*Article* **Dynamic-Model-Based AGC Frequency Control Simulation Method for Korean Power System**

#### **Han Na Gwon and Kyung Soo Kook \***

Department of Electrical Engineering, Jeonbuk National University, Deokjin-gu, Jeonju 54896, Korea; canna08@jbnu.ac.kr

**\*** Correspondence: kskook@jbnu.ac.kr; Tel.: +82-63-270-2368

Received: 19 August 2020; Accepted: 22 September 2020; Published: 25 September 2020

**Abstract:** To fulfill the need of operating power systems more effectively through diverse resources, frequency control conditions for maintaining a balance between generators and loads need to be provided accurately. As frequency control is generally achieved via the governor responses from local generators and the automatic generation control (AGC) frequency control of the central energy managemen<sup>t</sup> system, it is important to coordinate these two mechanisms of frequency control efficiently. This paper proposes a dynamic-model-based AGC frequency control simulation method that can be designed and analyzed using the governor responses of generators, which are represented through dynamic models in the planning stage. In the proposed simulation model, the mechanism of the AGC frequency control is implemented based on the dynamic models of the power system, including governors and generators; hence, frequency responses from the governors and AGC can be sequentially simulated to coordinate and operate these two mechanisms efficiently. The effectiveness of the proposed model is verified by simulating the AGC frequency control of the Korean power system and analyzing the coordination effect of the frequency responses from the governors and AGC.

**Keywords:** automatic generation control (AGC); frequency control; dynamic deadband; energy managemen<sup>t</sup> system (EMS); governor response
