【作者】 谭平；

【导师】 庄海；

【作者基本信息】 大连理工大学 ， 电机与电器， 2008， 硕士

【摘要】 随着电力系统的迅速发展和电力电子技术的广泛应用,电能污染日益严重,电能质量问题已经成为电力部门及电力用户越来越关注的问题。电能质量的各项指标若偏离正常水平过大,会给发电、输变电和用电设备带来不同程度的危害。电能质量的好坏直接关系到国民经济的总体效益,因此对电能质量进行检测和分析从而提高和改善电能质量具有非常重要的意义。本文首先介绍了电能质量的基本概念,对各种电能质量问题的分类、特征及产生原因和危害作了详细的阐述。通过对电能质量各项指标(供电电压偏差、频率偏差、公用电网谐波、三相电压不平衡度、电压波动与闪变)的分析,以传统的傅立叶变换理论为基础,针对目前电能质量分析的难点即对突变的、暂态的、非平稳的信号的检测与分类,提出了基于小波变换的暂态电能质量分析方法。利用小波变换模极大值原理检测信号奇异点作为是否发生暂态扰动的判据,克服了传统方法中无时域局部性的缺点。在系统的研究了电能质量分析的相关理论和检测技术的基础上,针对电能质量分析系统中需要支持复杂算法和保持实时性的特殊要求,研制了基于DSP与ARM构架的嵌入式电能质量分析系统的硬件平台和软件系统。重点分析了DSP与ARM的选型依据、结构特点、具体应用等。并且详细的介绍了硬件平台的各部分组成和电路原理图。随后,提出了该装置软件部分设计思想,其中重点介绍了DSP部分的FFT算法设计、ARM部分的μC/OS-Ⅱ操作系统移植和MiniGUI图形界面开发。最后对论文的主要工作进行了总结,对以后可深入研究的方向进行了展望。更多还原

【Abstract】 Along with the widely application of modern power electronic technology, power pollution becomes serious increasingly, more and more attentions of power departments and consumers are turned to the power quality. There is great practical significance to improve the power quality by monitoring and analyzing.This paper first introduced the concept of the basic power quality, power quality problems of the various classifications, characteristics and causes harm and a detailed exposition. Through the power quality indicators (three-phase voltage imbalance, voltage fluctuations and flicker, supply voltage deviation, the public power grid harmonics, frequency deviation) analysis to the traditional Fourier transform based on the theory of light Power quality analysis of the difficulties that the mutation, the transient, non-stationary signals in the detection and classification, based on the wavelet transform to the transient power quality analysis. Wavelet transform modulus maximum signal detection theory as a singular point whether there has been a transient disturbance of the criteria, to overcome the traditional method of non-time-domain localized shortcomings.After a system study of power quality analysis theory and the basis of detector technology, power quality analysis system for the need to support the complex algorithms and real-time to maintain the special requirements of developing a framework based on the DSP and ARM Embedded Power Quality Analysis System Hardware platforms and software systems. Focus of the DSP and ARM selection based on structural features and specific applications. And detailed introduction of a hardware platform of the components and circuit schematics. Subsequently, the proposed part of the device software design, which focuses on the DSP part of the FFT algorithm design, the operating systemμC/OS-Ⅱmigration of ARM part and development MiniGUI graphical interface. Finally, conclude the paper’s main work , and the direction of the future.更多还原