KR100857718B1 - System and method for data communication between heterogeneous device in substation - Google Patents

Abstract

The present invention relates to a data communication system between heterogeneous communication devices of a substation and a method thereof. As a protocol converter is installed between an intelligent electronic device and a remote monitoring controller, the protocol converter is based on a fieldbus transferred from the remote monitoring controller. Based on the data list and the IEC-61850-based data list, generate mapping tables mapped between heterogeneous data corresponding to each other, and search for heterogeneous data mapped with the requested data by referring to the mapping table when relaying request data. After the transfer to the device by converting the protocol of the response data obtained from the heterogeneous communication device according to the result, it is possible to communicate between the heterogeneous communication devices in a simple manner.

Substation, IED, IEC-61850, protocol, converter

Description

SYSTEM AND METHOD FOR DATA COMMUNICATION BETWEEN HETEROGENEOUS DEVICE IN SUBSTATION}

1 is a diagram illustrating a conventional fieldbus-based substation communication system.

2 is a view showing a substation system according to the IEC-61850 communication method of the general international standard.

3 is a diagram illustrating a data mapping and communication system between heterogeneous communication protocols in a substation according to an embodiment of the present invention.

4 is a diagram illustrating a configuration of a mapping table according to the present invention.

5 is a flowchart illustrating a data mapping and communication process between heterogeneous communication devices in a protocol converter according to an embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

100: intelligent electronic device (IED) 150: communication medium (fieldbus method)

200: remote monitoring and control device 250: communication medium (IEC-61850 type)

300: protocol converter 311: IEC-61850 communication module

315: IEC-61850 Database 331: Fieldbus Communication Module

335: fieldbus database 351: mapping processor

353: mapping memory 355: conversion processor

The present invention relates to a method of communicating data between heterogeneous communication devices of a substation. In particular, when the international standard IEC-61850 communication method is to be applied to a communication device of a substation, the device of the IEC-61850 communication method and the existing field The present invention relates to a data communication system between heterogeneous communication devices of a substation for enabling data communication between devices of a bus communication method and a method thereof.

FieldBus communication method (for example, DNP3.0, Modbus, etc.), which is currently used in domestic substations, is also a standard protocol, but there are various problems in which unique methods are added to each product manufacturer. And IEC-61850 as the international standard communication protocol for new substation automation in the United States.

1 illustrates a conventional fieldbus-based substation communication system, and includes a plurality of fieldbus-based intelligent electronic devices 1 such as relays, a communication medium 3, and a remote monitoring and control device 5.

The intelligent electronic device 1 (IED) corresponds to a relay that measures the power state and quality of the water / distribution panel and has a function of supplying and cutting off power.

The remote monitoring control device 5 corresponds to a client computer having a function of changing a setting of the intelligent electronic device through receiving data from the intelligent electronic device 1 or through a control command.

In addition, the communication medium (3) installed between the remote monitoring and intelligent electronic device has a variety of forms depending on the fieldbus communication method of the supplier, the fieldbus communication of the heterogeneous fieldbus communication by the supplier that developed the fieldbus communication It is not compatible with the equipment supplying it. Therefore, there is a disadvantage in that compatibility between systems having a configuration as shown in FIG. 1 using heterogeneous protocols.

Here, the aforementioned fieldbus-based intelligent electronic device 1 refers to an intelligent electronic device supporting fieldbus communication (DNP3.0, ModBus), and the communication medium 3 refers to serial and UTP used according to fieldbus characteristics. Physical communication line such as cable.

Figure 2 shows a substation system according to the IEC-61850 communication method of the international standard.

The IEC-61850-based intelligent electronic device 10 shown in the drawing is a relay having a function of measuring the state and quality of substation power and supplying and blocking power, and the remote monitoring and control device 50 is an IEC-61850-based intelligent electronic device. (10) A client computer having the function of changing the settings of an IEC-61850 based intelligent electronic device through receiving data or controlling commands.

The communication medium 30 between the IEC-61850 based remote monitoring control device and the intelligent electronic device is an Ethernet 31 and a hub 33 complying with the IEC-61850 standard.

IEC-61850 is a substation system standard developed with the aim of achieving interoperability, which is a disadvantage of the fieldbus communication substation, which is composed of existing supplier-defined methods. Therefore, there is mutual compatibility between products conforming to this standard.

The prior art is divided into a fieldbus communication method conforming to a supplier protocol as shown in FIG. 1 and an IEC-61850 communication method of an international standard aiming at mutual compatibility between suppliers as shown in FIG.

The remote monitoring control device may bring data owned by the intelligent electronic device through a communication medium, and the remote monitoring control device may change a setting of the intelligent electronic device through a command. In addition, the remote monitoring control device may bring data owned by the intelligent electronic device through a communication medium, and the remote monitoring control device may change the setting of the intelligent electronic device through a command.

Since the system according to FIG. 2 is not developed at the same time as that of FIG. 1, it is a separate system which is not compatible with the existing substation system of FIG. 1, and when the new substation configuration and the existing substation are changed, FIG. The system will be applied.

However, since the system of FIG. 2 uses a different standard from the existing system, it is difficult to apply the system of FIG. 1, and when applied only to a newly configured system, the system of FIG. 2 is not compatible with the system of FIG. There is a disadvantage to manage. Accordingly, data mapping between the data used in the existing fieldbus-based intelligent electronic devices and the IEC-61850-based intelligent electronic device or the remote monitoring and control device conforming to the standard is compatible with the existing fieldbus system and the international standard of FIG. 2. There is an urgent need for a plan to have

An object of the present invention is to enable the data communication between the existing fieldbus-based communication device and the IEC-61850-based communication device in the transitional stage of converting the substation system configured with the fieldbus communication method to the substation of the full IEC-61850 communication method. The present invention provides a data communication system and a method between heterogeneous communication devices of a substation.

Technical means of the present invention for achieving the above object, Fieldbus-based intelligent electronic device for performing the function of measuring the operating state and the amount of electricity of the various devices used in the water / switchboard and cut off the line in the event of an accident; IEC-61850 based remote monitoring that collects various measurement data from the intelligent electronic device or remotely controls the setting change of the intelligent electronic device, and generates a fieldbus based data list and an IEC-61850 based data list of the intelligent electronic device. Controller; And a mapping table that is installed between the intelligent electronic device and the remote monitoring control device and maps heterogeneous data mapped to each other based on the fieldbus-based data list and the IEC-61850-based data list transmitted from the remote monitoring control device. When the request data is relayed, the heterogeneous data mapped to the requested data is searched and transferred to the heterogeneous communication device by referring to the mapping table, and the protocol of response data obtained from the heterogeneous communication device is converted and provided according to the result. And a protocol converter for relaying data between communication protocols.

In more detail, the protocol converter may include: an IEC-61850 communication module communicating with a remote monitoring controller in an IEC-61850 based communication method; A fieldbus communication module for communicating with an intelligent electronic device through a fieldbus communication method; A mapping memory in which mapping tables in which heterogeneous data corresponding to each other are mapped are stored; Receives a fieldbus-based and IEC-61850-based data list from the remote monitoring and control device, creates a mapping table by mapping data corresponding to each other, and stores and maps the heterogeneous data with reference to the mapping table when relaying request data. A mapping processor for retrieving and determining the data to be mapped and delivering the same to a heterogeneous communication device; And a conversion processor for converting and outputting a protocol of the transmitted response data when the response data corresponding to the request data is transmitted from the heterogeneous communication device.

The protocol converter may further include a database storing IEC-61850 based data transmitted periodically or in real time from a remote monitoring controller; And a database storing fieldbus-based data transmitted periodically or in real time from the intelligent electronic device.

The technical method of the present invention for achieving the above object, the protocol converter comprises a first step of generating a mapping table mapped to the heterogeneous data corresponding to each other based on the fieldbus-based and IEC-61850-based data list; When the request data is transmitted from the IEC-61850-based or fieldbus-based device, the protocol converter searches for the heterogeneous data mapped to the requested data with reference to the mapping table, and then transfers the mapped data to the heterogeneous communication device. step; And a third step of converting the response data obtained from the heterogeneous communication device into a protocol of the requesting device.

Specifically, in the third step, the response data may be stored data collected periodically by the protocol converter from the heterogeneous communication device or data acquired by the protocol converter in real time from the heterogeneous communication device.

The first step may include receiving a fieldbus-based data list and an IEC-61850-based data list from a remote monitoring and control device; Generating a mapping table mapped to data corresponding to each other in the heterogeneous data list; And storing the generated mapping table in a mapping memory.

On the other hand, the first step, receiving a mapping table mapped between the data corresponding to each other between the fieldbus-based data list and the IEC-61850-based data list from the remote monitoring controller; And storing the transferred mapping table in a mapping memory.

Further, when the data requested from the communication device is a write request, the protocol converter converts the request data into a protocol suitable for the heterogeneous communication device and provides the heterogeneous communication device.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a diagram illustrating a data mapping and communication system between heterogeneous communication protocols in a substation according to an embodiment of the present invention, wherein the fieldbus-based intelligent electronic devices 100, the remote monitoring control device 200, and the protocol converter 300 are shown. Consists of including.

The field bus-based intelligent electronic device 100 is composed of a relay that measures the operation state and the amount of electricity of various devices used in the hand / switchboard and performs the function of blocking the line in the event of an accident.

The IEC-61850-based remote monitoring and control device 200 collects various measurement data from the intelligent electronic device 100 or remotely controls the setting change of the intelligent electronic device 100. It is configured to generate fieldbus based data list and IEC-61850 based data list.

The protocol converter 300 is installed between the intelligent electronic device 100 and the remote monitoring and control device 200, and is based on the fieldbus-based data list and the IEC-61850-based data list transmitted from the remote monitoring and control device 200. To generate mapping tables mapped between the heterogeneous data, and to retrieve the requested data and the heterogeneous data mapped to the heterogeneous communication device by referring to the mapping table when the request data is relayed, and then to the intelligent electronic device according to the result. It is configured to relay data between heterogeneous communication protocols by converting and providing a protocol of response data obtained from the device 100 or the remote monitoring and control device 200.

Here, the IEC-61850 data list is data according to the IEC-61850 international standard, and the fieldbus data list is a data list used for data monitoring and control in fieldbus communication.

Based on the protocol converter 300, the upper monitoring system 200, the communication system 250 such as the Ethernet 251, 255 and the hub 253, is a system conforming to the IEC-61850 communication standard. The intelligent electronic device 100, which is a system, and the communication medium 150, such as a serial or UTP cable, are systems that conform to the fieldbus communication standard following a provider-defined method.

In addition, the protocol converter 300, as shown in the figure, IEC-61850 communication module 311, fieldbus communication module 331, mapping memory 353, mapping processor 351 and the conversion processor 355 Consists of including.

The IEC-61850 communication module 311 is configured to communicate with the remote monitoring and control device 200 via the Ethernet 251 in an IEC-61850 based communication method, the fieldbus communication module 331 is fieldbus communication It is configured to communicate with the intelligent electronic device 100 via a serial or UTP cable 150 in a manner. Of course, a plurality of intelligent electronic devices 100 connected to a single remote monitoring and control device 200 may be divided into IEC-61850-based and fieldbus-based communication device, in this case IEC-61850-based intelligent electronics 100 is connected to the IEC-61850 communication module 311.

The mapping memory 353 stores a mapping table in which heterogeneous data corresponding to each other is mapped, and the mapping processor 351 receives a fieldbus-based and IEC-61850-based data list from the remote monitoring and control device 200. By mapping data corresponding to each other, a mapping table is generated and stored in the mapping memory 353. When request data is transmitted from the remote monitoring controller 200 or the intelligent electronic device 100, the heterogeneous data is referred to the mapping table. It is configured to search and determine the data that is mapped between and deliver it to heterogeneous communication devices.

When the response data corresponding to the request data is transmitted from the heterogeneous communication device, the conversion processor 355 is configured to convert the protocol of the transmitted response data according to the requesting communication device and output the corresponding communication module.

In addition, the protocol converter 300, the database 315 to store the IEC-61850 based data transmitted from the remote monitoring and control device 200 in a periodic or real time, and the periodic or real time from the intelligent electronic device 100 It may further include a database 335 that stores the fieldbus-based data delivered to.

The mapping table stored in the mapping memory 353 is preferably generated by the protocol converter 300 according to the fieldbus-based and IEC-61850-based data lists transmitted from the remote monitoring and control device 200, but the present invention. The present invention is not limited thereto, and after generating the mapping table in advance by using the data list based on the fieldbus and IEC-61850 in the remote monitoring and control device 200 according to the design, the generated mapping table may be transferred to the protocol converter 300. Of course it is possible.

In the mapping table stored in the protocol converter 300, as shown in FIG. 4, data of a specific region of the IEC-61850 is mapped to a specific point of the fieldbus data. That is, the data of the specific area (Node Data # 0) of IEC-61850 is mapped in the manner of mapping with analog data point 1 (Point # 1) of the fieldbus or digital data point 1.

Since the present invention is a method of mapping data between each other through a data index (eg, a point) of a fieldbus, it is not necessary to know the addresses of data storages of each other. For example, field 1 data can be dynamically mapped to each other only with information that it maps to data of a certain area (Leaf) of IEC-61850.

Accordingly, access through mapping IEC-61850 based communication data according to the present invention to fieldbus based data facilitates the operation of switching to a substation supporting the IEC-61850 communication protocol in a substation configured by the existing fieldbus communication method. Thus, the existing fieldbus communication substation can be made compatible with the substation according to the IEC-61850 standard of the international standard.

5 is a flowchart illustrating a data mapping and communication process between heterogeneous communication apparatuses in the protocol converter 300 according to an exemplary embodiment of the present invention.

First, the protocol converter 300 receives the fieldbus-based data list and the IEC-61850-based data list from the remote monitoring and control device 200, and the mapping processor 351 maps the data corresponding to each other in the heterogeneous data list. After generating the table, the generated mapping table is stored in the mapping memory 353 (S1). Of course, here, the remote monitoring and control device 200 generates a mapping table by mapping data corresponding to each other based on the fieldbus-based data list and the IEC-61850-based data list, and then provides the mapping table to the protocol converter 300. You may.

Hereinafter, only the case in which the request data is transmitted from the remote monitoring control device 200 to the intelligent electronic device 100 will be described. However, the present invention is not limited thereto. The request data from the intelligent electronic device 100 to the remote monitoring device 200 will be described. Even when transmitting, the mapping and communication process of the protocol converter 300 is the same.

For example, the protocol converter 300 transfers the request data for collecting (reading) predetermined data from the IEC-61850 based remote monitoring controller 200 to the mapping processor 351 when receiving the request data through the communication module (S2). In operation S4, the mapping processor 351 searches for heterogeneous data mapped with the requested data by referring to the mapping table shown in FIG. 4 stored in the mapping memory 353.

When the searched heterogeneous data is output to the fieldbus-based communication module, the fieldbus-based communication module transmits the heterogeneous data to the intelligent electronic device 100 (S5).

Subsequently, when response data for request data is transmitted from the intelligent electronic device 100 through the fieldbus communication module 331 (S6), the mapping processor 351 converts the response data obtained from the heterogeneous communication device into the conversion processor 355. ), And the conversion processor 355 converts the response data according to the IEC-68150-based communication protocol and transmits the data to the IEC-68150 communication module 311 (S7).

If the response data associated with the heterogeneous data is previously stored in the fieldbus database, the mapping processor retrieves the response data and delivers the response data to the conversion processor 355, and the conversion processor 355 transmits the response data to the IEC-. The data is converted according to the 68150-based communication protocol and transferred to the IEC-68150 communication module 311.

The protocol converter 300 periodically collects various data from the intelligent electronic device 100 and stores the data in the fieldbus database in advance, or when there is a data request from the remote monitoring controller 200, from the intelligent electronic device 100. It is possible to collect requested data in real time, and in some cases, the two methods may be mixed.

Therefore, the IEC-68150 communication module 311 transmits the response data converted into the IEC-68150 communication protocol to the remote monitoring and control device 200 through a communication medium such as Ethernet and a hub.

On the other hand, when the protocol converter 300 receives the request data for recording (write function) the predetermined data from the IEC-61850 based remote monitoring and control device 200 through the communication module and transmits it to the conversion processor 355 (S8). ), The conversion processor 355 converts the request data to match the fieldbus-based communication protocol and transmits the data to the fieldbus communication module 331 (S9).

Therefore, the fieldbus communication module 331 transfers the request data converted into the fieldbus communication protocol to the intelligent electronic device 100 through a communication medium such as serial.

The conversion of the protocol of the conversion processor 355 is different in the basic unit of data between heterogeneous communication devices, the process of matching the size (bit or byte unit) of the data in accordance with the protocol of the destination communication device in this way .

Here, the types and contents of data for data mapping between heterogeneous communication apparatuses are based on respective data lists stored in the mapping memory 353, and the data of reading and writing data is based on the contents of each data list. Is done.

FieldBus referred to in the present invention refers to an industrial communication protocol, and the present invention is applicable not only to data conversion through the protocol converter 300 but also to fieldbus data and other data conversion of IEC-61850 through other mediators. .

On the other hand, while the present invention has been shown and described with respect to specific preferred embodiments, various modifications and changes of the present invention without departing from the spirit or field of the invention provided by the claims below It can be easily understood by those skilled in the art.

As described above, the present invention converts data mapping and protocols between heterogeneous protocols using a protocol converter, thereby not changing all of the existing communication system of the substation configured by the fieldbus method to the IEC-61850 communication method. There is an advantage that can be applied to the substation system using IEC-61850 only to the remote monitoring and control system, which is a higher level system using the fieldbus type device.

Therefore, by reusing the already operated or installed fieldbus communication substation system, it is possible to easily switch to the international substation international automation protocol IEC-61850 method while reducing the capital investment cost when switching to the full IEC-61850 method. Have

Claims (10)

A fieldbus-based intelligent electronic device that measures the operation state and the electric quantity of various devices used in the water / distribution panel and performs a function of blocking a line when an accident occurs; It collects data on the operation status and electricity quantity of various devices measured by the intelligent electronic device or remotely controls the setting change of the intelligent electronic device, and also the fieldbus based data list and IEC-61850 based data list of the intelligent electronic device. IEC-61850 based remote monitoring and control device for generating; And The mapping table is installed between the intelligent electronic device and the remote monitoring control device, and generates a mapping table mapped between heterogeneous data based on the fieldbus-based data list and the IEC-61850-based data list transmitted from the remote monitoring control device. When the request data is relayed, the heterogeneous data mapped to the requested data is searched and transferred to the intelligent electronic device by referring to the mapping table, and the protocol of response data received from the intelligent electronic device is converted and provided to the remote monitoring controller. And a protocol converter for relaying data between heterogeneous communication protocols. The method according to claim 1, The protocol converter, An IEC-61850 communication module communicating with a remote monitoring control device based on an IEC-61850-based communication method; A fieldbus communication module for communicating with an intelligent electronic device through a fieldbus communication method; A mapping memory in which mapping tables in which heterogeneous data corresponding to each other are mapped are stored; Receives a fieldbus-based and IEC-61850-based data list from the remote monitoring and control device, creates a mapping table by mapping data corresponding to each other, and stores and maps the heterogeneous data with reference to the mapping table when relaying request data. A mapping processor for retrieving and determining the data to be mapped and delivering the same to a heterogeneous communication device; And a conversion processor for converting and outputting a protocol of the transmitted response data when the response data corresponding to the request data is transmitted from the heterogeneous communication apparatus. The method according to claim 2, The protocol converter is a data communication system between heterogeneous communication devices of the substation, comprising receiving a mapping table from the remote monitoring device and storing the mapping table. The method according to claim 2, The protocol converter may include a database storing IEC-61850 based data transmitted periodically or in real time from a remote monitoring controller; And a database storing fieldbus-based data transmitted periodically or in real time from the intelligent electronic device. The protocol converter may include a first step of generating a mapping table in which heterogeneous data corresponding to each other are mapped based on the fieldbus-based and IEC-61850-based data lists; When the request data is transferred from an IEC-61850 based or fieldbus based requesting device, the protocol converter searches for heterogeneous data mapped to the requested data with reference to the mapping table, and then transfers the mapped data to the heterogeneous communication device. Step 2; And And converting the response data received from the heterogeneous communication device into a protocol of the requesting device and transferring the response data to the requesting device, wherein the protocol converter includes a data communication method between the heterogeneous communication devices of the substation. The method according to claim 5, In the third step, the response data is stored data collected periodically by the protocol converter from the heterogeneous communication device or data obtained by the protocol converter in real time from the heterogeneous communication device. . The method according to claim 5 or 6, The first step may include receiving a fieldbus-based data list and an IEC-61850-based data list from a remote monitoring controller; Generating a mapping table mapped between data corresponding to each other in the fieldbus-based data list and the IEC-61850-based data list; And storing the generated mapping table in a mapping memory. The method according to claim 5 or 6, The first step may include receiving a mapping table mapped between data corresponding to each other between the fieldbus-based data list and the IEC-61850-based data list from the remote monitoring controller; And storing the transferred mapping table in a mapping memory. The method according to claim 5 or 6, The protocol conversion in the third step is a process of mutually matching the unit size (bit, byte) of the data between the heterogeneous communication apparatuses. The method according to claim 5 or 6, The protocol converter converts the request data into a protocol suitable for a heterogeneous communication device and provides the heterogeneous communication device to the heterogeneous communication device when the data requested from the communication device is a write request.

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