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Volt-Var 특성 곡선의 기울기가 전압 Oscillation에 미치는 영향
맹창엽(Chang-Yeop Maeng),조종민(Jong-Min Jo),명노길(No-Gil Myoung),김현진(Hyeon-Jin Kim),조성수(Seong-Soo Cho) 대한전기학회 2022 전기학회논문지 Vol.71 No.1
The penetration of Renewable Energy Source (RES) has been increasing because RES is drawing attention by the environmental problem in the worldwide. The power flow can be changed from unidirectional to bidirectional because of increasing the penetration of RES. In bidirectional system, the efficient operation of conventional Voltage Regulators (VRs) is difficult. As one of the various methods to reinforce the conventional VR, the Volt-Var control of the Smart Inverter (SI) is used for supporting the voltage by using the reactive power of RES. This paper verifies the operating principle of the Volt-Var control function of the inverter and the oscillation phenomenon according to the slope of the Volt-Var curve was confirmed through theory, simulation, and demonstration site.
과도안정도와 미소신호안정도 관점에서 국내 전력계통의 임계관성계수 평가
백종오(Jong-Oh Baek),정인주(In-Joo Jeong),하정민(Jung-Min Ha),맹창엽(Chang-Yeop Maeng),권오근(Oh-Geun Kwon),이배근(Bae-Geun Lee),김수배(Soobae Kim) 대한전기학회 2019 전기학회논문지 Vol.68 No.9
The increase of inverter-based renewable energy sources reduces inertia constant of power systems and the loss of the system inertia may cause power system stability problems. To ensure a secure energy delivery system, these problems should be analyzed thoroughly from various perspectives about power system stability. This paper presents the estimation of the critical inertia of Korean power systems, which is the minimum amount of inertia required to maintain power system dynamic securities. The estimation has been made by gradually reducing the system inertia of Korean power systems and then by analyzing the change of dynamic securities in terms of transient and small signal stabilities. In the transient stability aspect, the decrease of critical clearing time(CCT) has been analyzed with four different reduced inertial models of Korean power systems. With the small signal stability perspective, the change of the system damping ratio has been studied. Based on the results from the stability studies, the critical inertia has been determined and it can be considered as the indirect limit of renewable energy shares in Korean power systems.