A collaborative research group is being established, made up of utilities, manufacturers and research bodies, to investigate the electromagnetic transient (EMT) interaction of renewable generation on transmission equipment. The focus of the project will be on the EMT modelling of components (transformers, cables, circuit breakers, instrument transformers etc.) to provide best practice and expert opinion on their interaction with the power system.
System and plant measurements will be carried out to validate the models, which can then be used to simulate and demonstrate the power system interaction phenomena on equipment such as current inrush, harmonic penetration, resonant overvoltages, etc. The work will consider transformer modelling (both in terms of modelling expertise and laboratory facilities), and acquiring cable lengths for the purpose of model validation (complex multi-phase cables with steel armouring). In addition, a number of system studies will be performed in order to highlight special transient phenomena such as how CT/VT saturation may impact on protection performance.
Participants will highlight their interests, for instance, EdF want to compare case studies using PSCAD and EMTP-RV packages, Statkraft would like an activity on modelling oil-filled cables, Vestas is very interested in black-box cable modelling, etc.
A desired result of this project is to help facilitate the connection of £50bn of renewable generation (25GW) onto the network, through understanding the level and impact of transient voltages that will arise from these types of connections to renewable generation and designing solutions to mitigate or neutralise their occurrence. Failure to do this could, in the worst case, lead to substation equipment failure. The ability to provide a better-informed specification could possibly result in an avoided loss of supply through damaged cables or transformer resulting in £1-2m repairs.
The focus of the project will be on the Electro Magnetic Transient (EMT) modeling of components (transformers, cables, circuit breakers, instrument transformers etc.) to provide best practice and expert opinion on their interaction with the power system.