At present, there are great differences in the types and methods of sensing devices supporting the power grid digital twin to realize full sensing. Only relying on the point-to-point setting method to realize a large amount of interactive information between the sensor and the digital twin virtual body cannot meet the application requirements. In order to solve the above problems, a power grid digital twin data embedding method is provided. The perception information is sent to the corresponding digital twin according to the matching degree between the digital twin scene semantic attribute and the perception device scene semantic attribute, so that the corresponding digital twin can embed the perception data in the perception information into the data set corresponding to the relevant service function. It can realize the flexible adaptive mapping between the perceived information and the digital twin, ensure the automatic matching and access of various sensing devices, improve the adaptability between the perceived information and the digital twin, avoid the problem of insufficient interaction ability of virtual and real mapping caused by manual point-to-point setting, and effectively promote the development of various power application services based on the power grid digital twin
A distributed Brillouin optical fiber sensing system scheme is proposed and experimentally demonstrated. It adopts a digital down-conversion module to replace the traditionally used radio frequency (RF) power amplifier, local oscillator (LO) and mixer for Brillouin spectrum sweeping and sampling, which makes the new sensing system cost-effective with good performance. And a Brillouin spectrum extraction method that is based on cubic Spline interpolation is also employed in the proposed sensing system to enhance the efficiency for the Brillouin center frequency extraction. According to the feature of Brillouin spectrum such as waveform and bandwidth, the peak power point is searched first, and then the range of Brillouin spectrum for data interpolation is determined, and finally by cubic Spline interpolation, the center frequency of Brillouin spectrum can be accurately extracted. In the experiment, with probe pulse peak power of 20dBm and pulse width of 10 microseconds, the sensing system obtains a 40dB double way dynamic range, and it just takes about 8 seconds to extract the center frequency of the Brillouin spectrum along an optical fiber with length of 25.2km. The accuracy for the Brillouin center frequency extraction along the whole optical fiber is about ±1.0MHz, which agrees well with the expectation for practical application.
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