Method for establishing bidirectional link of power line carrier communication system
A power line carrier and two-way link technology, applied in the field of power communication, can solve the problems of poor frequency adaptability, reliability can not meet the needs of business communication, unable to adjust adaptively, etc., to improve reliability, improve flexibility, and improve system performance. The effect of reliability
Active Publication Date: 2015-09-23
STATE GRID CORP OF CHINA +3
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Problems solved by technology
[0003] At present, conventional PLC technology adopts fixed-frequency point communication mode to establish two-way links between points. Its operating frequency is usually determined before the carrier module leaves the factory, and it cannot be adaptively adjusted according to the actual power line carrier channel conditions and changes. , resulting in poor frequency adaptability to a certain extent, and the reliability cannot meet the communication needs of the business
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[0039] The present invention will be further described below in conjunction with accompanying drawing.
[0040] like figure 1 as shown, figure 1 It is a schematic diagram of point-to-point power line carrier communication system; the power line carrier communication system is composed of power line carrier communication equipment (carrier transceiver) and power line channel. The power line carrier communication equipment is responsible for the coupling and extraction of high-frequency carrier signals on the power line. The power line channel is a power network composed of multiple power lines and various power facilities and electrical equipment. Although the actual PLC network structure is relatively complex, two adjacent carrier communication devices can be regarded as a point-to-point topology structure, one of which is PLC device A, and the other carrier communication device is PLC device B . Two PLC carrier communication devices are connected through the power line cha...
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The invention provides a method for building a two-way link of a power-line carrier communication system. The method comprises the following steps that I, the transmission information of PLC equipment is determined; II, time synchronization is built; III, candidate frequency is estimated; IV, the two-way link is built. The method is used for building the two-way link based on a frequency cognition technology, the work frequency selection range of a PLC system is expanded into thirty MHz from thirty KHz, both sides in communication can select the optimal communication frequency in a self-adaption mode according to respective channel conditions, and therefore the reliability of a PLC technology used for a smart power grid is enhanced.
Description
technical field [0001] The invention relates to a method in the field of electric power communication, in particular to a method for establishing a bidirectional link in a power line carrier communication system. Background technique [0002] Power line communication technology is a communication method that uses power cables as a communication medium to transmit data information. The conventional power line communication technology is to load the modulated high-frequency carrier signal on the existing power line for communication. Therefore, power line communication is usually called power line communication (Power Line Communications, PLC). According to the voltage level of carrier communication lines, PLC technology generally includes: high-voltage power line carrier communication using high-voltage transmission lines with a voltage level of 35kV and above as the communication medium, and medium-voltage power line carrier communication using medium-voltage transmission li...
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IPC IPC(8): H04B3/54
Inventor 陆阳刘伟麟杨冰高鸿坚李建岐陶峰赵涛褚广斌李晓龙魏明磊孙辰军
Owner STATE GRID CORP OF CHINA