Transient stability simulation is designed to simulate electromechanical transients due to a large disturbance (Dynamic Event) or a sequence of such events in electric power systems. This reference manual presents InterPSS transient stability simulation dynamic event implementation technical details. Please refer to the InterPSS Transient Stability User Guide for information regarding how to define these dynamic events for a transient stability simulation run.
InterPSS currently supports two types of generic dynamic events:
InterPSS dynamic event can be defined as temporary or permanent.
By combination of these basic events, you can simulate more complex events. As shown in the following dynamic event edit panel, you can click the AddEvent button to add more events to your study case.
Change Event includes bus fault, branch fault, and branch outage. These kind events normally result in large disturbance to the operation of power system. You can define multiple such events in a simulation case, such as a branch fault followed by a branch outage to clear the fault. Please note: currently InterPSS core library can handle only one unsymmetrical fault at any simulation point.
Bus Fault is used to describe a dynamic event when a fault occurred at a bus and cause a large disturbance. The fault is cleared automatically after last for the duration, if it is not permanent.
Please refer to the InterPSS Short Circuit User Guide for more detailed information regarding how to define a bus fault.
Branch Fault is used to describe a dynamic event when a fault occurred at a branch and cause a large disturbance. The fault is cleared automatically after last for the duration, if it is not permanent.
Please refer to the InterPSS Short Circuit User Guide for more detailed information regarding how to define a branch fault.
You can define a branch outage event, for example, to isolate a permanent bus or branch fault. You can also simulate a scheduled branch outage for line or transformer maintenance.
Select a branch and branch outage starting time. Branch outage is always permanent. Currently only three-phase branch outage is supported
Adjustment event is for describing auxiliary actions such as Load change, controller set point change.
You can specify load change at a bus. The change factor in percent is with regarding to the bus initial load. The change could be at a fixed time, or trigged by low bus frequency or bus voltage. For low frequency change and low voltage change, a delay time in sec could be specified.
Some time you might want make a step change to the set point or reference point of a controller to verify if parameters of the controller have been entered correctly. When you select the Disable Dynamic Events checkbox, the Controller SetPoint Change area will be enabled to allow you to define a controller set point change event.