模擬信號在光纖中的傳輸方案研究
發(fā)布時間：2018-11-14 19:23
【摘要】：在這個科技日益更新的時代,對高壓隔離的問題顯得越來越重要,要想對電壓互感器的高壓隔離的問題有一定的解決措施,設想在高、低壓端用光纖來傳輸模擬信號,這樣既可以節(jié)省了互感器的生產成本,也可以有效地隔離高壓,還可以使得在輸變電站控制中心收到的隔離信號能夠比較準確合理。為了解決對高壓直流輸電母線的電壓參數進行測量的問題,在本篇論文中我們設計出一種將數字化信號的傳輸和光纖通信結合到一起的方案來達到這個要求,把這個在工業(yè)工程中的問題簡化到理論實驗中去展開。針對此問題,本文設計了如下的研究方案：首先我們把產生的0-5V的模擬信號作為模擬信號光纖傳輸單元中的輸入信號,再通過光發(fā)送端中的A/D轉換器將輸入的模擬信號相應地轉換為數字信號,同時將從A/D端口輸出的轉換好的數字信號用數據鎖存器將信號鎖存起來,然后再經過發(fā)送端中的并／串轉換器將傳輸過來的數字信號的形式由并行轉變?yōu)榇?這樣操作是為了便于后續(xù)CMI編碼使用。再由CMI編碼器根據編碼規(guī)則對串行信號進行編碼,經過光纖將信號傳輸到光接收端,將接收到的串行碼流在接收端的CMI譯碼器中進行譯碼,再由串并轉換器將譯碼后的信號的形式轉變?yōu)椴⑿械?輸出的并行信號應該與之前發(fā)送斷輸入的并行信號相同,若不同則表示譯碼出錯。然后經過D/A轉換器將接收到的數字信號轉變成對應的模擬信號,最后再通過低通濾波器將收到的信號中雜質信號濾除掉,這樣做是為了能夠得到更精確的值,得到的模擬信號后與輸入時的進行比較,在一定誤差范圍內都可以認為是正確的。完成以上步驟,就基本完成了模擬信號光纖傳輸的整個過程。由于在實際生活中,我們需要將信號送到供電站,所以最后我們還需利用微處理器對接收到的模擬信號進行數據處理后直接供電站使用。這樣也是方便供電站觀察電壓穩(wěn)定情況。根據設計出來的方案,按照以上一步步進行實驗操作,最終實驗結果表明,將輸出的電壓信號與輸入的電壓進行比較,發(fā)現誤差在1%以內,說明實驗結果無誤。也能反映出本論文中所設計的研究方案測量出來的數據精度高,誤差小,整個系統的穩(wěn)定性好,最重要的是能夠解決高壓隔離的問題。
[Abstract]:In this era of increasingly updated science and technology, the problem of high-voltage isolation is becoming more and more important. In order to solve the problem of high-voltage isolation of voltage transformers, imagine using optical fibers at the high and low voltage terminals to transmit analog signals. This not only saves the production cost of the transformer, but also can effectively isolate the high voltage, and can make the isolated signal received in the control center of the transmission substation more accurate and reasonable. In order to solve the problem of measuring voltage parameters of HVDC bus, we design a scheme to combine digital signal transmission and optical fiber communication to achieve this requirement. Simplify this problem in industrial engineering to theoretical experiments. In order to solve this problem, this paper designs the following research schemes: first, we take the 0-5V analog signal as the input signal in the analog signal fiber transmission unit. Then the input analog signal is converted into digital signal through the A / D converter in the optical transmitter, and the converted digital signal output from the Ar / D port is locked up with a data latch. Then the transmitted digital signal is changed from parallel to serial through the parallel / serial converter in the transmitter, so that the operation is easy to use in subsequent CMI coding. Then the CMI encoder encodes the serial signal according to the encoding rules, transmits the signal to the optical receiver through optical fiber, and decodes the received serial code stream in the CMI decoder at the receiving end. The output parallel signal should be the same as the parallel signal sent before, if the difference indicates that the decoding error occurs. Then the DPA converter converts the received digital signal into the corresponding analog signal, and then filters the impurity signal from the received signal through a low-pass filter, in order to get a more accurate value. The comparison between the analog signal and the input signal shows that it is correct in a certain range of errors. After completing the above steps, the whole process of analog signal fiber transmission is basically completed. In real life, we need to send the signal to the power supply station, so we also need to use the microprocessor to process the received analog signal and then use the power supply station directly. This is also convenient for power stations to observe voltage stability. According to the designed scheme, the experimental operation is carried out according to the above step by step. The final experimental results show that the error between the output voltage signal and the input voltage is less than 1%, which shows that the experimental results are correct. It can also reflect the high accuracy, small error and stability of the whole system, and the most important thing is to solve the problem of high voltage isolation.
【學位授予單位】：西安工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN253
本文編號：2332073
[Abstract]:In this era of increasingly updated science and technology, the problem of high-voltage isolation is becoming more and more important. In order to solve the problem of high-voltage isolation of voltage transformers, imagine using optical fibers at the high and low voltage terminals to transmit analog signals. This not only saves the production cost of the transformer, but also can effectively isolate the high voltage, and can make the isolated signal received in the control center of the transmission substation more accurate and reasonable. In order to solve the problem of measuring voltage parameters of HVDC bus, we design a scheme to combine digital signal transmission and optical fiber communication to achieve this requirement. Simplify this problem in industrial engineering to theoretical experiments. In order to solve this problem, this paper designs the following research schemes: first, we take the 0-5V analog signal as the input signal in the analog signal fiber transmission unit. Then the input analog signal is converted into digital signal through the A / D converter in the optical transmitter, and the converted digital signal output from the Ar / D port is locked up with a data latch. Then the transmitted digital signal is changed from parallel to serial through the parallel / serial converter in the transmitter, so that the operation is easy to use in subsequent CMI coding. Then the CMI encoder encodes the serial signal according to the encoding rules, transmits the signal to the optical receiver through optical fiber, and decodes the received serial code stream in the CMI decoder at the receiving end. The output parallel signal should be the same as the parallel signal sent before, if the difference indicates that the decoding error occurs. Then the DPA converter converts the received digital signal into the corresponding analog signal, and then filters the impurity signal from the received signal through a low-pass filter, in order to get a more accurate value. The comparison between the analog signal and the input signal shows that it is correct in a certain range of errors. After completing the above steps, the whole process of analog signal fiber transmission is basically completed. In real life, we need to send the signal to the power supply station, so we also need to use the microprocessor to process the received analog signal and then use the power supply station directly. This is also convenient for power stations to observe voltage stability. According to the designed scheme, the experimental operation is carried out according to the above step by step. The final experimental results show that the error between the output voltage signal and the input voltage is less than 1%, which shows that the experimental results are correct. It can also reflect the high accuracy, small error and stability of the whole system, and the most important thing is to solve the problem of high voltage isolation.
【學位授予單位】：西安工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN253
【參考文獻】
相關期刊論文 前5條
1 史延齡;計算機增強型并行口與頻率的高精度測量[J];電工技術雜志;2002年06期
2 王均梅;吳春風;王曉琪;;我國電力互感器的發(fā)展概況及應用現狀[J];電力設備;2007年01期
3 馮國斌,劉福華,楊鵬翎,趙軍衛(wèi),陳紹武;實用化寬帶模擬光纖傳輸系統[J];紅外與激光工程;2003年06期
4 郭全民;郭瑞;王健;閻建平;;高精度模擬信號光纖傳輸技術研究[J];西安工業(yè)大學學報;2008年01期
5 馬獻果,焦陽;頻率測量方法的改進[J];儀器儀表學報;2004年S1期
，本文編號：2332073
本文鏈接：http://www.sikaile.net/kejilunwen/dianzigongchenglunwen/2332073.html
