HVDC control and protection systems are complex systems to model and may include black-box models. This can make the models difficult to maintain and can lead to long computation times. The complexity and difficulty in maintaining the models inevitably leads to differences between the modelled controllers and the actual controllers in the field.
The National HVDC Centre will use replica hardware of HVDC schemes. Replicas are a direct copy of the control and protection systems used. Using replicas allows the actual controls to be implemented into the simulations, removing a major source of modelling uncertainty.
This facilitates complex studies where accuracy is critical, and provides an opportunity to improve and validate the controllers. Having HVDC control and protection replica’s allows control changes to be first tested in a safe environment before being rolled out in the field.