Characteristic current identification method suitable for low-voltage transformer area
A low-voltage station area and current identification technology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problems of identification failure, influence on demodulation results, and low signal-to-noise ratio of current signals, so as to improve identification accuracy, The effect of ensuring accuracy and minimizing the influence of noise
Inactive Publication Date: 2022-06-07
QINGDAO TOPSCOMM COMM +1
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However, the power line is mainly used to transmit electric energy. The noise in the transmission channel is large, and the signal-to-noise ratio of the current signal at the receiving end is low, which can easily affect the demodulation result. Failure, seriously affecting the recognition accuracy
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[0033] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to illustrate the present invention, but not to limit the present invention.
[0034] Example.
[0035] This embodiment proposes a characteristic current identification method suitable for a low-voltage station area. The core idea of the method is: in a low-voltage station area, the device at the transmitting end transmits a characteristic current signal of a certain center frequency to the power grid, and in the power grid line The other equipment receives the characteristic current signal, calculates the intensity of the characteristic current signal based on the discrete Fourier transform sliding, demodulates the identification code, performs cross-correlatio...
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The invention relates to the technical field of power line carrier communication, and discloses a characteristic current identification method suitable for a low-voltage transformer area, comprising the following steps: transmitting a characteristic current signal to a power grid by a transmitting end device of the low-voltage transformer area; other devices in the power grid line receive the current signal, and the intensity of the characteristic current signal is calculated in a sliding mode through discrete Fourier transform; demodulating an identification code according to the characteristic current signal intensity, and performing cross-correlation calculation on the identification code and the characteristic code to obtain a correlation value; and if the correlation value is greater than the threshold value, judging that the characteristic current signal is identified, otherwise, judging that the characteristic current signal is not identified. According to the method, the identification code and the feature code do not need to be completely consistent, the feature current signal can be identified based on the calculated correlation value of the feature code and the identification code, the influence of noise in a power channel is minimized, the identification accuracy of the feature current signal is effectively improved, and therefore the accuracy of topology identification of the low-voltage transformer area is guaranteed.
Description
technical field [0001] The invention relates to the technical field of power line carrier communication, in particular to a characteristic current identification method suitable for low-voltage station areas. Background technique [0002] The distribution network is an important part of the smart grid architecture, and the topology of the low-voltage distribution network is a key part of distribution management. [0003] In the future, the trend of distribution network management will gradually transform from the traditional extensive management to the modern refined management, and the realization of the refined management requires an accurate topology structure. At the same time, the topology of the low-voltage station area also plays an important role in the maintenance and repair of the power line, the stable operation of the power grid, and the accurate measurement of electric energy. [0004] The existing topology identification methods of low-voltage station area are...
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IPC IPC(8): H02J13/00H02J3/00H04B3/54
CPCH02J13/0001H02J3/00H04B3/54H02J2203/10H04B2203/5404Y02D30/70
Inventor 曹乾磊王金龙张鹏程梁浩彭绍文
Owner QINGDAO TOPSCOMM COMM