Dynamic equivalencing of active distribution networks for system security assessment  

Supervisors 

Dr. Mehdi Ghazavi Dozein (Monash University) 

The project 

Environmental concerns continue to drive the transition from conventional generation units to Inverter-Based Resources (IBRs), such as photovoltaic (PV) systems and other distributed energy resources. A significant share of these IBRs connects at low/medium voltage levels, increasing the complexity of distribution networks. These evolving Active Distribution Networks (ADNs) are expected to have a growing impact on overall power system stability and dynamic performance. This trend is particularly evident in Australia, where distributed PV capacity has surged in recent years and is projected to continue rising, progressively replacing traditional synchronous generation.  

At the same time, the transmission grid is experiencing a decline in inertia and challenges with system strength, leading to voltage/frequency stability risks and amplifying the influence of ADNs on power system behaviour during contingencies and faults. This PhD project aims to develop dynamic equivalent models of active distribution networks suitable for combined transmission-distribution system stability studies. Such modelling foundations and simulation tools give greater confidence to system operators in managing power system security under high penetrations of distributed energy resources.