Title: Challenges and Solutions for Protection System in Power System with Inverter-based Resources
Speaker:
Francisco M. Gonzalez-Longatt
Professor, Department of Electrical Engineering, Information Technology and Cybernetics
University of South-Eastern Norway (USN), Norway
Abstract:
The transition to a net-zero energy system requires a massive change in how electricity is produced, transported and used; the power electronic converters are the core of this paradigm-shifting, and the control techniques used on them have a primary influence in the power system dynamic behaviour. It is well documented that the power of electronic converter-based resources has created new challenges from the protection system perspective. One of the challenges from the protection point of view is coming from the signature of the output current of inverter-based resource (IBR) during short circuit conditions. It differs from traditional rotational electrical machines during a short circuit. The semiconductor switching devices of the power electronic converter are intolerant to overcurrents, so the short circuit current contribution is limited to avoid damage to the switching devices, and during this limited operation, the output waveform can be nonsinusoidal. Additionally, the dynamic response of the PEC during fault conditions is highly dependent on the IBR programming, impacting the voltage and current relationship at the point of connection. The IBR’s peculiar features affect its performance during fault conditions and the protection system at transmission and distribution. This keynote starts with an introduction of the IBR characteristics and control strategy, as well as consideration of the pre-faults performance and time frame after the fault. Discussion about the IBR transient rating and the protection are presented. The keynote is intended to present details of the challenges of traditional protection systems at the transmission and distribution level caused by the integration of IBR. The effects of the IBR performance of the protection are presented: traditional line protection scheme, traditional directional and non-directional overcurrent protection schemes, and negative and zero polarised directional protection. Off-line and real-time simulations are used to present the challenges. The keynote closes by presenting a comprehensive set of proposed solutions to increase the performance of the protection systems in power systems with high penetration of IBR.
Speaker’s Biography:
Francisco M. Gonzalez-Longatt is currently a professor in electrical power engineering and Founder and leader of the DIgEnSys-Lab (Digital Energy Systems Laboratory) at the Department of Electrical Engineering, Information Technology and Cybernetics, University of South-Eastern Norway (USN), Norway. He is currently a Senior Lecturer in Electrical Power Systems at Wolfson School of Mechanical, Electrical and Manufacturing Engineering and a member of the Centre for Renewable Energy Systems Technology (CREST) at Loughborough University, UK.
His main area of interest is empowering energy systems’ secure and resilient operation by taking advantage of digital technologies. His research is or has been supported by the Royal Society, British Council, UK India Education Research Initiative (UKIERI) –UK and USN in Norway. He is the author or editor of several books (Spanish and English). He has written 30+ book chapters, 60+ journal and magazine papers and 100+ conference papers.