【摘要】：在這個(gè)科技日益更新的時(shí)代,對(duì)高壓隔離的問題顯得越來越重要,要想對(duì)電壓互感器的高壓隔離的問題有一定的解決措施,設(shè)想在高、低壓端用光纖來傳輸模擬信號(hào),這樣既可以節(jié)省了互感器的生產(chǎn)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(hào)能夠比較準(zhǔn)確合理。為了解決對(duì)高壓直流輸電母線的電壓參數(shù)進(jìn)行測(cè)量的問題,在本篇論文中我們?cè)O(shè)計(jì)出一種將數(shù)字化信號(hào)的傳輸和光纖通信結(jié)合到一起的方案來達(dá)到這個(gè)要求,把這個(gè)在工業(yè)工程中的問題簡(jiǎn)化到理論實(shí)驗(yàn)中去展開。針對(duì)此問題,本文設(shè)計(jì)了如下的研究方案：首先我們把產(chǎn)生的0-5V的模擬信號(hào)作為模擬信號(hào)光纖傳輸單元中的輸入信號(hào),再通過光發(fā)送端中的A/D轉(zhuǎn)換器將輸入的模擬信號(hào)相應(yīng)地轉(zhuǎn)換為數(shù)字信號(hào),同時(shí)將從A/D端口輸出的轉(zhuǎn)換好的數(shù)字信號(hào)用數(shù)據(jù)鎖存器將信號(hào)鎖存起來,然后再經(jīng)過發(fā)送端中的并／串轉(zhuǎn)換器將傳輸過來的數(shù)字信號(hào)的形式由并行轉(zhuǎn)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(jù)編碼規(guī)則對(duì)串行信號(hào)進(jìn)行編碼,經(jīng)過光纖將信號(hào)傳輸?shù)焦饨邮斩?將接收到的串行碼流在接收端的CMI譯碼器中進(jìn)行譯碼,再由串并轉(zhuǎn)換器將譯碼后的信號(hào)的形式轉(zhuǎn)變?yōu)椴⑿械?輸出的并行信號(hào)應(yīng)該與之前發(fā)送斷輸入的并行信號(hào)相同,若不同則表示譯碼出錯(cuò)。然后經(jīng)過D/A轉(zhuǎn)換器將接收到的數(shù)字信號(hào)轉(zhuǎn)變成對(duì)應(yīng)的模擬信號(hào),最后再通過低通濾波器將收到的信號(hào)中雜質(zhì)信號(hào)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(hào)后與輸入時(shí)的進(jìn)行比較,在一定誤差范圍內(nèi)都可以認(rèn)為是正確的。完成以上步驟,就基本完成了模擬信號(hào)光纖傳輸?shù)恼麄�(gè)過程。由于在實(shí)際生活中,我們需要將信號(hào)送到供電站,所以最后我們還需利用微處理器對(duì)接收到的模擬信號(hào)進(jìn)行數(shù)據(jù)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(jù)設(shè)計(jì)出來的方案,按照以上一步步進(jìn)行實(shí)驗(yàn)操作,最終實(shí)驗(yàn)結(jié)果表明,將輸出的電壓信號(hào)與輸入的電壓進(jìn)行比較,發(fā)現(xiàn)誤差在1%以內(nèi),說明實(shí)驗(yàn)結(jié)果無誤。也能反映出本論文中所設(shè)計(jì)的研究方案測(cè)量出來的數(shù)據(jù)精度高,誤差小,整個(gè)系統(tǒng)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(xué)位授予單位】：西安工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN253

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本文編號(hào)：2332073