【正文】 al economy and science technology, various kinds of electric and electronic convertors and other nonlinear load are widely applicated, this can make the voltage and current waveform distor and result in the serious depravation of electric power quality. So the electric power departments and many important business users now pay more and more attention to the electric power quality issue. On the one hand, the quality of electric power has declined, on the other hand the users require to improve the quality of electrical energy. So detecting and analyzing electric power quality is quite significant. In accordance with the need of the monitoring system, we use DSP+MCU architecture, and give full play to the digital processing capacity of DSP and the control function of MCU. The thesis firstly discusses the significance of power quality monitoring system and the development of the meaning of the power quality monitoring system, then introduce the harm of harmonic in power system and several kinds of general analysis methods used in harmonic monitoring. And, the thesis designs the system scheme bases on the national and sector standards about electric power quality. Then the author introduce the research method of electric power quality monitoring system from the two aspects of hardware and software. The author uses the modular design method to design the multifunctional electric power quality monitoring system, the system is divided to several modules such as signal acquisition module, signal processing module, manmachine interface and so on. The modules work in harmony through the exchange of information between them. The author designs the hardware part design method of circuit schematic diagram including the signal acquisition module and the signal processing module, and related expansion of the system circuit. The author designed the hardware part focusing on the harmonic analysis algorithm, using a highefficiency FFT algorithm for a real number input sequence. The author also analyses detailedly the spectrum leakage and fence effect acpanied by using FFT algorithm, bringing forward the interpolated FFT algorithm based on window function, and introduces how to actualize it in DSP. Then we give the simulation method in MATLAB to verify the correctness of the algorithm. Simultaneously, the thesis designs the digital filter based on window function to deal with spectrum aliasing. In addition, the thesis II 哈爾濱工業(yè)大學(xué)工學(xué)碩士學(xué)位論文 introduces the design method of bootloader function and the interface with other equipment for DSP. The system has very high measurement speed and the measuring accuracy, friendly interface, easy to operate, multifunction, convenient extension,easy to upgrade the hardware and software. So it has a high value for researching and practical application. Key words electric power quality monitoring system, harmonic analysis, digital filters, FFT, DSP III 哈爾濱工業(yè)大學(xué)工學(xué)碩士學(xué)位論文 目 錄 摘 要 ......................................................................................................................I Abstract ................................................................................................................. II 第 1 章 緒論 ............................................................................................................ 1 本文研究的背景和意義 ............................................................................... 1 電力監(jiān)測裝置的國內(nèi)外研究現(xiàn)狀 ............................................................... 2 論文研究的主要內(nèi)容 ................................................................................... 4 第 2 章 電力參數(shù)的測量原理 ................................................................................. 6 基本電參量的測量原理及方法 ................................................................... 7 三相交流電壓電流有效值的測量 ........................................................ 8 功率的測量 .......................................................................................... 8 電能質(zhì)量指標(biāo)的測量 ................................................................................... 9 電壓偏差的測量 ................................................................................... 9 頻率及頻率偏差的測量 ..................................................................... 10 諧波測量理論綜述 .................................................................................... 10 諧波的定義及其產(chǎn)生原因 ................................................................. 10 現(xiàn)存諧波測量方法的比較 ................................................................. 11 本章小結(jié) .................................................................................................... 12 第 3 章 電力參數(shù)測量算法的分析研究及仿真 .................................................... 14 基于傅里葉變換的諧波分析算法 ............................................................. 14 按時(shí)間抽取 (DIT)的基 2FFT 算法原理 ............................................. 15 按時(shí)間抽取的 FFT 算法的特點(diǎn) ......................................................... 17 實(shí)序列 FFT 的高效算法 .................................................................... 18 諧波分析中 FFT 算法存在的問題及解決辦法 .......................................... 20 基于加窗插值的 FFT 算法的分析與研究 .................................................. 23 常用窗函數(shù)及其特性 ......................................................................... 24 基于窗函數(shù)的插值 FFT 算法原理 ..................................................... 25 基于窗函數(shù)的插值 FFT 算法的 MATLAB 仿真分析 ........................ 28 本章小結(jié) .................................................................................................... 30 第 4 章 電力參數(shù)實(shí)時(shí)測量系統(tǒng)的硬件設(shè)計(jì) ........................................................ 31 系統(tǒng)硬件總體設(shè)計(jì)方案 ............................................................................. 31 多通道數(shù)據(jù)采集模塊的硬件設(shè)計(jì) .............................................