energy, traditional energy sources, such as solar, wind, geothermal, oceanic energy and so on. Solar energy is a kind of clean and renewable energy, the development and utilization of solar energy will help to alleviate the current energy crisis and environmental crisis. Photovoltaic grid-connected power generation system can convert solar energy into electric energy, it is a very effective way to use solar energy. The inverter technology is a necessary technology in photovoltaic power generation system. Each photovoltaic module has a miniature photovoltaic grid-connected inverter, which can effectively improve the efficiency of grid-connected. So it is very valuable to study the miniature photovoltaic inverter. In this paper, the structure of the micro inverter and the characteristics of the micro inverter are introduced. The research status and topology of miniature photovoltaic inverter at home and abroad are analyzed, and a more suitable and efficient inverter circuit structure is given. The mode of grid-connected controller of inverter is described in detail, various control modes are analyzed, and a new control mode of inverter is proposed. Then the circuit of the inverter is analyzed, the working principle of the inverter is expounded, and the mathematical model of the inverter is established. Then the transformer parameters and the input / output capacitance parameters of the inverter are calculated, the matlab/simulink simulation model of the inverter is established, and the inverter controller is designed for the former stage input current. In order to improve the grid-connection efficiency of the micro-inverter, the simulation model of the micro-inverter is improved, the two-channel current of the inverter is detected, and the dual-current control model of matlab/simulink is established, which verifies its feasibility. Because PI control can not suppress harmonics effectively, especially for the harmonics at zero crossing point, the PI multi-resonance control method is proposed in this paper. According to the root locus method, the parameters of PI multi-resonance controller are determined and verified by simulation. Different control methods are studied, simulated and compared. The simulation model of quasi-resonant controller, multi-resonance controller and PI resonant controller is established, and the THD value of grid-connected current of simulation results is analyzed. Finally, according to the topology of the main circuit of the inverter, a hardware circuit of the miniature photovoltaic inverter is designed. The control circuit of the inverter and the driving circuit of each part are introduced in detail. According to the whole structure of the inverter, the whole function of the inverter is explained in detail in the form of power supply circuit, input and output circuit, detection circuit, control circuit and so on. The function distribution of the control chip is also analyzed, and the working principle of the inverter hardware is expounded.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM464
【参考文献】
相关期刊论文 前1条
1 李鹏飞;;光伏并网微型逆变器的分析[J];科技创新与应用;2013年26期
，本文编号：2321579
本文链接：https://www.wllwen.com/kejilunwen/dianlilw/2321579.html
教材专著
