System security and reliabilityProject Powerlink Cost-Effective System Strength Study
This is the third and final report as part of Powerlink’s study into the cost effective management of system strength.
This report is the third and final report as part of the ARENA supported Powerlink study into the cost effective management of system strength, and builds on these prior reports:
- The first report, Managing System Strength During the Transition to Renewables, provides an overview of the role of system strength in the power system, the issues encountered as system strength is reduced, and the full range of responses which are available. This report also included analysis into the merits of a centralised approach to addressing low system strength across an area versus a model in which each renewable generating proponent implements their own solution
- The second report, Assessment of the Effectiveness of a Centralised Synchronous Condenser Approach, demonstrated and quantified the effectiveness of a synchronous condenser option to facilitate the connection of inverter based renewables in an area of the power system with low system strength. This analysis was based on detailed PSCAD analysis, as would be undertaken for a connection assessment, and provided explanations of the various issues which were encountered
- This report demonstrates and quantifies the effectiveness of grid forming inverters (GFMIs) with battery solution (henceforth referred to as a ‘grid forming battery’). It is based on the same situation and uses the same analytical techniques as the second report, to allow for comparison. Suppliers of grid forming batteries were invited to submit a PSCAD model for potential use in the study. However, because of the very detailed and time consuming nature of PSCAD modelling, only one model was taken forward to the detailed analysis. As a courtesy to all vendors, the details of the model which was assessed, will not be published. The decision on which model to take forward for detailed analysis was based on which model was felt to be most likely to yield positive results. It should not be assumed that the results of this study can automatically be applied to all grid forming batteries in all situations. Rather, specific analysis is required.