光伏并网系统逆变器的SVPWM优化及反孤岛研究-机械电子工程专业论文.docxVIP

万方数据 万方数据 摘要 摘 要 光伏并网技术是一种充分利用太阳能很有用的技术，太阳能是绿色、清洁的 能源。光伏并网技术也因此而成为研究的热点。本文主要分析并网光伏逆变器的 调制策略和反孤岛效应检测技术，在电力电子变换器中，对逆变器的调制控制策 略很多，特点各异，但是在以太阳能电池为能源提供者的光伏应用中，并网逆变 器的效率是并网逆变器一个十分关键的指标，选用功耗相对较小的控制策略和调 制方式，是提高效率的有效途径。因此本文从研究提高效率的方式来探索 SVPWM 的优化。本文将从 SVPWM 的基本原理入手，研究论述 SVPWM 在 DSP 上的实 现和优化途径，并在 Matlab/simulink 下仿真。反孤岛效应技术是并网光伏逆变器 一个基本功能，也是很重要的安全保障。本文介绍了孤岛发生的原因和光伏并网 系统孤岛的负面影响，简要分析了被动和主动式孤岛检测方法，为减少无检测区 （NDZ），一个新的频率漂移电压漂移检测技术被提出，并在 Matlab/Simulink 建 立了系统的仿真模型。最后，介绍了 DSP TMS320LF2407 与 Matlab/Simulink 仿 真。 关键词：光伏、并网、空间矢量脉宽调制、孤岛检测 I ABSTRACT ABSTRACT Grid-Connected photovoltaic technology is a perfect way to make full use of solar energy, which is green and clear energy. The grid-connected photovoltaic system has been a hot spot. First of all, a survey in made on the state-of-the-art developments and application of the PV power system, then the types and structure of the PV system was introduced. Inverter is the key interface between the PV array and power grid, which influences a lot on the general performance. Secondly, in order to reduce switching losses, an optimal strategy of SVPWM is discussed in this paper, this paper analysis the principle of SVPWM and based on simulation of Matlab/simlink. And then, the occurrence cause and negative effects of the islanding in grid-connected PV system are introduced in the paper, a brief analysis of the traditional passive and active islanding detection method, in order to reduce none-detection zone (NDZ), a new frequency drift with voltage drift technique was proposed. The simulation model of system was established in Matlab/simulink. Finally, the TMS320LF2407 and simulation of Matlab/simulink was introduced. Keywords：Photovoltaic, Grid-Connected, SVPWM, Islanding detect II 目录 目 录 HYPERLINK \l _bookmark0 第一章 绪论 .................................................................................................................... 1 HYPERLINK \l _bookmark1 1.1 光伏发电的背景和意义 ....................................................................