ROSE Voltage Stability Analysis (VSA)

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Voltage stability is one of the fundamental concepts in power system stability analysis, and is essential for maintaining normal operation of today’s power systems. ROSE VSA is an online voltage stability tool, which is integrated with an EMS system of a utility and runs 24/7/365.

ROSE VSA is able to perform the following functions:

  • Accurately determine real and reactive power margins in real-time across a wide area and locally;
  • Identify, alert and alarm operators to locations and conditions where voltage is not presently within appropriate limits;
  • Using PV, QV, dV/dP, dV/dQ, alert and alarm to conditions where, based on current conditions and contingencies, voltage may experience collapse;
  • Identify limiting contingency(ies);
  • Display all of the above visually; and
  • Suggest actions that may be taken to address and mitigate identified voltage instability.

ROSE VSA has the capability to analyze one-dimensional and two-dimensional scenarios. ROSE reads state estimator data in node-breaker model (such as CIM/XML or “flat” file), or bus-branch model.

The software offers the flexibility to model very complex, real-time RAS.

One of the integrations of ROSE VSA with GE Grid Solution’s EMS system is shown below:

ROSE VSA is used for steady-state stability analysis as follows:

  • Utilizes node-breaker based SE case from EMS every five minutes
  • Runs multiple user-defined scenarios
  • Computations performed for each scenario are:
    • Determining interface limits
    • Performing PV-curve analysis
    • Performing QV -curve analysis
    • Determining pre- and post-contingency weakest buses
  • Visualizes results of voltage stability analysis
  • Archives input/output data
  • Issues alarms when the current system state in terms of interface flows is close to the limit

ROSE VSA works in two modes:

  • Real-time mode
  • Off-line mode

ROSE VSA offers customizable visualization of results for the control room. (Visualization used at Peak RC is shown below).

ROSE VSA engineering displays show details on voltage stability margins, critical contingencies and PV-curves and QV-curves.

ROSE VSA satisfies cybersecurity requirements.