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Namki Choi
Department of Electric and Electrical Engineering, Korea University, Seoul 02841, Korea

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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: 14 May 2019 in Energies
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Measurement-based technology has been developed in the area of power transmission systems with phasor measurement units (PMU). Using high-resolution PMU data, the oscillatory behavior of power systems from general electromagnetic oscillations to sub-synchronous resonances can be observed. Studying oscillations in power systems is important to obtain information about the orbital stability of the system. Floquet multipliers calculation is based on a mathematical model to determine the orbital stability of a system with the existence of stable or unstable periodic solutions. In this paper, we have developed a model-free method to estimate Floquet multipliers using time series data. A comparative study between calculated and estimated Floquet multipliers has been performed to validate the proposed method. The results are provided for a sample three-bus power system network and the system integrated with a doubly fed induction generator.

ACS Style

Namki Choi; Hwanhee Cho; Byongjun Lee. Development of Floquet Multiplier Estimator to Determine Nonlinear Oscillatory Behavior in Power System Data Measurement. Energies 2019, 12, 1824 .

AMA Style

Namki Choi, Hwanhee Cho, Byongjun Lee. Development of Floquet Multiplier Estimator to Determine Nonlinear Oscillatory Behavior in Power System Data Measurement. Energies. 2019; 12 (10):1824.

Chicago/Turabian Style

Namki Choi; Hwanhee Cho; Byongjun Lee. 2019. "Development of Floquet Multiplier Estimator to Determine Nonlinear Oscillatory Behavior in Power System Data Measurement." Energies 12, no. 10: 1824.

Journal article
Published: 21 February 2019 in Sustainability
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This study analyzed the impact of varying the momentary cessation (MC) voltage level on the short circuit current of inverter-based resources (IBRs). To analyze the impact of the IBR MC function on the short circuit current, this paper proposes an advanced IBR model for fault current calculation to reflect its fault characteristics and a scheme for analyzing the influence of MC on the short circuit current. Based on the proposed methods, the authors conducted case studies using planning data from the Korea Electric Power Corporation (KEPCO). The influence of MC was investigated on the IBRs located at the southwest side of the KEPCO systems by screening the fault currents while varying the MC voltage. This paper demonstrates that the minimum MC voltage level needed for the fault current not to exceed the circuit breaker (CB) capacity can be proposed through analyzing the impact of MC voltage level on the short circuit current. The test results based on the proposed scheme showed that the short circuit current to power systems could not violate CB capacity if IBRs adjusted the MC voltage level higher than the lowest MC voltage level.

ACS Style

Namki Choi; BoHyun Park; Hwanhee Cho; Byongjun Lee. Impact of Momentary Cessation Voltage Level in Inverter-Based Resources on Increasing the Short Circuit Current. Sustainability 2019, 11, 1153 .

AMA Style

Namki Choi, BoHyun Park, Hwanhee Cho, Byongjun Lee. Impact of Momentary Cessation Voltage Level in Inverter-Based Resources on Increasing the Short Circuit Current. Sustainability. 2019; 11 (4):1153.

Chicago/Turabian Style

Namki Choi; BoHyun Park; Hwanhee Cho; Byongjun Lee. 2019. "Impact of Momentary Cessation Voltage Level in Inverter-Based Resources on Increasing the Short Circuit Current." Sustainability 11, no. 4: 1153.