Australian Research for Global Power System Transformation (Stage 2) Topic 1

  • Bahrani, Behrooz (Primary Chief Investigator (PCI))
  • Ravanji, Mohammad (Chief Investigator (CI))
  • Leonardi, Bruno (Partner Investigator (PI))
  • Ramasubramanian, Deepak (Partner Investigator (PI))
  • Ma, Jin (Chief Investigator (CI))

Project: Research

Project Details

Project Description

The Australian National Electricity Market (NEM) is in a rapid transition towards an inverter-dominated system as the majority of synchronous generators (SGs) are retired and displaced by inverter-based resources (IBRs), such as wind, solar photovoltaic (PV), and battery storage over the next two decades. Currently, most IBRs in the NEM are grid-following inverters (GFLIs) that rely on other grid resources to set their frequency. With increasing the penetration of IBRs, alternative inverter control methods such as grid-forming inverters (GFMIs) are necessary to achieve a stable IBR-dominated grid. Grid-forming controlled battery energy storage systems (GFM-BESSs) are examples of such IBRs that are already being installed in several locations in the NEM, and it is expected their share will increase in the near future. Development of these methods requires various studies and exploration of appropriate control strategies for IBR-dominated grids. For instance, owing to the fast control schemes employed in power electronic converters, their limited overload capabilities and reduced inertia, the response of IBRs during and subsequent to the grid faults is completely different from that of SGs. As a result, the transient voltage angle behaviour of IBRs and their transient stability are different from the SGs, and consequently, their enhancement methods would be different.
In this research proposal, the focus is on the transient stability of grid-tied IBR farms and the role of incorporating lumped/distributed GFM-BESSs on their transient stability margin. To this end, first, a thorough literature review on transient stability analysis and enhancement methods is performed, and aiming at identifying the shortcomings of the existing control configurations, transient stability studies of a typical grid-tied IBR farm (for both GFLIs and GFMIs) are surveyed, and application of the available stability enhancement methods are investigated. In the next step, the desired behaviour of an IBR farm during and subsequent to a fault is defined. In the next steps, transient stability studies and enhancements are performed for IBR farms with various configurations. To this end, first, the transient stability of a farm comprising a combination of a single GFLI and a single GFMI connected to the grid, representing a grid-tied GFLI-based PV farm equipped with a GFM-BESS is studied, and then these studies are expanded for a farm comprising a combination of multi GFLIs and multi GFMIs connected to the grid through a reticulation system, representing a grid-tied multi-clustered wind farm equipped with a distributed GFM-BESS. Finally, all of these studies are repeated for an IBR-dominated region of a grid in the presence of other assets such as SynCons and loads.
The defined tasks, required resources, and estimated timeframe for each task are provided in Table I. For this project one PhD student and one PostDoc researcher are required. The PostDoc researcher leads Tasks 1-3 while the PhD student supports him/her, and it is expected that these tasks are completed within a year. Tasks 4-5 will be led by the PhD student within the next two and a quarter years as part of his/her PhD stream.
StatusFinished
Effective start/end date20/05/2215/05/23

Funding

  • CSIRO - Commonwealth Scientific and Industrial Research Organisation: A$363,635.45