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Resource Data Needed For Dynamic Simulations

Resource Data Needed For Dynamic Simulations. And the problems created by incorrect or incomplete data. Importance of Accurate Modeling. Source: BPA Presentation to NERC Planning Committee, Dec. 7, 2010. Importance of Accurate Modeling.

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Resource Data Needed For Dynamic Simulations

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  1. Resource Data Needed For Dynamic Simulations And the problems created by incorrect or incomplete data

  2. Importance of Accurate Modeling Source: BPA Presentation to NERC Planning Committee, Dec. 7, 2010

  3. Importance of Accurate Modeling Source: Transmission Research Colloquium Sacramento, CA September 11, 2008

  4. Importance of Acc Modeling Source: Transmission Research Colloquium Sacramento, CA September 11, 2008

  5. Generator Modeling in Dynamics • Stability Studies are interested in calculating the response of machines connected to the system in three time frames following an event: • Sub-transient – a few cycles • Transient – a few cycles to several seconds • Steady State

  6. Generator Modeling in Dynamics • Pmax, Pmin, Qmax, Qmin • MVA BASE and Zsource • Unsaturated Sub-transient Reactance • Dynamic Models and Parameters • Transformer (GSU) Data • Collection System Data • Under/Over Voltage set points • Under/Over Frequency set points

  7. Resource Asset Registration Form

  8. Generator Data In PSSE • Pmax, Pmin, Qmax, Qmin, Mbase, Rsource and Xsource values in PSSE

  9. MVA Base Transmission line parameters MVABASE = 100 MVA Transformers and Machines may use MVA Rating Arbitrary Per Unit Values need to be Accompanied by their MVABASE and kVBASE Base values

  10. Generator Model in PSSE

  11. Generator Model in PSSE The magnitude and phase of the source current are determined at any instant as a function of the instantaneous values of generator state variables (i.e., rotor circuit flux linkages, shaft speed, and rotor angle).

  12. Dynamic Impact of increased QMAX and MBASE values • Larger QMAX and MBASE values suggest more dynamic reactive compensation from a generator is available for system voltage recovery contribution. • Study results will be overly optimistic and will mask system dynamic voltage issues. • MBASE values are a source of reference for calculation many generator dynamic model parameters • Unit inertia (H constant) = • Generator impedances • Exciter and Governor limits

  13. Dynamic Impact of increased QMAX and MBASE values CenterPoint Energy System dynamic bus voltages after a large disturbance Larger QMAX and MBASE data from current RARF Actual QMAX and MBASE data Results in 0 MW of Under Voltage Load Shedding Results in 3824 MW of Under Voltage Load Shedding

  14. Generator Dynamic VAR output example

  15. Resource Asset Registration Form

  16. What is Saturation • Saturation is the state reached when an increase in applied external magnetizing field H cannot increase the magnetization of the material further, so the total magnetic field B levels off. • The flux linkages in a synchronous machine are primarily through air and are not significantly affected by saturation. • Generator models recognize that the extent of the saturation effect depends upon both rotor (field) and stator currents. • Accordingly, the models derive the effective saturated parameters of the machine at each instant by internal calculation from the specified (constant) unsaturated values of machine reactances and the instantaneous internal flux level. • The user should enter unsaturated values of all machine reactances in setting up Dynamics data for simulation, and must enter an appropriate set of open-circuit magnetization curve data for each machine.

  17. What is Saturation • Straight line is the “air-gap line” used to determine the field voltage/current. • Curved line is an indication of the degree of saturation. • Equations here can be used to provide data • Saturation Factors needed in Model data

  18. Typical Models for a Conventional Generator Gov. Gov. Gen Gov. Exciter

  19. Sample Model Data Sheets

  20. Sample Model Data Sheets

  21. Sample Model Data Sheets

  22. Generator Data • Additional Data Needed- • User Models need application notes for models; • data sheets • dyr files

  23. Protection Tabs Undervoltage and Overvoltage

  24. Protection Tabs Under-frequency and Over-frequency

  25. Additional Information

  26. Maintaining Data Critical • Upgrades • Exciters • Turbine • Stabilizer additions • Reactive devices (Caps, Reactors, D-Vars, SVCs) • New • Preliminary to Commissioning • Generator tests should provide the data needed to update the appropriate data sheets. • Some Resource Owners are providing detailed engineering reports containing the model parameters and test data used to establish the parameters.

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