Application of rate of change of frequency constraints for high wind penetration scenarios in a small power system

The Tasmanian transmission network is owned and operated by Transend Networks Pty Ltd and is connected to mainland Australia through the Basslink HVDC interconnector. The increasing amount of non-synchronous generation supplying the Tasmanian load has resulted in the need to re-evaluate network security risks due to the changes in system dynamic behaviour. Following certain network contingencies, rates of change of system frequency may breach particular limits resulting in the loss of generation and/or activation of the existing under frequency load shedding scheme. Appropriate limit advice and constraint equations are required to operate the power system securely. This paper describes the studies and methodology used in constructing limit advice as defined by the boundary conditions of the system.