**5. Conclusions**

This paper proposed a dynamic-model-based AGC frequency control simulation method employing the Korean power system that can be designed and analyzed coordinately with the governor responses of the generators. The existing dynamic-model-based simulation frameworks typically used for power system analysis were adapted to include the AGC frequency control to implement the simulation model for both the AGC frequency control and governor responses. As the database of the Korean power system has been implemented in the framework of PSS/E, Python was used as the API for implementing the AGC frequency control and interfacing its responses to the dynamic-model-based simulation model through additional PLC functions of the governor models using PSS/E. Accordingly, the proposed simulation model could flexibly implement the AGC frequency control and effectively use the existing models of power systems.

The effectiveness and applicability of the proposed simulation model for AGC frequency control were verified using various case studies. These case studies examined each function of the AGC frequency control and analyzed the effects of variation of the control parameters related to the deadband filter of the AGC frequency control.

Owing to the need to operate the power system more competitively with more variable resources, the proposed simulation model can be used to tune the control parameters of the AGC frequency control to achieve a highly efficient coordination of operations with the governor responses from local generators.

**Author Contributions:** Conceptualization, H.N.G. and K.S.K.; methodology, H.N.G. and K.S.K.; software, H.N.G.; validation, H.N.G., and K.S.K.; writing-original draft preparation, H.N.G. and K.S.K.; writing-review and editing, K.S.K.; supervision, K.S.K. All authors have read and agreed to the published version of the manuscript.

**Acknowledgments:** This research was partially supported by the Korea Electric Power Corporation (grant number: R18XA04).

**Conflicts of Interest:** The authors declare no conflict of interest.
