CN107682756B - LoRa-based power distribution terminal communication system - Google Patents
LoRa-based power distribution terminal communication system Download PDFInfo
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- CN107682756B CN107682756B CN201711076022.6A CN201711076022A CN107682756B CN 107682756 B CN107682756 B CN 107682756B CN 201711076022 A CN201711076022 A CN 201711076022A CN 107682756 B CN107682756 B CN 107682756B
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- 238000004891 communication Methods 0.000 title claims abstract description 26
- 230000005540 biological transmission Effects 0.000 claims abstract description 25
- 238000001914 filtration Methods 0.000 claims description 25
- 230000000087 stabilizing effect Effects 0.000 claims description 21
- 230000005611 electricity Effects 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 238000002955 isolation Methods 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 238000012544 monitoring process Methods 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 13
- 238000005265 energy consumption Methods 0.000 abstract description 7
- 238000010276 construction Methods 0.000 abstract description 3
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- 238000010586 diagram Methods 0.000 description 6
- 239000004973 liquid crystal related substance Substances 0.000 description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- H02J13/0079—
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2209/00—Arrangements in telecontrol or telemetry systems
- H04Q2209/40—Arrangements in telecontrol or telemetry systems using a wireless architecture
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2209/00—Arrangements in telecontrol or telemetry systems
- H04Q2209/80—Arrangements in the sub-station, i.e. sensing device
- H04Q2209/84—Measuring functions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
Abstract
The invention discloses a distribution terminal communication system based on LoRa, which relates to the technical field of distribution network communication and aims at solving the technical problems that the existing distribution network adopts the characteristics of low energy consumption, long transmission distance, no base station support and the like which are unique to the LoRa technology, and the existing distribution network adopts the characteristics of acquiring energy consumption from solar energy, wind energy, voltage transformers and field inspection equipment and automatically adjusting the working mode to adapt energy consumption due to the fact that the existing distribution network adopts wireless communication, and the technical problems that the existing distribution network is high in construction cost because of the fact that communication support is required to be provided by most of infrastructure.
Description
Technical Field
The invention relates to the technical field of power distribution network communication, in particular to a distribution terminal communication system based on LoRa.
Background
Distribution automation is a concept proposed in the 70 s of developed western countries, and is fully developed in japan and europe. There have also been many attempts at home, but focus mainly on cities. The power distribution automation organically integrates the monitoring, protection, control, metering and work management of power supply departments of the power distribution network under normal and accident conditions, improves the power supply quality, establishes closer and more responsible relation with users, meets the diversity of the user requirements with reasonable price, and strives for the best power supply economy.
At present, most distribution network automation systems can also play a role in monitoring the running condition of the distribution network and remotely controlling the change of the running mode when the distribution network normally runs, and faults can be timely detected, however, at present, distribution automation of a power system mainly depends on a public network to carry out uplink transmission of telemetry data, and in remote suburban areas, because of poor network of the public network and even no public network signal, the telemetry data of the distribution automation are not uploaded to a master station, and a distribution automation terminal is in an unsupervised state and cannot know the working information of a distribution line even.
For the places without public network or public network signal difference, three solutions are generally available, namely a wireless ad hoc network, a microwave station and an optical fiber. In the field of power dispatching, microwave stations and optical fibers are commonly adopted due to high requirements on instantaneity, reliability and safety, but the two modes belong to high investment and high cost. In the field of power distribution automation, the requirements on real-time performance, reliability and safety are relatively low, the nodes of the power distribution automation are very many and are sensitive to cost, and therefore a wireless communication mode is widely applied.
The existing wireless autonomous network modes comprise WIFI, bluetooth, GPRS, 3G and 4G, the WIFI transmission rate is high, but the transmission distance is short, and the power consumption is high; the Bluetooth transmission rate is high, the power consumption is low, but the transmission distance is short; GPRS coverage is large but requires infrastructure dependent construction; the 3G, 4G transmission rates are high, but also depend on infrastructure construction and require dense base station support.
The wireless technologies forming the local area network mainly comprise WiFi, bluetooth, zigbee and the like with the frequency of 2.4GHz, and the wireless technologies forming the wide area network mainly comprise 2G/3G/4G and the like. These wireless technologies have significant advantages and disadvantages, and before low power wide area networks (Low Power Wide Area Network, LPWAN) are created, it appears that the two technologies can be selected from the group consisting of long range and low power; when the LPWAN technology is adopted, a designer can achieve the compatibility of the LPWAN technology and the LPWAN technology, the longer-distance communication and the lower power consumption are realized to the greatest extent, and meanwhile, the cost of an additional repeater can be saved.
LoRa is one of LPWAN communication technologies, and is an ultra-long-distance wireless transmission scheme based on spread spectrum technology adopted and promoted by Semtech company in the United states. The scheme changes the prior compromise mode about transmission distance and power consumption, provides a simple system which can realize long distance, long battery life and large capacity for users, and further expands the sensing network. Currently, loRa operates mainly in the global free frequency band, including 433, 868, 915 MHz, etc. The LoRa technology has the characteristics of long distance, low power consumption (long battery life), multiple nodes and low cost.
Disclosure of Invention
The invention provides a distribution terminal communication system based on LoRa, which is used for solving the technical problems that the transmission power consumption, transmission rate, transmission data quantity and transmission distance cannot be well matched in the existing distribution network adopting wireless communication, and the construction cost is high because of the fact that most of distribution terminals need to rely on infrastructure to provide communication support.
In order to solve the problems, the invention adopts the following technical scheme:
the power distribution terminal communication system based on LoRa comprises a data acquisition device, a data concentrator, a network server and a monitoring terminal, wherein the data acquisition device is connected with the data concentrator in a wireless mode, the data concentrator is connected with the network server through a network, and the network server is connected with the monitoring terminal;
the data acquisition device at least comprises 1 data acquisition device;
the data acquisition device comprises a LoRa terminal main control module, a parameter input control module, a data acquisition interface module, an electricity taking module and a data receiving and transmitting module, wherein a first interface of the LoRa terminal main control module is connected with the parameter input control module, a second interface of the LoRa terminal main control module is connected with the data acquisition interface module, a third interface of the LoRa terminal main control module is connected with the electricity taking module, and a fourth interface of the LoRa terminal main control module is connected with the data receiving and transmitting module;
the LoRa terminal main control module comprises a microcomputer controller and a LoRa wireless transmission unit, and is used for receiving and processing the information transmitted by the data acquisition interface module and then transmitting the information to the data concentrator through the data transceiver module;
the parameter input control module comprises a key unit and a display unit, and is used for inputting control instructions to the LoRa terminal main control module;
the data acquisition interface module is used for connecting with various detection devices on site and acquiring detection data;
the data transceiver module comprises a transmitting antenna for transmitting data to the data concentrator through radio waves;
the electricity taking module comprises a transformer unit, a lightning protection isolation filtering unit, a first rectification voltage stabilizing unit, a channel switching unit, a solar panel unit, a second rectification unit, a wind driven generator unit, a lightning protection unit and a rectification filtering voltage stabilizing unit, wherein the transformer unit is connected with the incoming line end of the lightning protection isolation filtering unit, the outgoing line end of the lightning protection isolation filtering unit is connected with the incoming line end of the first rectification voltage stabilizing unit, and the outgoing line end of the first rectification voltage stabilizing unit is connected with the second interface of the channel switching unit; the solar panel unit is connected with the inlet end of the second rectifying unit, and the outlet end of the second rectifying unit is connected with the third interface of the channel switching unit; the wind energy generator unit is connected with the incoming line end of the lightning protection unit, the outgoing line end of the lightning protection unit is connected with the incoming line end of the rectifying, filtering and voltage stabilizing unit, and the outgoing line end of the rectifying, filtering and voltage stabilizing unit is connected with the fourth interface of the channel switching unit; the first interface of the channel switching unit is connected with a third interface of the LoRa terminal main control module;
the channel switching unit comprises a peak-to-peak value detection unit and an IGBT conducting pipe and is used for detecting and switching a power supply loop connected with the LoRa terminal main control module.
Preferably, the wireless mode is a LoRa wireless transmission mode.
Preferably, the network is an ethernet or a 3G, 4G network.
Preferably, the data acquisition interface module adopts 485 protocol transmission.
Preferably, the transformer unit is composed of at least one voltage transformer, and is used for acquiring electric energy from a detected circuit and providing the electric energy to the data acquisition device;
the lightning protection isolation filtering unit comprises a lightning protection device and a filtering capacitor, and is used for carrying out lightning protection and filtering treatment on electricity sent by the transformer unit;
preferably, the solar panel unit is mainly composed of solar panels.
Preferably, the data concentrator includes a data transceiver module, configured to receive data sent by the data acquisition device and send the data to a network server through a network.
Preferably, the data acquisition device modulates the signal before transmitting the data to the data concentrator, and the modulating step includes:
s1, producing a variable frequency sine wave;
s2, setting a conversion range of the sine wave according to the code rate parameter of the parameter input module;
s3, the frequency of the sine wave is determined according to the input data: when the data is 1, the sine wave changes from low frequency to high frequency, and when the data is 0, the sine wave changes from high frequency to low frequency; or alternatively, the process may be performed,
when the data is 0, the sine wave changes from low frequency to high frequency, and when the data is 1, the sine wave changes from high frequency to low frequency; or alternatively, the process may be performed,
when the data is 1, the frequency of the sine wave is firstly changed to be high and then to be low, and when the data is 0, the frequency of the sine wave is firstly changed to be low and then to be high; or alternatively, the process may be performed,
when the data is 0, the frequency of the sine wave is firstly changed to be high and then to be low, and when the data is 1, the frequency of the sine wave is firstly changed to be low and then to be high; alternatively, when the data is 1, the sine wave frequency is transformed within the maximum setting range, and when the data is 0, the sine wave is transformed at half of the maximum setting range; or alternatively, the process may be performed,
when the data is 0, the sine wave frequency is converted in the maximum setting range, and when the data is 1, the sine wave frequency is converted in half of the maximum setting range.
Further, the step S2 of setting the conversion range of the sine wave according to the code rate parameter of the parameter input module includes:
when the code rate control is set to 125KHz, the conversion range of the sine wave is 125KHz;
when the code rate control is set to 250KHz, the conversion range of the sine wave is 250KHz;
when the code rate control is set to 500KHz, the conversion range of the sine wave is 500KHz.
The invention adopts the characteristics of low energy consumption, no need of base station support for transmission distance elements and the like which are unique to the LoRa technology, and can ensure the communication connection of the distribution network for a long time and high efficiency by acquiring energy from solar energy, wind energy, voltage transformers and field inspection equipment and automatically adjusting the working mode to adapt to the energy consumption.
Drawings
FIG. 1 is a block diagram of the overall architecture of an embodiment provided by the present invention;
FIG. 2 is a block diagram of a data acquisition device in accordance with an embodiment of the present invention;
fig. 3 is a block diagram of a power module according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 3 in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. The detailed description of the embodiments of the invention, generally described and illustrated in the figures herein, 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 those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a general structural block diagram of an embodiment provided by the invention, fig. 2 is a structural block diagram of a data acquisition device in the embodiment provided by the invention, and fig. 3 is a structural block diagram of a power taking module in the embodiment provided by the invention, as shown in fig. 1-3, a distribution terminal communication system based on LoRa comprises a data acquisition device, a data concentrator, a network server and a monitoring terminal, wherein the data acquisition device is connected with the data concentrator in a LoRa wireless transmission mode, the data concentrator is connected with the network server through an ethernet or a 3G and 4G network, and the network server is connected with the monitoring terminal;
the data acquisition device at least comprises 1, and the embodiment adopts 4 data acquisition devices which are respectively connected with devices for acquiring three-phase current and voltage of the overhead line;
the data acquisition device comprises a LoRa terminal main control module, a parameter input control module, a data acquisition interface module, an electricity taking module and a data receiving and transmitting module, wherein a first interface of the LoRa terminal main control module is connected with the parameter input control module, a second interface of the LoRa terminal main control module is connected with the data acquisition interface module, a third interface of the LoRa terminal main control module is connected with the electricity taking module, and a fourth interface of the LoRa terminal main control module is connected with the data receiving and transmitting module;
the LoRa terminal main control module comprises a microcomputer controller and a LoRa wireless transmission unit, and is used for receiving and processing the information transmitted by the data acquisition interface module and then transmitting the information to the data concentrator through the data transceiver module;
the parameter input control module comprises a key unit and a display unit, and is used for inputting control instructions to the LoRa terminal main control module;
the data acquisition interface module adopts 485 protocol transmission, including but not limited to FTU, RTU, TTU protocol connection, and is used for connecting with various detection devices on site and acquiring detection data;
the data transceiver module comprises a transmitting antenna for transmitting data to the data concentrator through radio waves;
the electricity taking module comprises a transformer unit, a lightning protection isolation filtering unit, a first rectification voltage stabilizing unit, a channel switching unit, a solar panel unit, a second rectification unit, a wind driven generator unit, a lightning protection unit and a rectification filtering voltage stabilizing unit, wherein the transformer unit is connected with the incoming line end of the lightning protection isolation filtering unit, the outgoing line end of the lightning protection isolation filtering unit is connected with the incoming line end of the first rectification voltage stabilizing unit, and the outgoing line end of the first rectification voltage stabilizing unit is connected with the second interface of the channel switching unit; the solar panel unit is connected with the inlet wire end of the second rectifying unit, and the outlet wire end of the second rectifying unit is connected with the third interface of the channel switching unit; the wind energy generator unit is connected with the incoming line end of the lightning protection unit, the outgoing line end of the lightning protection unit is connected with the incoming line end of the rectifying, filtering and voltage stabilizing unit, and the outgoing line end of the rectifying, filtering and voltage stabilizing unit is connected with the fourth interface of the channel switching unit; the first interface of the channel switching unit is connected with a third interface of the LoRa terminal main control module;
the channel switching unit comprises a peak-to-peak value detection unit and an IGBT conducting pipe and is used for detecting and switching a power supply loop connected with the LoRa terminal main control module;
wherein, the liquid crystal display device comprises a liquid crystal display device,
the transformer unit is composed of at least one voltage transformer and is used for acquiring electric energy from a detected circuit and providing the electric energy to the data acquisition device;
the lightning protection isolation filter unit comprises a lightning protection device and a filter capacitor, and is used for carrying out lightning protection and filter treatment on electricity sent by the transformer unit;
the solar panel unit mainly comprises solar panels;
the data concentrator comprises a data receiving and transmitting module which is used for receiving the data sent by the data acquisition device and sending the data to the network server through a network.
The power taking module mainly takes power from a circuit to supply power to the central control module, three power taking modes exist in the power taking device, one power taking mode is that power is taken from the data acquisition interface module, the other power taking mode is that power is taken from the voltage transformer and the solar battery, and the third power taking mode is that power is taken from the wind driven generator. When the voltage transformer is not erected on the line or the voltage transformer is inconvenient to install, the electricity taking module takes electricity from the solar battery or the wind driven generator. If the wind driven generator or the data acquisition interface module is damaged in overcast and rainy weather or solar cell panel for a long time, electricity is acquired from the wind driven generator or the data acquisition interface module, and meanwhile, a current electricity acquisition mode signal is sent to the main control module. When the voltage transformer exists outside, the electricity taking module is used for taking electricity from the voltage transformer, the electricity supply capacity of the master control module is stronger at the time, the master control module can work in the highest performance mode, and the information of the line acquisition interface is denser and uploaded more quickly.
The power taking module consists of a voltage transformer, a lightning protection isolation filtering module and a rectification voltage stabilizing module under the power taking condition of the voltage transformer, and consists of a peak-to-peak value detection unit, an IGBT conduction pipe, an automatic threshold setting module and a rectification voltage stabilizing module under the power taking condition of the data acquisition interface. The automatic threshold setting module automatically sets a threshold according to the peak value, and when the peak value is larger than the threshold, the automatic threshold setting module sends a driving signal to control the IGBT tube to be conducted, so that the electric energy of the data acquisition interface can flow out and enter the arrangement voltage stabilizing device to output electric energy to the main control module. The peak-to-peak detection module and the automatic threshold control module are relied on, so that the power taking operation is only performed when the voltage of the data acquisition interface is higher than the logic voltage which can be identified by the main control module, and the data acquisition interface and the main control module can not work normally when power is taken.
In order to ensure the high efficiency and accuracy of data transmission, the data acquisition device modulates the signals before transmitting the data to the data concentrator, and the modulation method is as follows: 1. producing a sine wave of one frequency; 2. setting a conversion range of the sine wave according to the code rate parameter of the parameter input module, wherein the conversion range of the sine wave is 125KHz if the code rate control is set to 125KHz, the conversion range of the sine wave is 250KHz if the code rate control is set to 250KHz, and the conversion range of the sine wave is 500KHz if the code rate control is set to 500KHz; 3. the frequency change law of the sine wave is different according to the input data, including but not limited to a down-conversion method: when the data is 1, the sine wave changes from low frequency to high frequency, and when the data is 0, the sine wave changes from high frequency to low frequency; or when the data is 0, the sine wave changes from low frequency to high frequency, and when the data is 1, the sine wave changes from high frequency to low frequency; or when the data is 1, the frequency of the sine wave becomes higher and lower, and when the data is 0, the frequency of the sine wave becomes lower and higher; or when the data is 0, the frequency of the sine wave becomes higher and lower, and when the data is 1, the frequency of the sine wave becomes lower and higher; or when the data is 1, the sine wave frequency is transformed within the maximum setting range, and when the data is 0, the sine wave is transformed in half of the maximum setting range; or when the data is 0, the sine wave frequency is changed within the maximum setting range, and when the data is 1, the sine wave is changed at half of the maximum setting range.
The invention adopts the characteristics of low energy consumption, no need of base station support for transmission distance elements and the like which are unique to the LoRa technology, and can ensure the communication connection of the distribution network for a long time and high efficiency by acquiring energy from solar energy, wind energy, voltage transformers and field inspection equipment and automatically adjusting the working mode to adapt to the energy consumption.
Claims (8)
1. Distribution terminal communication system based on loRa, its characterized in that:
the system comprises a data acquisition device, a data concentrator, a network server and a monitoring terminal, wherein the data acquisition device is connected with the data concentrator in a wireless mode, the data concentrator is connected with the network server through a network, and the network server is connected with the monitoring terminal;
the data acquisition device at least comprises 1 data acquisition device;
the data acquisition device comprises a LoRa terminal main control module, a parameter input control module, a data acquisition interface module, an electricity taking module and a data receiving and transmitting module, wherein a first interface of the LoRa terminal main control module is connected with the parameter input control module, a second interface of the LoRa terminal main control module is connected with the data acquisition interface module, a third interface of the LoRa terminal main control module is connected with the electricity taking module, and a fourth interface of the LoRa terminal main control module is connected with the data receiving and transmitting module;
the LoRa terminal main control module comprises a microcomputer controller and a LoRa wireless transmission unit, and is used for receiving and processing the information transmitted by the data acquisition interface module and then transmitting the information to the data concentrator through the data transceiver module;
the parameter input control module comprises a key unit and a display unit, and is used for inputting control instructions to the LoRa terminal main control module;
the data acquisition interface module is used for connecting with various detection devices on site and acquiring detection data;
the data transceiver module comprises a transmitting antenna for transmitting data to the data concentrator through radio waves;
the electricity taking module comprises a transformer unit, a lightning protection isolation filtering unit, a first rectification voltage stabilizing unit, a channel switching unit, a solar panel unit, a second rectification unit, a wind driven generator unit, a lightning protection unit and a rectification filtering voltage stabilizing unit, wherein the transformer unit is connected with the incoming line end of the lightning protection isolation filtering unit, the outgoing line end of the lightning protection isolation filtering unit is connected with the incoming line end of the first rectification voltage stabilizing unit, and the outgoing line end of the first rectification voltage stabilizing unit is connected with the second interface of the channel switching unit; the solar panel unit is connected with the inlet end of the second rectifying unit, and the outlet end of the second rectifying unit is connected with the third interface of the channel switching unit; the wind energy generator unit is connected with the incoming line end of the lightning protection unit, the outgoing line end of the lightning protection unit is connected with the incoming line end of the rectifying, filtering and voltage stabilizing unit, and the outgoing line end of the rectifying, filtering and voltage stabilizing unit is connected with the fourth interface of the channel switching unit; the first interface of the channel switching unit is connected with a third interface of the LoRa terminal main control module;
the mutual inductor unit is composed of at least one voltage mutual inductor and is used for acquiring electric energy from a detected circuit and providing the electric energy to the data acquisition device;
the lightning protection isolation filtering unit comprises a lightning protection device and a filtering capacitor, and is used for carrying out lightning protection and filtering treatment on electricity sent by the transformer unit;
the channel switching unit comprises a peak-to-peak value detection unit and an IGBT conducting pipe and is used for detecting and switching a power supply loop connected with the LoRa terminal main control module.
2. The power distribution terminal communication system of claim 1, wherein:
the wireless mode is a LoRa wireless transmission mode.
3. The power distribution terminal communication system of claim 1, wherein:
the network is an Ethernet network or a 3G, 4G network.
4. The power distribution terminal communication system of claim 1, wherein:
the data acquisition interface module adopts 485 protocol transmission.
5. The power distribution terminal communication system of claim 1, wherein:
the solar cell panel unit is mainly composed of solar cell panels.
6. The power distribution terminal communication system of claim 1, wherein:
the data concentrator comprises a data receiving and transmitting module which is used for receiving the data sent by the data acquisition device and sending the data to the network server through a network.
7. The power distribution terminal communication system of claim 6, wherein:
the data acquisition device modulates the signals before transmitting the data to the data concentrator, and the modulating step comprises the following steps:
s1, producing a variable frequency sine wave;
s2, setting a conversion range of the sine wave according to the code rate parameter of the parameter input module;
s3, the frequency of the sine wave is determined according to the input data: when the data is 1, the sine wave changes from low frequency to high frequency, and when the data is 0, the sine wave changes from high frequency to low frequency; or alternatively, the process may be performed,
when the data is 0, the sine wave changes from low frequency to high frequency, and when the data is 1, the sine wave changes from high frequency to low frequency; or alternatively, the process may be performed,
when the data is 1, the frequency of the sine wave is firstly changed to be high and then to be low, and when the data is 0, the frequency of the sine wave is firstly changed to be low and then to be high; or alternatively, the process may be performed,
when the data is 0, the frequency of the sine wave is firstly changed to be high and then to be low, and when the data is 1, the frequency of the sine wave is firstly changed to be low and then to be high; alternatively, when the data is 1, the sine wave frequency is transformed within the maximum setting range, and when the data is 0, the sine wave is transformed at half of the maximum setting range; or alternatively, the process may be performed,
when the data is 0, the sine wave frequency is converted in the maximum setting range, and when the data is 1, the sine wave frequency is converted in half of the maximum setting range.
8. The power distribution terminal communication system of claim 7, wherein:
step S2 is to set a conversion range of the sine wave according to the code rate parameters of the parameter input module, wherein the conversion range comprises the following steps:
when the code rate control is set to 125KHz, the conversion range of the sine wave is 125KHz;
when the code rate control is set to 250KHz, the conversion range of the sine wave is 250KHz;
when the code rate control is set to 500KHz, the conversion range of the sine wave is 500KHz.
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| CN109617217A (en) * | 2019-01-09 | 2019-04-12 | 成都凯天电子股份有限公司 | Self-power wireless sensor |
| CN109714745B (en) * | 2019-03-13 | 2022-03-01 | 清华四川能源互联网研究院 | Transmission line monitoring data transmission system |
| CN110007636A (en) * | 2019-05-14 | 2019-07-12 | 张轩宁 | A kind of internet-of-things terminal based on power grid acquires equipment in real time |
| CN110572791B (en) * | 2019-09-02 | 2022-04-01 | 关祥 | Information transmission system based on LoRa technology |
| CN111093227B (en) * | 2019-12-30 | 2022-09-13 | 武汉阿迪克电子股份有限公司 | LoRaWAN-based wireless transmission data acquisition method and system |
| CN111243256A (en) * | 2020-03-24 | 2020-06-05 | 河南省中原智能电气科技有限公司 | Communication transmission module for low-voltage power distribution monitoring system |
| CN112422612B (en) * | 2020-09-15 | 2022-09-02 | 国网浙江省电力有限公司湖州供电公司 | Power distribution network monitoring data transmission system and method based on LORA wireless communication |
| CN113014895B (en) * | 2021-05-25 | 2021-08-31 | 广东信通通信有限公司 | Ad hoc network video system and ad hoc network video system control method |
| CN115190445A (en) * | 2022-09-09 | 2022-10-14 | 国网湖北省电力有限公司 | Method and system for monitoring real-time information of power gateway |
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