Transient Stability (TS) – Powerful Dynamic Simulation Tool

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POM – Transient Stability (TS) is a fast, comprehensive dynamic simulation tool. Fully integrated into POM Suite, TS is designed to determine the transient stability limits after any disturbance is applied to a power system network of any practical dimensions. TS allows the user to compute transient stability limits during massive contingency analysis. The contingency analysis results may then be checked against planning and/or operational criteria such as the value of a voltage dip after fault clearing, duration of a voltage dip, post-transient voltage deviation and frequency deviation.

All TS functions are directly accessible from the main POM application interface. Both dynamic and steady-state parameters are listed in the interface. Any system quantities may be selected as an output and can be displayed graphically. TS simulates short-term, mid-term, and long-term stability events. The application uses variable time step techniques without loss in accuracy of results.

TS offers the capability to simulate balanced and unbalanced faults:

  • Three-phase, double line-to-ground, line-to-ground, line-to-line faults may be simulated.
  • Critical clearing time is easily determined depending on fault locations.
  • Simultaneous events at multiple buses or points along a transmission line may be simulated.
  • Any sequence of switching events may be specified within the same simulation run.

TS works in interactive and automatic modes. It allows users to perform the massive fault analysis using conventional time-domain simulation, while monitoring the various performance criteria. TS delivers reliability and speed, while providing a user-friendly, easy-to-use transient stability analysis tool for planning and operations environments.

Fast Fault Screening (FFS) Capability

TS features a unique capability to automatically identify the most dangerous fault locations out of all possible faults in the system, and perform the ranking of those faults in on-line and off-line environments. That feature is called Fast Fault Screening (FFS).

Critical Clearing Time (CCT) Capability

TS includes an automated prebuilt calculation of critical clearing time through the Critical Clearing Time (CCT) capability.

Dynamic Security Region

When the simultaneous transfers are being modeled, TS offers the capability to compute the Dynamic Security Region using BOR-TS application. POM Suite characterizes the security of a power system in terms of the power injections (load demand and generation).The system is considered to be secure under such operating conditions (such sets of injections) when no steady-state or transient stability constraints are being violated. That is defined as the Dynamic Security Region of a power system.

Dynamic models

TS supports the library of dynamic models in GE’s PSLF and Siemens PTI’s PSS/E formats. It allows for an easy inclusion of the user-defined models using POM scripting features without the need for any external compilers.

TS Output

The graphical capabilities of TS include:

  • Easy plotting of various electrical parameters versus time.
  • Plotting of multiple parameters versus time within the same plot.
  • Ability to easily save the plots in a wide variety of graphics formats.
  • Visualization of the process on a geographical map (natively integrated with Google Maps).

Tabular output of TS includes:

  • Database output
  • Easy and simple exporting of data to Microsoft Excel

Performance Criteria

TS offers flexibility in specifying the performance criteria. All of the criteria are user-specified. Different sets of limits may be specified for different categories of the planning events.

TS has the capability to simultaneously monitor multiple criteria during the massive fault analysis, such as:

  • Rotor angle
  • Damping
  • Voltage dip