CN110839293B - Power transmission line state monitoring agent device - Google Patents
Power transmission line state monitoring agent device Download PDFInfo
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- CN110839293B CN110839293B CN201911091042.XA CN201911091042A CN110839293B CN 110839293 B CN110839293 B CN 110839293B CN 201911091042 A CN201911091042 A CN 201911091042A CN 110839293 B CN110839293 B CN 110839293B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 63
- 230000005540 biological transmission Effects 0.000 title claims abstract description 44
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- 238000004220 aggregation Methods 0.000 claims abstract description 67
- 238000004891 communication Methods 0.000 claims description 41
- 238000000034 method Methods 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 description 29
- 102100024539 Chymase Human genes 0.000 description 10
- 101000909983 Homo sapiens Chymase Proteins 0.000 description 10
- 101150082804 cmaA2 gene Proteins 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
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- 238000005516 engineering process Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000012806 monitoring device Methods 0.000 description 3
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- 230000004931 aggregating effect Effects 0.000 description 1
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- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
Abstract
The invention relates to a power transmission line state monitoring proxy device, which belongs to the technical field of power transmission line state monitoring, and comprises an MCU and at least one carrier aggregation radio frequency module, wherein the MCU is connected with the carrier aggregation radio frequency module; each carrier aggregation radio frequency module aggregates a plurality of different frequency bands; the MCU is used for acquiring channel quality information between the MCU and the adjacent state monitoring agent device through the carrier aggregation radio frequency module to judge channel quality, controlling the carrier aggregation radio frequency module to switch channels according to the channel quality, and simultaneously sending a channel switching instruction to the adjacent state monitoring agent device; and when the MCU is used for receiving the channel switching instruction sent by the adjacent state monitoring agent device through the carrier aggregation radio frequency module, the MCU is used for controlling the channel switching, so that the problems of poor transmission quality and low reliability of the regional data without the OPGW access point in the existing public network are solved.
Description
Technical Field
The invention relates to a power transmission line state monitoring proxy device, and belongs to the technical field of power transmission line state monitoring.
Background
The power transmission line is an important component of a power grid framework, a network and functions, the power transmission line monitoring aims at timely finding problems of aging, corrosion, damage and the like of the power transmission line caused by internal and external reasons such as dirt, weather, geology, load and the like, is an important content of operation and maintenance work, and has direct influence on the operation quality of the power transmission line and the operation efficiency of the whole power grid. In actual operation and maintenance work, the periodic monitoring of the transmission line is mainly carried out in three modes of manual inspection, unmanned aerial vehicle inspection and manned helicopter inspection, but the three monitoring modes have some outstanding problems:
1. the manual inspection is easily affected by the geographical environment, and has poor timeliness and low efficiency;
2. the inspection of unmanned aerial vehicles and manned helicopters is greatly influenced by weather and geographic environments;
3. in the areas of three spans (high-speed railways, highways, power transmission lines) of the power transmission line, mountain-opening, building construction and other areas, the situations that the power transmission line is damaged by external force, the line protection area is infringed and the like exist, the three inspection modes cannot find and keep the site in time, and when relevant responsibility and legal problems are handled, management units are always weak in maintenance right due to no evidence data which is direct or persuasive, and huge losses are incurred.
The existing method uses sensors to collect and analyze graph, image, video and industrial measurement data (tower inclination, microclimate, insulator, infrared temperature measurement, external damage prevention and the like) of the power transmission line, and realizes real-time monitoring and automatic alarming of the power transmission line state. The data transmission is divided into two parts: 1. a local data acquisition network (local data collocation network, LDCN) responsible for acquiring graphics, images, video and industrial measurement data of the present tower sensor; 2. and the data remote communication network (data remote transmission network, DRTN) is responsible for transmitting the graph, the image, the video and the industrial measurement data of each tower to a remote master station. The system architecture is shown in fig. 1, and the state monitoring equipment (condition monitoring device, CMD) of the local towers collect data, and transmit the data to the CMA of the local towers through the LDCN, and the CMA of each tower transmits the monitoring data to the monitoring master station through the DRTN.
The existing DRTN generally adopts a mode of combining one or more communication methods of 2G, 3G, 4G, wi-Fi, wiMAX (worldwide interoperability for microwave access, wiMAX), 5.8GHz microwave and OPGW (optical fiber composite overhead ground wire, OPGW), adopts 2G, 3G or 4G wireless communication in a region with good public network wireless signals, adopts a wired communication mode of the OPGW in a region with bad public network signals, and adopts a wireless communication mode of 5.8GHz, wi-Fi or WiMAX in a region with bad public network signals and no OPGW access point. However, in the area where the public network signal is not good and there is no OPGW access point, the following three problems exist in the wireless communication method using 5.8GHz, wi-Fi or WiMAX:
1. the coverage area of a single WiMAX base station is wide, but the base station needs to be built, the investment cost is high, and the 360-degree wide coverage mode of the base station is not suitable for the scene of a linear transmission line. And the construction of the WiMAX base station involves the authority problem.
2. When the coverage area of Wi-Fi Access Points (APs) is small and the distance between towers is large, a single AP can only cover the range of the base tower, is suitable for being used as a communication mode of LDCN and is not suitable for being used as a communication mode of DRTN;
3. the 5.8GHz microwave communication technology adopts a point-to-point communication mode, can flexibly ad hoc network, does not need to build a base station, has low investment cost and transmission distance of 8-10km, and can meet the requirements of DRTN. Compared with Wi-Fi and WiMAX technologies, the 5.8GHz microwave communication technology is more suitable for communication in areas with poor public network signals and no OPGW access points. But the 5.8GHz frequency is high, the wavelength is short, the diffraction capacity is poor, the energy attenuation is large when the wireless communication system encounters an obstacle, the propagation distance is shortened, and the quality of the 5.8GHz wireless communication is easily influenced by the obstacles such as a pole tower, leaves and the like.
Therefore, a CMA of a power transmission line monitoring system capable of resisting interference is needed to solve the problems of poor data transmission quality and low reliability in the area where the public network condition is not good and there is no OPGW access point.
Disclosure of Invention
The invention aims to provide a power transmission line state monitoring proxy device, which solves the problems of poor data transmission quality and low reliability of the area without an OPGW access point in the prior public network.
The invention adopts the following technical scheme: the power transmission line state monitoring agent device comprises an MCU and at least one carrier aggregation radio frequency module, wherein the MCU is connected with the carrier aggregation radio frequency module; each carrier aggregation radio frequency module aggregates a plurality of different frequency bands;
the MCU is used for acquiring channel quality information between the MCU and the adjacent state monitoring agent device through the carrier aggregation radio frequency module to judge channel quality, controlling the carrier aggregation radio frequency module to switch channels according to the channel quality, and simultaneously sending a channel switching instruction to the adjacent state monitoring agent device;
and the MCU is also used for controlling the channel switching when receiving the channel switching instruction sent by the adjacent state monitoring agent device through the carrier aggregation radio frequency module.
The invention can realize the automatic frequency modulation function by aggregating a plurality of frequency bands in the radio frequency module in the state monitoring agent device CMA, monitoring the channel quality in real time and controlling the switching channel when the channel quality is poor, has strong anti-interference capability and improves the communication quality, and can realize the reliable communication of the transmission line by the state monitoring agent device without constructing a base station or an AP and only transmitting data to the state monitoring agent device in the area with good public network signal or the OPGW access point.
Further, the channel quality information includes: RSRP, SINR, and data transmission rate information.
Further, if the RSRP, the SINR and the data transmission rate information are respectively smaller than the corresponding judgment thresholds, the carrier aggregation radio frequency module is controlled to switch channels, and meanwhile, a channel switching instruction is sent to the adjacent state monitoring agent device.
Further, the state monitoring agent device comprises a first carrier aggregation radio frequency module, a second carrier aggregation radio frequency module and a data exchange module, wherein the first carrier aggregation radio frequency module and the second carrier aggregation radio frequency module are connected with the MCU through the data exchange module.
Further, the state monitoring agent device further comprises a multi-mode communication terminal module, and the multi-mode communication terminal module is connected with the data exchange module.
Further, the state monitoring agent device further comprises a power supply and a power management module, wherein the power supply is respectively connected with the MCU, the data exchange unit, the first carrier aggregation radio frequency module and the second carrier aggregation radio frequency module through the power management module.
Further, the multi-mode communication terminal module includes a 2G terminal module, a 3G terminal module, and/or a 4G terminal module.
Further, each carrier aggregation radio frequency module aggregates frequency bands of 2.4GHz and 5.8 GHz.
Drawings
FIG. 1 is a diagram of a prior art transmission line condition monitoring system architecture;
FIG. 2 is a block diagram of a device in embodiment 1 of the status monitoring agent device of the present invention;
FIG. 3 is a schematic diagram of the operation of the device in embodiment 1 of the condition monitoring agent apparatus of the present invention;
FIG. 4 is a schematic diagram of an ad hoc network system of the device in accordance with embodiment 1 of the present invention;
FIG. 5 is a block diagram of a device in embodiment 2 of the status monitoring agent device of the present invention;
fig. 6 is a schematic diagram of a device ad hoc network system in embodiment 2 of the status monitoring agent device of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
The features and capabilities of the present invention are described in further detail below in connection with the examples.
Status monitoring agent device embodiment 1:
aiming at the problem that the quality of 5.8GHz wireless communication is easily affected by obstacles such as towers and leaves, the embodiment designs a state monitoring agent (condition monitoring agent, CMA) device (hereinafter referred to as CMA) which is used for 2.4GHz and 5.8GHz frequency band carrier aggregation and can realize automatic frequency modulation; as other embodiments, other frequency bands may be aggregated, for example 900MHz, etc.
In this embodiment, a carrier aggregation radio frequency module is set in the CMA, where the carrier aggregation radio frequency module is configured by using an existing carrier aggregation method, and belongs to the prior art, and the carrier aggregation radio frequency module aggregates carriers in frequency bands of 2.4GHz and 5.8GHz by using the carrier aggregation method, so as to obtain 13 total 26 channels in frequency bands of 2.4GHz and 5.8GHz, each channel has a bandwidth of 20MHz, and DSSS (direct sequence spread spectrum) technology is used, so that a single module does not need switching and mutual exclusion operations between modules.
As shown in fig. 2, the MCU is connected with a carrier aggregation radio frequency module; the carrier aggregation radio frequency module acquires channel quality information between the carrier aggregation radio frequency module and a state monitoring agent device arranged on an adjacent tower pole to judge channel quality, and controls the carrier aggregation radio frequency module to switch channels according to the channel quality, and simultaneously sends a channel switching instruction to the adjacent state monitoring agent device;
and the MCU is also used for controlling the channel switching when receiving the channel switching instruction sent by the adjacent state monitoring agent device through the carrier aggregation radio frequency module.
After the process of negotiating the communication channel between the state monitoring agent device and the adjacent state monitoring agent device is completed through the above process, the two parties needing to perform data interaction use a new channel for data transmission. The MCU is connected with a state monitoring device CMD through an LDCN interface such as RS232/RS485 interface, a ZigBee interface, a Lora interface, a Bluetooth interface and the like to acquire corresponding monitoring data, and the monitoring data is transmitted through the switched channel.
Meanwhile, in an area with a good public network signal, the MCU of the state monitoring agent device can be connected with the base station through the 2G terminal module, the 3G terminal module and/or the 4G terminal module, and is communicated with the monitoring master station through the base station; in the area where the OPGW access point exists, the MCU of the state monitoring agent device can also access the DRTN through the data exchange module to communicate with the monitoring master station.
The power transmission line state monitoring agent device further comprises a power supply and a power management module, wherein the power supply is connected with the MCU, the data exchange unit and the carrier aggregation radio frequency module through the power management module and used for providing a working power supply.
By the method, when the communication condition is bad, the two CMAs of the point-to-point communication can be automatically switched to a channel with good quality and perform the ad hoc network.
Specifically, the carrier aggregation radio frequency module in each CMA has two working modes, active and passive. The working principle is shown in figure 3.
1) And carrier aggregation is carried out on the plurality of carrier frequency bands by utilizing a carrier aggregation technology, so that the CMA has a plurality of channels.
2) The CMA for point-to-point communication is according to the preset working mode, initial working channel, channel switching threshold and channel switching strategy.
3) If the link is on, forwarding the data; otherwise, switching to the previous channel.
4) If the carrier aggregation radio frequency module in the CMA works in an active mode, the CMA receives RSRP, SINR values and data rate information periodically sent by an opposite terminal; if operating in passive mode, go to step 7).
5) Judging whether the channel needs to be switched according to the strategy, and if so, switching to 6); otherwise, go to 3). The RSRP, SINR values and data rates may be set by the user according to the actual situation, and the handover policy may be programmed by the user in a C-like language.
6) The CMA sends channel information to be switched to the opposite terminal, and sends a channel switching command to its own carrier aggregation radio frequency module, and goes to 3).
7) And periodically transmitting the RSRP, the SINR value and the data rate information to the opposite terminal.
8) And detecting whether a channel switching instruction sent by the opposite terminal is received, and if so, switching the channel according to the instruction. Turning to 3).
The following is a specific application example of the present embodiment.
As shown in fig. 4, in this embodiment, CMA1 and CMA2 of 2.4GHz and 5.8GHz frequency band carrier aggregation and point-to-point communication are taken as examples, and a process of automatically negotiating a communication channel by two adjacent CMAs to realize ad hoc network is described in detail.
(1) The user sets the parameters of both CMAs as in table 1.
Table 1:
(2) CMA1 and CMA2 operate as set forth in table 1, with CMA2 periodically sending RSRP, SINR values, and received data rates to CMA 1.
(3) After a period of time, due to seasonal reasons such as leaf shielding, the communication quality is reduced, and the CMA1 receives a message of CMA 2: RSRP < -85dBm, SINR <10, data rate= F2.
(4) CMA1 determines that F2 is less than 90% of the transmission traffic, transmits an instruction to switch the channel to 2.4GHz band channel 1 to CMA2, and switches its own channel to 2.4GHz band channel 1.
(5) CMA2 switches channels to 2.4GHz band channel 1.
(6) CMA1 and CMA2 successfully ad hoc network at 2.4GHz band channel 1 for communication.
(7) If one of CMA1 and CMA2 fails to switch channels, then both switch channels to the pre-switch channel.
Status monitoring agent device embodiment 2:
the difference between this embodiment and the above-mentioned embodiment 1 of the state monitoring agent device is that, as shown in fig. 5, two carrier aggregation rf modules, namely, a first carrier aggregation rf module and a second carrier aggregation rf module, are disposed in the CMA in this embodiment. The MCU is connected with two 2.4GHz and 5.8GHz carrier aggregation radio frequency modules, and the 2.4GHz and 5.8GHz carrier aggregation radio frequency modules send or receive data through the directional antenna.
As shown in fig. 6, taking CMA1 as an example, a first carrier aggregation radio frequency module and a second carrier aggregation radio frequency module are set in the CMA1 device, where the first carrier aggregation radio frequency module and the second carrier aggregation radio frequency module are connected with the MCU, and the CMA1 implements the above-mentioned process of switching channels according to channel quality with an adjacent CMA2 through the first carrier aggregation radio frequency module, and simultaneously, the CMA1 implements the above-mentioned process of switching channels according to channel quality with another adjacent CMA4 through the second carrier aggregation radio frequency module, thereby implementing the ad hoc network communication of multiple CMA devices in the transmission line section.
As an improvement of this embodiment, the CMA in this embodiment further includes a data exchange module, where the first carrier aggregation radio frequency module and the second carrier aggregation radio frequency module are connected to the MCU through the data exchange module.
And, this data exchange module can connect outside condition monitoring device for data exchange.
In addition, in this embodiment, the CMA further includes a multi-mode communication terminal module, where the multi-mode communication terminal module is connected to the data exchange module, and is configured to forward the acquired data. The multi-mode communication terminal module comprises a 2G terminal module, a 3G terminal module and/or a 4G terminal module.
In the above embodiment, the channel quality is determined by the received power (reference signal receiving power, RSRP), the signal-to-interference-plus-noise ratio (signal to interference plus noise ratio, SINR) and the data rate, and when the reference signal received power, the signal-to-interference-plus-noise ratio and the data rate of the current channel decrease to a certain threshold, the apparatus starts an automatic frequency modulation and channel detection process, frequency modulates to other channels, and selects a channel with the best quality for communication according to a set algorithm. The communication devices are equivalent in position, communicate in a point-to-point ad hoc network mode, a base station or an AP is not required to be built, the communication device is suitable for a scene of line type communication of a power transmission line, the working frequency covers a plurality of frequency bands, the range is wider, the anti-interference capability is stronger, and the communication quality is better.
The above description is only a preferred embodiment of the present invention, and the patent protection scope of the present invention is defined by the claims, and all equivalent structural changes made by the specification and the drawings of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The power transmission line state monitoring agent device is characterized by comprising an MCU, a first carrier aggregation radio frequency module, a second carrier aggregation module and a data exchange module, wherein the first carrier aggregation radio frequency module and the second carrier aggregation radio frequency module are connected with the MCU through the data exchange module; each carrier aggregation radio frequency module aggregates a plurality of different frequency bands;
the MCU is used for acquiring channel quality information between the MCU and the adjacent state monitoring agent device through the carrier aggregation radio frequency module to judge channel quality, controlling the carrier aggregation radio frequency module to switch channels according to the channel quality, and simultaneously sending a channel switching instruction to the adjacent state monitoring agent device;
the MCU is also used for controlling the channel switching when receiving the channel switching instruction sent by the adjacent state monitoring agent device through the carrier aggregation radio frequency module;
the proxy device realizes the process of switching channels according to the channel quality through the first carrier aggregation radio frequency module and one adjacent carrier aggregation radio frequency module, and realizes the process of switching channels according to the channel quality through the second carrier aggregation radio frequency module and the other adjacent carrier aggregation radio frequency module, so as to realize the self-networking communication of a plurality of proxy devices.
2. The transmission line status monitoring proxy device of claim 1, wherein the channel quality information comprises: RSRP, SINR, and data transmission rate information.
3. The transmission line status monitoring proxy device according to claim 2, wherein if RSRP, SINR and data transmission rate information are respectively smaller than corresponding judgment thresholds, the carrier aggregation radio frequency module is controlled to switch channels, and simultaneously a channel switching instruction is sent to an adjacent status monitoring proxy device.
4. The transmission line status monitoring agent device of claim 1, further comprising a multi-mode communication terminal module, the multi-mode communication terminal module being coupled to the data exchange module.
5. The transmission line status monitoring agent device according to claim 4, further comprising a power supply and a power management module, wherein the power supply is connected to the MCU, the data exchange unit, the first carrier aggregation radio frequency module and the second carrier aggregation radio frequency module respectively through the power management module.
6. The transmission line status monitoring agent device of claim 4, wherein the multi-mode communication terminal module comprises a 2G terminal module, a 3G terminal module, and/or a 4G terminal module.
7. The transmission line status monitoring agent device according to any one of claims 1 to 6, wherein each carrier aggregation radio frequency module aggregates frequency bands of 2.4GHz and 5.8 GHz.
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| CN105915454A (en) * | 2016-03-14 | 2016-08-31 | 国网江苏省电力公司南京供电公司 | Multimode communication method for state monitoring of power transmission line |
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