电能质量监测系统的设计与研究硕士学位.doc
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1、【精品文档】如有侵权,请联系网站删除,仅供学习与交流电能质量监测系统的设计与研究硕士学位.精品文档.硕士学位论文电能质量监测系统的设计与研究DESIGN AND RESEARCH OF THEELECTRIC POWER QUALITYMONITORING SYSTEM李林哈尔滨工业大学2009 年 6 月国内图书分类号:TM932国际图书分类号:621.3学校代码:10213密级:公开工学硕士学位论文电能质量监测系统的设计与研究硕 士 研究生:李林导师:曲延滨教授申 请 学 位 : 工学硕士学 科 专 业 : 电气工程所 在 单 位:信息科学与工程学院答 辩 日 期:2009 年 6 月授予
2、学位单位:哈尔滨工业大学Classified Index: TM932U.D.C: 621.3Dissertation for the Master Degree in EngineeringDESIGN AND RESEARCH OF THEELECTRIC POWER QUALITYMONITORING SYSTEMCandidate:Supervisor:Academic Degree Applied for:Specialty:Affiliation:Date of Defense:Degree-Conferring-Institution:Li LinProf. Qu YanbinM
3、aster of EngineeringElectrical EngineeringSchool of Information Science andEngineeringJune, 2009Harbin Institute of Technology哈尔滨工业大学工学硕士学位论文摘要随着国民经济和科学技术的迅速发展,现代电力电子变流装置和非线性设备被大量使用,电能质量问题已经引起电力部门和许多重要商业用户的密切关注,一方面是电网电能质量的下降,另一方面却是用户对电能质量要求的提高,其矛盾日益尖锐。因此,如何提高和保证电能质量己经成为我国电力系统面临的重要问题,对电能质量进行监测与分析具有十分
4、重要的意义。本文首先论述了电力系统参数监测的意义及研究发展现状,介绍了谐波的危害和目前存在的谐波检测方法,并在电能质量和电能计量相关的国家标准的基础上,提出了电力参数监测系统的设计方案,然后从硬件、软件和算法三个方面详细介绍了电力参数监测系统的研制。根据监测系统的需要,本文采用 DSP+MCU 构架,充分发挥 DSP 芯片的数字处理能力和 MCU 的控制功能。采用模块化的设计思路,将系统分为信号采集模块、信号处理模块、人机接口模块等多个功能模块,各模块之间通过信息交换协调工作。硬件方面,本文详细介绍了数据采集和数据处理等模块的具体电路实现,以及相关的系统电路扩展;软件方面,本文着重分析了谐波分
5、析算法,采用了一种针对实输入序列的高效 FFT 算法,并对使用 FFT 算法带来的频谱泄漏和栅栏效应进行了详细分析,提出了基于窗函数的插值 FFT 算法,给出了算法的 DSP 实现方法,并在 MATLAB 中进行仿真,验证了算法的正确性。同时,对于频谱分析的抗混叠处理,本文设计了基于窗函数的数字滤波器。对于 DSP 自举引导程序的设计、DSP 与 A/D 以及 MCU 的接口编程以及数据的采集,本文也详细的介绍了其实现过程。本系统具有很高的测量速度和测量精度,人机界面友好,易于操作,功能齐全,具有可扩展性,便于系统的硬件和软件升级,具有很好的研究价值和实用价值。关键词电能质量监测;谐波分析;数
6、字滤波器;FFT;DSPI哈尔滨工业大学工学硕士学位论文Abstract With the rapid development of national economy and science technology,various kinds of electric and electronic convertors and other non-linear load arewidely applicated, this can make the voltage and current waveform distor and resultin the serious depravation of
7、 electric power quality. So the electric powerdepartments and many important business users now pay more and more attention tothe electric power quality issue. On the one hand, the quality of electric power hasdeclined, on the other hand the users require to improve the quality of electricalenergy.
8、So detecting and analyzing electric power quality is quite significant. In accordance with the need of the monitoring system, we use DSP+MCUarchitecture, and give full play to the digital processing capacity of DSP and thecontrol function of MCU. The thesis firstly discusses the significance of powe
9、rquality monitoring system and the development of the meaning of the power qualitymonitoring system, then introduce the harm of harmonic in power system and severalkinds of general analysis methods used in harmonic monitoring. And, the thesisdesigns the system scheme bases on the national and sector
10、 standards about electricpower quality. Then the author introduce the research method of electric powerquality monitoring system from the two aspects of hardware and software. The author uses the modular design method to design the multifunctionalelectric power quality monitoring system, the system
11、is divided to several modulessuch as signal acquisition module, signal processing module, man-machine interfaceand so on. The modules work in harmony through the exchange of informationbetween them. The author designs the hardware part design method of circuitschematic diagram including the signal a
12、cquisition module and the signal processingmodule, and related expansion of the system circuit. The author designed thehardware part focusing on the harmonic analysis algorithm, using a high-efficiencyFFT algorithm for a real number input sequence. The author also analyses detailedlythe spectrum lea
13、kage and fence effect accompanied by using FFT algorithm, bringingforward the interpolated FFT algorithm based on window function, and introduceshow to actualize it in DSP. Then we give the simulation method in MATLAB toverify the correctness of the algorithm. Simultaneously, the thesis designs the
14、digitalfilter based on window function to deal with spectrum aliasing. In addition, the thesisII哈尔滨工业大学工学硕士学位论文introduces the design method of bootloader function and the interface with otherequipment for DSP. The system has very high measurement speed and the measuring accuracy,friendly interface,
15、easy to operate, multi-function, convenient extension,easy toupgrade the hardware and software. So it has a high value for researching andpractical application.Key words electric power quality monitoring system, harmonic analysis, digital filters, FFT, DSPIII哈尔滨工业大学工学硕士学位论文目录摘 要 .IAbstract . II第 1 章
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