Power line carrier communication self-adaptive impedance matching method

Abstract

The invention relates to a power line impedance matching technology, and discloses a matching method based on power line impedance acquisition and matching control, which detects a power line impedance value in real time when a signal is sent, and dynamically matches line impedance to enable the sending quality of the signal to be optimal. The output control signal is divided into a plurality of gears by adopting a threshold matching rule according to the signal output by the calculation control part, control is performed according to the gears, frequent adjustment of a matching module is avoided, and long-term operation reliability is ensured. The method comprises the steps of acquiring power line impedance through a power line impedance acquisition module; and obtaining the control quantity through operation processing of collected data to control the matching module to select proper matching impedance, so that the signal output power is increased to the maximum extent, and then thecommunication capability is improved.

Description

technical field [0001] The invention relates to medium-voltage power line carrier technology, in particular to an adaptive impedance matching method for power line carrier communication. Background technique [0002] In recent years, with the development of power systems, power line carrier channels have been widely used in information transmission such as power distribution automation and power consumption information collection, making power line carrier channels increasingly important, which puts forward higher requirements for the reliability of power line carrier channels. However, because the PLC system uses the power line as the communication channel, and the power line network is complex, coupled with the influence of channel attenuation, noise interference, and electromagnetic compatibility, the impedance of the power line changes randomly with time, which affects the communication quality. [0003] The impedance of the power line fluctuates on the line, generally t...

AI Technical Summary

Problems solved by technology

The current power line impedance matching method usually uses the typical impedance value on the line for matching. The real-time matching is poor, and the ability to deal with changes in the power line environment is limited, and it is easy to affect the communication effect when the environmental impedance changes.

[0005] There is also a method of automatic impedance matching. The method used is usually to collect impedance data after sending a specific signal, and then adjust the reactance value of the adjustable device to adapt to the environment. This method requires high real-time performance in collecting impedance data and poor matching power lines. The adjustment method used in impedance has reliability problems in long-term operation

Images