發(fā)布時(shí)間：2018-06-25 09:34

  本文選題：測控終端 + 國產(chǎn)芯片　； 參考：《西安電子科技大學(xué)》2015年碩士論文

【摘要】：電力系統(tǒng)自動(dòng)化是電力系統(tǒng)一直以來不斷努力發(fā)展的方向。電力系統(tǒng)自動(dòng)化包括發(fā)電控制自動(dòng)化、電力調(diào)度自動(dòng)化以及配電網(wǎng)自動(dòng)化。其中,電力系統(tǒng)的配電環(huán)節(jié)是面向電力用戶的一個(gè)重要環(huán)節(jié),配電設(shè)備性能的高低、質(zhì)量的好壞決定了電力系統(tǒng)是否可以安全、平穩(wěn)運(yùn)行。論文以一種配電自動(dòng)化遠(yuǎn)方終端的開發(fā)為背景,對(duì)遠(yuǎn)方終端的關(guān)鍵技術(shù)進(jìn)行研究,在基于自主可控的國產(chǎn)芯片的基礎(chǔ)上,完成了具有數(shù)據(jù)加密傳輸功能的高性能安全測控終端的設(shè)計(jì)。論文首先介紹了安全測控終端的基本功能、應(yīng)用環(huán)境以及相關(guān)的國家電力行業(yè)標(biāo)準(zhǔn)。給出了安全測控終端的整體設(shè)計(jì)方案,重點(diǎn)介紹了安全測控終端的核心處理器-龍芯1B處理器以及終端配置。選擇了一款高精度的16位ADC,并設(shè)計(jì)了合適的交流采樣電路,以提高采樣精度,減小電力參數(shù)的誤差。其次,論文介紹了電力系統(tǒng)中直流采樣和交流采樣兩種電量采樣方法,分析兩種采樣方法的優(yōu)缺點(diǎn),確定交流采樣作為本論文終端設(shè)計(jì)的采樣方法。介紹了交流采樣常用的采樣算法,包括正弦模型算法,非正弦周期模型算法。其中正弦模型算法主要有最大值算法、單點(diǎn)算法、半周期積分法、兩點(diǎn)采樣等;非正弦模型算法有均方根算法、付里葉算法等。并介紹如何配置采集芯片及芯片采集流程設(shè)計(jì)了信號(hào)調(diào)理電路、開關(guān)量輸入輸出電路,通過MATLAB、Multisim軟件進(jìn)行仿真驗(yàn)證。再其次,論文介紹了安全測控終端的通信接口,首先介紹了電力系統(tǒng)常用的一些通信協(xié)議,包括CAN、DNP3.0、Modbus協(xié)議、IEC 60870-5系列協(xié)議(101規(guī)約和103規(guī)約)。其中兩種規(guī)約分別對(duì)應(yīng)兩種通信接口。一種是采用RS485接口的通信方式,同時(shí)介紹了串口通信方式下Modbus通信協(xié)議,分析Modbus通信協(xié)議數(shù)據(jù)幀格式,并舉例說明Modbus通信協(xié)議在安全測控終端上的功能。另一種是采用以太網(wǎng)接口的通信方式,并介紹了Modbus/TCP協(xié)議。分析出利用以太網(wǎng)通信接口,可以實(shí)現(xiàn)數(shù)據(jù)更快速,更穩(wěn)定,更長距離的傳輸。論文最后部分介紹了安全測控終端的密碼子系統(tǒng),即采用國密算法對(duì)數(shù)據(jù)傳輸進(jìn)行加密,分析了數(shù)據(jù)加密傳輸?shù)淖饔煤鸵饬x。介紹了論文采用的國密算法:SM1、SM2、SM3、SM4算法。以及各個(gè)算法的基本原理和作用。仿真測試表明:安全測控終端電力參數(shù)采集計(jì)算部分準(zhǔn)確度高,誤差大小控制在《DL/T 721-2013配電自動(dòng)化遠(yuǎn)方終端》標(biāo)準(zhǔn)要求的范圍內(nèi),實(shí)時(shí)性較好,通過抓包測試時(shí),數(shù)據(jù)在VPN隧道里以密文形式傳輸。滿足了設(shè)計(jì)要求。
[Abstract]:Power system automation is the direction of power system development. Power system automation includes generation control automation, power dispatching automation and distribution network automation. The distribution of power system is an important link for power users. The performance and quality of distribution equipment determine whether the power system can operate safely and smoothly. Based on the development of a kind of distribution automation remote terminal, the key technology of remote terminal is studied in this paper. The design of high performance security measurement and control terminal with the function of data encryption and transmission is completed. Firstly, the paper introduces the basic function, application environment and relevant national power industry standards of the security measurement and control terminal. The overall design scheme of the security control terminal is given. The core processor of the security measurement and control terminal, the Godson 1B processor, and the configuration of the terminal are emphatically introduced. A high precision 16-bit ADC is selected and a suitable AC sampling circuit is designed to improve the sampling accuracy and reduce the error of power parameters. Secondly, the paper introduces the DC sampling and AC sampling in the power system, analyzes the advantages and disadvantages of the two sampling methods, and determines the AC sampling as the sampling method for the terminal design of this paper. This paper introduces the sampling algorithms used in AC sampling, including sinusoidal model algorithm and non-sinusoidal periodic model algorithm. Among them, the sinusoidal model algorithm mainly has maximum algorithm, single-point algorithm, semi-periodic integration method, two-point sampling and so on; the non-sinusoidal model algorithm has root mean square algorithm, Fourier algorithm and so on. It also introduces how to configure the acquisition chip and how to design the signal conditioning circuit, the switch input and output circuit, and the simulation verification by MATLAB Multisim software. Secondly, the paper introduces the communication interface of the security measurement and control terminal. Firstly, it introduces some communication protocols commonly used in power system, including CANU DNP3.0 Modbus protocol and IEC 60870-5 series protocol (101 protocol and 103 protocol). The two protocols correspond to two communication interfaces. One is the communication mode using RS485 interface. At the same time, the Modbus communication protocol under the serial communication mode is introduced. The data frame format of the Modbus communication protocol is analyzed, and the function of the Modbus communication protocol in the security measurement and control terminal is illustrated by an example. The other is the communication mode using Ethernet interface, and the Modbus / TCP protocol is introduced. The Ethernet communication interface can be used to realize faster, more stable and longer distance data transmission. The last part of the paper introduces the cryptographic subsystem of the security measurement and control terminal, that is, encrypting the data transmission by using the country secret algorithm, and analyzing the function and significance of the data encryption transmission. In this paper, the national secret algorithm: SM1 / SM2 / SM3 / SM4 is introduced. And the basic principle and function of each algorithm. The simulation test shows that the power parameter collection and calculation part of the security measurement and control terminal has high accuracy, and the error is controlled within the range of < DL / T721-2013 power distribution automation remote terminal > standard, and the real-time performance is better. Data is transmitted in the VPN tunnel in ciphertext. Meet the design requirements.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TM76

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