Semantic Interoperability for Historical and Real Time

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A Espinosa Reza M L Torres Espindola M Molina Marin. WSEAS TRANSACTIONS on COMPUTERS E Granados Gomez H R Aguilar Valenzuela. 1 1 Literature review 4 Define a vision and strategy. In 5 authors describe an approach to publish 5 Define the implementation process. SCADA data into Web Services to contribute to the 6 Implement the integration platform. Smart Grid vision in the area of interoperability 7 Make the first CIM based integration project. among SCADA systems in electrical utilities The 8 Continue with systems integration. SCADA data model is based on the Common, Information Model CIM defined in IEC 61968 IEC Additionally apply the Smart Grid Architecture. 61970 and related standards The SCADA data are Model SGAM model is recommended see Fig 1. exchanged using an Enterprise Service Bus ESB, and the architecture implemented is aligned to the. IEC TC57 architecture for power system information. In the Smart Grid context interoperability depends. on a coordinated framework of protocols and, standards in order to reach this objective in 2 three. categories of interoperability for any system are, identified In the semantic category any information. model can be used as long as it meets with the, characteristics of being common to all the company.
or companies systems The semantic interoperability. compels to have a data model for the efficient,exchange of information between domain systems. This model should include the ability to receive and. send messages validated in the syntax format and, semantics meaning defined for the exchange Fig 1 Smart Grid Architecture Model SGAM. framework 4,Currently in many utilities there are working. numerous information systems that process and In 7 a mobile application is presented as result of. contain valuable information for the efficient information systems integration The application. operation of the electric power system their provides useful information regarding assets and state. integration has been achieved in a traditional way of network in the field and is part of the EPRI. through specialized point to point interfaces as IntelliGrid program Application includes some. shown in 10 11 and 13 abilities to show Asset information Map View for. network data with geographical positioning see Fig. The complexity of maintaining these interfaces over 3 and an augmented reality interface for the. time and adapting them to new requirements compels electrical network model Many data transformations. establishing new integration schemes applying where implemented in order to reach objectives Fig. standards with a low level coupling for example Web 2 shows the logical architecture implemented. Services WCF Services OPC Services among, others so that a single data interface can be used in a. generic way without relying on the technology or the. specific data model for each source or target system. In 10 and 11 it is shown a Service Oriented,Architecture SOA using an Enterprise Service Bus.
ESB as a mean of transferring messages that meet,with a common data model or scheme. In 6 authors propose a generic strategy for CIM, adoption based in 8 points Fig 2 Data transformation architecture for. 1 Get to know CIM and related systems Grid i View application 7. integration technologies,2 Get familiar with CIM tools. 3 Make a test CIM model of a part of a,distribution network. E ISSN 2224 2872 2 Volume 15 2016, A Espinosa Reza M L Torres Espindola M Molina Marin.
WSEAS TRANSACTIONS on COMPUTERS E Granados Gomez H R Aguilar Valenzuela. Thus a CIM Wrapper Server Type Fig 4 is a, type of data interface specialized in extracting data. from the source systems data layer making, transactions calculations and conversions defined in. the Semantic Model of the utility and deliver the, response in a specific and standard format under the. rules and structure commonly defined by all,involved 8. For its part a CIM Wrapper Client Type is the,application that can consume the services and.
understands the information shared by a CIM,Wrapper Server Type it uses the same Semantic. Model to understand in a common way the format,and meaning of the message CIM Instance received. as response,Fig 3 Grid i View application GUI example. network data with geographical positioning 7,3 Methodology. 2 CIM Wrappers The process for developing a CIM Wrapper is not. only a programming task it is a whole process that. For the development of data interfaces that meet with involves Mapping activities between the concepts of. the Semantic Model of the utility it is required to legacy systems and the concepts defined in CIM in. establish a specific architecture that allows the order to agree the meaning of the information to be. translation of the source data into a common format exchanged the message format or CIM Instances as. syntax and meaning semantics which can be well as the structure of the requests and responses of. understood by all actors in the domain of the desired the data interfaces or services that exposes the. integration information of the data source,The Common Information Model CIM Base.
defined in standard IEC 61970 Part 301 14 is used,to build the Semantic Model as well as the. extensions for the Distribution Domain defined in,standard IEC 61968 Part 11 15. In addition CIM also establishes rules for specialized. extension to allows to any company to take the base. model CIM Base and customize it to a specific, context to meet specific needs in 3 extension rules. are described as well as some examples It is,recommended to do the minimum amount of. extensions since being specific to the utility or the. application context these extensions will not be,compatible with products that comply with the.
standard CIM Base,On 8 and 9 it is detailed the adoption process of. CIM in an electric utility the described methodology. and sequence are applied to the present development. of CIM Wrappers,Fig 4 Architecture for a generic CIM Wrapper. Server Type,E ISSN 2224 2872 3 Volume 15 2016, A Espinosa Reza M L Torres Espindola M Molina Marin. WSEAS TRANSACTIONS on COMPUTERS E Granados Gomez H R Aguilar Valenzuela. 4 Architecture devices and thus have the advantages and benefits. equivalent to the architecture and technology, The architecture used for the semantic described for Process monitoring in your hand 12. interoperability of the systems with historical and. real time information is described below and goes 4 2 Transactions. according to Fig 4 Additionally two layers for Because of the large amount of information that is. standard data access were included one based on requested and transmitted the access to historical. OPC UA and other based on WCF Services data of an information system can cause conflicts and. Windows Communication Foundation as showed in a poor performance of the computer equipment that. Fig 5 support them in the historical data CIM Wrapper a. transactions layer has been added which apart from. mapping the information to the CIM concepts that, model it allows to perform a data smart extraction.
through a series of calculations to optimize the,desired results so that is very simple to perform. advanced queries that present calculated values such. as the average maximum minimum summation,among others embedded in specific periods i e. annual monthly weekly daily and hourly, Additionally this layer is in charge of ensuring the. stability or operational security by limiting the time. and amount of information to be transmitted so if a. suspect request is detected e g request all data,from all metering equipment installed this layer. limits the request and response data providing for. example only a sample of the first 100 data from the. first 10 meters so for a very long request the,Consumer application is obliged to carry out the.
requests explicitly filtering settings using several. consecutive requests ensuring that the data source. server network and applications are not saturated and. all simultaneous Customers receive adequate,response in the shortest possible time. The transactions layer for historical data has enabled. the optimization of response times by over 90, Fig 5 Modified architecture for a CIM Wrapper compared to a simple raw data extraction. Server Type for historical and real time information. Transactions for real time data are limited to doing. 4 1 Data layer the mapping of concepts to the company Semantic. Access to data from the source systems was Model,performed using the specific technology of each. system in this case MySQL ODBC was used for 4 3 CIM Translation. historical data and SQL Server ODBC for real time This layer performs the format conversions of the. data Once extracted the data are presented through received data to the format schema and rules defined. an OPC UA Service to allow the access reuse through in CIM and in the Semantic Model so that the. an international standard 17 likewise it enables information to be presented will be encoded. decouple the data layer and increase the interface according to CIM on a message or CIM Instance. security on its whole,Any CIM Instance received from the CIM Wrappers. Subsequently the data are consumed by an OPC UA shall comply with the format and structure of the. Client in charge of expose data using a native WCF Semantic Model to be accepted as valid so it can be. Service Windows Communication Foundation to verified by any specialized tool in order to meet the. allow access through better technology for mobile established Semantic Interoperability scheme. E ISSN 2224 2872 4 Volume 15 2016, A Espinosa Reza M L Torres Espindola M Molina Marin.
WSEAS TRANSACTIONS on COMPUTERS E Granados Gomez H R Aguilar Valenzuela. 4 4 CIM Interface basically uses two segments or CIM hierarchies. Finally once the data has been extracted formatted Organizational Structure and Measurements. and translated the CIM interface is responsible for. presenting the information through the rules defined 6 1 Organizational Structure. in the standards 16 as well as in respecting the Allows to identify in a unified manner any area or. company s agreements administrative unit and includes some extensions to. the Base CIM in order to suit actual conditions see. This CIM Interface is responsible for answering the Fig 6. requests from the Client applications so it must cl a ss Est r uct ur a B a si ca. contain a set of validation rules for messages,C or e I dent i f i edO bject C FE Di r ecci on. according to CIM as well as implement the,aliasName String 0 1. established agreements namely it must integrate the mRID String 0 1. company s specific communication rules plus the name String 0 1 CFE Direccion 0 1. standard rules such as error handling access, security or schemes for complex processing CFE SubDirecciones. The CIM Interface for the Wrappers developed for Geogr a phi ca l Regi on C FE SubDi r ecci on. historical and real time data presents the information. through WCF Services Windows Communication CFE Subdireccion 0 1. Foundation which is one of the accepted Region 0 1. technologies in the standard IEC 61968 100 16 and CFE GeographicalRegions. encodes the information according to the company s Regions 0 0. CIM Profile 8 and 9,C or e C FE Geogr a phi ca l Regi on. SubGeogr a phi ca l Regi on,OPC UA OPen Connectivity Unified Architecture.
is a set of industrial standards for the,Region 0 1 C FE SubGeogr a phi ca l Regi on. interconnectivity of systems provides a common,interface for communications between different. products from different suppliers In 9 it is Substations 0 CFE SubGeographicalRegion 0 1. described in detail some of the advantages of having C or e Subst a t i on. a single connectivity standard for equipment and CFE Areas 0. industrial information systems with measurements C FE A r ea. acquired and stored in historical records,The OPC UA interoperability standards were. developed by the OPC Foundation and are the ConnectivityNodeContainer. C FE Subst a t i on, successors to the OLE for Process Control OPC C or e. Equi pment C ont a i ner, Although it was developed by the same organization.
OPC UA differs significantly from its predecessor CFE Subestacion 1. the objective was to remove the reliance on the CFE Circuitos 0. Component Object Models COM and DCOM to a,C FE C i r cui t o. Service Oriented Architecture SOA for the control,of industrial processes. Fig 6 CIM Class Diagram for the Organizational,OPC UA is formally documented in the IEC 62541. Structure hierarchy,standards group and enables among other things to. define the Semantic Model of the information to be. transmitted 17 CFE Direcci n Allows modeling,administrative Directorates Directorate.
General Operation Administration etc,6 Semantic Model CFE SubDirecci n Allows modeling. The segment of the Semantic Model used in the CIM administrative sub Directorates Generation. Wrappers for the historical and real time information Transmission Distribution etc. E ISSN 2224 2872 5 Volume 15 2016, A Espinosa Reza M L Torres Espindola M Molina Marin. WSEAS TRANSACTIONS on COMPUTERS E Granados Gomez H R Aguilar Valenzuela. CFE GeographicalRegion Represents an,administrative unit with influence over a. defined territorial region Distribution,Division Control Area etc. SCADA data model is based on the Common Information Model CIM defined in IEC 61968 IEC 61970 and related standards The SCADA data are exchanged using an Enterprise Service Bus ESB and the architecture implemented is aligned to the IEC TC57 architecture for power system information exchange In the Smart Grid context interoperability depends on a coordinated framework of protocols and

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