模拟信号在光纤中的传输方案研究
发布时间：2018-11-14 19:23
【摘要】：在这个科技日益更新的时代,对高压隔离的问题显得越来越重要,要想对电压互感器的高压隔离的问题有一定的解决措施,设想在高、低压端用光纤来传输模拟信号,这样既可以节省了互感器的生产成本,也可以有效地隔离高压,还可以使得在输变电站控制中心收到的隔离信号能够比较准确合理。为了解决对高压直流输电母线的电压参数进行测量的问题,在本篇论文中我们设计出一种将数字化信号的传输和光纤通信结合到一起的方案来达到这个要求,把这个在工业工程中的问题简化到理论实验中去展开。针对此问题,本文设计了如下的研究方案：首先我们把产生的0-5V的模拟信号作为模拟信号光纤传输单元中的输入信号,再通过光发送端中的A/D转换器将输入的模拟信号相应地转换为数字信号,同时将从A/D端口输出的转换好的数字信号用数据锁存器将信号锁存起来,然后再经过发送端中的并／串转换器将传输过来的数字信号的形式由并行转变为串行,这样操作是为了便于后续CMI编码使用。再由CMI编码器根据编码规则对串行信号进行编码,经过光纤将信号传输到光接收端,将接收到的串行码流在接收端的CMI译码器中进行译码,再由串并转换器将译码后的信号的形式转变为并行的,输出的并行信号应该与之前发送断输入的并行信号相同,若不同则表示译码出错。然后经过D/A转换器将接收到的数字信号转变成对应的模拟信号,最后再通过低通滤波器将收到的信号中杂质信号滤除掉,这样做是为了能够得到更精确的值,得到的模拟信号后与输入时的进行比较,在一定误差范围内都可以认为是正确的。完成以上步骤,就基本完成了模拟信号光纤传输的整个过程。由于在实际生活中,我们需要将信号送到供电站,所以最后我们还需利用微处理器对接收到的模拟信号进行数据处理后直接供电站使用。这样也是方便供电站观察电压稳定情况。根据设计出来的方案,按照以上一步步进行实验操作,最终实验结果表明,将输出的电压信号与输入的电压进行比较,发现误差在1%以内,说明实验结果无误。也能反映出本论文中所设计的研究方案测量出来的数据精度高,误差小,整个系统的稳定性好,最重要的是能够解决高压隔离的问题。
[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.
【学位授予单位】：西安工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN253
本文编号：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.
【学位授予单位】：西安工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN253
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