本文關(guān)鍵詞：智能電網(wǎng)光測控中IEEE1588透傳時鐘的研究與實(shí)現(xiàn)　出處：《湖北工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 智能電網(wǎng) 光測控 同步 IEEE1588 透傳時鐘

【摘要】：傳統(tǒng)變電站中測控設(shè)備和一次設(shè)備是通過普通電纜線相連、基于模擬信號通信的,每測量一種信號就需要增加一條連線。為了增加信號傳遞的準(zhǔn)確性,并減小連線的復(fù)雜度,智能電網(wǎng)從傳感到通信過程全面采用全光數(shù)字化信號,光測控過程中測控設(shè)備和一次設(shè)備通過網(wǎng)絡(luò)連接。然而網(wǎng)絡(luò)連接方式會帶來同步問題。智能電網(wǎng)中目前存在的同步技術(shù)有GPS、IRIG-B和串口同步方式,但是它們是基于專用數(shù)據(jù)線通信的,不能滿足網(wǎng)絡(luò)化和IP化的需求。IEEE1588是基于分組傳送的,能夠很好的滿足網(wǎng)絡(luò)化的需求,而且其同步精度能夠達(dá)到亞微妙級。在網(wǎng)絡(luò)設(shè)備中實(shí)現(xiàn)IEEE1588透傳時鐘,能夠在連接測控設(shè)備和一次設(shè)備時對網(wǎng)絡(luò)設(shè)備的延時進(jìn)行補(bǔ)償,從而提高測控設(shè)備和一次設(shè)備的同步精度,符合智能電網(wǎng)光測控的需求。本文介紹了與IEEE1588透傳時鐘相關(guān)的理論知識,包括IEEE1588的基本概念、節(jié)點(diǎn)的分類、透傳時鐘的分類、利用P2P方式和E2E方式實(shí)現(xiàn)透傳時鐘的同步原理�；谕競鲿r鐘的原理,本文對影響透傳時鐘精度的主要因素進(jìn)行了分析,得出晶振精度是影響透傳時鐘精度的主要因素,并進(jìn)一步分析得出在晶振精度確定的情況下可以通過縮短駐留延時和傳輸延時提高透傳時鐘的精度。本文在網(wǎng)絡(luò)設(shè)備中實(shí)現(xiàn)了IEEE1588透傳時鐘的硬件和軟件系統(tǒng)設(shè)計,通過在硬件層對時間同步報文打時間戳,并結(jié)合FPGA和CPU對同步報文進(jìn)行處理,可以將單個透傳時鐘設(shè)備的精度維持在10ns量級。硬件部分CPU選擇PowerPC83系列;MAC選擇能夠在MAC與PHY接口處對出入MAC的IEEE1588報文打時標(biāo)的芯片;晶振選用TX⑶中的高端型,精度為4.6ppm;FPGA選擇賽靈思中高端產(chǎn)品。在硬件的基礎(chǔ)上實(shí)現(xiàn)了軟件系統(tǒng)的設(shè)計,CPU上運(yùn)行的多任務(wù)實(shí)時操作系統(tǒng)為嵌入式Linux,所做的軟件工作是基于已有的PTN軟件平臺基礎(chǔ)之上完成的。分析了利用的軟件平臺對IEEE1588的支持和PTP報文的處理流程。軟件的功能主要包括報文收發(fā)模塊、時間戳信息的提取以及IEEE1588透傳時鐘協(xié)議的處理。最后對透傳時鐘的主要性能進(jìn)行了測試,主要包括功能性測試、性能測試和負(fù)面測試三個方面。實(shí)驗結(jié)果得出透傳時鐘的精度在80ns左右,并且具有一定的容錯功能,能夠滿足應(yīng)用需求。
[Abstract]:Traditional substation measurement and control equipment and primary equipment is connected by ordinary cable, based on analog signal communication, each signal measurement needs to add a line. In order to increase the accuracy of signal transmission. And reduce the complexity of the connection, smart grid from the communication process of all-optical digital signal. In the process of optical measurement and control, the measurement and control equipment and the primary equipment are connected through the network. However, the network connection mode will bring about the synchronization problem. The current synchronization technology in the smart grid is GPS. IRIG-B and serial port synchronization mode, but they are based on dedicated data line communication, can not meet the network and IP requirements. IEEE1588 is based on packet transmission. It can meet the needs of the network well, and its synchronization accuracy can reach subdelicate level. In the network equipment, the IEEE1588 transmission clock can be realized. It can compensate the delay of the network equipment when connecting the measuring and controlling equipment and the primary equipment, thus improving the synchronization accuracy of the measuring and controlling equipment and the primary equipment. This paper introduces the theoretical knowledge related to IEEE1588 transparent clock, including the basic concept of IEEE1588, the classification of nodes, and the classification of transparent clock. Using P2P and E2E to realize the synchronization principle of transparent clock. Based on the principle of transparent clock, this paper analyzes the main factors that affect the accuracy of transparent clock. It is concluded that the precision of crystal oscillator is the main factor that affects the accuracy of transmission clock. Furthermore, it is concluded that the precision of the transparent clock can be improved by shortening the dwell delay and transmission delay when the crystal oscillator precision is determined. In this paper, the hardware of the IEEE1588 transparent clock is realized in the network equipment. And software system design. By timestamp on the hardware layer, and combined with FPGA and CPU to process the synchronous message. The accuracy of a single transparent clock device can be maintained at 10ns. The hardware part CPU selects the PowerPC83 series; The MAC selects the chip that can mark the IEEE1588 message in and out of MAC at the interface between MAC and PHY. The crystal oscillator uses the high-end type of TX3 with an accuracy of 4.6 ppm; Based on the hardware, the design of the software system is realized. The multi-task real-time operating system running on the FPGA is embedded Linux. The software work done is based on the existing PTN software platform. This paper analyzes the support of the software platform to IEEE1588 and the processing flow of PTP message. The main function package of the software is analyzed. Includes message receiving and sending module. The extraction of timestamp information and the processing of IEEE1588 transparent clock protocol. Finally, the main performance of the transparent clock is tested, including the functional test. The experimental results show that the accuracy of the transparent clock is about 80 ns, and it has some fault-tolerant function, which can meet the application requirements.
【學(xué)位授予單位】：湖北工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM76

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