Dynamic Stability Features

Models

• Generator Models
  • Round rotor full sub-transient flux detail synchronous generator model with saturation
  • Salient pole full sub-transient flux detail synchronous generator model with saturation
• Excitation System Models
  • Simple, single time constant excitation system
  • IEEE Type AC1A, AC6A, AC8B brushless excitation system
  • IEEE Type 1 and IEEE Type 2 excitation system
  • Fast, medium and slow response tunings in library
• Governor System Models
  • Steam turbine, gas turbine, and Woodward diesel systems
  • Fast, medium and slow response tunings in library
• Motor Models
  • Induction double-cage, full sub-transient, flux detail model with saturation
  • Synchronous salient-pole, full sub-transient flux detail model with saturation
  • Induction flux motor model includes option for additional stator flux dynamics
  • Includes modeling of starting and running loads, and auto-transfer of load
  • Synchronous motor includes field application at defined speed
• Motor Load Models
  • Torque as a function of speed squared or cubed
  • Torque vs. speed as a digitized load model function
• Detailed Model Library
  • Use our supplied data “as is” to do quick checks for a typical system
  • Add your own model data for your system, and future analysis
  • Organize data in user-specified categories for quick locate and import
  • Data sets: over 70 complete model examples
• Network Model
  • Uses EasyPower’s network model already defined in your database
  • Performs a constant impedance network analysis
  • Auto-transformer tap operation suppressed
  • Utilities modeled as short circuit impedance sources (infinite inertia)
  • All static loads modeled as constant impedance
  • Resolves network to update conditions for changes in induction motor vars, based on requirements of machine equations at initialization
  • While in Dynamic Stability focus, system can be changed via breaker operations (right mouse click on breaker) and power flow initial conditions resolved before a simulation

Simulation

• Start any single motor, including automatic changes from starting to running load
• Start entire group of motors via breaker operation
• Integrated with Scenario Manager™ for quick simulation of various alternatives
• Modify automatic double-click controls (simulation length, time of action, etc.) to fit your simulation needs
• Suppress message log as desired with three categories: initialization, runtime, and protective device action messages
• Modify simulation time step to suit simulation needs
• Enable/disable all automatic contactor, protective device, and ATS (automatic transfer switch) actions
• Specify plot length by number of points
• Automatically copies results to Windows® clipboard for use in any spreadsheet

Fast Double-Click Functionality

• Open/close/simulate any switching devices
• Bus fault/simulate any bus
• Transfer/simulate any ATS
• Step/simulate any generator for open circuit step test
• Step/simulate any generator for governor load step test

Protective Device Functionality

• Includes protective device actions for all devices already defined in database
• Adds automatic contactor dropout functionality
• Adds ATS auto-switching functionality
• Protective device actions can be easily included or excluded from a simulation with a single option setting

Scripting Engine

• Define a script to perform any type of simulation action in time
• Allows open/close of any breaker and transfer of any ATS
• Includes fault application impedance and duration
• Includes “Run To” and “Run For” time features
• Start, trip, and re-close any motor or group of motors
• Create complete motor-sequencing simulation
• Perform reduced voltage starts via network changes

One-line Integration

• Display of one-line at initial condition upon entry to Dynamic Stability focus
• Display of system conditions at end of simulation
• Display of system conditions at any point, using simulation step feature
• Graphical symbol morphing to indicated inclusion of stability data

Plotting

• Includes up to 10 plots, 5 traces per plot, of model and network items
• Monitor motor: terminal voltage, current, watts, and vars; electrical and load torque; speed; and power angle
• Monitor synchronous machine: terminal voltage current, watts, and vars; speed; electrical torque; mechanical power; field voltage; angle; power angle; D-Axis current; Q-Axis current; D-Axis sub-transient flux; Q-Axis sub-transient flux
• Monitor bus: voltage, angle, frequency, and fault current
• Monitor network branch and shunt device: kW, kVar, amps, voltage
• Plot definitions use quick and intuitive equipment selection right off the one-line

Detailed Message Log

• Detailed message log tracks all system behavior at initialization and runtime
• Initialization messages help you quickly debug an ill-defined system model or data
• Run-time messages show all script actions and automatic switching actions
• Run-time messages show protective device pickup, reset, trip and lockout actions

Model Data Sheets

• Model data sheets can be quickly printed
• Print a single model, or an entire group of equipment items with quick one-line select
• Exciter and governor data sheets include graphic of model block diagram

Built-In Automatic Control

• Automatic detection of numerical instability, allowing quick system reset
• Automatic internal model sub-integration to minimize numerical instability issues at typical simulation time steps
• Improved modified Euler integration technique
• Simulation of stator flux transients (dψ/dt terms) using differential instead of integral technique, eliminating numerical instability issues in the motor’s fast time constant stator equations at normal time steps (half to quarter cycle)
• Detailed data checking of parameters when entering in the database
• Automatic detection of invalid or insolvable system power flow when entering Dynamic Stability focus

Control Interface

• Easy-to-use dynamics focus toolbar with fewer buttons but more capabilities
• Select scripts to run simulations directly from a drop-down list in the toolbar
• Pause any simulation for termination
• Restart any paused simulation
• Reset to initial conditions at any time during simulation
• Enable/disable results on the one-line view just like in power flow focus

Induction Motor Parameter Derivation

• Induction motor parameter derivation tool that lets you determine detailed flux model parameters using your running and starting conditions, and your machine torque speed curve
• Automatic minimization technique used to locate best parameters to match your data
• Gravity points help to pull the derivation towards your desired curve
• Integrated digitizer with spline curves allows overlay of a quick drawing of torque speed curve over a scanned image of actual data
• With one mouse click, import the derived data directly into your database
• Easily copy your derived data into the user library

EasyPower Dynamic Stability requires PowerFlow™ and Transient Motor Starting to operate, and Protection & Coordination™ for all protective device simulations.

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