Stability Analysis Functions
RMS Simulation with a-b-c Phase Representation
The a-b-c phase, steady-state component representation of the power system, features the fundamental frequency analysis of any asymmetrical grid operation condition.
- Initialization via balanced or unbalanced power flow
- Simulation of unbalanced loading conditions in 1-, 2- and 3-phase AC and DC systems
- Simulation of any number and combination of unbalanced faults including single- and double-phase line interruptions
- The a-b-c phase system representation mode avoids tedious hand-calculations of equivalent fault impedance
- It also allows for accessing any a-b-c phase quantity for plotting or precise modelling purposes (e.g. protection devices)
Long-term Stability
In many cases stability calculations must be run for long periods thus taking into account effects of slower control systems such as boiler control, network exchange control or transformer tap-changer control. Other applications are varying loads or applications of wind power where the impact of wind speed fluctuations must be analyzed. In such cases, short-term and mid-term dynamics have already reached steady-state but slower transients are still being observed.
- Long-term stability simulations based on adaptive step-size algorithms with accuracy-controlled step-size adaptation ranging from milliseconds to several minutes without any decrease in precision or even manipulation of transient behaviour.
- A-stable simulation algorithm which fully covers fast transients as well as slow, semi steady-state dynamics with high-precision event handling (stiff systems).
Typical Applications
- Voltage stability analysis considering effects of load variations, tap-changer control and reactive power limits
- Long-term flicker analysis in cases such as fluctuating renewable generation or varying loads
- Secondary control analysis and optimization
