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Portable Data and Modeling for Electromagnetic Transient Analysis programs

Portable Data and Modeling for Electromagnetic Transient Analysis programs. Jean Mahseredjian jeanm@polymtl.ca Ecole Polytechnique de Montreal. New IEEE Task Force. Co-chairmen: Jean Mahseredjian and Taku Noda Portable Data and Modeling for Electromagnetic Transient Analysis programs

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Portable Data and Modeling for Electromagnetic Transient Analysis programs

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  1. Portable Data and Modeling for Electromagnetic Transient Analysis programs Jean Mahseredjian jeanm@polymtl.ca Ecole Polytechnique de Montreal

  2. 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 (EMTP-type 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)

  3. Subject • Simulation and analysis of power system transients • EMTP-type applications: • 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

  4. Current Situation • Modern EMTP-type packages include multiphase load-flow 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

  5. Importance of Portability • Model reusability • Increased productivity: industry and research • Benefiting from the advantages of various applications • Example: same design for offline and real-time simulations • Example: controller design, controller simulation • Single model design: plug-and-play models • Same model for several frequency ranges • From load-flow to transients (electromechanical, electromagnetic, mean-value models, manufacturer codes) • Codes for control systems • Codes for power devices or complete systems with controls • Futuristic: plug-and-play and drag-and-drop

  6. 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 6

  7. CIM/EMTP-RV • Translation to a proprietary format • 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 • 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 7

  8. 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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