GC0168: Submission of Electro Magnetic Transient (EMT) Models

As Great Britain’s (GB) power system moves towards a net zero carbon operation; the number of Inverter-Based Resources (IBR) is expected to increase, with the amount of synchronous generation in the grid to decline which will significantly change the characteristics of the GB network. These changes give rise to the potential control interactions between the devices across the network leading to risks of oscillations and inverter stability. This modification seeks to require certain Users to provide the ESO with EMT models to enable analyses such as system oscillation, inverter stability and Transient Over Voltage (ToV).