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Power line state monitoring method and device

A technology for monitoring devices and power transmission lines, applied in line transmission monitoring/testing, line transmission components, multi-frequency code systems, etc., can solve problems such as insufficient flexibility, huge overhead, and complexity of the power grid, and achieve the effect of reducing costs

Inactive Publication Date: 2012-12-19
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For medium and low-voltage lines, due to the large number and complexity of lines, manual inspection and maintenance can only be used for inspection and maintenance.
However, when the scale of the monitoring grid is large or in a high-risk area, the cost of laying and maintaining sensor networks and optical fiber networks will greatly increase, which will cause huge expenses for the grid, and it is difficult to lay communication auxiliary optical fibers for medium and low voltage circuits. and sensors; at the same time, the real-time performance of the impedance analysis method is also low, and additional professional instruments are required, and the flexibility is not enough

Method used

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  • Power line state monitoring method and device
  • Power line state monitoring method and device
  • Power line state monitoring method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1 provides a specific implementation manner in which the solution proposed by the present invention is used in power line transmission system based on TDS-OFDM technology to monitor and maintain system transmission line status.

[0037] This embodiment is aimed at a typical multi-carrier working mode of the PLC system, and the specific parameters are as follows: the carrier mode Z=3780, the transmitter constellation mapping mode is 16QAM, the frame header mode is PN945, and the FEC code rate is 0.4.

[0038] Such as figure 2 As shown, according to the method of monitoring and maintaining the state of the power line of the system described in this embodiment according to the embodiment of the present invention, the topology of the nodes is as follows image 3 As shown, the specific steps are as follows:

[0039] S1. Node A frames the known training sequence and the data to be sent modulated by TDS-OFDM technology, and sends the signal to the power line throu...

Embodiment 2

[0089] Embodiment 2 provides a specific implementation manner in which the solution proposed by the present invention is used in the power line transmission system to monitor and maintain the state of the system transmission line based on the CP-OFDM technology.

[0090] This embodiment is aimed at a typical multi-carrier working mode of the PLC system, and the specific parameters are as follows: the carrier mode Z=3780, the transmitter constellation map mapping mode is 64QAM, and the FEC code rate is 0.4.

[0091] Such as figure 2 As shown, according to the embodiment of the present invention, the method for monitoring and maintaining the state of the power line of the system described in this embodiment, the specific steps are as follows:

[0092] S1. Node A frames the known training sequence and the data to be sent modulated by OFDM technology, and sends the signal to the power line through the coupler for transmission;

[0093] In this embodiment, the data to be sent is ...

Embodiment 3

[0114] Embodiment 3 provides a specific implementation manner in which the solution proposed by the present invention is used in the power line transmission system to monitor and maintain the state of the system transmission line based on the ZP-OFDM technology.

[0115] This embodiment is aimed at a typical multi-carrier working mode of the PLC system, and the specific parameters are as follows: the carrier mode Z=3780, the transmitter constellation map mapping mode is 256QAM, and the FEC code rate is 0.6.

[0116] Such as figure 2 As shown, according to the embodiment of the present invention, the method for monitoring and maintaining the state of the power line of the system described in this embodiment, the specific steps are as follows:

[0117] S1. Node A frames the known training sequence and the data to be sent modulated by OFDM technology, and sends the signal to the power line through the coupler for transmission;

[0118] In this embodiment, the data to be sent is...

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Abstract

The invention provides a monitoring method of a power transmission line state in a power line communication system, wherein the monitoring method comprises the following steps: S1. a node A performs framing on the known training sequence and to-be-sent data modulated by an OFDM (orthogonal frequency division multiplexing) technology, and sends signals into a power line through a coupler for transmission; S2. a node B receives sent signals through the coupler, modulates the received signals by utilizing the known training sequence, and extracts transmission data; S3. the node B obtains transmission channel frequency response or impact response by utilizing the known training sequence; S4. the node B analyzes the channel frequency response, extracts relevant information of the transmission line, and obtains the variation information of basic parameters of the transmission line through analyzing the relevant information so as to calculate the channel parameters; and S5. the node B estimates and forecasts the channel state of the power transmission line according to channel parameter variation. According to the method provided by the invention, the state information of the power line can be monitored in real time, and a data collecting device and a communication system are not required to be arranged out of the power transmission line, and the monitoring method of the power transmission line state in the power line communication system has the advantages of good stability, low cost, and the like.

Description

technical field [0001] The invention belongs to the technical field of power line state monitoring, and in particular relates to a method and a device thereof for monitoring the state of a transmission line of a power line communication system based on OFDM technology. Background technique [0002] In the power transmission system, because the medium and long-distance transmission lines are exposed to the ground and are affected by severe weather such as wind, frost, rain and snow, the aging of the lines will be caused. The aging of the line will reduce the transmission efficiency of the power line, generate more energy dissipation, lead to unstable power supply of the power grid, and even cause safety hazards. For this reason, the monitoring of the power line is very important in the power transmission system. Various technologies for combating the aging of the power line and methods for detecting the state of the power line have been proposed and applied. [0003] At pres...

Claims

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Application Information

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IPC IPC(8): H04B3/46H04L27/26
Inventor 任飞杨昉丁文伯李嘉宋健阳辉潘长勇
Owner TSINGHUA UNIV
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