Transcript Portable Data and Modeling for Electromagnetic Transient

Portable Data and Modeling for
Electromagnetic Transient Analysis
programs
Jean Mahseredjian
[email protected]
Ecole Polytechnique de Montreal
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New IEEE Task Force
• Co-chairmen: Jean Mahseredjian and Taku Noda
• Portable Data and Modeling for Electromagnetic Transient
Analysis programs
• Objectives
– Explore the possibility to define a portable (common) input
format (PIF) for all electromagnetic transient programs (EMTPtype programs)
– Ultimately the format may be extended to modeling
methods/definition in addition to modeling data
– Ultimate goal: Establishment of a standard
• Participants:
– Off-line and real-time EMTP-type software vendors
– Universities
– Utilities (important support due to predicted impact)
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Subject
• Simulation and analysis of power system transients
– EMTP-type applications:
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Capability to simulate electromagnetic transients
Capability to simulate electromechanical transients (detailed)
Time-domain simulations, circuit based
Wideband models: from steady-state to switching transients and
to lightning
• Time-steps: microseconds, rarely exceeds 0.5 ms
• Duration of simulation: 50 – 400 seconds
– For very large networks, a simulation for 59 secs can take a
day
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Current Situation
• Modern EMTP-type packages include multiphase loadflow solvers
• By comparison, PSS/E does electromechanical transients and
steady-state
– EMTP can do the same, but with much higher precision. It simulates and
finds the waveforms (exact) and includes harmonics
– PSS/E will find phasors but does not include harmonics
• Current Situation
– There are no portability standards between applications in the
same field
– CIM: needs to be augmented to include EMTP attributes
Importance of Portability
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UML, XML, DTD, RDF, CIM/CPSM
• Unified Modeling Language
– Defines notation and semantics for object-oriented models
– Graphical representation
• XML: eXtensible Markup Language
• DTD: Document Type Definition
• Resource Description Framework
– IEC 61970-501: XML format for network model exchanges using
RDF
– CIM/XML: Translated into XML using the relational RDF syntax to
describe instances of CIM objects and their relationships
• CPSM: Common Power System Model (IEC 61970-452)
– XML data file transfer requirements, subset of classes
– Adopted by NERC: standard for TSO data exchange
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CIM/EMTP-RV
• Translation to a proprietary format
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Topological data
Unique identifiers for devices
Device data
Specific model issues
Validation
Elimination of useless data for simulation
• Example: Extra breakers
• Usage of CIM/CPSM for filtering data
– Object mapping
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ACLineSegment: PI-section
ShuntCompensator: RLC
EnergyConsumer: PQ load
GeneratingUnits and SynchronousMachines: PV, PQ or slack
– Graphical presentation
• Automatic drawing, positioning, positional data
• Various presentation aspects
• New requirements for existing applications
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Challenges
• EMTP-type models are complex
• There are more differences between solution and modeling
methods from various software vendors
• There is a strong requirement from vendors and users to
maintain Graphical User Interface visualization of networks
– The new standard must develop GUI portability
– The GUIs are complex
• CIM-XML or just XML?
– Establishing a new XML standard from scratch will simplify the
standardization path.
– Compatibility with CIM has many advantages: established
standard, exchanging with traditional power system software
packages, visibility
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