本文選題：三相不平衡度 + 諧波��； 參考：《太原理工大學(xué)》2017年碩士論文

【摘要】：發(fā)電、輸電和配電過程中電氣設(shè)備的使用增加了電力系統(tǒng)中的三相不平衡度、電壓畸變和諧波等干擾。這些干擾均屬于電能質(zhì)量問題,電能質(zhì)量的好壞已經(jīng)成為衡量國和管理水平高低的依據(jù)。借助于DSP強大的數(shù)據(jù)處理能力和ARM豐富的管理能力,本文研制了一套集多參數(shù)計算、顯示與多種無線通訊為一體的電能質(zhì)量監(jiān)測裝置,該方案結(jié)構(gòu)簡單、可移植性強、功耗低、便于后期再開發(fā)。本文主要研究內(nèi)容如下:(1)介紹電能質(zhì)量問題的相關(guān)定義,從而引出電能質(zhì)量監(jiān)測的意義,同時介紹了電能質(zhì)量的標(biāo)準(zhǔn)、指標(biāo)、國內(nèi)外研究動態(tài)等。(2)介紹了三相不平衡的危害、定義、計算式等基本理論;利用對稱分量法計算三相不平衡度;同時用MATLAB搭建電力系統(tǒng)模型,對比接入電弧爐前后三相不平衡程度,為后續(xù)研究三相不平衡度奠定了基礎(chǔ)。(3)介紹了傳統(tǒng)DFT在電力系統(tǒng)中的應(yīng)用,但易引起頻譜泄露和柵欄效應(yīng)問題,引入擴展DFT算法,該算法以傅里葉積分變換為目標(biāo),在擴展的頻率范圍內(nèi)優(yōu)化變換基。介紹了算法的原理、實現(xiàn)過程和在諧波檢測中的應(yīng)用。(4)電能質(zhì)量監(jiān)測裝置的硬件采用的是基于TMS320F2812和LPC1758的雙CPU結(jié)構(gòu),充分利用兩種CPU的優(yōu)點提高裝置的性能。負(fù)責(zé)數(shù)據(jù)采集和處理的DSP子系統(tǒng)主要包括信號采集電路、AD轉(zhuǎn)換電路、DSP數(shù)據(jù)處理電路;負(fù)責(zé)數(shù)據(jù)管理的ARM子系統(tǒng)主要包括時鐘模塊、SIM800無線通信、HT1626液晶驅(qū)動模塊,著重介紹各個模塊的工作原理和硬件電路設(shè)計。(5)根據(jù)硬件結(jié)構(gòu)利用C/C++語言按照模塊化的編程理念完成軟件系統(tǒng)的設(shè)計和開發(fā),詳細(xì)闡述了DSP和ARM子系統(tǒng)的軟件設(shè)計流程、軟件開發(fā)平臺等。包括DSP初始化、AD轉(zhuǎn)換驅(qū)動程序、數(shù)據(jù)分析和計算程序、數(shù)據(jù)發(fā)送程序、時鐘同步程序、GPRS無線方式連接遠(yuǎn)程服務(wù)器程序、HT1626驅(qū)動液晶顯示屏程序等。(6)為確保裝置的穩(wěn)定性,將裝置分模塊調(diào)試,每個模塊獨立完成指定的功能后再整體調(diào)試;標(biāo)準(zhǔn)源線性輸出不同的值,根據(jù)液晶顯示結(jié)果校準(zhǔn)裝置,從而提高監(jiān)測精度;將裝置接入電網(wǎng)中,將監(jiān)測結(jié)果上傳至服務(wù)器,便于實時監(jiān)測低壓側(cè)的電能質(zhì)量狀況。
[Abstract]:The use of electrical equipment in power generation, transmission and distribution processes increases the three-phase imbalance, voltage distortion and harmonics in the power system. These disturbances all belong to the power quality problem, and the quality of power quality has become the basis to measure the country and the level of management. With the help of the powerful data processing ability of DSP and the rich management ability of arm, a set of power quality monitoring device with multi-parameter calculation and display and multiple wireless communication is developed in this paper. The scheme is simple in structure, strong in portability and low in power consumption. Convenient for later development. The main contents of this paper are as follows: (1) introducing the relevant definition of power quality problem, thus leading to the significance of power quality monitoring, and introducing the standard, index, domestic and foreign research trends of power quality, etc.) the harm of three-phase imbalance is introduced. Definition, calculation formula and other basic theories; use symmetrical component method to calculate the three phase unbalance degree; at the same time, build the power system model with MATLAB, compare the three phase unbalance degree before and after the electric arc furnace, This paper introduces the application of traditional DFT in power system, but it is easy to cause spectrum leakage and fence effect problems. The extended DFT algorithm is introduced, which aims at Fourier integral transform. The transform basis is optimized in the extended frequency range. This paper introduces the principle of the algorithm, the realization process and the application in harmonic detection. The hardware of the power quality monitoring device adopts the dual-CPU structure based on TMS320F2812 and LPC1758, and makes full use of the advantages of the two CPUs to improve the performance of the device. The DSP subsystem in charge of data acquisition and processing mainly includes signal acquisition circuit, AD conversion circuit and DSP data processing circuit, and arm subsystem in charge of data management mainly includes clock module, SIM800 wireless communication device, HT1626 liquid crystal driving module. The working principle and hardware circuit design of each module are introduced emphatically.) according to the hardware structure, C / C language is used to complete the design and development of the software system according to the modular programming concept. The software design flow of DSP and arm subsystem is described in detail. Software development platform, etc. It includes DSP initialization of AD converter driver, data analysis and calculation program, data transmission program, clock synchronization program GPRS wireless connection remote server program, HT1626 LCD driver program, etc.) to ensure the stability of the device. The device is debugged into modules, each module completes the specified function independently and then debugs as a whole; the standard source outputs different values linearly and calibrates the device according to the result of liquid crystal display, thereby improving the monitoring accuracy; connecting the device to the power grid, The monitoring results are uploaded to the server for real-time monitoring of the power quality of the low voltage side.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM930

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本文編號：2015475