基于ARM微處理器的電參數測量設

測控論文編號:CK079   論文字數:17063,頁數:48

 目 錄
摘要………………………………………………………………………………………………I
1 緒論……………………………………………………………………..……………………..1
2 總體設計方案………………………………………………………….………………….....2
2.1 系統總體結構…………………………………………………….……………….……2
3 電參數采集測量系統模塊……………………………………….……...………………..3
 3.1 ADS8365介紹……………………………………………………………..…………… 3
  3.1.1 ADS8365的主要特性………………………………….….….………………...3
  3.1.2 ADS8365前端調理電路…………………………………………………..……4
        3.1.2 ADS8365的操作及軟件編程…………………………………………………..5
 3.2 微處理器LPC2138介紹………………………………….……………………………6
  3.2.1 LPC2138性能介紹………………………………….….………………………6
  3.2.2 LPC2138定時計數器應用…………………………..…………………………7
  3.2.3 LPC2138I2C中斷應用…………………………………………………………8
  3.2.4 關于中斷嵌套的實現…………………………………………………………10
4 三相電壓、電流以及功率的測量……………………………………………………...11
 4.1 電壓信號的前置處理…………………………………………………………………11
 4.1.1 微型精密電壓傳感器介紹…………………………… ……………………...11
  4.1.2 電壓采樣電路原理…………………………………………………………….12
 4.2 電流信號的前置處理……………………………………….…………………………12
 4.3 功率測量原理介紹………………………………………….…………………………13
5 頻率和相位的測量……………………………………….……..…………………………14
 5.1 頻率測量方法介紹…………………………………..……….…….…………………14
 5.2 相位測量方法介紹……………………………………………………………………14
6 人機界面模塊設計………………………………………..………………………………16
 6.1 液晶顯示模塊介紹……………………………………………………………………16
 6.1.1 SED1335的特點和結構…………………………………………………………16
 6.1.2 SED1335指令集…………………………………………………………………17
 6.1.3 接口電路設計及編程原理……………….………………………………………18
 6.2 界面操作模塊介紹…………………………...…..……………………………………19
 6.2.1 I2C總線器件PCF8574介紹……………………………….………………19
 6.2.2 旋轉式光電編碼開關功能介紹…………………………………………………20
 6.2.3 編碼開關軟件實現………………………………………….…………………..21
7 測量策略與誤差分析………………………………………………………………………23
 7.1 參數自尋優采樣法的實現…………………………………………………..…………23
 7.2 數字校準技術實現…………………………………………………………..…………23
 7.3 交流采樣誤差分析……………………………………………………..……………24
8 總結……………………………………………………………………………………………26
致謝………………………………………………………………………………………………27
參考文獻…………………………………………………………………………………………28
附錄1 實物圖………..……………………………………………………………………………30
附錄2 參數測量系統C語言程序…..…………………………………………………………30

摘  要
 
 電力是人們日常生活和工業生產中的主要能源，在現代社會中起著越來越重要的作用。對電參數的測量包括對電網中交流電壓、電流、功率、頻率和相位等參數的測量，它在電力系統中起著非常重要的作用。傳統的電參數測量儀實時性差、精度較低、硬件電路復雜、不易調試、可靠性低而成本高。本課題研究的對電參數測量的方法是基于32位ARM微處理器LPC2138和16位6通道同步采樣AD轉換芯片ADS8365為核心的先進芯片去實現的。對電網中最重要的電參數三相電壓電流完成高速、高精度的同步采樣，使儀器的電壓電流的測量精度和實時性大為提高。同時儀器運用了軟件智能同步采樣測量策略、智能儀器的數字校準，這也是傳統電參數測量無法比擬的，并且結合由液晶顯示器和旋轉式光電編碼開關構成的人機交互界面，使電參數儀器的操作向智能化邁進，因而具有一定的先進性和較廣的應用面。
關鍵詞 ARM微處理器；交流電參數；數字校準；ADS8365；相位

Abstract

Power is major energy in the daily lives and industrial production, it is playing an increasingly important role in modern society. Measurement of electrical parameters including the measurement of AC voltage, AC current, power, frequency and phase etc, it plays an important role in power system . Traditional measurement of electrical parameters is poor of real-time, low accuracy, complex hardware and difficult to debug, the high cost and low reliability. The research on the measurement of electrical parameters is based on the advanced chips of 32-bit ARM microprocessor LPC2138 and 16-bit 6-channel simultaneous sampling AD converter ADS8365 to achieve. The completion of high-speed, high-precision synchronous sampling in the most important electrical parameters of three-phase voltage and current in power network, making the measuring precision of the instrument and the real-time of measuring the voltage and current have greatly improved. At the same time, synchronous sampling measurement using the software strategy of intelligent, the number of intelligent instrument calibration, which is the traditional measurement of electrical parameters can not be compared. And it also combined man-machine interface which consisting of LCD and Rotary photoelectric encoder rotary switch, so that electrical parameters equipment forward to the intelligent operation, which is advanced, and have a wide range of applications.
Keywords ARM microprocessor; AC parameters; digital calibration; ADS8365; phase