One of the more interesting studies to carry out during power system analysis are those associated with power system dynamics and studies. These are some of the more complicated studies that we carry out and are time based simulations to see how a system responds to a disturbance over a finite time period – usually anything from a few milliseconds to perhaps 30s.
Dynamic and Stability studies are usually associated with classical synchronous machines. They are used to assess a variety of scenarios such as transient faults, critical clearing times, load acceptance and rejection, dynamic motor starting and the need for Power System Stabilisers (PSS). But with G99 / Grid code they are also associated with studies such as Fault Ride Through, Frequency Response (LFSM / FSM) and QV voltage control studies.
These type of studies are usually carried out as Root Mean Square (RMS) time based simulation and need accurate information on the synchronous machine, along with its various controllers such as the governor, AVR / Exciter and any OEL / UEL or PSS equipment present. They are also used to parameterise various inverter controllers for solar, battery storage and wind sites where the inverter controls need to be set and configured to meet the various performance requirements of the TSO.
In more recent years there has been a move away from RMS stability studies to consider stability as an Electromagnetic Transient (EMT) based phenomena, which considers the interaction between control systems of inverters and classical synchronous machines.
The studies carried out for G99 / Grid Code compliance are a small subset of these types of studies. Where they get really interesting is in modelling of complete networks (large scale grids or microgrids) where aspects of frequency stability, voltage stability and small signal stability need considering. Typical Studies include:
- Dynamic Studies
- Transient Studies
- Grid Code / G99 Studies
- Synchronous Machine operation and response
- AVR/Exciter configuration and tuning
- Governor configuration and tuning
- PSS tuning (difficult!)
Aurora can help in a variety of these studies – if you would like to know more please get in touch.
