Question 1

1
g
GE Power Management
Utility Communication Architecture - UCA
2
Utility Communication Architecture - UCA
g
GE Power Management

• Arose from the need for common communication
  across the utility enterprise
• Basic definition started in 1998
• Defines a suite of protocols to address all
  utility communication requirements
• Has recently focused on Substation Communications

3
7-Layer UCA Model
g
GE Power Management
4
Substation Integrated Protection, Control and
Data AcquisitionPhase 1, Task 2Requiremenets
Specification
g
GE Power Management

• ERPI - RP3599-01

5
Typical Substation UCA Real-Time Architecture
g
GE Power Management
6
Participating UCA Vendors
g
GE Power Management

• GE/ Multilin
• Basler
• Cooper
• Beckwith
• Tasnet
• SEL
• GE Harris

• Siemens (Relays)
• Siemens (HMI)
• LG
• Doble
• Dranetz/ BMI
• Modicon/ Square D

7
Utilities Participating in UCA
g
GE Power Management

• American Electric Power (AEP)
• Indianapolis Power Light
• Ontario Hydro
• Northern States Power
• Tampa Electric
• ComEd
• Cinergy
• Baltimore Gas Electric
• GPU
• Nuon

• Enetergy
• TVA
• Duke
• Boston Edison
• Union Electric
• Florida Power Corp.
• Southern California Electric
• Wisconsin Electric
• ESKOM

8
Planned UCA Demo Sites
g
GE Power Management

• 1. AEP - INEZ Project - March, 1998 (added this
  meeting)
• 2. TVA - Transmission - April, 1998
• 3. AEP - Distribution - May, 1998
• 4. GPU - Distribution - May, 1998
• 5. OH - Transmission - December, 1998
• 6. BE - Distribution - November, 1998
• 7. NSP - Transmission - November, 1998
• 8. Duke Power - December, 1998 (added this
  meeting)
• 9. SCE - December, 1998 (added this meeting)
• 10. AEP - Transmission - June, 1999

9
MMS Service Specifications
g
GE Power Management

• Defines a set of objects that can exist within a
  device.
• Defines a set of communication services to access
  and manipulate those objects.
• Defines the behaviour of the device to those
  communication services.

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MMS Objects
g
GE Power Management

• Domain
• Program Invocation
• Variable
• Type (Variable)
• Semaphore (2)
• Operator Interface
• Event Condition
• Event Action
• Event Enrollment
• Journal
• File

11
Simple Type Definition
g
GE Power Management

• A Sample Type definition consists of Class and
  Size

• Type Classes
• BOOLEAN
• BIT STRING
• INTEGER
• UNSIGNED (INT)
• FLOAT (IEEE)
• REAL (ISO)

• VISIBLE STRING
• OCTET STRING
• GENERAL TIME (ISO)
• BINARY TIME (MMS/C)
• BCD

• Although MMS Data has the form information built
  in (integer, string, boolean, etc.), only the
  Type definition has the size information needed
  to convert to local format.

12
Modelling Example
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GE Power Management

• Two Real Objects
• Program Memory
• Data Memory

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MMS Services
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GE Power Management

• Get Object
• Change Object
• Determine Attributes
• Create Object
• Delete Object

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Named Variable Object
g
GE Power Management

• A named MMS object representing a real variable
• Only the name is needed to access
• Attributes
• Object Name (scope)
• MMS Deletable (boolean)
• Type Description
• Access Method (Public, etc.)
• Address (Public only)
• Be careful about using addresses where the
  address can change from one run-time to the next

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Domain
g
GE Power Management

• Represents a resource within the VMD
• Domains are typically
• Program Memory
• Recipe Memory
• Data Memory, etc.
• Domains may be pre-named

16
Domain Services
g
GE Power Management

• Upload

InitiateUploadSequence UploadSegment TerminateUplo
adSequence

• Download

InitiateDownloadSequence DownloadSegment Terminate
DownloadSequence

• Each upload sequence is assigned a unique ID
  Number to track multiple uploads in progress
• Domain data is sent over the network in segments
• InitiateDownloadSeq creates domain
• If domain exists must delete first

17
Unconfirmed Services
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GE Power Management

• Unconfirmed services consist of only the request
  and indication service primitives
• UnsolicitedStatus
• InformationReport
• EventNotification

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Program Invocations
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GE Power Management

• An execution thread consisting of one or more
  domains
• A program invocationcan be started, stopped, etc.
• A P.I. may be pre-named

19
Relay Data Functions
g
GE Power Management

• Settings

Control
Present Values
Historical
Upload Download Change Switch Group
Pswd Control Bkr Open Bkr Close Enable
Outputs Disable Outputs
Present Values Status Pwr Quality
Fault Report Oscillography Demand Data
20
Common Application Service Models (CASM)
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GE Power Management

• Generic Communications Services
• Data Access
• Data (and exception) Reporting
• Device Control, Tagging
• Self Describing Devices
• Detailed Mapping of Data Objects to MMS
• Detailed Mapping of Generic Services to MMS
  Services

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Common Application Service Model
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GE Power Management

• MMS Services Required

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Relationship of CASM and GOMSEE
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GE Power Management
23
General Object Model
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GE Power Management

• for Substation Field Equipment (GOMSFE)

• Object Modeling is a technique for identifying
  data elements in a device
• Defines standard names, attributes and behaviours
  of the data elements
• Allows for the re-use of names
• Provides the foundation for the information
  needed for self-decription

24
Protocol
g
GE Power Management

• A set of rules for operating a communication
  system
• Areas addressed by rules
• Framing
• Error Control
• Sequence Control
• Transparency
• Line Control
• Timeout Control
• Startup Control
• Special Cases

25
g
GE Power Management
Utility Communication Architecture - UCA