Transient Motor Starting
The motor starting function makes use of the PowerFactory stability module by providing a pre-configured shortcut for easy-to-use motor starting analysis. The motor starting is initiated by just selecting the respective motors within the single line diagram and initiating the motor starting calculation via the appropriate mouse-click. A complete symmetrical or asymmetrical AC/DC load flow will be computed prior to the motor starting event, Pre-selected and pre-configured Virtual Instruments (VIs) are automatically created and scaled.
- Consideration of complex motor models with build-in parameter estimation fully covering high precision modeling effects. A comprehensive library of low voltage, medium voltage and high voltage motors is provided;
- Typical motors supported are: single- and double cage asynchronous machines, squirrel and slip-ring motors, double-fed induction machine, synchronous motors;
- Access of model library for of build-in motor driven machine characteristics with flexible user-modeling support;
- Support of various starting methods such as direct start, star-delta starting, variable rotor resistor, thyristor softstarter, transformer softstarter, variable speed drives, etc.; start from any rotational speed;
- Full representation of generators with exciter/AVR model support on basis of build-in models (e.g. IEEE models) as well as user-defined models via the DSL approach; consideration of protection devices such as under-voltage protection, over-current protection our automatic restarting relays (EMR) or transformer OLTC;
Compared to the more complex dynamic simulation approach, Transient Motor Starting simulation is performed by assuming constant grid frequency (prime mover dynamics are not considered). Consequently, in cases where grid frequency varies significantly, the Dynamic Simulation Functions must be used.