微機(jī)型高壓電網(wǎng)繼電保護(hù)系統(tǒng)的設(shè)計(jì)

電子機(jī)電論文編號(hào):JD337 本份設(shè)計(jì)附開(kāi)題報(bào)告,任務(wù)書(shū),外文翻譯,原理圖,PCB,字?jǐn)?shù):13572,頁(yè)數(shù):35  oúì 目    錄
摘  要 I
Abstract II
1 緒論 1
1.1智能型高壓電繼電保護(hù)系統(tǒng)基本概念 1
1.2 智能型高壓電繼電保護(hù)系統(tǒng)的基本構(gòu)成 1
1.3高壓電繼電保護(hù)系統(tǒng)發(fā)展及現(xiàn)狀 2
2 系統(tǒng)硬件設(shè)計(jì) 4
2.1 微機(jī)型高壓電繼電保護(hù)系統(tǒng)結(jié)構(gòu)框圖 4
2.2 TMS320LF2407A的優(yōu)勢(shì)及特點(diǎn) 4
2.3 TMS320LF2407A最小系統(tǒng) 5
2.3.1 DSP核心供電及復(fù)位電路 5
2.3.2 晶振電路設(shè)計(jì) 5
2.3.3 電源電路設(shè)計(jì) 7
2.3.4片外存儲(chǔ)器 7
2.4信號(hào)調(diào)理及濾波單元 8
2.4.1信號(hào)調(diào)理單元 8
2.4.2低通濾波器 11
2.5模數(shù)轉(zhuǎn)換電路采樣保持部分設(shè)計(jì) 11
2.5.1 MAX125的特性及工作原理 12
2.5.2電平轉(zhuǎn)換電路設(shè)計(jì) 13
2.6開(kāi)關(guān)量控制電路 14
2.6.1 開(kāi)關(guān)量輸出的應(yīng)用特點(diǎn) 14
2.6.2 輸出控制電路設(shè)計(jì) 14
2.7鍵盤(pán)接口電路 15
2.7.1鍵盤(pán)處理的基本思路 16
2.7.2 鍵盤(pán)電路設(shè)計(jì) 16
2.8液晶顯示模塊電路 18
2.8.1 LCD液晶顯示器使用方法 18
2.8.2 LCM320240的引腳定義 19
2.8.3 液晶電路設(shè)計(jì) 19
2.9 DSP與PC機(jī)通信電路設(shè)計(jì) 21
2.9.1串行通信的基本概念 21
2.9.2遠(yuǎn)距離串行通信設(shè)計(jì) 21
2.10 PCB設(shè)計(jì) 22
結(jié)    論 24
參 考 文 獻(xiàn) 25
附 錄 Protel原理圖 26
致    謝 31

摘  要
隨著現(xiàn)代化生產(chǎn)的機(jī)械化、自動(dòng)化程度的提高，供電容量不斷增大、電網(wǎng)電壓不斷提高，對(duì)電氣設(shè)備保護(hù)的可靠性、技術(shù)的先進(jìn)性要求越來(lái)越高。為了有效保證人身及設(shè)備安全開(kāi)發(fā)研制智能型高壓電監(jiān)測(cè)保護(hù)系統(tǒng)勢(shì)在必行。微機(jī)型高壓電網(wǎng)繼電保護(hù)系統(tǒng)抗干擾能力強(qiáng)，通過(guò)鍵盤(pán)與液晶顯示單元可以方便的進(jìn)行現(xiàn)場(chǎng)觀察與各種保護(hù)方式與保護(hù)參數(shù)的設(shè)定。普通的采集處理方法對(duì)多路進(jìn)行采樣計(jì)算顯得困難，為了克服以上不足，滿足現(xiàn)代電力系統(tǒng)的要求，將先進(jìn)的數(shù)字信號(hào)處理（DSP）技術(shù)應(yīng)用到電力系統(tǒng)中充分發(fā)揮其強(qiáng)大的快速運(yùn)算和并行運(yùn)行處理能力，滿足電力系統(tǒng)監(jiān)控的實(shí)時(shí)性和處理算法的復(fù)雜性等要求，為電力系統(tǒng)的檢測(cè)技術(shù)中不斷發(fā)展的新理論和新算法應(yīng)用于實(shí)踐中奠定技術(shù)基礎(chǔ)。
本文是基于TI公司的TMS320LF2407A型DSP芯片作為高壓電繼電保護(hù)系統(tǒng)的中央處理器。通過(guò)MAX125的14位A/D轉(zhuǎn)換器采集高壓電網(wǎng)中交流模擬量來(lái)轉(zhuǎn)換為供DSP處理的數(shù)字量，從而進(jìn)行數(shù)據(jù)分析處理，對(duì)整個(gè)高壓電網(wǎng)的運(yùn)行狀況進(jìn)行實(shí)時(shí)監(jiān)控，當(dāng)遇到不良運(yùn)轉(zhuǎn)時(shí)控制外部繼電器迅速跳閘，切斷電網(wǎng)，從而保護(hù)整個(gè)電網(wǎng)及其他用電設(shè)備。

關(guān)鍵詞：TMS320LF2407A型DSP  交流采樣  MAX125A/D轉(zhuǎn)換器

Abstract
Along with the modernization of production mechanization and automation, capacity of power supply increased continuously, voltage of power grid continuously improve, the requirement of reliability of electrical equipment and technical requirements of the advanced nature getting higher and higher. It’s necessary to develop intelligent high-voltage protection monitoring system in order to guarantee personal and equipment security effectively. Microcomputer high-voltage power grid relay protection system has strong anti-interference capability, it is convenient to set that on-site observation protection methods and the protection of parameters through the keyboard and LCD display modules. Ordinary collecting method is difficult to calculate for multi-channel approach to sampling, in order to avoid the above inadequate and satisfy the requirements of modern power system, advanced digital signal processing (DSP) technology applications are introduced to the power system and show its strong rapid operational and run in parallel processing capability, which satisfy the requirements of real-time monitoring and processing algorithms, establishing a technology base in practice for continuous development of new theories and new algorithm in the power detection system.
Basing on TI Corporation's DSP chips TMS320LF2407A as high-voltage protection system CPU in this article, AC analog which comes from high voltage power grid is converted to digital value which DSP can process by 14-bit A/D converter MAX125, monitoring the entire status of the high-voltage power grid in real-time, tripping off by controlling external relay quickly when abnormal operation happened, turn off the power grid to protect the power grid and other electrical equipment.

Key Words：TMS320LF2407; Alternating Current Data Acquisition; MAX125A/D Converter