School of
Information Technology and Electrical Engineering

Speaker: Awan Krismanto
Seminar Date: Wed, 22/11/2017 - 11:00
Venue: 78-621
Host: Assoc Prof Mithulan Nadarajah; Dr Olav Krause

Seminar Type:  PhD Thesis Review


A Micro-Grid (MG) can be defined as a miniature power system that consists of loads and generating units with or without energy storage devices. MG can be operated in a controlled and coordinated manner to bring a wide variety of technical and economic benefits, either while tied to the main power network or isolated from the grid. Though MG allows seamless integration of renewable energy resources (RES), reduces losses and enhances the reliability of electricity supply, it brings new instability challenges to the operation of the entire power network.

This research investigated the small signal stability performance of MG during islanding and grid-connected operation. A comprehensive model of RES based DG units in MG was developed to obtain a complete picture of MG dynamic response and small signal stability performance. Moreover, in grid-connected operation, it was observed that increasing MG penetration influences the low-frequency oscillatory modes of the power system. Possible interaction events between sensitive modes inside and outside MG under islanding and grid-connected operations were observed. The monitored modal interaction events were evaluated using three proposed identification methods; eigen-trajectories, cross-participation factor and novel Modal Interaction Index. Small signal stability performance of MG under autonomous and grid-connected operation was further analysed by considering uncertainties of RES such as uncertainties of wind speed and solar irradiance. Monte Carlo and Copula methods were applied to determine the probability density function of the RES. The statistical analysis was conducted to evaluate the MG small signal stability under RES uncertainties. Based on the proposed MG models, the small signal stability issues were analysed and their qualitative link with uncertainties in RES and loads are studied. The obtained results can be used as design consideration and stability margin prediction of MG system.


Awan Uji Krismanto was born in Malang, Indonesia. He completed his B.Sc. and M.Sc. in Electrical Engineering from Brawijaya University and Sepuluh Nopember Institute of Technology (ITS), Indonesia in 2004 and 2010 respectively. He served as a faculty member in the Department of Electrical Engineering National Institute of Technology (ITN) Malang, Indonesia from 2005. Currently, he is a PhD student in the Power & energy Systems Research Division at the School of Information Technology and Electrical Engineering, The University of Queensland, Australia. His research interests include power electronics, distributed generation, microgrid and stability in power system.