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A grid-feeding converter system is added to a novel power system transientsimulation scheme based on frequency response optimized integrators consideringsecond order derivative. The converter system and its implementation in thesimulation scheme are detailed. Case studies verify the accuracy and efficiencyof the simulation scheme. Furthermore, this paper proposes and justifiesextending the simulation scheme by integrating commonly used numericalintegrators considering first order derivative for part of the studied system.The proposed extension has an insignificant impact on the accuracy of thesimulation scheme while significantly enhancing its efficiency. It also reducesthe development burden in adding new devices.

Transient Simulation of Grid-Feeding Converter System for Stability Studies Using Frequency Response Optimized Integrators