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재생에너지원 발전 비중 증가로 인한 국내 전력계통 전압불안정 양상 분석
정인주(Injoo Jeong),오승찬(Seungchan Oh),구현근(Hyunkeun Ku),정솔영(Solyoung Jung),이윤선(Yoonseon Lee),이재형(Jaehyeong Lee),이재걸(Jaegul Lee) 대한전기학회 2024 전기학회논문지 Vol.73 No.9
High penetration of renewable energy resources affects several stability problems. There are lots of stability concepts, one of them which is strongly related to renewable energy resources is called the voltage stability. As shown in this paper, voltage instability in transient can be occurred by renewable energy generation increasing. It is necessary to analyze this phenomenon and how to solve the problems effectively. This paper shows how this phenomenon can be interpreted and analyzed according to load model such as constant power model and ZIP model, which is using a specific methodology called YV analysis. Also, by evaluating power flow in the power system, it shows the specific cause of the voltage instability in a specific location. Using the above results, it is suggested how voltage instability can be effectively improved and solved through simulation.
동기발전기 위상각 안정도 향상을 위한 에너지저장장치(GS-ESS) 적용에 관한 연구
이재걸(Jaegul Lee),정솔영(Solyoung Jung),오승찬(Seungchan Oh),송지영(Jiyoung Song),구현근(Hyunkeun-Ku),신정훈(Jeonghoon Shin) 대한전기학회 2020 전기학회논문지 Vol.69 No.6
For various reasons, the power system stability margin is continuously decreasing. However, in case of Korea, the expansion of the transmission system is facing difficulties due to worsening social acceptability. As an alternative, a technology to increase the power system stability margin using some converter-based facilities is being proposed. In this paper, GS-ESS(Generator Stabilization Energy Storage System) was proposed as a measure to improve the angular stability of synchronous generator. To overcome the limitations of typical ESS frequency measurement methods(using PLLs), GS-ESS directly measures the rotational speed of the generator mechanically and converts it into an electrical signal. In this case study, PSS/E simulation has been performed to analyze the effect of GS-ESS application. For this simulation, we used the 21 buses test system and GS-ESS was installed in the plant bus. And then we analyzed the effects of improving stability according to capacity and response speed in case of fault on the interconnection line between generator and power system. As a result, this case study showed that GS-ESS can be contributed to improving the angular stability of the synchronous generator.