Voltage Stability Software

Voltage Stability

Voltage Stability Analysis

Voltage collapse is still the biggest single threat to the transmission system. It is generally characterized by loss of a stable operating point as well as by the deterioration of voltage levels in and around the electrical center of the region undergoing voltage collapse.
Voltage collapse, a form of voltage instability, commonly occurs as a result of reactive power deficiency. Unmitigated rotor angle instability can also result in voltage instability. Voltage stability is therefore the ability of power system to maintain steady voltages at all buses in the system after being subjected to a disturbance from a given initial operating condition.

The ETAP Voltage Stability module provides four typical methods for static voltage stability analysis of power systems: V-Q curves, P-V curves, V-Q sensitivity analysis and Q-V eigenvalue analysis (modal analysis).


Voltage Stability Software Key Features

  • Sensitivity Analysis
  • Modal Analysis (Eigenvalue Analysis)
  • PV QV Analysis or Continuation Load Flow Analysis
  • Automatically calculates
    • P-V curves
    • V-Q curves
    • dV/dQ self-sensitivities
    • dV/dQ mutual sensitivities
    • eigenvalues
    • eigenvectors
    • bus participation factors
    • branch participation factors
    • generator participation factors
  • Graphical results and plots: results can be visualized by the fully integrated graphical results manager

Voltage Stability Applications

  • Identify weak, unstable or uncontrollable areas
  • Identify weak and heavily loaded transmission branches
  • Identification of severe contingencies with zero or negative load margins
  • Reactive power reserve calculation
  • Utilize together with Optimal Capacitor Placement for proper distribution of reactive reserves on the distribution feeders or transmission substations in order to maintain an adequate voltage stability margin



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