CIM for UCTE

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CIM for UCTE

• Jay Britton
• jay.britton_at_areva-td.com

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Issues

• Business Process (Use Cases)
• How does the UCTE DACF compare with CIM model
  exchange processes?
• Format Compatibility
• UCTE DEF is a power flow format.
• CIM/XML (452/552) is an EMS model exchange format.

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UCTE Day-Ahead Congestion Forecast
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UCTE Day-Ahead Congestion ForecastII
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UCTE Day-Ahead Congestion ForecastIII
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The initial CIM model exchange standard focused
on transfer of complete models
CIM Exchange (full, partial, incremental update)
CIM import / export
CIM import / export


System A Import Model
System B Import Model
a
b
Proprietary / Home grown Extract / Merge Tools
Proprietary / Home grown Extract / Merge Tools
A Internal Model
Bs Model of A
System A Local Vendor Model
System B Local Vendor Model
As model of B
B Internal Model
System B EMS
System A EMS
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Basic 2-Region Process Example

• Site A makes a change
• A changes its ModelAuthoritySet using its CIM
  modeller.
• A imports the change into its EMS.
• A exports the change to B.
• B receives the change (full or incremental),
  updating As ModelAuthoritySet within its CIM
  modeller.
• B renames any new elements and repeats any
  reduction of As ModelAuthoritySet.
• B imports the new model into its EMS.

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Hierarchical Process Definition for an
Interconnection

• Bottom level.
• No significant differences.
• Export changes as the model authority.
• Import externals from the full interconnection
  model.
• Upper level
• Manages boundary sets.
• Creates the full interconnection model.
• Model quality evaluation.
• Study state estimation.
• Derives operational model in the same manner as
  lower levels.
• Different reduction criteria.
• Design extends to any number of hierarchical
  levels.

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The CIM Model Exchange Business Process
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Format Issue Bus-Branch Models

• UCTE (and other power flow formats) are
  bus-branch
• Substations have one bus for each normally
  connected set of bus sections.
• Switches and circuit breakers are normally not
  modeled.
• Bus numbers or names are often the key tool for
  engineers in navigating the model and comparing
  results.
• CIM EMS modeling is node-breaker
• Substation switches and breakers are normally
  modeled so that real-time configurations can be
  evaluated.
• Nodes represent bus sections and other electrical
  junctions.
• Buses are calculated as a result of topology
  processing.

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Format Issue Bus-Branch Models

• Problem has been discussed extensively in the
  2007 CIM for Planning.
• Solution
• Models that only require bus-branch detail simply
  use one CIM ConnectivityNode per Bus.
• When a CIM model is converted to bus-branch form,
  
• The output of the topology processor is used to
  form buses.
• Markers may be added to the CIM modelling to
  allow consistent buses to be named consistently.

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Format Issue Dynamic Data

• UCTE and CIM are not information equivalent
• UCTE (and other power flow formats) represent one
  point in time
• Load and generation at a bus
• Desired voltage
• Cap bank input
• CIM EMS models describe network parameters over
  time.
• Time Schedules
• Load Distribution Patterns
• Generation and Interchange

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Converting CIM Dynamic Data to UCTE

• EMS products have been converting EMS formats to
  various power flow formats, including EMS, for
  some time.
• Solution
• Scheduling functions calculate values at time T.
• Same procedures are used as occurs within an EMS
  to set up a power flow.
• Power flow formats are produced from power flow
  scheduling functions, not from the raw modeling
  data.

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Converting UCTE Dynamic Data to CIM

• Has been done when power flow cases are used to
  create external models for EMS.
• Solution One No Changes to CIM
• Power flow values for load, desired voltage, etc.
  are used to reverse engineer dummy schedules.
• Load distribution works pretty well, but other
  schedules are not usually very good and need
  amendment.
• This approach is most appropriate as a partial
  initialization procedure for externals.
• Solution Two CIM extensions required
• Single time point, power flow input variables are
  added to the CIM model.
• A new CIM Scheduled Output Interface is defined
  between scheduling and network analysis.
• UCTE data uses the new interface rather than the
  452 model exchange interface.
• This is probably the more appropriate solution
  for most real business situations.