«Computer-Aided Design System for Digital Substation based on open standards IEC 61850, 61131, 61499» T. Gorelik, O. Kiriyenko LLC EPSA RUSSIA

CAD for Digital Substation motivation: Installation of automation control systems for substations using conventional computer-aided design methods is complex time-consuming task which can hardly be unified. An introduction of new international standards (IEC 61850) and information technologies opens possibilities for new approaches to solve this task allowing creation of digital substations. The main particularity of IEC 61850 is that it regulates not only communication between individual devices but also substation, protection and automation device description

Design of digital and conventional substation comparison Digital Substation Conventional Substation ICD file: Formal device description including services, tags (signals) and much more Device documentation in vendor specific form (PDF, DOC, etc.) SSD file: Specification including single line diagram with functions assigned Project documentation in conventional form (AutoCAD, Visio, etc.) SCD file: System configuration description Project bindings (cable list) CID file: File used to configure device in project Device parameters list

ICD SSD SCD SCL file contents X X* Header (version, vendor, history, etc.) X Substation (single line diagram) X* IED (device description) Communication (IP and Ethernet addresses) Data Type Templates (device information model)

SCADA Studio – CAD for Digital Substations SCADA Studio offers new approach for digital substation design based on IEC 61850. The first step is creation of substation single line diagram. Single line diagram should conform to IEC 61850-6. This format can be used as well to export CIM RDF. The second step is intended to select tasks which should be solved by IEDs (protection, control, interlocking, measurement, etc.) bound to elements of single line diagram. Tasks in IEC 61850 are logical nodes. In this case logical nodes are assigned to single line diagram elements. This step is finished by creation of SSD.

Digital Substations design steps The third step is used to merge IEDs using ICD files provided by device vendors. Logical nodes assigned to single line diagram are linked to IED logical nodes. On this step main problem arises which prevents IEC 61850 usage for design. The problem is that many IED do not confirm to standard requirements in part of information model (IEC 61850 7-1,2,3,4).

Digital Substations design steps The fourth step is devoted to algorithm creation (distributed logic). IEC 61131 or IEC 61499 can be used. IEC 61131 or it parts are commonly implemented in IED. IEC 61499 was designed to provide distributed logic description. IEC 61499 offers new approach to algorithm logic design: Event-driven evolution instead of cycle evaluation. Communication between blocks using events.

Digital Substations design steps The fourth step is devoted to algorithm creation (distributed logic). IEC 61131 or IEC 61499 can be used. IEC 61131 or it parts are commonly implemented in IED. IEC 61499 was designed to provide distributed logic description. IEC 61499 offers new approach to algorithm logic design: Event-driven evolution instead of cycle evaluation. Communication between blocks using events.

Digital Substations design steps The fifth step is devoted to digital substation modeling. Modeling process can be automated using IEC 61850 and IEC 61131. To simplify modeling CAD should be integrated with IEC 61850 device simulator. Simulator is software which takes ICD or CID as inputs and provides MMS, GOOSE or SV communication over Ethernet like physical (real device). Additionally simulators allow PLC logic simulation using IEC 61131.

SCADA Studio include several modules for digital substation design: SCADA Studio modules SCADA Studio include several modules for digital substation design: ICD Manager (to create ICD files for IED vendors) SSD Editor (to create SSD files) SCL Editor (to create SCD files and export CID files) PLC logic editor based on IEC 61131 and OpenPLC)

Import and export of ICD files. ICD files version control. ICDManager module ICD Manager – software to create device description. ICD Manager functions are: Import and export of ICD files. ICD files version control. Creation and editing logical nodes, data objects and data attributes; Creating and editing of control blocks (GOOSE, Reports and Sampled Values).

ICDManager manager screenshots

SSDEditor module SSD editor is used to create single line diagrams and assign functions to primary equipment which should solved by IED like protection, control, measurements and automation. SSD file has well defined form which can be analyzed by computer software.

SSDEditor screenshots

SCDEditor module 1. SCD Editor provides ICD database which holds all device description: 2. Devices can be merged to project from database:

Создание конфигурации объектов (SCDEditor) 3. SCDEditor provides tools to bind SSD logical nodes to IED 4. SCDEditor provides tools to describe GOOSE and SV exchange:

Extended function of SCADA Studio PLC logic editor based on IEC 61131 and OpenPLC file format. Project testing using software simulator of IED. Export to external formats (MS Office, MS Visio, PDF, AutoCAD, etc.) and report creation tools.

IEC 61131 logic editor and debugger

Conclusion LLC EPSA has developed product which can be used in digital substation design – SCADA Studio. SCADA Studio can significantly simplify design and installation of automation control systems for substations . SCADA Studio is not vendor specific and is based on open standards. SCADA Studio provides not only design tools but also testing and modeling tools (PLC debugger and IED simulator).