Utility Substation System Integration

1
IEC-61850A Set of Specifications
forCommunication Networks and Systems in
Substations
2
Scope of IEC-61850
3
Goals Requirements of IEC-61850

• Provide Interoperability between all devices in
  substations
• The devices shall be connectable to a common bus
  with a common protocol (syntax)
• The devices shall understand the information
  provided by other devices (semantics)
• The devices shall perform together a common or
  joint function

4
Goals Requirements

• Static Design Requirements
• Free allocation of functions to devices support
  by communication
• Functions and their communication described as
  device independent
• Functions described to identify the information
  to be exchanged
• Open for future communication requirements

5
Goals Requirements

• Dynamic Interaction Requirements
• Generic information for communication
• Information transfer data with all related
  attributes
• Exchange data carry all attributes for a
  unambiguous understanding of the receiver
• Acceptable overall transfer time of exchanged
  data is defined and guaranteed in any situation

6
IEC 61850 Standard Organization

• Part 1 Introduction and Overview
• Part 2 Glossary
• Part 3 General Requirements
• Part 4 System and Project Management
• Part 5 Communication Requirements for Functions
  and Devices Models
• Part 6 Substation Automation System
  Configuration Language

7
IEC 61850 Standard Organization

• Part 7 Basic Communication Structure for
  Substation and Feeder Equipment
• 1 Principles and Models
• 2 Abstract Communication Service Interface (ACSI)
• 3 Common Data Classes
• 4 Compatible Logical Node Classes and Data
  Classes
• Part 8-1 Specific Communications Service Mapping
  (SCSM) Mapping to MMS

8
IEC 61850 Standard Organization

• Part 9-1 SCSM Serial unidirectional Multidrop
  point to point link
• Part 9-2 SCSM Mapping on a IEEE 802.3 based
  process bus
• Part 10 Conformance Testing

9
Parts - Organization
10
Overall Communication Architecture
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Substation Automation System Functions

• Three different logic level functions
• Process Level remote I/O, sensors, actuators
• Bay Level control, protection, monitoring
• Station Level station computer
• Process related station level
• Interface related station level

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Levels Logical Interfaces in SAS
13
IEC61850 Physical Architecture
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Function Categories

• System support
• Network management, time synchronization, PD
  self-test
• System configuration / maintenance
• Node identification, software management,
  configuration management, operative mode control,
  setting, test mode, system security management
• Operation / Control
• Access security management, control, syncro
  switching, parameter set, alarm, event, data
  disturbance fault record retreival

15
Function Categories

• Local Process Automation
• Protection function, bay interlocking
• Distributed automatic support
• Station wide interlocking, distributed
  syncrocheck
• Distributed Process Automation
• Breaker failure, automatic protection adaptation,
  reverse blocking, load shedding, load
  restoration, voltage reactive power control, in
  feed switchover, automatic switching sequences

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Logical Node and Link Concept
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Logical Node Concept Example
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List of Logical Node Groups
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LN Types

• Protection PDIS, PIOC, PTOC etc.
• Protection Related RREC, RSYN etc.
• Supervisory Control CILO (interlocking) etc.
• Interfaces, logging and archiving IHMI, ILOG etc
• Automatic Control ATCC etc
• Metering Measurement MMXU, MMTR etc
• Physical Device LLN0
• System Device Security GSAL

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Basic Protection Relay - PBPR
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Measurement Unit - MMXU
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Data Referencing
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Example Control and Protection LN
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Example Automatic Tap Changer
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Function Breakdown to LNs
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Common Data Class Examples
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Generic Substation Event Model GSE

• Provides fast and reliable system wide
  distribution of input and output data values
• Simultaneous delivery of event information using
  multicast / broadcast
• Generic substation event model (GSSE) provides
  wide range of possible data
• GOOSE provides state change information (Bit
  pairs)
• Based on publisher / subscriber mechanism

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GSSE Message Definitions
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GOOSE Message Definitions
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MMS Service Conformance for IEC-61850