基于DSP的单相小功率光伏并网逆变器设计

发布时间：2018-01-10 11:11

本文关键词：基于DSP的单相小功率光伏并网逆变器设计　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：全球经济飞速发展的同时,伴随着能源的巨大消耗。随着常规的化石能源逐渐枯竭,能源危机随时可能爆发,加快对新能源的开发利用已经迫在眉睫。在众多的新能源中,太阳能是非常具有开发潜力的。目前,光伏发电已经成为世界各国利用太阳能的主要方式。而光伏并网发电由于具有诸多优点已经成为了光伏发电的主要研究方向。本文对单相两级式非隔离型光伏并网逆变器的整个工作过程进行了较为深入的分析,对其所需要的关键技术进行了较为深入的研究,完成了光伏并网逆变器的硬件电路设计和软件程序编写以及实验调试工作。首先,对DC-DC变换器进行了深入的理论分析,指出了常规Boost变换器由于采用硬开关技术所带来的缺点,从而舍弃了采用常规Boost变换器的方案,将具有软开关技术的Boost-ZVT变换器运用到光伏并网逆变器系统中,详细的阐述了其工作原理,并对其关键参数进行了计算及选型。对常用的逆变输出滤波电路进行了对比分析,确定了滤波电路的结构,并对其参数选择进行了计算及选型。其次,在对光伏电池进行了深入理论分析后,在Matlab/SimuLink环境下搭建了其仿真模型,得到了光伏电池受到外界因素(光照强度和温度)干扰时的输出特性曲线。对光伏并网逆变器的MPPT、并网控制以及孤岛效应检测等关键技术进行了较为深入的研究,确定了本文所采用的控制策略。并在此基础之上,在Matlab/SimuLink环境下搭建了整个光伏并网逆变器的仿真模型,验证了设计方案的可行性。再次,在方案的可行性得到验证后,完成了小功率的单相光伏并网逆变器控制器的软硬件的设计,确定了以TI公司TMS320F2812为核心控制芯片,完成了信号采样电路、过零检测电路以及MOSFET驱动电路等外围硬件电路的设计以及软件程序的编写。最后,通过搭建实物测试平台,对光伏并网逆变器进行了实验调试。对其关键环节的输出波形通过示波器进行了观测分析,结果表明该光伏并网逆变器实现了设计功能,达到了预定目标。
[Abstract]:The rapid development of the global economy at the same time, with huge energy consumption. With conventional fossil energy depletion, the energy crisis could erupt at any time, speeding up the development and utilization of new energy has been imminent. In many of the new energy, solar energy is great potential of development. At present, the photovoltaic power generation has become the world's main use solar energy and photovoltaic power generation. Because of its many advantages has become the main research direction of photovoltaic power generation. The single phase two stage during the whole working process of non isolated grid connected photovoltaic inverter is analyzed, the key technologies of the need for a more in-depth research, has completed the hardware circuit design and the software program of photovoltaic grid connected inverter and experimental debugging prepared. Firstly, the DC-DC converter was analyzed in theory, pointed out The conventional Boost converter caused by using hard switching technology to abandon the shortcomings of using the conventional Boost converter scheme, with soft switching Boost-ZVT converter applied to photovoltaic inverter system, elaborates its working principle, and the key parameters of the calculation and selection of inverter. The output filter circuit used for comparative analysis to determine the structure of the filter circuit, and the parameter selection of calculation and selection. Secondly, in the photovoltaic cell in-depth theoretical analysis, establish the simulation model in Matlab/ SimuLink environment, the photovoltaic cell by external factors (light intensity and temperature) output characteristic curve of jamming. The PV inverter MPPT, the key technology of grid connected control and islanding detection for a more in-depth research, to determine the The control strategy proposed. And on this basis, build a simulation model of the photovoltaic inverter under the environment of Matlab/SimuLink, verified the feasibility of the design. Thirdly, verified the feasibility of the scheme in, completed the hardware and software design of single phase photovoltaic grid connected inverter controller of small power, determined by TI company TMS320F2812 as the core control chip, the signal sampling circuit, write zero detection circuit and MOSFET driving circuit and peripheral hardware circuit design and software program. Finally, through building a test platform, the PV inverter output waveform. The experiment is done on the key link of the observation and analysis of the results through the oscilloscope. Show that the grid connected photovoltaic inverter to achieve the design function, to achieve the target.

【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM615;TM464

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