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CIM for UCTE

CIM for UCTE. Jay Britton jay.britton@areva-td.com. 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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CIM for UCTE

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  1. CIM for UCTE Jay Britton jay.britton@areva-td.com

  2. 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.

  3. UCTE Day-Ahead Congestion Forecast

  4. UCTE Day-Ahead Congestion ForecastII

  5. UCTE Day-Ahead Congestion ForecastIII

  6. 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 B Import Model System A Import Model a Proprietary / Home grown Extract / Merge Tools Proprietary / Home grown Extract / Merge Tools b A Internal Model B’s Model of A System A Local Vendor Model System B Local Vendor Model A’s model of B B Internal Model System B EMS System A EMS

  7. 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 A’s ModelAuthoritySet within its CIM modeller. • B renames any new elements and repeats any reduction of A’s ModelAuthoritySet. • B imports the new model into its EMS.

  8. 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.

  9. The CIM Model Exchange Business Process

  10. 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”.

  11. 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.

  12. 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

  13. 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.

  14. 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.

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