CN221127291U - DTU unit based on PLC communication technology - Google Patents
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Abstract
The utility model relates to the technical field of photovoltaic power generation and discloses a DTU unit based on a PLC communication technology, which comprises a power supply module, a PLC driving module, a PLC main control and driving chip, an external memory, a touch detection module, an LED indication module and a WiFi communication module; according to the utility model, the DTU unit is used as a bridge to realize communication between the cloud platform and the inverter, the cloud platform can analyze big data transmitted by the power station in the background without training a large number of after-sales technicians, and the server analyzes and positions the reasons of the problems and gives out a simple proposal solution through the data uploaded by the DTU unit, so that the maintenance of the power station is more convenient, the power generation efficiency of the power station can be controlled, and the power generation of the power station is maximized.
Description
Technical Field
The utility model belongs to the technical field of photovoltaic power generation, and particularly relates to a DTU unit based on a PLC communication technology.
Background
In recent years, with the huge photovoltaic stock market and rapid iteration, the system efficiency, the reduced system cost and the rapid progress of technology are realized. In particular, the hidden value of the stock power station is increasing after the photovoltaic industry realizes the low-price internet surfing. The photovoltaic power station technical improvement mainly fuses the new material, new technology and photovoltaic power generation industry through the Internet of things, cloud computing, big data, artificial intelligence, and the depth of the new material, and changes the power station with low performance index into a novel intelligent photovoltaic power station, thereby realizing the intellectualization of the old power station. The use of green clean energy sources such as photovoltaic power stations is actively advocated by the nation, and currently, the operation and maintenance service in the industry is focused on operation monitoring, fault detection and equipment maintenance management within 5 years after grid connection of the photovoltaic power stations. The high-quality and high-efficiency operation and maintenance service should run through the whole life cycle of the photovoltaic power station, so that the power generation efficiency of the photovoltaic power station is maximized.
The number of power stations at home and abroad is numerous, but the daily operation and maintenance work is more traditional, the following problems are commonly existed: the labor cost is high: manual inspection, paper recording and telephone communication lack of intelligent means; the working efficiency is low: the inspection frequency is low, the inspection task cannot be positioned, the inspection process is not standard and standard, and the inspection defect lacks closed loop tracking; potential safety hazard: some electricity units have no professional maintenance, and cannot immediately check electric hidden dangers, hidden engineering hidden dangers, and the like; the rush repair time is long: the power substation equipment has more types and is distributed more and more scattered, fault information cannot be recognized and positioned immediately, and a user is required to confirm the fault information on site after notifying the fault information; run big data lack analysis: some users do not have a data summarizing and analyzing platform, even the operation and maintenance personnel do not know the on-site power parameter information because of not installing a power meter, and whether the power system operates normally cannot be determined.
The scheme for solving the problems is that the centralized summarization of mass data of the photovoltaic power station is realized by adopting a DTU technology, DTU (DataTranslate Unit) means that local serial data is transmitted in a wireless long distance by utilizing a WIFI network, and the local serial data is interacted with a remote public network server, and the scheme is mainly used for remote data acquisition and remote control projects so as to realize remote intelligent monitoring operation and maintenance of the power station.
For the problems in the related art, no effective solution has been proposed at present.
Disclosure of utility model
Aiming at the problems in the related art, the utility model provides a DTU unit based on a PLC communication technology, so as to overcome the technical problems existing in the prior related art.
In order to solve the technical problems, the utility model is realized by the following technical scheme:
The utility model relates to a DTU unit based on PLC communication technology, comprising: the touch detection device comprises a power supply module, a PLC driving module, a PLC main control and driving chip, an external memory, a touch detection module, an LED indication module and a WiFi communication module; the power module and the PLC driving module share the same power supply interface and are connected with a power grid; the power supply module is used for rectifying and transforming the electric energy input from the power supply interface and outputting power supply voltage for power supply; the PLC driving module is communicated with the inverter through a power supply interface and a power carrier of a power grid; the PLC driving module and the PLC main control and driving chip establish data connection through serial communication, and the PLC main control and driving chip and the WiFi communication module establish data connection through serial communication; the PLC main control and driving chip and the external memory are connected through a full duplex synchronous serial bus; the PLC main control and driving chip is connected with the touch detection module through a general input/output port, and the PLC main control and driving chip is connected with the LED indication module through a general input/output port.
Preferably, a built-in protocol stack unit, a built-in storage unit and an RTC clock unit are arranged in the PLC main control and driving chip; the RTC clock unit is used for providing accurate time for the PLC main control and driving chip to execute the built-in executable program, the built-in protocol stack unit is used for performing bidirectional conversion on data transmitted by serial communication, and the built-in storage unit is used for storing the executable program.
Preferably, the built-in protocol stack unit stores a communication protocol therein, and is configured to convert data transmitted through serial communication into data conforming to the communication protocol, and is further configured to convert the data conforming to the communication protocol into serial data.
Preferably, a permanent online unit is further arranged in the PLC main control and driving chip, the permanent online unit is used for executing startup automatic dialing, and the permanent online unit can also output a heartbeat packet to keep the permanent online of the DTU unit.
Preferably, the WiFi communication module is configured to establish wireless communication with the cloud platform, and upload the operation information data to the cloud platform in real time.
Preferably, the power supply module comprises a rectifier bridge, a flyback voltage-changing unit and an LDO voltage stabilizer, wherein the power grid voltage sequentially passes through the rectifier bridge and the flyback voltage-changing unit to output 5V voltage, and the power grid voltage sequentially passes through the rectifier bridge, the flyback voltage-changing unit and the LDO voltage stabilizer to output 3.3V voltage.
Preferably, the touch detection module is configured as a scram control switch, and when the touch detection module detects a touch operation, the touch detection module sends a scram signal to the PLC master control and driving chip to shut down all inverters in the power station.
Preferably, the LED indication module includes an emergency stop status indicator lamp, a network status indicator lamp and an operation status indicator lamp, where the LED indication module is controlled by signals transmitted by the PLC master control and the driving chip to turn on and off the emergency stop status indicator lamp, the network status indicator lamp and the operation status indicator lamp respectively.
The utility model has the following beneficial effects:
1. the DTU unit is used as a bridge, so that communication between the cloud platform and the inverter is realized, the cloud platform can analyze big data transmitted by the power station in the background, a large number of after-sales technicians do not need to be trained, the data uploaded by the DTU unit are analyzed and positioned by the server to cause problems, a simple proposal solution is given, the maintenance of the power station is more convenient, the power station power generation efficiency can be controlled, and the power station power generation is maximized.
2. The WiFi communication module is in communication connection with the cloud platform, and is wide in radio wave coverage range and suitable for being used in unit floors and offices; the WiFi communication does not need wiring, can be not limited by wiring conditions, is suitable for the requirements of mobile office users, and has wide market prospect; the emission power set by IEEE802.11 in WiFi communication can not exceed 100 milliwatts, so that the radiation to human bodies is small, and the safety is high.
3. The WiFi communication module is adopted for networking, the networking is rapid and flexible, the construction period is short, the cost is low, and the network coverage is wide; the permanent online unit is adopted to ensure that the link is always online, the built-in protocol stack unit stores various protocols, and meanwhile, various interfaces and various protocols are supported, so that the project application is more convenient.
Of course, it is not necessary for any one product to practice the utility model to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings that are needed for the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the structure of a DTU unit according to the present utility model;
Fig. 2 is a schematic diagram of an application scenario of a DTU unit in a home power station based on a PLC communication technology according to the present utility model.
Detailed Description
The following description of the technical solutions in the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, based on the embodiments in the utility model, which a person of ordinary skill in the art would obtain without inventive faculty, are within the scope of the utility model.
In the description of the present utility model, it should be understood that the terms "open," "upper," "lower," "top," "middle," "inner," and the like indicate an orientation or positional relationship, merely for convenience of description and to simplify the description, and do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model.
Embodiment one:
Referring to fig. 1, the present utility model is a DTU unit based on PLC communication technology, including: the touch detection device comprises a power supply module, a PLC driving module, a PLC main control and driving chip, an external memory, a touch detection module, an LED indication module and a WiFi communication module; the power module and the PLC driving module share the same power supply interface and are connected with a power grid; the power supply module is used for rectifying and transforming the electric energy input from the power supply interface and outputting a power supply voltage for power supply; the PLC driving module is communicated with the inverter through a power carrier of a power grid through a power supply interface; the data connection is established between the PLC driving module and the PLC main control and driving chip through serial port communication (the serial port communication in the embodiment adopts a universal asynchronous receiving and transmitting Transmitter Universal Asynchronous Receiver/Transmitter, which is generally called UART for short, the universal asynchronous receiver is a universal serial data bus for asynchronous communication, the data is transmitted and converted between serial communication and parallel communication, the bus is in bidirectional communication, and full duplex transmission and reception can be realized), and the data connection is established between the PLC main control and driving chip and the WiFi communication module through serial port communication; the PLC master control and driving chip and the external memory are connected through a full duplex synchronous serial bus (the full duplex synchronous serial bus SPI is a full duplex synchronous serial bus developed by Motorola corporation, is a synchronous serial port for communication between the microprocessing control unit MCU and the peripheral equipment, and in an embedded system, the UART can be used for communication with the PC, including communication with a monitoring debugger and other devices such as EEPROM); the PLC main control and driving chip and the touch detection module are connected through General-purpose input/output ports (GPIO, general-purpose input/output ports), the function is similar to P0-P3 of 8051, PINs of the PLC main control and driving chip can be used by a user freely through program control, the PIN PINs can be used as General-purpose input GPIs or General-purpose output GPOs or General-purpose input and output GPIOs according to practical considerations, and the PLC main control and driving chip and the LED indication module are connected through the General-purpose input/output ports.
In actual use, the PLC master control and driving chip selects a Haishu Hi3921SV100 chip, the operating voltage of the Hi3921SV100 chip is 3.0V-3.6V, the operating temperature is-40 ℃ to +85 ℃, the high-speed/low-speed multimode power line carrier communication modem and the high-performance application processing core are integrated, automatic quick networking and dynamic routing are supported, multipath addressing is supported, and the Hi3921SV100 chip integrates power line carrier communication; supporting automatic and rapid networking, wherein the number of child nodes is more than or equal to 40; the communication distance between the father node and the child node is more than or equal to 100 meters;
The WiFi communication module selects Lexin ESP-WROOM-02D and ESP-WROOM-02D with working voltage of 2.7V-3.6V and working temperature of-40 ℃ to +85 ℃, the RF authentication comprises FCC/CE (RED)/TELEC (MIC)/KCC/SRRC/IC/NCC, ESP-WROOM-02D, and the WiFi protocol supports 802.11b/g/n with frequency range of 2.4 GHz-2.5 GHz; wireless network mode support
Station/softAP/softAP+station; the user configuration supports an Android/iOS app configuration network; the built-in on-board antenna and the IPEX antenna are optional and are compatible in pins;
The external memory (NAND FLASH) selects Raulomb CSNP1GCR01-AOW, CSNP1GCR01-AOW memory capacity is 128Mbytes, working voltage is 2.7V-3.6V, working temperature is-40 ℃ to +85 ℃, crc redundancy check and bad block management are carried out, and the memory capacity is satisfied for power-down nonvolatile memory: 5 PS stations are stored for 5 minutes at intervals, and can retain operation information data more than or equal to 7 days;
When the DTU unit based on the PLC communication technology is used, the power supply module is connected with a power grid through a power supply interface, the power supply module acquires electric energy from the power grid, rectifies and transforms current input by the power grid, outputs power supply voltage to supply power to each electric appliance (each power utilization module, unit and the like) of the DTU unit based on the PLC communication technology, and the PLC driving module is communicated with the inverter through a power carrier in the power grid through a power supply interface shared by the common power supply module; the PLC driving module and the PLC main control and driving chip establish data connection through UART serial communication, the PLC main control and driving chip and the WiFi communication module establish data connection through UART serial communication, so that the PLC main control and driving chip processes data transmitted by a power carrier, the processed data is transmitted to the cloud platform through the WiFi communication module, and control/adjustment commands issued by the cloud platform can also be preprocessed through the UART serial communication by the PLC main control and driving chip and then transmitted to an inverter in a power grid through the PLC driving module; the external memories of the PLC main control and the driving chip are connected through the SPI full duplex synchronous serial bus, and data transmitted and processed by the PLC main control and the driving chip are input into the external memories for storage, so that the safety of the data and the long-time storage of the data are ensured; the PLC main control and driving chip establishes data connection with the touch detection module and the LED indication module through the general purpose input/output port GPIO, data can be transmitted in two directions, control information detected by the touch detection module is transmitted to the PLC main control and driving chip, and indication information of the control LED indication module of the PLC main control and driving chip can also be transmitted to the LED indication module.
The DTU unit based on the PLC communication technology can be inserted in the design and construction stage of a power station, and an optimization suggestion and a deep power station physical examination after grid connection are proposed for the construction of the power station by depending on a complete 'post-power-station evaluation system' during the construction of a power station in the earlier stage; during the operation of the later-stage power station, the power station is subjected to omnibearing, fine, digital and intelligent management by various operation and maintenance means such as system efficiency test, individualized power station evaluation report issuing, production management platform remote big data monitoring, periodic inspection and cleaning, equipment state evaluation and maintenance and the like. The DTU transmission power station data based on the wifi technology, which is related to the DTU unit based on the PLC communication technology, is monitored and analyzed by the cloud platform, so that the power generation benefit of the power station is maximized. Most importantly, the data uploaded through the DTU is analyzed by the server to locate the cause of the problem and to suggest a solution without the need to train a large number of after-market technicians.
Preferably, a built-in protocol stack unit, a built-in storage unit and an RTC clock unit are arranged in the PLC main control and driving chip; the RTC clock unit (the RTC clock unit is preferably a real-time network clock, the running information data of the RTC clock unit needs to contain a time stamp, under the condition that the network is normal, the gateway can be connected with the cloud platform for clock calibration) is used for providing accurate time for the PLC main control and the driving chip to execute the built-in executable program, the built-in protocol stack unit is used for carrying out bidirectional conversion on the data transmitted by serial port communication, and the built-in storage unit is used for storing the executable program.
The built-in storage unit is provided with parameters of an executable program or burns the executable program, the built-in storage unit adopts permanent storage equipment such as FLASH or EEPROM, in different application scenes, the IP address, the port number and the baud rate of a serial port of the data center are different, and the burnt executable program is matched with different application scenes, so that the PLC main control and driving chip can automatically work according to the set parameters; the real-time timing of the RTC clock unit can accurately match the time of the operation data, and the operation record of the inverter in the operation process of the power grid can be more accurately positioned.
Preferably, the built-in protocol stack unit stores a communication protocol therein, and is used for converting data transmitted through serial communication into data conforming to the communication protocol, and is also used for converting the data conforming to the communication protocol into serial data.
When in actual use, one or more combinations of PPP protocol, TCP/IP protocol, UDP/IP protocol, HTTP protocol, MODBUS-TCP protocol and MODBUS-RTU protocol are stored in the built-in protocol stack unit; the TCP/IP protocol stack is exemplified by a TCP/IP protocol stack, which can be understood as the combination of a wireless modem and an embedded PC, so that the DTU has dial-up networking and TCP/IP data communication functions, and a built-in protocol stack unit is arranged inside the DTU unit; the serial data comprises any one or more of RS232, RS485 and RS 422.
Preferably, the PLC main control and driving chip is internally provided with a permanent online unit, the permanent online unit is used for executing startup automatic dialing, and the permanent online unit can also output a heartbeat packet to keep the permanent online of the DTU unit.
Where a heartbeat packet is typically a packet of data sent by a client to a server every small period of time, informing the server that itself is still online, and transmitting some data that may be necessary. The permanent online unit performs power-on auto-dialing and outputs heartbeat packets to keep the DTU unit permanently online.
Preferably, the WiFi communication module is configured to establish wireless communication with the cloud platform, and upload the operation information data to the cloud platform in real time.
When the DTU unit based on the PLC communication technology is used, communication connection is established between the WiFi communication module and the cloud platform, the WiFi communication module has wide radio wave coverage range, the WiFi radius is 100 meters, the DTU unit is suitable for being applied to unit floors and offices, and the coverage range of the DTU unit is far beyond that of 15 meters covered by the Bluetooth technology; the WiFi communication does not need wiring, can be not limited by wiring conditions, is suitable for the requirements of mobile office users, and has wide market prospect; the emission power set by IEEE802.11 in WiFi communication can not exceed 100 milliwatts, the actual emission power is about 60-70 milliwatts, the wireless network is not in direct contact with human body like a mobile phone, the radiation to human body is small, and the safety is high.
Preferably, the power supply module comprises a rectifier bridge, a flyback voltage-converting unit (flyback transformer) and an LDO voltage stabilizer (low dropout regulator, low-dropout linear voltage stabilizer), wherein the power grid voltage sequentially outputs 5V voltage through the rectifier bridge and the flyback voltage-converting unit, and the power grid voltage sequentially outputs 3.3V voltage through the rectifier bridge, the flyback voltage-converting unit and the LDO voltage stabilizer.
Preferably, the touch detection module is configured as a scram control switch, and when the touch detection module detects a touch operation, the touch detection module sends a scram signal to the PLC master control and driving chip to shut down all inverters in the power station.
Preferably, the LED indicating module comprises an emergency stop state indicating lamp, a network state indicating lamp and an operation state indicating lamp, and the LED indicating module is controlled by signals transmitted by the PLC main control and driving chip to turn on and off the emergency stop state indicating lamp, the network state indicating lamp and the operation state indicating lamp respectively.
Embodiment two:
Referring to fig. 2 (application scenario of a household power station formed by a DTU unit auxiliary inverter PS, a gateway, and a cloud platform), in practical use, a DTU unit based on a PLC communication technology in the first embodiment is configured in the household power station, through the DTU unit based on the PLC communication technology, inverter operation information and generating capacity statistics data obtained from a power carrier in a power grid are uploaded to a cloud platform by the DTU unit, a user can log in the cloud platform through a computer PC and a mobile phone APP, check the inverter operation information and generating capacity statistics, and the like, and can also remotely operate the inverter, including parameter setting, forced shutdown, upgrading firmware, and the like, the remote operation is input into a PLC master control and driving chip for execution or storage, wherein the DTU unit is used as a bridge to realize communication between the cloud platform and the inverter, the cloud platform can analyze big data transmitted by the power station in the background, without training a large number of after-sales technicians, and the data uploaded by the DTU unit is analyzed by a server to provide a simple proposal solution, so that the power station maintenance is more convenient and the power station can control the generating efficiency and maximize the power generation efficiency.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above disclosed preferred embodiments of the utility model are merely intended to help illustrate the utility model. The preferred embodiments are not exhaustive or to limit the utility model to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best understand and utilize the utility model.
Claims (8)
1. A DTU unit based on PLC communication technology, comprising: the touch detection device comprises a power supply module, a PLC driving module, a PLC main control and driving chip, an external memory, a touch detection module, an LED indication module and a WiFi communication module;
The power module and the PLC driving module share the same power supply interface and are connected with a power grid;
the power supply module is used for rectifying and transforming the electric energy input from the power supply interface and outputting power supply voltage for power supply;
The PLC driving module is communicated with the inverter through a power supply interface and a power carrier of a power grid;
the PLC driving module and the PLC main control and driving chip establish data connection through serial communication, and the PLC main control and driving chip and the WiFi communication module establish data connection through serial communication;
the PLC main control and driving chip and the external memory are connected through a full duplex synchronous serial bus;
The PLC main control and driving chip is connected with the touch detection module through a general input/output port, and the PLC main control and driving chip is connected with the LED indication module through a general input/output port.
2. The DTU unit based on PLC communication technology as recited in claim 1, wherein: the PLC main control and driving chip is internally provided with a built-in protocol stack unit, a built-in storage unit and an RTC clock unit;
The RTC clock unit is used for providing accurate time for the PLC main control and driving chip to execute the built-in executable program, the built-in protocol stack unit is used for performing bidirectional conversion on data transmitted by serial communication, and the built-in storage unit is used for storing the executable program.
3. The DTU unit based on PLC communication technology as recited in claim 2, wherein: the built-in protocol stack unit is internally stored with a communication protocol and is used for converting data transmitted through serial communication into data conforming to the communication protocol, and the built-in protocol stack unit is also used for converting the data conforming to the communication protocol into serial data.
4. A DTU unit based on PLC communication technology as claimed in claim 3, wherein: the PLC master control and driving chip is internally provided with a permanent online unit, the permanent online unit is used for executing startup automatic dialing, and the permanent online unit can also output a heartbeat packet to keep the permanent online of the DTU unit.
5. The DTU unit based on PLC communication technology as recited in claim 1, wherein: the WiFi communication module is used for establishing wireless communication with the cloud platform and uploading operation information data to the cloud platform in real time.
6. The DTU unit based on PLC communication technology as recited in claim 1, wherein: the power supply module comprises a rectifier bridge, a flyback voltage-changing unit and an LDO voltage stabilizer, wherein the power grid voltage sequentially passes through the rectifier bridge and the flyback voltage-changing unit to output 5V voltage, and the power grid voltage sequentially passes through the rectifier bridge, the flyback voltage-changing unit and the LDO voltage stabilizer to output 3.3V voltage.
7. The DTU unit based on PLC communication technology as recited in claim 1, wherein: the touch detection module is configured as a scram control switch, and when the touch detection module detects touch operation, the touch detection module sends a scram signal to the PLC main control and driving chip to shut down all inverters in the power station.
8. The DTU unit based on PLC communication technology as recited in claim 1, wherein: the LED indication module comprises an emergency stop state indication lamp, a network state indication lamp and an operation state indication lamp, and the LED indication module is controlled by signals transmitted by the PLC main control and driving chip to respectively turn on and off the emergency stop state indication lamp, the network state indication lamp and the operation state indication lamp.
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| CN202322962335.9U CN221127291U (en) | 2023-11-02 | 2023-11-02 | DTU unit based on PLC communication technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119766897A (en) * | 2024-12-24 | 2025-04-04 | 深圳市力合微电子股份有限公司 | Photovoltaic protocol converter based on power line carrier communication technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN119766897A (en) * | 2024-12-24 | 2025-04-04 | 深圳市力合微电子股份有限公司 | Photovoltaic protocol converter based on power line carrier communication technology |
| CN119766897B (en) * | 2024-12-24 | 2025-10-31 | 深圳市力合微电子股份有限公司 | A photovoltaic protocol converter based on power line carrier communication technology |
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