Validation of Numerical Calculations of Electromechanical Transient Processes When Assessing the Stability of Electric Power Systems Using Renewable Energy Sources

The widespread introduction of renewable energy sources (RES) into modern electric power systems (EPS) significantly changes their dynamic properties. EPS stability issues arise due to the properties of non-synchronous generating units (GU) based on RES with power converters (PC), which are fundamentally different from conventional synchronous generation. Mathematical modeling of EPS stability issues is currently performed by purely numerical calculation of electromechanical transients in which various simplifications and limitations are applied based on the development and modification “generic” mathematical models of EPS-based GUs with PCs. In the present study, stability calculations of EPS with GU based on RES with PC reveal the impact of the applied simplifications and constraints in the purely numerical calculation of electromechanical transients on the quality of the solution of problems of stability evaluation of EPS with RES. Areas of application of the modified GU model based on RES with PC as part of the EPS model of real dimensionality are identified at which the largest and smallest errors occur, along with their causes. Such “all-mode” verification becomes feasible due to the alternative approach proposed in the article, which is based on the use of a model benchmark instead of field data. © 2023, Springer Science+Business Media, LLC, part of Springer Nature.