This project aims to address the limitations of current fault current calculation methods in power networks with high integration of inverter-based resources (IBR). Existing standards like IEC60909 and its adaptations do not adequately model IBR devices, leading to significant errors in fault current calculations. These inaccuracies can result in financial losses, equipment damage, and operational risks. To mitigate these issues, SPEN is partnering with eRoots, a company that has developed a new, patented method for accurate fault current calculation in IBR-dominated networks which has demonstrated substantial error reduction compared to traditional methods. The project will not only enhance the accuracy of fault current calculations but also foster informed discussions within the industry, potentially leading to updates in existing standards and improved network reliability. 

Benefits

The purpose of this research project is to identify the inefficiencies in the current methods of calculating fault current under the ER G74 standard and demonstrate if the standard could be updated to support TOs produce more accurate calculations. The new modelling method has been patented and results show that in a case where the penetration of IBR is 19.5%, an error exists between their method and the IEC60609. That error increases to 52.6% when the penetration of converters reaches 75%, which is like the case of the SPEN network. Similar results have been verified with the Texas power network. If that error were to be negated through a change of standard, which this project aims to drive, then overinvestment into electrical protection equipment could be reduced by up to 40% in SPEN and other TOs who use the IEC60609 methodology and have similar network topology.