KR101579928B1 - METHOD AND RECORDING MEDIUM FOR COMPATIBILITY BETWEEN IEC61850 AND CoAP - Google Patents

Abstract

The present invention relates to a reciprocal compatamizing method between IEC61850 and CoAP in which reciprocal compatability is ensured through matching between IEC61850 and CoAP, and information between IEC61850 and CoAP may be exchanged, and a recording medium thereof. The reciprocal compatamizing method between IEC61850 and CoAP according to the present invention comprises: a first step of mapping an information model of IEC61850 in a CoAP URI format; a second step of mapping a service of the IEC61850 with a method format used in the CoAP; and a third step of performing reciprocal communications by converting IEC61850 into CoAP through mapping of the first step and the second step.

Description

METHOD AND RECORDING MEDIUM FOR COMPATIBILITY BETWEEN IEC 61850 AND COAP < RTI ID = 0.0 >

The present invention relates to a technique for implementing compatibility between heterogeneous communication protocols, and more particularly, to a mutual compatibility method between an IEC61850 and a CoAP, and a recording medium thereof, which enable information exchange between them by matching IEC61850 and CoAP.

IEC61850 is a substation automation communication protocol that can be used both inside and outside substations. IEC 61850 expresses the information of the substation as a logical object and defines the data message in a standardized form.

CoAP, on the other hand, is a web-based protocol for the M2M environment adopted by the IETF CoRE working group and has the characteristics that can be used in small or low cost devices. The REST service is based on the SOAP concept and evolved into a lightweight service that replaces SOAP. Since CoAP follows this REST service technology, it is easy to work with HTTP, uses the same status code as HTTP, and has a merit that all information can be included in URI to send a message in order to express information concisely.

If this CoAP is available for information exchange between digital substation, smart distribution system and existing distribution automation system based on substation automation communication protocol IEC61850, substation can be managed and operated more efficiently.

In particular, the power system is installed in many places in the region, and the Smart Grid policy calls for the need to connect all systems to the Internet, and CoAP is one of the protocols that best fits these needs.

However, since IEC61850 and CoAP are different from each other in the transport layer and the application layer, there is no compatibility between them, and no technology for realizing compatibility between them has been proposed yet.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide an IEC61850 and CoAP interoperability between IEC 61850 and CoAP, And a recording medium therefor.

According to an aspect of the present invention, there is provided a method of interoperating between an IEC61850 and a CoAP, comprising: a first step of mapping an information model of an IEC61850 to a CoAP URI format; A second step of mapping the service of the IEC61850 to a method format used in the CoAP; And a third step of converting IEC61850 into CoAP through the mapping of the first step and the second step and communicating with each other.

According to the IEC61850 and CoAP interoperability method and the recording medium according to the present invention, it is possible to exchange information between IEC61850 and COAP, so that it is possible to easily obtain information on small-scale power systems installed in various places or renewable energy , The interoperability of the power infrastructure, the reliability, the efficiency, and the like can be improved, and it is also possible to exchange real-time power information between the supplier and the consumer.

1 is a block flow diagram illustrating a method of interoperability between an IEC 61850 and a CoAP according to the present invention;
2 is a conceptual diagram illustrating a method of compatibility between IEC61850 and CoAP according to the present invention;
3 is a diagram illustrating a CoAP URI mapping method of an IEC61850 information model according to the present invention.
4 shows an example of modeling the IEC 61850-2 ACSI information model of the present invention.
5 shows XCBR information of the present invention.
6 shows DPC class information of the present invention.
7 shows a time stamp type of the present invention.
8 is an example showing a message for converting the IEC61850 information of the present invention into CoAP information and sending it.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and will be described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

In the following, preferred embodiments, advantages and features of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block flow diagram illustrating a method of interoperability between an IEC61850 and a CoAP according to the present invention, and FIG. 2 is a conceptual diagram illustrating a compatibility method between an IEC61850 and a CoAP according to the present invention.

The present invention is a technology for realizing compatibility between heterogeneous communication protocols, and is characterized in that interoperability, that is, information transmission and reception is realized through matching between IEC61850 and COAP.

The CoAP (Constrained Application Protocol), which is a compatible object of the present invention, is a web-based protocol for an M2M environment and is easily usable in a small or low-cost apparatus.

CoAP uses CoAP REST, CoAP Transactions, and UDP as protocol stacks, and refers to OSI 7 layer standard communications. IEC61850 has TCP / IP in the transport layer, and there are Manufacturing Message Specification (MMS) and Abstract Communication Service Interface (ACSI) layers in the application layer. On the other hand, CoAP uses UDP in the transport layer and REST in the application layer.

Since IEC61850 and CoAP are different from each other in transport layer and application layer, the present invention is characterized in that IEC61850 information can be transmitted using a COAP through a CoAP Cross Mapping Layer.

The mapping layer (CoAP Cross Mapping Layer) of the present invention maps the information model of IEC61850 to the CoAP URI format (S10) and maps the service of the IEC61850 to the method format used by the CoAP (S20).

That is, the IEC61850 and CoAP interoperability method of the present invention includes a layer for mapping IEC61850 and COAP in IEC61850 and a COAP topmost application layer, and IEC61850 information is converted into CoAP through the mapping information to perform communication (S30) .

The IEC61850, a compatible object of the present invention, is a substation automation communication protocol that can be used both inside and outside of a substation. IEC 61850 models the substation information as a logical object and defines the data message as a standardized data structure.

The present invention is configured to match an IEC61850 information model with a COAP to implement interoperability between IEC61850 and COAP. According to a preferred embodiment, the IEC61850 information model to COAP conversion part is composed of an IEC61850-4 data model and IEC61850-2 ACSI (Abstract Communication Service Interface).

IEC 61850-2 ACSI defines the basic information model. IEC61850 basic information model consists of a server class> Logical Device Class> Logical Node Class> Data Class> DataAttribute Class, Inherits the superstructure. The Logical Device Class, Logical Node Class, Data Class, and DataAttribute Class refer to the Name Class and give each Class a name.

The data model is composed of a logical node class, a logical node (LN), a logical node data (LN Data), a common data class (CDC: Common Data Class, CDC DataAttribute, and CDC DataAttribute Types.

The data model defines a common data class (CDC), a CDC attribute (CDC Attribute), and a CDC attribute type (CDC Attribute Type).

The CDC Attribute Type refers to the basic data type (Boolean, int, float ...). CDC attribute means information expressed by "CDC Attribute Type" as "Qulity, Analog Value, Time Stemp, Vector" and the like. CDC is a data format that represents status information of substation equipment parts. It has status information such as Single Point Status (SPS), Double Point Status (DPS), and Integer Status (INS). Each CDC consists of a CDC attribute (CDC Attribute). A logical node (LN) refers to functions inside a substation. The logical node LN includes a system LN (N), a switch function X, a protection function P, a protection function R, a control function C, a general reference function G, I define the first letter of the logical node (LN) according to functions such as I, automatic control function A, measurement and metering function M, power transformer Y and instrument transformer T. Each logical node (LN) consists of several CDCs with meaning.

FIG. 3 is a diagram illustrating a CoAP URI mapping method of an IEC61850 information model according to the present invention, and Table 1 shows a mapping method of an IEC61850 service and a CoAP method according to the present invention.

Referring to FIG. 3 and Table 1, CoAP is a protocol similar to HTTP, and transmits data by expressing all data by URI. CoAP uses Internet URI to insert the information to be sent by "/" after the destination address like "coap: // destination address / Data /".

And CoAP includes message type and method (GET, POST, PUT, DELETE) information used in HTTP. You can request a message using the GET method, insert the information using the PUT method, and register the data to be used by the server through the POST method. DELETE is a service that deletes the data used by the COAP server.

 If the analyzed IEC61850 information model is mapped to CoAP URI, the structure of Logical Device Class> Logical Node Class> Data Class> DataAttribute Class can be expressed as "coap: // destination address / Logical Device / Logical Node / Data Object / Data Attribute" .

IEC 61850 ACSI provides services for data models. IEC 61850-7-2 defines this service standard. GetDataValues of IEC61850 is a service that requests the value of data. And SetDataValues is a service that inserts values into specific data. The service provided for the data model is mapped to the CoAP method as shown in Table 1 below.

CoAP Method IEC61850 ACSI Service Get GetDataValues Put SetDataValues

Referring to Table 1, "GetDataValues" among the IEC61850 ACSI services is mapped to the Get method of the CoAP, and "SetData Values" of the IEC61850 ACSI service is configured to be mapped with the Put method of the CoAP.

Hereinafter, a preferred embodiment of a concrete mapping method for matching the IEC61850 information model and the CoAP will be described.

4 is a diagram showing an example of modeling the IEC 61850-2 ACSI information model of the present invention. Referring to FIG. 4, a method of interoperability between IEC61850 and CoAP according to the present invention includes modeling a server class of an IEC61850-2 ACSI information model into a server type (Server_Type), and classifying a subclass Logical Device, And is configured to model a logical node, data, and data attributes according to an inclusion relation with reference to a name type.

 FIG. 5 illustrates XCBR information of the present invention, FIG. 6 illustrates DPC class information of the present invention, and FIG. 7 illustrates a time stamp type of the present invention.

The interoperability method between IEC61850 and CoAP according to the present invention uses the actual data such as " LD $ XCBR1 $ Pos $ t "" Logical Device Class> Logical Node Class> Data Class> DataAttribute Class "modeled in IEC61850 .

In "LD $ XCBR1 $ Pos $ t", "LD" stands for Logical Device and defines the device name. "XCBR1" is a logical node which means a circuit breaker (CBR) that performs a switch function (X) in a logical device. "Pos" is a data object, which means the location information of XCBR1 in Logical Device. And has a data type of DPC expressing state information of controllable data in the data model. "t" indicates time information with a data attribute. As a result, "LD $ XCBR1 $ Pos $ t" indicates the time information of the position information of the XCBR belonging to the LD.

XCBR is one of several LNs (Logical Nodes) belonging to LD, and class information as shown in Fig. 5 is defined in IEC61850 7-4. For reference, in the embodiment of the present invention, the LN (Logical Node) name is designated as XCBR1

The DPC in FIG. 6 is a data type of information represented by a data object. The data type of the data object is defined by the CDC and defines all data types in IEC 61850 7-3. The DPC is used as the data type of the Pos information represented in FIG.

The time stamp type information can be defined as shown in FIG. 7. Data type information for the IEC61850 data attribute is defined in IEC61850 7-2. The time stamp type (TimeStamp Type) is configured to be used as the data type of "t ".

As described and shown above, Logical Node, Data Object, and Data Attribute are all defined in IEC61850 standard. And "Logical Device> Logical Node> Data Object> Data Attribute" can be expressed as "LD $ XCBR1 $ Pos $ t" as actual data as described above.

If "LD $ XCBR1 $ Pos $ t" is expressed as a CoAP URI, it can be expressed as "coap: // destination address / LD / XCBR1 / Pos / t". IE61850 If you requested GetDataValues service that requests the time information of XCBR location information stored in Logical Device with ACSI service, COAP requests URI using Get method.

8 is an example showing a message for converting the IEC61850 information of the present invention into CoAP information and sending it. For reference, an example of FIG. 8 uses a message analysis program called Wireshark.

8, the " GetdataValues "service of IEC16850 is mapped to the CoAP GET method, and the message requesting LD $ XCBR1 $ Pos $ t information is mapped to" uri: LD / XCBR1 / Pos / As shown in FIG.

Hereinafter, the information request and response process between the CoAP client, the CoAP server, the IEC16850 client, and the IEC16850 server will be described with reference to FIG.

When the CoAP client (Client) requests information (GET) using the "coap: // destination address / LD / XCBR1 / Pos / t" URI information, the CoAP server in the mapping layer (CoAP Cross Mapping Layer) Maps information to the client.

LD / XCBR1 / Pos / t "information from the" coap: // destination address / LD / XCBR1 / Pos / t "URI information to the IEC61850 model information and delivers the" LD $ XCBR1 $ Pos $ t " . And because it is a Get method request to request specific data, it is mapped to the GetDataValues service.

The information mapped in the CoAP Cross Mapping Layer is passed to the IEC 61850 client. The IEC61850 client receives the "LD $ XCBR1 $ Pos $ t" information from the IEC61850 server using the GetDataValues service and sends the response information to the CoAP server.

The CoAP server sends a response message to the COAP client using the CoAP protocol and receives a response to the request "coap: // destination address / LD / XCBR1 / Pos / t".

 When the CoAP client requests the information insertion (PUT) using the "coap: // destination address / LD / XCBR1 / Pos / t" URI information, the CoAP server in the mapping layer (CoAP Cross Mapping Layer) .

LD / XCBR1 / Pos / t "information from the" coap: // destination address / LD / XCBR1 / Pos / t "URI information to the IEC61850 model information and delivers the" LD $ XCBR1 $ Pos $ t " . And because it is a PUT method request to insert specific data, it is mapped to the SetDataValues service.

The information mapped in the CoAP Cross Mapping Layer is passed to the IEC 61850 client. The IEC61850 client receives the "LD $ XCBR1 $ Pos $ t" information from the IEC61850 server using the SetDataValues service and sends the response information to the CoAP server.

The CoAP server that has received the response information transmits the response message to the CoAP client using the CoAP protocol and receives a response to the request "coap: // destination address / LD / XCBR1 / Pos / t".

The method of interworking between IEC61850 and CoAP according to the present invention described and illustrated above can be realized in a program form and realized through an electric / electronic device. The term " electrical < / RTI > electronic device " refers to a computer, and includes any electronic device including a central processing unit and a memory, such as a smart terminal.

In this case, the recording medium of the present invention has a first function for mapping the information model of IEC61850 to the electrical and / or electronic apparatus in the CoAP URI format, a second function for mapping the service of the IEC61850 to the method format used in the CoAP, 1 function and a third function for converting the IEC61850 into the CoAP through mapping according to the second function to enable mutual communication.

According to a preferred embodiment, the first function of the recording medium of the present invention is to designate "Logical Device Class, Data Class, Data Attribute Class" structure of IEC61850 information model as "coap: // destination address / Logical Device / Logical Node / Data Object / Data Attribute "URL format.

More specifically, the URL format of "coap: // destination address / Logical Node / Data Object / Data Attribute" mapped according to the first function of the recording medium of the present invention is "coap: // destination address / LD / XCBR / Pos / t "URL format.

Here, "LD" means a logical device and defines a device name. "XCBR" is a logical node which means a circuit breaker (CBR) that performs a switch function (X) in a logical device. "Pos" is a data object, which means XCBR location information in Logical Device. And has a data type of DPC expressing state information of controllable data in the data model. "t" indicates time information with a data attribute.

According to a preferred embodiment, the second function of the recording medium of the present invention is configured to map "GetDataValues" of the service of IEC61850 to "Get method" of CoAP, and "SetDataValues"

While the preferred embodiments of the present invention have been described and illustrated above using specific terms, such terms are used only for the purpose of clarifying the invention, and it is to be understood that the embodiment It will be obvious that various changes and modifications can be made without departing from the spirit and scope of the invention.

Such modified embodiments should not be understood individually from the spirit and scope of the present invention, but should be regarded as being within the scope of the claims of the present invention.

Claims (7)

delete As a method of interoperability between IEC61850 and CoAP,
A first step of mapping an information model of IEC61850 to a CoAP URI format;
A second step of mapping the service of the IEC 61850 to a method used in the CoAP; And
And a third step of converting the IEC 61850 into the CoAP through the mapping of the first step and the second step and communicating with each other,
In the first step,
And a structure of "Logical Device Class, Logical Node Class, Data Class, and DataAttribute Class" structure of the IEC61850 information model in the form of "coap: // destination address / Logical Device / Logical Node / Data Object / Data Attribute" Feature interoperability between IEC61850 and CoAP.
3. The method of claim 2,
The second step comprises:
Wherein the "GetDataValues" among the services of the IEC61850 is configured to map with the "Get method" of the CoAP and the "SetDataValues" to the "Put method ".
3. The method of claim 2,
The URL format of the "coap: // destination address / LD / XCBR / Pos / t" URL format (LD: Logical Device / XCBR is a Logical Node indicating a circuit breaker (CBR) that performs a switch function (X), and Pos is a Data Object indicating location information of the XCBR in a Logical Device, and t is a Data Attribute indicating time information) CoAP interoperability method.
delete In electrical and electronic devices,
A first function for mapping the information model of IEC61850 to the CoAP URI format;
A second function for mapping the service of the IEC61850 to a method used in the CoAP; And
And a third function for converting the IEC61850 into the CoAP through mapping according to the first function and the second function to enable mutual communication, the medium comprising:
Wherein the first function comprises:
Mapping of the "Logical Device Class, Logical Node Class, Data Class, and DataAttribute Class" structure of the IEC61850 information model to "coap: // destination address / Logical Device / Logical Node / Data Object / Data Attribute" URL format Wherein the program is recorded on a computer-readable medium.
The method according to claim 6,
The second function may include:
A program for realizing the function of mapping the "GetDataValues" and "SetDataValues " of CoAP with the " Get method" of the service of the IEC61850.

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