what is iec61850

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  IEC 61850 & IEC 61400-25  SCC

Motivation:sustainableinteroperability 

The standards IEC 61850 „Communication networks and systems for power utility automation“ and IEC 61400-25 „Communications for monitoring and control of wind power plants“ provide support for sustainable interopera-bility: Information Models, Information Exchange Methods, Protocol Mappings, and System Configu-ration Language (SCL) for Power Systems (Generation, Transmission, and Distribution for HV, MV, and LV, … ). 

Data Models

IEC 61850-7-4xx

 NettedAutomation  NettedAutomation  GmbH  GmbH 

Information & Communication Systems Information & Communication Systems 

Substations (7-4)  160 LN900 DO

Hydro Power (410)  

63 LN350 DO

DecentralizedEnergy Res. (420)  

50 LN450 DO

IEC 61400-25-2

Wind Power

16 LN250 DO  

Logical Nodes (LN) represent real-world Inputs, Outputs, Ratings, and Settings of functions or equipment. A LN provides a list of named data objects (DO). The LN “XCBR” represents a real “circuit breaker” with the dataobject (DO) “Pos” (Position). IEC 61850-7-2 defines Information Exchange Methods, e.g., for the position

(with Client/Server services, GOOSE, SMV). Data flow is specified by a SCL file (IEC 61850-6). 

61850-6 SCL configuration file

Realdevices insubstation

or windturbines

SCSM, e.g.61850-8-1

or 9-2 ...

 Virtual World

LN

LN

LNLN

OpCnt

Pos

 XCBR 

Logical device

virtualization

61850-7-4 logical

node (circuit breaker)61850-7-4 data

(position)

61850-7-2services

Single linediagram(topology)

Mappingreal worldto models

Models of thereal worldObjects

InformationExchangeServices

CommunicationMappings

CommunicationNetwork 

   C  o  n   f   i  r  u  r  a   t   i  o  n

   f   i   l  e

   (   S   C   L   )  ;  p  a  r   t   6

 Abstract communicationservice interface (ACSI);part 7-2 and 61400-25-3

When ?

Mapping to e.g. MMS inpart 8-1 andWebServices, DNP3, …in IEC 61400-25-4

How ?

Logical node, dataobjects, and common dataclasses; parts IEC 61850-7-4 and 7-3, 61400-25-2

What ?

IED Description (online)

    m    e    s    s    a    g    e

    s

    m    e    s    s    a    g    e    s

IED Description (off-line)

Communication profiles(Ethernet, TCP/IP, OSI

)

Information exchange

(publ./subscr., get, set,control, ... reporting,

logging, get IEDdescription)

InformationModels

CIMIEC 61968/70

 XCBR 

PDIS

WTUR 

CC

TCP/IPNetwork  MMSMMS

GOOSE/SMV Layer 2

QA1

QE1

QE2

QE3

QC1

QB1T1

Client/subscriber

Example see reverse side

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Example: Measurement LN “MMXU” represents power, voltages, currents, impedances, … in a three-phase electrical system. The valuescan be communicated by various services. The LN “MMXU” comprises values for measurements, monitoring, configuration, set-tings, description, and substitution. These values can be communicated by various services like read (polling), reporting, GOOSE,logging and log query. Recording and logging are build upon monitored value changes. The SCL configuration file .SCD (System

Configuration Description) specifies the single line diagram of the substation, the information model, the parameters of the con-trol blocks for reporting and logging, GOOSE, SV, the binding to the process and the data flow.

.SCD

TotWTotVArTotVA TotPFHzPPVPhV A

W VAr VA PFZ

Total Active Power (Total P)Total Reactive Power (Total Q)Total Apparent Power (Total S) Average Power factor (Total PF)FrequencyPhase to phase voltagesPhase to ground voltagesPhase currents (IL1, IL2, IL3)

Phase active power (P)Phase reactive power (Q)Phase apparent power (S)Phase power factorPhase Impedance

LN „MMXU “

current / voltage samples from instrumenttransformers by sampled value exchangeservices of IEC 61850-7-2 / IEC 61850-9-2(e.g., from Merging Unit)

LN PhsBTCTR  Amp

LN PhsBTVTR  Vol

Log

Read

Report

Configure

RetrieveModel

QueryLog

phsA.cValphsB.cValphsC.cVal

instValdead banded valueangle

range

 S V 

 S V 

RCB

LN and data objects

Process bus

Station bus

GOOSE GCB

… 4.000 …

samples/sec

QA1

QE1

QE2

QE3

QC1

QB1

T1

 Virtual World

...

OpCnt

Pos

 XCBR 

LNLNLN     M

    a    p    p     i    n    g

TCP/IPNetwork 

MMS

tn+2tn+1

value (tn)

Reports/GOOSE from server/publisher to client/subscriber 

(or store entries into IED log)

tn+3

value (tn+3)

tn   Time

stVal(Status

Value)

value (tn+1) value (tn+2)

FALSE

TRUE

MMS

Log

Read, or 

event-driven

Reports

GOOSE/SMV Layer 2

event-driven GOOSE message

MMS

Query

Log   statuschange

Information flow (example)

www.nettedautomation.com/seminars , www.nettedautomation.com/iec61850li , www.blog.iec61850.com 

© NettedAutomation GmbH, 2008-2010; by Karlheinz Schwarz, SCC (Karlsruhe/Germany), schwarz@scc-online.de  2010-11-22