【作者】 洪洁；

【导师】 张杰；

【作者基本信息】 湖北工业大学 ， 电气工程， 2011， 硕士

【摘要】 随着全球性的能源危机和环境污染的日益严重,可再生能源的开发与利用越来越受人类的重视。太阳能作为当今世界上取之不尽、用之不竭、廉价无污染、能大规模开发利用的可再生能源之一,其并网发电已受到世界各国的普遍关注。其中光伏并网发电是太阳能光伏利用的主要发展趋势,必将得到快速的发展。此外,随着高性能的数字信号处理芯片(DSP)的出现,使得一些复杂、先进的控制策略在光伏并网逆变器中的应用成为可能。本论文就是在此背景下,对新型的光伏微网逆变器(具备微网特性的光伏逆变器)进行了较为深入的研究,以三相10kW微网逆变器为研究对象,将最大限度的利用太阳能、为负载提供稳定、可靠的电能供应作为主要目标,采用TI公司生产的高性能的32位DSP(TMS320F28335)为控制芯片,开展光伏微网发电系统的理论和试验研究,具有重要的现实意义。论文的主要工作如下:首先,概述了本课题研究的背景及意义以及国内外光伏产业的研究现状。其次,分析了光伏微网发电系统的系统结构,阐述了光伏微网发电系统的主要特点,并对系统的主要构成部分作了详细的介绍。然后,针对光伏微网逆变器离网、并网两种运行方式所采用的控制策略作了详细的分析,对其中的PI控制器、SPWM波的生成、数字锁相环技术等关键环节的软件控制作了详细的分析,并给出了各个环节所对应的详细程序流程图。最后,通过仿真并进行实验调试,给出了部分仿真和实验结果波形及分析。综上所述,本文主要分析了光伏微网逆变器的离网、并网运行方式的控制策略。通过几种控制策略的比较,在离网工作模式下采用电压闭环控制策略,并网工作模式下采用改进型的三角波电流比较方式的控制策略,并进行了控制策略的仿真研究。通过相关仿真和实验,验证了控制策略所具有的良好的动态和稳态性能。更多还原

【Abstract】 With a global energy crisis and the increasingly serious environmental pollution, energy development and utilization of renewable are becoming more and more attention of the human. Solar energy as one of the renewable energy is an inexhaustible, cheap and non-pollution, and could large-scale exploitation in the world, photovoltaic grid-connected power generating has been world attention. And solar photovoltaic grid-connected power generating is the main development tendency in utilization, and it will get fast development. In addition, with the appearing of the high-performance digital signal processing chip (DSP), makes some complex, advanced control strategy in the application of photovoltaic grid-connected inverter become possible.This thesis, in this context, have a more depth study to the new photovoltaic micro-grid inverter (have micro-grid characteristics of photovoltaic inverter), taking three phase 10kW micro-grid inverter as research object, taking the best utilization of solar energy and providing for load stable and reliable power supply as the main goal, using TI company production of high-performance 32-bit DSP (TMS320F28335) as control chip, conducting photovoltaic micro-grid power generating system’theory and experiment research, have important practical significance. This paper’major works are as follows:Firstly, summarizes the background and significance of the research and the research status of photovoltaic industry at domestic and overseas.Secondly, analyzes the system structure of photovoltaic micro-grid power generating systems, expounds the main features of photovoltaic micro-grid power generating systems, and analyzes, in detail, the main component part of the system.Then, aimed at photovoltaic micro-grid inverter gird-disconnected and grid- connected two operation mode adopted by the control strategy has made the detailed analysis, presents the PI controller, SPWM wave generating, phase-lock-loop technique such key links control software has made the detailed analysis, and gives each link of the corresponding detailed program flowchart.Finally, with simulation and experiment debugging, gives part of the simulation and experiment results waveform and analysis.In conclusion, this paper mainly analyzes photovoltaic micro-grid inverter grid-disconnected, grid-connected two operation mode control strategy. Through the comparison of several control strategy, grid-disconnected operation mode adopts voltage closed-loop control strategy, grid-connected operation mode adopts modified triangle wave comparative current control strategy, and makes the simulation of the control strategy. Through the related simulation and experimental results demonstrate that the control strategy has good dynamic and stable performance.更多还原