Keynote: Optimal Voltage Ride-Through of IBR-Dominated Power Systems (slides)

With the increasing penetration of inverter-based resources (IBRs), disconnecting IBRs from the system, at first sign of trouble, could exacerbate system instability under large voltage disturbances (sag, swell and unbalance).

Several large blackouts or interruption events in relation to the improper operation of IBRs under voltage disturbances have been reported in recent years. Although a consensus has been reached that IBRs should be able to ride through various voltage disturbances while providing dynamic voltage support (DVS) to the grid, it is still not clear how to achieve the optimal DVS.

This talk will share our recent research efforts in improving the DVS performance of IBRs under abnormal voltage conditions. Three critical questions are answered via optimisation.

1) What is the maximum DVS capability of a single IBR?
2) How to implement the maximum DVS without relying on the knowledge of grid model parameters?
3) How do multiple IBRs interact with each other in a network? The optimisation-based methodologies open up an effective way to explore sophisticated control strategies of IBRs under large disturbances, and the research findings complement and even challenge our physical intuition.