Fine synchronization detection method suitable for medium-voltage power line carrier communication

Abstract

The invention provides a fine synchronization detection method suitable for medium-voltage power line carrier communication, and the method comprises the following steps: collecting a specific synchronization waveform, performing cross-correlation calculation on waveform data and local data to obtain a cross-correlation coefficient, and locking a fine synchronization position by polling a maximum value of the cross-correlation coefficient in a code source, thereby enhancing the robustness of judgment. The method does not only depend on a power line single carrier communication technology, avoids the influence of power line frequency selective attenuation, adopts a specific multi-carrier mode, enhances the performance of a communication system, and has positive significance for the state grid company to integrally control the operation information acquisition of a power line.

Description

technical field [0001] The invention belongs to the field of electric power technology, and in particular relates to a fine synchronization detection method suitable for medium-voltage power line carrier communication. Background technique [0002] 10kV lines are widely used in my country's medium-voltage overhead distribution line network, using power lines that transmit electric energy to transmit information. This communication method is developed according to the unique conditions of the power system, and has good economy and reliability. [0003] For the information transmission on the 10kV line, the past experience is mainly based on the laying of optical fiber, etc., which mainly has disadvantages such as high cost and difficult construction. However, the cost of communication based on the power line carrier is low and the construction is relatively simple. However, due to the interference of the 10kV line channel The characteristics of complex characteristics, large ...

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Problems solved by technology

[0003] For the information transmission on the 10kV line, the previous experience is mainly based on the laying of optical fiber, etc., which mainly has disadvantages such as high cost and difficult construction. However, the cost of communication based on the power line carrier is low and the construction is relatively simple. However, due to the interference of the 10kV line channel It has complex characteristics, large randomness, large time variation, and large signal attenuation. It is difficult to perform precise fine synchronization, resulting in poor communication effect based on power line carrier. Currently, it is mainly used to ensure the stability of communication based on power line carrier. The method is to use a single carrier for fine synchronization detection by studying the characteristics of the entire line: this method sends a single carrier waveform at a specific frequency point at the sending end, and its carrier has certain characteristics, and sends several symbols with the same phase; According to the characteristics of the carrier at the sending end, the receiving end performs phase detection. When the characteristics of the carrier at the sending end are found, it is judged that the fine synchronization is successful; The demodulation of multi-carrier transmission information is fatal, and the 10KV line has frequency attenuation characteristics. If the single carrier used for fine synchronization has a particularly large attenuation in the power line channel, the accuracy of fine synchronization will also be greatly reduced.

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