KR102069227B1 - Automatic searching method for unregistered communication protocol of inverter in solar power - Google Patents

Abstract

An electronic terminal unit is disclosed. This unit is a communication unit for communicating with the inverter device included in the solar system, a storage unit for storing the manufacturer-specific information of the inverter device, and when communicating with a specific inverter device, based on the manufacturer-specific information of the specific inverter device previously stored It may include a control module that recognizes a specific inverter device and the communication protocol of the specific inverter device, and communicates with the specific inverter device based on the recognized communication protocol. Thus, management of the solar system can be facilitated.

Description

AUTOMATIC SEARCHING METHOD FOR UNREGISTERED COMMUNICATION PROTOCOL OF INVERTER IN SOLAR POWER}

The present invention relates to a method for predicting a communication protocol of an inverter device provided in a photovoltaic power generation system.

The use of fossil fuel, which is a major energy source, causes side effects such as climate change, and the restriction on its use is intensifying. In recent years, renewable energy has been spotlighted due to the depletion of coal and oil. Accordingly, the importance of a renewable energy generation system capable of producing environmentally friendly power and supplying the generated power stably and efficiently is emerging.

Among them, the solar power generation system has an advantage of being able to freely determine the installation size as needed and the expansion of the installation is expanding in the current situation of diversification and decentralization of energy sources.

The photovoltaic system is an essential component of a photovoltaic module and an inverter device for converting direct current generated from the photovoltaic module. In general, one inverter device may control a plurality of photovoltaic modules. In large industrial installations, solar power systems use hundreds to as many as thousands of solar inverter devices. Accordingly, there is a growing interest in a method that can collectively manage and diagnose a large number of solar inverter devices.

The inverter device may include a communication module to transmit various information of the photovoltaic power generation system to an electronic terminal unit, which is a kind of an external remote terminal unit (RTU).

However, since many companies manufacture inverter devices, communication failures between the electronic terminal unit and the inverter device may occur due to differences in communication protocols according to manufacturers.

Accordingly, there is a need for a method in which an electronic terminal unit can communicate with an inverter device regardless of the manufacturer.

On the other hand, the above information is only presented as background information to help the understanding of the present invention. No determination is made as to whether any of the above is applicable as the prior art concerning the present invention, and no claims are made.

Publication No. 10-2004-0054216 (published date: 2004.6.25, application number: 10-2002-0081039, filing date: 2002.12.18)

The present invention has been made to solve the above-described problem, an embodiment according to the present invention proposes an electronic terminal unit (ETU) to stably communicate with the inverter device of the solar system, even if there is a difference in the manufacturer-specific communication protocol. .

One embodiment according to the present invention proposes a method of communicating with an inverter device even if the communication protocol is not known in detail.

Technical problems to be achieved in the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

A method for predicting a communication protocol of an inverter device included in a photovoltaic power generation system for realizing the above object may include receiving a frame of a Modbus communication protocol received from a specific inverter device; Determining a frame type of the modbus communication protocol based on information in a protocol identification field; And when the determined frame type of the Modbus communication protocol is TCP (Transmission Control Protocol), specifying a Function code field and a Data field based on the Length field, and the determined frame type of the Modbus communication protocol is set to TCP. If not, the method may include specifying a function code field and a data field based on the Addition address field.

More specifically, the method comprises the steps of monitoring values of the specified Fuction code field and the specified Data field; And predicting a data attribute of the value of the data field based on the value of the monitored data field.

More specifically, the predicting the data property may include predicting the value of the data field as the cumulative power amount when the value of the monitored data field is the largest among the collected values.

More specifically, the method includes requesting communication protocol information of the specific inverter device by accessing an inverter information database including communication protocol information of the specific inverter device; And when receiving communication protocol information of the specific inverter device, communicating with the specific inverter device based on the received communication protocol information.

According to various embodiments of the present invention, the following effects may be derived.

First, by providing an electronic terminal unit (ETU) which reliably communicates with an inverter device of a solar system, the risk of communication disturbances can be eliminated.

Secondly, stable communication with the inverter device can be ensured so that the photovoltaic power generation system can be more efficiently managed.

Effects obtained in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

1 and 2 illustrate a configuration of a transmission frame of a Modbus (ModBus) protocol according to an embodiment of the present invention.
3 is a block diagram illustrating a configuration of an electronic terminal unit that communicates with an inverter device of a solar system according to an embodiment of the present invention.
4 is a diagram illustrating Modbus Transmission Control Protocol (TCP) communication between a master device and a slave device according to an embodiment of the present invention.
5 shows an example of a communication protocol used by a manufacturer of a specific inverter device.
FIG. 6 illustrates that an electronic terminal unit stores information about an apparatus for communicating according to an embodiment of the present disclosure.
7 illustrates a communication protocol between another electronic terminal unit and an inverter device according to another embodiment of the present invention.
8 illustrates a communication protocol between electronic terminal units according to another embodiment of the present invention.
9 is a flowchart illustrating a method of predicting a communication protocol of an inverter device of an electronic terminal unit according to another embodiment of the present invention.

Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. However, in describing the present invention, when it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted.

Modbus protocol using an embodiment of the present invention is made for the monitoring and control of industrial equipment, is a kind of serial communication (Serial Communication) for processing the request and response based on the master (Master) and slave (Slave) The types include RTU, ASCII, and TCP.

Inverter device is a device that is needed in solar system, and converts direct current into alternating current and communicates with devices that support Modbus protocol.

Hereinafter, referring to FIG. 1 and FIG. 2, a frame structure of a Modbus protocol according to an embodiment of the present invention is shown. 1 shows an RTU and an ASCII frame, FIG. 2 shows a TCP frame, and a frame of the Modbus protocol includes an application data unit (ADU) and a protocol data unit (PDU).

According to FIG. 1, a PDU frame of an RTU and an ASCII frame includes a function code field and a data field.

The Function Code field contains an instruction set code. The code can be used to read a memory value, and a value between 1 and 127 can be used. The data model consists of four types based on input, output, bit, and unit, and can be used differently by each manufacturer. For example, a data block may be designated for each type of data and used as four blocks, or divided into areas of bits and used as two data blocks.

 The data field may have a different structure depending on the function code field. Data includes Start address (start address of memory to access, 2Bytes), Length (length to read or write value from start address, 2Bytes), Byte Count (number of bytes of memory to read or write, 1Byte), Data [n] ( Memory values according to request and response).

The ADU of the RTU and ASCII frame further includes an Addition address field and an Error check field.

According to FIG. 2, the TCP ADU includes a MBAP (ModBus Application Protocol) header, a function code field, and a data field. The MBAP Header includes the Transaction ID, Protocol ID, Length, and Unit ID fields.

Specifically, the transaction ID is 2 bytes, and the master is incremented by 1 when the communication starts from the first 0x0000 value, and the slave can copy and use the value as it is and check whether the work is performed in pairs for the query and the response. . The protocol ID is 2Bytes, which represents the protocol ID. The TCP frame of Modbus can use a fixed value of 0x0000. The Length field is 2 Bytes, which can indicate the length from the position of the Length field to the end of the frame, and the number of bytes from the Unit ID to the end of the data. The unit ID can be used to identify the slave connected to the communication line other than 1 byte, TPC / IP.

3 is a block diagram illustrating a configuration of an electronic terminal unit (ETU) 100 that communicates with an inverter device 10 of a solar system according to an embodiment of the present invention.

According to FIG. 3, the electronic terminal unit 100 includes a communication unit 110, a storage unit 120, and a control module 130. The components shown in FIG. 3 are not essential to implementing the electronic terminal unit 100, so that the electronic terminal unit 100 described herein includes more or fewer components than those listed above. Can have.

The communication unit 110 communicates with the inverter device 10. For example, the communication unit 110 may communicate with the inverter device 10 by supporting the Modbus protocol.

The storage unit 120 may store unique information for each manufacturer of the inverter device. The storage unit 120 may include a flash memory type, a hard disk type, a solid state disk type, an SSD type, a SDD type, Multimedia card micro type, card type memory (eg SD or XD memory, etc.), random access memory (RAM), static random access memory (SRAM), read-only memory; ROM, an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, and an optical disk. The electronic terminal unit 100 may be operated in connection with a web storage that performs a storage function of the storage unit 120 on the internet.

The storage unit 120 may include manufacturer information including company registration information, product production information, delivery record information, etc. of the manufacturer who manufactured and supplied the inverter device 10, and the inverter device 10 manufactured for each manufacturer May include communication protocol (protocol) information. In addition, the storage unit 120 may store information for transmitting a protocol estimated based on manufacturer information DB, manufacturer DB protocol information, and the like to the inverter device 10.

However, since it is difficult for the storage unit 120 to acquire all the various inverter device information, the inverter information database 200 manages the inverter device information used in the existing solar system and the communication protocol information used by the inverter devices. can do.

The inverter information database 200 may communicate with a plurality of electronic terminal units and store communication protocol information of inverter devices.

The control module 130 finds the manufacturer information delivered in the corresponding period by referring to the manufacturing or installation date of the currently installed inverter device 10 or the photovoltaic system, and displays all the protocol information of the inverter device 10 released from the manufacturer. After the search, the sequential communication with the inverter device 10 is performed, and if the same protocol is found according to the communication result, the corresponding protocol is registered and set, and the output of the inverter device 10 is based on the registered protocol. Information (voltage, current, power, cumulative power, day power, log information, etc.) can be converted into an operating protocol and output.

When the control module 130 communicates with the specific inverter device 10, based on the manufacturer-specific information of the inverter device 10 stored therein, the control module 130 communicates the communication protocol of the specific inverter device 10 and the specific inverter device 10. If the control module 130 cannot recognize the communication protocol of the specific inverter device 10 and the specific inverter device 10 based on the manufacturer-specific information, the control module 130 may be recognized. The communication unit 110 may request the communication protocol information of the specific inverter device by accessing the inverter information database including the communication protocol information of the inverter device whose communication protocol is not recognized.

Then, the inverter information DB 200 may retrieve the corresponding information and transmit it to the electronic terminal unit 100, and the communication unit 110 may receive the information and predict the communication protocol of the corresponding inverter device.

The control module 130 may communicate with the specific inverter device 10 and the communication unit 110 based on the determined communication protocol, and may include current information, voltage information, and effective power information from the specific inverter device 10. At least one of transmission frequency information and power information may be received through the communication unit 110.

In addition, the control module 130 may provide the information collected through the communication unit 110 to the relevant institutions.

4 illustrates Modbus TCP communication between a master device and a slave device according to an embodiment of the present invention.

According to FIG. 4, the master device may be an ITU, and the slave device may be an inverter device. However, according to an embodiment, the master device may be a PC or the like, and the slave device may be various communication entities.

The communication between the master device and the slave device can be described by way of example. First, the master device can send the request 0x00 0x00 0x00 0x00 0x00 0x06 0x01 0x01 0x00 0x00 0x00 0x0F, and the slave can respond with 0x00 0x00 0x00 0x00 0x00 0x05 0x01 0x01 0x02 0x00 0x00. However, this is only one embodiment and may be implemented in other ways.

5 shows an example of a communication protocol of a manufacturer manufacturing a specific inverter device.

The field may include a start address, a data description, a data size, a data attribute, and the like, but embodiments are not limited thereto. For example, the start address field may include 30589, the data description field may include total increased self-consumption (Wh), the data size field may include U32, and the data attribute may include information such as FIXO and RO.

6 illustrates a method in which an ITU stores information about various inverter devices according to an embodiment of the present invention. Each field is explained as follows.

In detail, unit_id is a slave identification code of a slave, daq_code may be a data identification code used in a specific ITU, address is a starting address of data, wordcnt is a size of data, format is a specification of data, and scale is Data_unit indicates the number of units related to the display unit, use_flag indicates whether to use, device_type indicates the type of device to be connected (e.g., inverter, heat pump, LED lighting controller, etc.), con_name indicates the name of the connection to a specific ITU, and ip Denotes the IP address of the connection, port denotes the port information of the connection target, connector denotes the connection process name of a specific ITU, and description may indicate the remarks.

According to the present invention, even if there is no information on a specific inverter device in the storage unit 120, if only the characteristics of the above-described communication standards are collectively input, data communication may be performed without additional S / W development, and the device may be maintained. Even when the firmware is changed due to maintenance, it is possible to flexibly respond to device changes because only the content of the database needs to be modified.

Hereinafter, a method in which the electronic terminal unit 100 excludes information of the inverter information database 200 according to an embodiment of the present disclosure, and recognizes a communication protocol of the inverter device and the inverter device will be described.

First, the electronic terminal unit 100 may receive a frame of a Modbus communication protocol received from a specific inverter device that newly communicates. The Modbus communication protocol may be a frame used for the RTU / ASCII protocol or a frame used for the protocol for TCP.

In this case, the electronic terminal unit 100 may determine the frame type of the modbus communication protocol based on the information of the protocol identification field.

That is, when the protocol ID in the TCP frame is 0x0000, the electronic terminal unit 100 may recognize the frame as a TCP frame. When the protocol ID is not 0x0000, the electronic terminal unit 100 may recognize the frame as an RTU / ASCII frame. Can be.

Next, when the frame type of the determined Modbus communication protocol is Transmission Control Protocol (TCP), the electronic terminal unit 100 may specify a function code field and a data field based on the Length field.

If the frame type of the determined Modbus communication protocol is not TCP (Transmission Control Protocol) (RTU / ASCII), the electronic terminal unit 100 may specify a Fuction Code and Data field following the Addition Address field.

The electronic terminal unit 100 may monitor values of the function code and data fields in the information received from the inverter device in which the function code and data fields are specified for a predetermined time.

For example, the electronic terminal unit 100 may determine the cumulative power amount when the data value is the largest, and may determine the voltage and the current (the higher the voltage value) when the data change amount is the largest. In addition, when the value of the data is the second largest, it may be determined that the amount of power on the day is a data value, but embodiments are not limited thereto.

Hereinafter, a method of recognizing the communication protocol of the inverter device and the inverter device without the information of the inverter information database 200 by the electronic terminal unit 100 according to another embodiment of the present invention will be described.

7 illustrates a communication protocol between another electronic terminal unit and an inverter device according to another embodiment of the present invention, and FIG. 8 illustrates a communication protocol between electronic terminal units according to another embodiment of the present invention.

The electronic terminal unit may apply a protocol applied to a data request to an interleaver as follows. The frame includes 6 to 8 bytes and includes Header 1, 2, Station ID, Command,... , CheckSum may be included.

In addition, the electronic terminal unit may transmit 10 bits of data with another electronic terminal unit, and may include MSB, Bit 0 to Bit 7, LSB, and the like.

9 is a flowchart illustrating a method of predicting a communication protocol of an inverter device of an electronic terminal unit according to another embodiment of the present invention.

The electronic terminal unit first sets a Station ID (S910).

The Station ID may include a predetermined number of product serial numbers.

Next, the electronic terminal unit searches for headers 1 and 2 (S920), randomly sets a command, and calculates a checksum (S930).

That is, the electronic terminal unit can generate a communication data pattern in any way and transmit it to the inverter device.

Then, the electronic terminal unit performs a communication request to the corresponding device (S940).

At this time, when the electronic terminal unit receives data from the inverter (S950), it sets to the communication protocol of the inverter device (S960).

If the data is not received (S950), the data is sequentially increased, and the bytes are sequentially increased (S955).

In step S960, the electronic terminal unit sequentially modifies the command to perform communication (S970). By accumulating data for a predetermined time and communicating (S980), it is possible to define the data analysis and the final protocol (S990).

On the other hand, the functional operation and implementation of the subject matter described herein may be implemented in digital electronic circuitry, computer software, firmware or hardware including the structure and structural equivalents disclosed herein, or one or more of these It can be implemented in combination. Implementations of the subject matter described herein may be embodied as one or more modules related to computer program instructions encoded on a program storage medium of tangible type for controlling or by the operation of one or more computer program products, ie control systems. Can be implemented.

The computer readable medium may be a machine readable storage device, a machine readable storage substrate, a memory device, a composition of materials affecting a machine readable propagated signal, or a combination of one or more thereof.

As used herein, the term "system" or "device" encompasses all the mechanisms, devices, and machines for controlling data, including, for example, programmable processors, computers, or multiple processors or computers. The control system may include, in addition to hardware, code that forms an execution environment for a computer program on demand, such as code constituting processor firmware, a protocol stack, a database management system, an operating system, or a combination of one or more thereof. .

Computer programs (also known as programs, software, software applications, scripts, or code) may be written in any form of programming language, including compiled or interpreted languages, or a priori or procedural languages. It can be deployed in any form, including components, subroutines, or other units suitable for use in a computer environment. Computer programs do not necessarily correspond to files in the file system. A program may be in a single file provided to the requested program, in multiple interactive files (eg, a file that stores one or more modules, subprograms, or parts of code), or part of a file that holds other programs or data. (Eg, one or more scripts stored in a markup language document). The computer program may be deployed to run on a single computer or on multiple computers located at one site or distributed across multiple sites and interconnected by a communication network.

On the other hand, computer-readable media suitable for storing computer program instructions and data include, for example, semiconductor memory devices such as EPROM, EEPROM and flash memory devices, such as magnetic disks such as internal hard disks or external disks, magneto-optical disks and CDs. It may include all types of nonvolatile memory, media and memory devices, including -ROM and DVD-ROM disks. The processor and memory can be supplemented by or integrated with special purpose logic circuitry.

Implementations of the subject matter described herein include, for example, a back-end component such as a data server, or include a middleware component such as an application server, or a web browser or graphical user, for example, where a user can interact with an implementation of the subject matter described herein. It may be implemented in a computing system that includes a front end component such as a client computer having an interface or any combination of one or more of such back end, middleware or front end components. The components of the system may be interconnected by any form or medium of digital data communication such as, for example, a communication network.

While this specification contains numerous specific implementation details, these should not be construed as limited to any invention or scope of the claims, but rather as a description of features that may be specific to a particular embodiment of a particular invention. It must be understood. Likewise, certain features described herein in the context of separate embodiments may be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable subcombination. Furthermore, while the features operate in a specific combination and may be depicted as such initially claimed, one or more features from the claimed combination may in some cases be excluded from the combination, the claimed combination being a subcombination. Or a combination of subcombinations.

In addition, although the drawings depict operations in a particular order, it is to be understood that such operations must be performed in the specific order or sequential order shown in order to obtain desirable results, or that all illustrated acts must be performed. Can not be done. In certain cases, multitasking and parallel processing may be advantageous. In addition, the separation of the various system components of the above-described embodiments should not be understood as requiring such separation in all embodiments, and the described program components and systems will generally be integrated together into a single software product or packaged into multiple software products. Should understand that

As such, this specification is not intended to limit the invention to the specific terms presented. Thus, while the present invention has been described in detail with reference to the examples described above, those skilled in the art can make modifications, changes and variations to the examples without departing from the scope of the invention. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

Claims (4)

In the method for predicting the communication protocol of the inverter device provided in the solar power system,
Receiving a frame of a Modbus communication protocol received from a specific inverter device;
Determining a frame type of the modbus communication protocol based on information in a protocol identification field; And
If the frame type of the determined Modbus communication protocol is TCP (Transmission Control Protocol), the Function code field and the Data field are specified based on the Length field, and the frame type of the determined Modbus communication protocol is not TCP. If specified, the step of specifying the function code field and the data field based on the Addition address field,
Method for predicting the communication protocol of the inverter device provided in the solar power system,
Monitoring values of the specified Function code field and the specified Data field; And
Predicting a data attribute meant by the value of the Data field based on the value of the monitored Data field,
Predicting the data attribute,
If the value of the monitored data field is the largest among the collected values, predicting the value of the data field as a cumulative amount of power, the method of predicting a communication protocol of an inverter device included in a photovoltaic system. delete delete The method of claim 1,
Requesting communication protocol information of the specific inverter device by accessing the inverter information database including communication protocol information of the specific inverter device; And
When receiving communication protocol information of the specific inverter device, communicating with the specific inverter device based on the received communication protocol information. The method of predicting the communication protocol of the inverter device included in the photovoltaic power generation system.

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