Operation Planning Voltage Stability Security Assessment (Quarterly, Monthly, Weekly)

Overview
The Batch Contingency Simulation and the Comprehensive P-V Assessment and Comprehensive V-Q Assessment will be computed for the ISO, Transmission Operator or Utility. Thermal and voltage security assessment is also provided.

Required Information
  • Contingencies that cause voltage instability
  • Loadpockets that experience voltage instability and the contingencies that cause voltage instability on each load pocket
  • Contingencies that almost produce voltage instability
  • Areas that almost experience voltage instability for these contingencies
  • Subset of contingencies that almost produce voltage instability for each area
  • Reactive margins, import margins, reactive reserve margins, and critical voltages for each loading pattern and level, each transfer pattern and level, and power factor changes, and generation response changes to mismatch changes for peak load conditions
  • Operation planning mitigation measures such as unit commitment, voltage rescheduling, active rescheduling, etc that can be undertaken when peak load conditions or contingencies have stressed the system
Methodology

    The reactive margins, import margins, reactive reserve margins, and critical voltages for each loading pattern and level, each transfer pattern and level, and power factor changes, and generation response changes to mismatch changes would be obtained for each contingency affecting each loadpocket using P-V and V-Q methods using the peak load for that specific time interval, the outages of equipment that have taken place and were not anticipate in the yearly assessment that have stressed the current operating condition. The Operation Planning should attempt to determine if the system and the Under Voltage Load Shedding, Capacitor Protection System, and Motor Tripping Protection systems are adequate and if additional or different remedial operation planning action such as unit commitment, voltage rescheduling, active rescheduling, capacitor switching actions are needed that were not anticipated in the yearly assessment.