Hybrid Frequency Domain Assessment for Networks with IBRs

This project aims to evaluate and verify a hybrid frequency domain methodology for power system stability analysis, assessing its suitability for networks with high penetrations of inverter-based resources. The work involves reviewing existing impedance scanning practices, applying device level impedance scans and grid frequency sweeps using a hybrid approach, comparing results against established EMT (Electromagnetic Transient) based methods, and validating frequency domain findings through time domain simulations. The project will be delivered over a 12-month period, progressing from initial scoping and review through application, comparison, verification, and final reporting. Expected outcomes include a validated hybrid stability assessment method, comparative evidence of accuracy and efficiency, and documented results to support future stability studies. 

Benefits

This project is expected to enable a more efficient and scalable approach to power system stability assessment by establishing confidence in a hybrid frequency domain methodology. By reducing reliance on computationally intensive EMT time domain simulations, the project could deliver benefits such as faster study turnaround, improved comparability of results, and enhanced consistency across stability assessments. The hybrid approach has the potential to support earlier identification of stability risks and strengthen decision making for networks with high penetrations of inverter-based resources, thereby contributing to the secure, economic, and timely delivery of future network developments. 

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