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Prof. DOHYUK KIM
Yeonsung University

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Research Keywords & Expertise

0 Power Systems
0 power electrical engineering
0 reactive power optimization
0 Renewable Energies Sources
0 system strength

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Journal article
Published: 02 February 2021 in Sustainability
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System strength is an important concept in the integration of renewable energy sources (RESs). However, evaluating system strength is becoming more ambiguous due to the interaction of RESs. This paper proposes a novel scheme to define the actual interaction boundaries of RESs using the power flow tracing strategy. Based on the proposed method, the interaction boundaries of RESs were identified at the southwest side of Korea Electric Power Corporation (KEPCO) systems. The test results show that the proposed approach always provides the identical interaction boundaries of RESs in KEPCO systems, compared to the Electric Reliability Council of Texas (ERCOT) method. The consistent boundaries could be a guideline for power-system planners to assess more accurate system strength, considering the actual interactions of the RESs.

ACS Style

Namki Choi; Byongjun Lee; Dohyuk Kim; Suchul Nam. Interaction Boundary Determination of Renewable Energy Sources to Estimate System Strength Using the Power Flow Tracing Strategy. Sustainability 2021, 13, 1569 .

AMA Style

Namki Choi, Byongjun Lee, Dohyuk Kim, Suchul Nam. Interaction Boundary Determination of Renewable Energy Sources to Estimate System Strength Using the Power Flow Tracing Strategy. Sustainability. 2021; 13 (3):1569.

Chicago/Turabian Style

Namki Choi; Byongjun Lee; Dohyuk Kim; Suchul Nam. 2021. "Interaction Boundary Determination of Renewable Energy Sources to Estimate System Strength Using the Power Flow Tracing Strategy." Sustainability 13, no. 3: 1569.

Journal article
Published: 28 August 2020 in IEEE Transactions on Power Systems
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Reactive power reserves are important for grid stability and have a variety patterns depending on fault location as power systems become larger and complex. This paper presents the clustered effective reactive reserve (CEQR), an indicator that is suitable for identifying the risk of dynamic voltage stabitlity in terms of power system operation. This indicator provides the following features: i) It calculate the realistic reactive reserve to recognize dynamically changing system conditions; ii)it derive clustered areas to identify valid regions for system control. The proposed method uses the sensitivity between dynamic reactive resources or load buses and a particular bus to obtain the correlation. And since this indicator is calculated using only the system topology, current and maximum outputs of the generators, there is less computational burden. This study verified the features of clustered effective reactive reserve(CEQR) by analyzing the practicable dynamic voltage collapse scenarios in the Korean electric power(KEPCO) system. In addition, as a countermeasure against the dynamic voltage collapse, the control performance of blocking tap changer scheme using the proposed indicator is described.

ACS Style

BoHyun Park; Seunghyuk Im; Dohyuk Kim; Byongjun Lee. Clustered Effective Reactive Reserve to Secure Dynamic Voltage Stability in Power System Operation. IEEE Transactions on Power Systems 2020, 36, 1183 -1192.

AMA Style

BoHyun Park, Seunghyuk Im, Dohyuk Kim, Byongjun Lee. Clustered Effective Reactive Reserve to Secure Dynamic Voltage Stability in Power System Operation. IEEE Transactions on Power Systems. 2020; 36 (2):1183-1192.

Chicago/Turabian Style

BoHyun Park; Seunghyuk Im; Dohyuk Kim; Byongjun Lee. 2020. "Clustered Effective Reactive Reserve to Secure Dynamic Voltage Stability in Power System Operation." IEEE Transactions on Power Systems 36, no. 2: 1183-1192.

Journal article
Published: 24 April 2020 in Sustainability
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The penetration of renewable energy sources (RESs) equipped with inverter-based control systems such as wind and solar plants are increasing. Therefore, the speed of the voltage controllers associated with inverter-based resources (IBRs) has a substantial impact on the stability of the interconnected grid. System strength evaluation is one of the important concerns in the integration of IBRs, and this strength is often evaluated in terms of the short circuit ratio (SCR) index. When IBRs are installed in an adjacent location, system strength can be weaker than evaluation by SCR. This study proposes an inverter interaction level short circuit ratio (IILSCR) method by tracing IBRs output flow. The IILSCR can accurately estimate system strength, wherein IBRs are connected in adjacent spots, by reflecting the interaction level between IBRs. The study also demonstrates the efficiency of IILSCR by applying this method to Institute of Electrical and Electronics Engineers (IEEE) 39 bus test system and future Korea power systems.

ACS Style

Dohyuk Kim; Hwanhee Cho; BoHyun Park; Byongjun Lee. Evaluating Influence of Inverter-based Resources on System Strength Considering Inverter Interaction Level. Sustainability 2020, 12, 3469 .

AMA Style

Dohyuk Kim, Hwanhee Cho, BoHyun Park, Byongjun Lee. Evaluating Influence of Inverter-based Resources on System Strength Considering Inverter Interaction Level. Sustainability. 2020; 12 (8):3469.

Chicago/Turabian Style

Dohyuk Kim; Hwanhee Cho; BoHyun Park; Byongjun Lee. 2020. "Evaluating Influence of Inverter-based Resources on System Strength Considering Inverter Interaction Level." Sustainability 12, no. 8: 3469.