KR102081996B1 - System for Controlling Intelligence Motor Protection and Controller(IMPC) based on LoRa Communication - Google Patents

Abstract

The present invention provides a system for controlling an intelligent motor protection relay based on LoRa communication which can obtain temporal, spatial, and monetary gains. The system for controlling an intelligent motor protection relay based on LoRa communication comprises: a slave module having an intelligence motor protection and controller (IMPC) MCU to perform data processing and control of an intelligent motor protection relay and a slave LoRa MCU to convert data inputted from the IMPC MCU into a set LoRa wireless packet to transmit the LoRa wireless packet or convert a LoRa wireless packet received from the outside into data; and a master module having an AP MCU connected to a set user PC via wired communication to perform data transmission and reception with the user PC and process a Modbus frame packet received from the user PC and a master LoRa MCU to convert data inputted from the AP MCU into a set LoRa wireless packet to transmit the LoRa wireless packet or convert a LoRa wireless packet received from the outside into data and performing LoRa communication with the slave module.

Description

System for Controlling Intelligence Motor Protection and Controller (IMPC) based on LoRa Communication}

The present invention relates to an intelligent motor protection relay control system based on LoRa communication. Specifically, the present invention relates to a method for converting a conventional Modbus protocol method, which is a wired communication method, to a wireless communication method that can reduce distance and space constraints. In particular, it relates to an intelligent motor protection relay control system based on LoRa communication, which is suitable for data communication in an industrial field, which is very limited in establishing a wired communication network.

This section provides background information related to the present disclosure which is not necessarily prior art.

Modbus protocol is a classic wire-based communication protocol protocol. It is a wired communication method using SPI and UART communication. For the reason that the frame itself is simple and easy to implement, it is used for data collection and processing of controllers such as DMP (Digital Motor Protector) and IMPC (Intelligence Motor Protection and Controller) to process data in the industrial field. It is widely used for monitoring and control of various industrial automation equipment represented by PLC. Originally developed for serial communication, it has been extended to wired TCP / IP communication versions due to the necessity of application in a network communication environment.

Modbus protocol is one communication protocol, so for normal data communication between client and server, data packet suitable for Modbus Frame Structure should be transmitted. General Modbus (RTU, ASCII) frame structure is shown in FIG. Referring to FIG. 1, an address (station number) code is inserted in front of a frame to exchange 1: 1 communication with a specific device among multiple slaves, and then, a function code is created to determine what to do. This is an instruction set code provided by the Modbus protocol and a general function code is shown in FIG.

The data model is divided into four types based on input and output, bitwise access and wordwise access. The frame is completed by inserting the appropriate function code and data and CRC check code, and the communication is performed by exchanging the completed frame between master and slave. The structure of data varies slightly depending on the function code. Basically, it has the form of Start Address, Length, Byte Count, and Data. Start Address is the starting address of the memory to be accessed, Length is the length of R / W from the starting address, Byte Count is the number of bytes of memory data to be R / W, and Data is written to the real memory. Value

In the industrial field, communication line construction and laying is essential to establish a wired environment. This is a significant inefficiency in terms of cost, and as more slave devices are added, the cost of entering the communication line increases proportionally. In addition, since only communication between devices connected by wires is opened, there is a lack of diversity and a problem of distance limitation due to wires. In addition, since additional construction / buying is required according to the installation of additional controllers, it is also a disadvantage that the troubles due to facility stoppages, additional construction, etc. in an industrial site are required.

In order to operate the electronic protective relay or the controller accurately and quickly, there is a lot of data that need to set the operating characteristics for various industrial conditions. At the time of production, it is initialized with general data (Default Parameter) and shipped.

Therefore, in the field, it is necessary to reset each parameter with data suitable for the situation. Since protective relays and controllers are used in large quantities on site elements, it takes a lot of time to reset them one by one. Since there are so many types of controllers, they are often used differently (specially) for each device, so resetting the parameters of the device is very important. In addition, maintenance of the device during operation (operation). For management, it is necessary to monitor whether each data is working properly. For resetting and monitoring these parameters, RS485 / 232-based wired communication has been mainly used in the existing methods, but due to the nature of the industrial site, it can be considered that time and money are wasted in adding and laying communication lines when installing a new controller. have.

1. Korean Patent Publication No. 10-2013-0001343

The present invention (Disclosure), by receiving and transmitting parameters based on Lora communication, which is a wireless communication technique that can eliminate the waste of wire provision / burial, can see the time, space, money gains, frame structure of the existing wired communication It is an object of the present invention to provide an intelligent motor protection relay control system based on LoRa communication that can provide convenient converting that converts only the communication method while maintaining the system.

This section provides a general summary of the disclosure and is not a comprehensive disclosure of its full scope or all, provided that this is a summary of the invention. of its features).

In order to solve the above problems, the LoRa communication-based intelligent motor protection relay control system according to any aspect of the present invention, IMPC MCU that performs data processing and control of the intelligent motor protection relay A slave module having a slave LoRa MCU for converting and sending data from the IMPC MCU into a set LoRa radio packet or converting a LoRa radio packet received from the outside into data; And an AP MCU connected to the set User PC via wired communication to perform data transmission / reception with the User PC and to process Modbus Frame packets received from the User PC; and converting data from the AP MCU into a set LoRa wireless packet. Or a master LoRa MCU for converting LoRa radio packets received from the outside into data, and a master module for performing LoRa communication with the slave module.

In the LoRa communication-based intelligent motor protection relay control system according to an aspect of the present invention, an IMPC parameter memory connected to the IMPC MCU so as to transmit and receive data, the IMPC MCU can store or read the set parameter data; And an AP parameter memory connected to the AP MCU so as to be capable of transmitting and receiving data, and configured to store or read a default parameter set by the AP MCU.

In the LoRa communication-based intelligent motor protection relay control system according to an aspect of the present invention, the slave module, the slave antenna for performing wireless communication with the master module; A slave filter extracting wireless data transmitted and received by the slave antenna into a specific frequency and a specific bandwidth message; A slave receive buffer providing data extracted by the slave filter to the slave LoRa MCU; And a slave transmit buffer (Send Buffer) for providing the data transmitted from the slave LoRa MCU to the slave filter.

In a LoRa communication-based intelligent motor protection relay control system according to an aspect of the present invention, the master module, the master antenna for performing wireless communication with the slave module; A master filter extracting radio data transmitted and received by the master antenna into a predetermined specific frequency and a predetermined specific bandwidth message; A master receive buffer for providing the data extracted by the master filter to the master LoRa MCU; And a master send buffer (Send Buffer) for providing data transmitted from the master LoRa MCU to the filter.

In the LoRa communication-based intelligent motor protection relay control system according to an aspect of the present invention, the slave module further has a slave timer for controlling the time waiting for reception of wireless data through the slave antenna; The master module further includes a master timer for controlling a time of waiting for reception of wireless data through the master antenna.

According to the present invention, it is possible to eliminate the inconvenience in the existing wired communication by using the intermediate wireless communication method.

Wireless communication is more useful because it does not require a communication line, so it is possible to solve the cost problem caused by the new line, and it is more useful because it is possible to solve the temporal and spatial problems caused by the installation and there is no need to maintain the line.

In addition, there is no need to add new equipment because there is no need to add a new relay or a new AP.

The biggest advantage is in terms of distance.

In the existing wired communication, the limit of the communication distance according to the length of the line was clear, but wireless communication requires no additional work such as the extension of the line because the distance limitation is superior to the wired communication.

Above all, if the number of slaves, the limitation of the number of slaves (200 or so), which is a limitation of the Modbus type, which is wired communication, there is a possibility that the station numbers may overlap, the present invention can easily install the AP without additional line construction, and the station coefficient (AP unique number). ) To easily overcome the limitations noted above.

1 is a view showing a conventional general-purpose Modbus (RTU, ASCII) frame structure.
2 is a diagram showing an example of an instruction set code provided by a conventional Modbus protocol.
3 is a block diagram conceptually illustrating one embodiment of an intelligent motor protection relay control system based on LoRa communication according to the present invention;
4 is a system flow diagram of the master module in FIG.
5 is a system flow diagram of a slave module in FIG.

Hereinafter, embodiments of implementing an intelligent motor protection relay control system based on LoRa communication according to the present invention will be described in detail with reference to the accompanying drawings.

However, the intrinsic technical spirit of the present invention is not limited to the embodiments described below by the embodiments described below, and based on the intrinsic technical spirit of the present invention by the person skilled in the art It turns out that the embodiments described in the present invention encompass the range that can be easily proposed by the method of substitution or modification.

In addition, the terms used below are selected for convenience of description, and thus, in grasping the intrinsic technical spirit of the present invention, the terminology used herein is not limited to a dictionary meaning, and is properly interpreted in a meaning consistent with the technical spirit of the present invention. Should be.

3 is a block diagram conceptually illustrating an embodiment of a LoRa communication based intelligent motor protection relay control system according to the present invention, FIG. 4 is a system flow diagram of a master module in FIG. 3, and FIG. 5 is a slave module in FIG. 3. The system flow diagram of the figure.

3 to 5, the LoRa communication-based intelligent motor protection relay control system 10 according to the present embodiment includes a slave module 11 and a master module 12 that perform mutual LoRa communication.

The slave module 11 has an IMPC MCU (a) and a slave LoRa MCU (d1), and the master module 12 has an AP MCU (h) and a master LoRa MCU (d2).

IMPC MCU (a) is a configuration that performs data processing and control of the intelligent motor protection relay.

The slave LoRa MCU d1 is configured to convert data sent from the IMPC MCU (a) into a set LoRa radio packet and send it, or to convert LoRa radio packets received from the outside into data.

AP MCU (h) is connected to the set User PC (j) by wired communication to perform data transmission and reception with the User PC (j), and is a configuration for processing a Modbus Frame packet received from the User PC (j).

The master LoRa MCU d2 converts the data coming from the AP MCU h into a set LoRa radio packet and sends it, or converts a LoRa radio packet received from the outside into data.

The IMPC MCU (a) operates the data processing and the system as a whole, and there is an IMPC parameter memory (b) that can write the parameters processed by the IMPC MCU (a) or read the requested parameters.

The slave LoRa MCU d1 and the master LoRa MCU d2 each have timers c1 and c2 for counting the waiting time until receiving the Receive Message by a predetermined time.

In addition, the data coming from the IMPC MCU (a), AP MCU (h) is converted into LoRa radio packets by the slave LoRa MCU (d1) and the master LoRa MCU (d2), respectively, the antenna ( f1, f2).

On the other hand, the received wireless data catches only a specific frequency and a specific bandwidth message using the filters (e1, e2), and then enters the slave LoRa MCU (d1) and the master LoRa MCU (d2), respectively, and is converted into general data.

In addition, the slave module 11, the slave receiving buffer (r1, Receive Buffer) for providing the data extracted by the slave filter (e1) to the slave LoRa MCU (d1), and the data transferred from the slave LoRa MCU (d1) Has a slave send buffer (s1, Send Buffer) that provides to the slave filter e1.

In the same principle, the master module 12 transfers the data extracted by the master filter e2 from the master receive buffer r2 and the master LoRa MCU d2 to provide the master LoRa MCU d2. It has a master send buffer (s2, Send buffer) for providing the data to the master filter (e2).

AP MCU (h) has RS485 / 232 module (g) which is in charge of overall wired communication with User PC (j). Through this module, data request and return data transfer between User PC (j) and AP MCU (h). Do it.

AP MCU (h) processes Modbus Frame packet received from User PC (j), uploads it to master LoRa MCU (d2), and transmits Default parameter to Slave using AP parameter memory (i) where Default parameter is stored. To be able.

The operation of the LoRa communication-based intelligent motor protection relay control system 10 according to the present embodiment will be described with reference to FIGS. 4 and 5.

4 and 5, first, when the power of the master module 12 is turned on, the user first checks the station number of the connected AP, and then uses the RS485 / 232 module (g) communication with the User PC (j). Write a message conforming to the format and send it to the AP MCU (h).

After that, the AP MCU (h) checks the Modbus format validity of the received Modbus Frame, mounts it in the Lora Send Buffer (k), passes the processing to the master LoRa MCU (d2), and then LoRa MCU (d, h) After broadcasting the message converted into LoRa radio packet through the antenna (f), wait for the timer (c) running for the time specified for the Receive response in the slave (relay).

Next, the slave module 11 checks the master message transmitted wirelessly, processes it as requested, mounts the receive message back into the slave send buffer s1, and then transmits the receive message to the master.

By using the intermediate wireless communication method, it is possible to eliminate the inconvenience in the existing wired communication.

Wireless communication is more useful because it does not require a communication line, so it is possible to solve the cost problem caused by the new line, and it is more useful because it is possible to solve the temporal and spatial problems caused by the installation and there is no need to maintain the line.

In addition, there is no need to add new equipment because there is no need to add a new relay or a new AP.

The biggest advantage is in terms of distance.

In the existing wired communication, the limitation of the communication distance according to the length of the line was clear, but since wireless communication has a superior distance limitation than the wired communication, it is unnecessary to perform additional work such as extension of the line due to the change in the physical communication environment.

Above all, if the number of slaves, the limitation of the number of slaves (200 or so), which is a limitation of the Modbus type, which is wired communication, there is a possibility that the station numbers may overlap, the present invention can easily install the AP without additional line construction, and the station coefficient (AP unique number). ) To easily overcome the limitations noted above.

Specifically, the slave module 11 receives the broadcasting message from the master master LoRa MCU (d2) using the slave side antenna f1, and then filters the noise of the specified frequency and bandwidth using the filter e1. It catches and checks station number and station number, and checks first in slave LoRa MCU (d1) whether the target is correct among several slaves.

After that, if it is its target, it checks the function code in IMPC MCU (a) and executes the read / write check.

If it is a Read command, the specified parameter is read from the IMPC parameter memory (b), inputted to the slave Send Buffer (s1), the process is transferred to the slave LoRa MCU (d1) again, and the receive message is sent to the master LoRa MCU (f1) through the antenna (f1). d2).

If it is a Write command, it checks the parameters of the received message to determine whether it is a default parameter designation or a new parameter designation, and then replaces the existing parameters with the parameters sent to the IMPC parameter memory (b), and converts the completed Receive Message into a slave Send Buffer ( input to s1) and pass to slave LoRa MCU (d1).

Thereafter, the antenna is transmitted to the master LoRa MCU d2 through the antenna f1.

On the other hand, referring again to Figure 4, the master LoRa MCU (d2) waits for the timer (c2) by counting the wait time for receiving the Receive Message from the slave LoRa MCU (d1) by the User PC (j).

If the receive message is not received until the timer c2 is expired, the previous message is retransmitted from the master LoRa MCU (d2) to the slave LoRa MCU (d1) as many times as specified by the user PC (j).

If the Receive Message is not received even after retransmitting the designated number of times, the Master LoRa MCU (d2) creates a Communication Error message and sends it to the AP MCU (h) .This message is sent to the User PC (j) via the RS485 / 232 module (g). ) To let the user know that a communication error has occurred.

If the message is normally received from the slave LoRa MCU (d1) through the antenna (f2) and the filter (e2), the master LoRa MCU (d2) transmits the received message to the AP MCU (h) and converts it into Modbus Frame format to RS485 / Transfer to User PC (j) via 232 module (g).

Claims (5)

IMPC MCU for performing data processing and control of the intelligent motor protection relay, and slave LoRa MCU for converting and sending data from the IMPC MCU into a set LoRa radio packet, or converts LoRa radio packet received from the outside into data; A slave module having a;
AP MCU which is connected to the set user PC by wired communication to perform data transmission and reception with the user PC, and processes Modbus Frame packets received from the user PC; and converts data received from the AP MCU into a set LoRa wireless packet. A master LoRa MCU for sending or converting a LoRa radio packet received from an external source into data, the master module performing LoRa communication with the slave module;
An IMPC parameter memory connected to the IMPC MCU so as to be capable of transmitting and receiving data, and configured to store or read parameter data set by the IMPC MCU; And
And an AP parameter memory connected to the AP MCU so as to be capable of transmitting and receiving data, and configured to store or read a default parameter set by the AP MCU.
The slave module,
A slave antenna performing wireless communication with the master module;
A slave filter extracting wireless data transmitted and received by the slave antenna into a specific frequency and a specific bandwidth message;
A slave receive buffer providing data extracted by the slave filter to the slave LoRa MCU; And
It further has a slave transmit buffer (Send Buffer) for providing the data transmitted from the slave LoRa MCU to the slave filter,
The master module,
A master antenna for performing wireless communication with the slave module;
A master filter for extracting radio data transmitted and received by the master antenna into a predetermined specific frequency and a specific specific bandwidth message;
A master receive buffer for providing the data extracted by the master filter to the master LoRa MCU; And
It further has a master transmit buffer (Send Buffer) for providing the data transmitted from the master LoRa MCU to the filter,
The slave module further includes a slave timer for controlling a time of waiting for reception of wireless data through the slave antenna,
The master module, a master timer for controlling the time to wait for the reception of the wireless data through the master antenna; LoRa communication-based intelligent motor protection relay control system further comprising.

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