Sensitivity studies and calibration of small signal models

Inter-connectors are strategically important elements in the power system for their role in bulk power transfer between different areas. The dynamic performance of the interconnector is relatively less certain due to modelling complexity and difficulty in testing, despite its importance to power system security. This paper firstly presents the calibration result of the small signal power system dynamic models of the Australian National Electricity Market (NEM), using the field test measurements of SVC Power Oscillation Dampers in Queensland. Based on the calibrated models, the sensitivities of a number of parameters to system damping are evaluated. The results show that apart from the generator PSS design, the inter-area mode damping is also significantly influenced by the modelling of loads, generator (inertia in particular) and governor.