本文關(guān)鍵詞： 分布式電能計量檢測 數(shù)字信號源 GPS同步采樣 Cortex-M4 FPGA　出處：《南昌航空大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：在社會快速發(fā)展的今天,電能在經(jīng)濟(jì)建設(shè)、人民生活等各領(lǐng)域扮演著愈來愈重要的地位。電能的計量檢測技術(shù)直接關(guān)系到多方的經(jīng)濟(jì)利益,其地位重要性不言而喻,因此電能計量檢測系統(tǒng)需要定期進(jìn)行檢測。隨著智能電網(wǎng)的發(fā)展,數(shù)字化變電站是當(dāng)今電力系統(tǒng)趨勢。其中電壓合并單元、電流合并單元和數(shù)字電能表等系統(tǒng)呈分布式的結(jié)構(gòu),傳統(tǒng)的傳統(tǒng)的計量方式已無法勝任分布式電能的計量檢測工作,因此開展分布式電能計量檢測系統(tǒng)具有重大意義。本課題開發(fā)設(shè)計了一套基于GPS同步分布式電能計量檢測系統(tǒng)的數(shù)字信號源,該數(shù)字信號源包括信號采集模塊和信號發(fā)送模塊兩個模塊,信號發(fā)送模塊又細(xì)分為IEC61850-9-2協(xié)議數(shù)據(jù)幀的發(fā)送子模塊和FT3數(shù)據(jù)幀的發(fā)送子模塊兩個部分。信號采集模塊選用一個高精度的16位ADS8568芯片進(jìn)行采樣,通過FFT算法計算得到幅值、頻率和相位等數(shù)據(jù)提供給信號發(fā)送模塊,為保證電壓、電流采樣信號的同步采用GPS同步采樣技術(shù),利用GPS的秒脈沖對采樣進(jìn)行GPS同步。采用磁耦隔離技術(shù)將高頻率的數(shù)字地和模擬地隔離開,有效地避免了數(shù)字信號與模擬信號間的干擾帶來的誤差,提高了采樣精度。IEC61850-9-2協(xié)議數(shù)據(jù)幀的發(fā)送以Cortex-M4為核心處理器,將A/D芯片所采集的數(shù)據(jù)經(jīng)過FFT計算后發(fā)送到信號發(fā)送模塊,按照IEC61850-9-2協(xié)議打包,通過網(wǎng)絡(luò)發(fā)送,經(jīng)過光電轉(zhuǎn)換裝置傳輸?shù)綌?shù)字電能表,可用于數(shù)字電能表的檢測。FT3數(shù)據(jù)幀是符合IEC60044-8協(xié)議的數(shù)據(jù)幀,以Cortex-M4和FPGA作為核心處理器,Cortex-M4微處理器將A/D芯片采集的信號按照IEC60044-8協(xié)議的FT3數(shù)據(jù)幀格式打包,發(fā)送到FPGA中做曼徹斯特編碼后將數(shù)據(jù)幀以曼徹斯特碼的形式通過光纖發(fā)射器發(fā)送,可用作模擬的電子式互感器的輸出作為合并單元的輸入,對分布式電能計量檢測系統(tǒng)進(jìn)行檢測。本文首先對課題研究的背景意義和本次對設(shè)計的數(shù)字信號源的主要任務(wù)進(jìn)行了說明。其次對數(shù)字信號源所采用的采樣方法、信號處理方法、相關(guān)協(xié)議及算法進(jìn)行了闡述。然后對本次設(shè)計的數(shù)字信號源的硬件部分的設(shè)計結(jié)合電路原理圖,軟件部分結(jié)合流程圖的設(shè)計展開說明。接著針對測試結(jié)果對其進(jìn)行分析并對出現(xiàn)的誤差的產(chǎn)生原因和消除辦法展開說明。最后對本次設(shè)計的數(shù)字信號源進(jìn)行總結(jié)并指出幾點本次設(shè)計中的不足之處和改進(jìn)辦法。
[Abstract]:With the rapid development of society, electric energy plays a more and more important role in many fields, such as economic construction, people's life, etc. The measurement and detection technology of electric energy is directly related to the economic interests of many parties. With the development of smart grid, digital substation is the trend of power system. The current combining unit and the digital watt-hour meter have distributed structure. The traditional metering method can not be used to measure and detect the distributed electric energy. Therefore, it is of great significance to develop a distributed power measurement and detection system. This paper develops and designs a digital signal source based on GPS synchronous distributed power measurement and detection system. The digital signal source includes two modules: signal acquisition module and signal transmitting module. The signal transmission module is subdivided into two parts: the IEC61850-9-2 protocol data frame sending sub-module and the FT3 data frame transmitting sub-module. The signal acquisition module selects a high precision 16-bit AD. S8568 chip is sampled. The data of amplitude, frequency and phase are obtained by FFT algorithm. In order to guarantee the voltage, the synchronous sampling technology of GPS is used to synchronize the current sampling signal. The sampling is synchronized with the second pulse of GPS, and the high frequency digital and analog isolation is separated by magnetic coupling isolation technology, which effectively avoids the error caused by the interference between digital signal and analog signal. Improve the sampling accuracy. IEC61850-9-2 protocol data frame transmission using Cortex-M4 as the core processor. The data collected by the Ar / D chip is sent to the signal sending module after the FFT calculation. It is packaged according to the IEC61850-9-2 protocol and sent through the network. The data frame of FT3, which can be used to detect the digital watt-hour meter, is the data frame in accordance with the IEC60044-8 protocol, which is transmitted to the digital watt-hour meter by the photoelectric conversion device. Use Cortex-M4 and FPGA as core processors. The Cortex-M4 microprocessor packages the signals collected by the Ar / D chip according to the FT3 data frame format of the IEC60044-8 protocol. The data frame is transmitted in the form of Manchester code to the FPGA by the fiber optic transmitter and can be used as the output of the analog electronic transformer as the input of the merging unit. In this paper, the background significance of the research and the main tasks of the designed digital signal source are explained. Secondly, the sampling method of the digital signal source is introduced. . Signal processing methods, related protocols and algorithms are described. Then the design of the hardware part of the digital signal source is combined with the circuit schematic diagram. The software part combines the design of flow chart to explain. Then it analyzes the test result and explains the cause of the error and the elimination method. Finally, the design of digital signal source is summarized. And points out several points in the design of the deficiencies and improvements.
【學(xué)位授予單位】：南昌航空大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM933.4

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