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Jaehyeong Lee
School of Electrical Engineering, Korea University, Seoul 02841, Korea

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Journal article
Published: 25 April 2021 in Applied Sciences
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An increase in inverter-based resources (IBRs) can lower the inertia of a power system, which may adversely affect the power system by causing changes such as a frequency nadir reduction or an increased initial rate of change of frequency (RoCoF). To prevent this, an ancillary service called fast frequency response (FFR) helps the inertia response by using IBRs. The main resources used in FFR are variable-speed wind turbine generators (VSWTGs) or energy storage systems (ESSs), which can respond quickly through converter control. The control is applied to the frequency regulation service faster than the primary frequency response, so the second frequency nadir may fall below the first frequency nadir. This study proposed a novel coordinated control strategy to efficiently utilize energy to improve the frequency nadir through coordinated control of wind turbines based on permanent magnetic synchronous generators (PMSGs) and battery energy storage systems (BESSs). The simulation results confirmed that the two-bus test system was composed of PSCAD/EMTDC, and the frequency nadir increased by utilizing the same amount of energy as in traditional control systems.

ACS Style

HyunWook Kim; Junghun Lee; Jaehyeong Lee; Gilsoo Jang. Novel Coordinated Control Strategy of BESS and PMSG-WTG for Fast Frequency Response. Applied Sciences 2021, 11, 3874 .

AMA Style

HyunWook Kim, Junghun Lee, Jaehyeong Lee, Gilsoo Jang. Novel Coordinated Control Strategy of BESS and PMSG-WTG for Fast Frequency Response. Applied Sciences. 2021; 11 (9):3874.

Chicago/Turabian Style

HyunWook Kim; Junghun Lee; Jaehyeong Lee; Gilsoo Jang. 2021. "Novel Coordinated Control Strategy of BESS and PMSG-WTG for Fast Frequency Response." Applied Sciences 11, no. 9: 3874.

Journal article
Published: 18 April 2021 in Energies
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In this study, we mitigated the harmonic voltage in a power system that contained the roughing mill (RM) and finishing mill (FM) motor drives. AC/DC converter type RM drive is a non-linear, large-capacity varying load that adversely affects power quality, e.g., a flicker, voltage distortion, etc. The voltage drop can be compensated within a certain limit by using the proper capacity of a power capacitor bank. In addition, the voltage distortion can be controlled as per the guidelines of IEEE Std. 519 using the passive harmonic filter corresponding to the characteristic harmonics of the motor drive load. The passive harmonic filter can provide an economical solution by mitigating the harmonic distortion with a proper reactive power supply. However, at the planning level, attention should be paid to avoid system overvoltage that is caused by the leading power under light load conditions and also the problem of parallel resonance between the harmonic filter and the step-down transformer. In addition, when designing the filter reactor, the K-factor and peak voltage must be considered; the filter capacitor also requires a dielectric material that considers the harmonic peak voltage. The purpose of this study was to acquire a better understanding of the filter applications as well as verify the field measurement, analysis, and design of harmonic filters together with its performance.

ACS Style

Byungju Park; Jaehyeong Lee; Hangkyu Yoo; Gilsoo Jang. Harmonic Mitigation Using Passive Harmonic Filters: Case Study in a Steel Mill Power System. Energies 2021, 14, 2278 .

AMA Style

Byungju Park, Jaehyeong Lee, Hangkyu Yoo, Gilsoo Jang. Harmonic Mitigation Using Passive Harmonic Filters: Case Study in a Steel Mill Power System. Energies. 2021; 14 (8):2278.

Chicago/Turabian Style

Byungju Park; Jaehyeong Lee; Hangkyu Yoo; Gilsoo Jang. 2021. "Harmonic Mitigation Using Passive Harmonic Filters: Case Study in a Steel Mill Power System." Energies 14, no. 8: 2278.

Original research paper
Published: 30 December 2020 in IET Generation, Transmission & Distribution
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With the increasing number of embedded high‐voltage DC (HVDC) projects in AC systems, there is growing research interest in controlling the operating point of the HVDC in real time. This real‐time operation system requires the AC system information to be continuously updated, which involves practical challenges such as the burden of communication. To mitigate this problem, this paper proposes a novel technique to screen the AC system monitoring area for the efficient operation of the embedded HVDC. The screening algorithm determines the monitoring area by HVDC sensitivity analysis using the power transfer distribution factor. Then, a reliable and efficient grid operation is enabled using the limited data obtained from the determined area. The proposed methodology is verified using a Korean power system with multiple HVDCs. The effectiveness and advantages of the proposed technology are verified by comparing the results obtained using the system‐wide data with those obtained from the monitoring area.

ACS Style

Jaehyeong Lee; Woosung Kim; Seungmin Jung; JaeWan Suh; MinHan Yoon; Gilsoo Jang. Monitoring area screening of AC system to improve embedded VSC‐HVDC operation efficiency. IET Generation, Transmission & Distribution 2020, 15, 1031 -1042.

AMA Style

Jaehyeong Lee, Woosung Kim, Seungmin Jung, JaeWan Suh, MinHan Yoon, Gilsoo Jang. Monitoring area screening of AC system to improve embedded VSC‐HVDC operation efficiency. IET Generation, Transmission & Distribution. 2020; 15 (6):1031-1042.

Chicago/Turabian Style

Jaehyeong Lee; Woosung Kim; Seungmin Jung; JaeWan Suh; MinHan Yoon; Gilsoo Jang. 2020. "Monitoring area screening of AC system to improve embedded VSC‐HVDC operation efficiency." IET Generation, Transmission & Distribution 15, no. 6: 1031-1042.

Journal article
Published: 09 November 2020 in Applied Sciences
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Renewable generation in power systems has proved to be challenging for system operators owing to the increasing levels of penetration. The operation of power systems currently requires additional flexibility and reserves due to the intermittency and unpredictability of renewable generators. However, it is difficult to precisely predict and control the stochastic nature of renewable sources; nevertheless, its capacity continues to increase. To monitor and control renewable generators efficiently, the entire system needs to be established in a hierarchical order. This study proposed the concept of a substation that is uniquely designed for renewable interconnection. The purpose of this substation is simple: to make the renewable generators dispatchable to operators such that each group of renewable generators is sufficiently stable to be considered as conventional generators. For this purpose, methods for sizing and controlling energy storage system are proposed based on forecasts and error distributions.

ACS Style

Yeuntae Yoo; Seungmin Jung; Sungwoo Kang; Sungyoon Song; Jaehyeong Lee; Changhee Han; Gilsoo Jang. Dispatchable Substation for Operation and Control of Renewable Energy Resources. Applied Sciences 2020, 10, 7938 .

AMA Style

Yeuntae Yoo, Seungmin Jung, Sungwoo Kang, Sungyoon Song, Jaehyeong Lee, Changhee Han, Gilsoo Jang. Dispatchable Substation for Operation and Control of Renewable Energy Resources. Applied Sciences. 2020; 10 (21):7938.

Chicago/Turabian Style

Yeuntae Yoo; Seungmin Jung; Sungwoo Kang; Sungyoon Song; Jaehyeong Lee; Changhee Han; Gilsoo Jang. 2020. "Dispatchable Substation for Operation and Control of Renewable Energy Resources." Applied Sciences 10, no. 21: 7938.

Journal article
Published: 15 October 2019 in Energies
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As the penetration rate of renewable enery resources (RES) in the power system increases, uncertainty and variability in system operation increase. The application of energy storage systems (ESS) in the power system has been increased to compensate for the characteristics of renewable energy resources. Since ESS is a controllable and highly responsive power resource, primary frequency response and inertia response are possible in case of system contingency, so it can be utilized for frequency regulation (FR) purposes. In frequency regulation, reduction of the Rate of Change of Frequency (RoCoF) and increase the frequency nadir by improving the response characteristics are important factors to secure frequency stability. Therefore, it is important to control ESS with proper parameters according to changing system situation. In this paper, we propose a method to calculate and apply a frequency droop, which is basically required according to the power system condition based on swing equation and effective inertia assessment. In addition, a method to estimate RoCoF droop according to the correlation with frequency by estimating the systematic inertia in the current situation is proposed. The case study for verification of the proposed method was performed through dynamic simulation using actual Korean power system data. The results show that the proposed method is more effective than the governor-free of the conventional thermal generator and conventional droop control-based FR-ESS.

ACS Style

MinHan Yoon; Jaehyeong Lee; Sungyoon Song; Yeontae Yoo; Gilsoo Jang; Seungmin Jung; Sungchul Hwang. Utilization of Energy Storage System for Frequency Regulation in Large-Scale Transmission System. Energies 2019, 12, 3898 .

AMA Style

MinHan Yoon, Jaehyeong Lee, Sungyoon Song, Yeontae Yoo, Gilsoo Jang, Seungmin Jung, Sungchul Hwang. Utilization of Energy Storage System for Frequency Regulation in Large-Scale Transmission System. Energies. 2019; 12 (20):3898.

Chicago/Turabian Style

MinHan Yoon; Jaehyeong Lee; Sungyoon Song; Yeontae Yoo; Gilsoo Jang; Seungmin Jung; Sungchul Hwang. 2019. "Utilization of Energy Storage System for Frequency Regulation in Large-Scale Transmission System." Energies 12, no. 20: 3898.

Journal article
Published: 30 May 2019 in Applied Sciences
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Recently, there have been many cases in which direct current (DC) facilities have been placed in alternating current (AC) systems for various reasons. In particular, in Korea, studies are being conducted to install a back-to-back (BTB) voltage-sourced converter (VSC) high-voltage direct current (HVDC) to solve the fault current problem of the meshed system, and discussions on how to operate it have been made accordingly. It is possible to provide grid services such as minimizing grid loss by changing the HVDC operating point, but it also may violate reliability standards without proper HVDC operation according to the system condition. Especially, unlike the AC system, DC may adversely affect the AC system because the operating point does not change even after a disturbance has occurred, so strategies to change the operating point after the contingency are required. In this paper, a method for finding the operating point of embedded HVDC that minimizes losses within the range of compliance with the reliability criterion is proposed. We use the Power Transfer Distribution Factor (PTDF) to reduce the number of buses to be monitored during HVDC control, reduce unnecessary checks, and determine the setpoints for the active/reactive power of the HVDC through system total loss minimization (STLM) control to search for the minimum loss point using Powell’s direct set. We also propose an algorithm to search for the operating point that minimizes the loss automatically and solves the overload occurring in an emergency through security-constrained loss minimization (SCLM) control. To verify the feasibility of the algorithm, we conducted a case study using an actual Korean power system and verified the effect of systematic loss reduction and overload relief in a contingency. The simulations are conducted by a commercial power system analysis tool, Power System Simulator for Engineering (PSS/E).

ACS Style

Jaehyeong Lee; MinHan Yoon; Sungchul Hwang; Soseul Jeong; Seungmin Jung; Gilsoo Jang. Development of A Loss Minimization Based Operation Strategy for Embedded BTB VSC HVDC. Applied Sciences 2019, 9, 2234 .

AMA Style

Jaehyeong Lee, MinHan Yoon, Sungchul Hwang, Soseul Jeong, Seungmin Jung, Gilsoo Jang. Development of A Loss Minimization Based Operation Strategy for Embedded BTB VSC HVDC. Applied Sciences. 2019; 9 (11):2234.

Chicago/Turabian Style

Jaehyeong Lee; MinHan Yoon; Sungchul Hwang; Soseul Jeong; Seungmin Jung; Gilsoo Jang. 2019. "Development of A Loss Minimization Based Operation Strategy for Embedded BTB VSC HVDC." Applied Sciences 9, no. 11: 2234.

Journal article
Published: 05 January 2018 in Applied Sciences
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Various control methods and applications have been introduced to power systems in order to alleviate the uncertainties of relying on renewable sources. This paper, focusing on a reactive power allocation process, discusses the development of a self-modification algorithm and its introduction to an online reference management system. The algorithm is designed to predict unexpected situations occurring in real-time operations, when, due to technical issues, the control system becomes unavailable. A test system has been formed to check the feasibility of the composed method. As the main purpose of the feasibility study is checking availability with a complex solution, case studies are designed to adapt a reactive power allocation method based on loss minimization. When unexpected systemic errors were induced, the proposed modification plan changed order automatically with maintaining previous objective function. The improved effects, caused by realistic responses, are classified according to EMTDC (Electro-Magnetic Transient Design and Control) analysis.

ACS Style

Seungmin Jung; Yeuntae Yoo; Taehyung Kim; Jae-Hyeong Lee; MinHan Yoon; Gilsoo Jang. A Study of Order Modification for Reactive Power Support by Wind Farm during Communication Failure. Applied Sciences 2018, 8, 68 .

AMA Style

Seungmin Jung, Yeuntae Yoo, Taehyung Kim, Jae-Hyeong Lee, MinHan Yoon, Gilsoo Jang. A Study of Order Modification for Reactive Power Support by Wind Farm during Communication Failure. Applied Sciences. 2018; 8 (1):68.

Chicago/Turabian Style

Seungmin Jung; Yeuntae Yoo; Taehyung Kim; Jae-Hyeong Lee; MinHan Yoon; Gilsoo Jang. 2018. "A Study of Order Modification for Reactive Power Support by Wind Farm during Communication Failure." Applied Sciences 8, no. 1: 68.

Journal article
Published: 04 November 2015 in Energies
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A system that combines a wind turbine and a wave generator can share the off-shore platform and therefore mix the advantages of the transmission system construction and the power conversion system. The current hybrid generation system considers output limitation according to the instructions of the transmission system operator (TSO), and controls the profile using wind turbine pitch control. However, the integrated wave generation system utilizing a DC network does not adapt a power limitation scheme due to its mechanical constraints. In this paper, a control plan focusing on the electrical section of wave generators is formed in order to effectively manage the output profile of the hybrid generation system. The plan pays attention to power reserve flexibility for the utility grid using the analysis of the controllable elements. Comparison with the existing system is performed based on real offshore conditions. With the help of power system computer aided design (PSCAD) simulation, the ability of the novel technique is estimated by proposing the real power control based on the reference signal of TSO and the reactive power capacity it produces.

ACS Style

Seungmin Jung; Yeuntae Yoo; HyunWook Kim; Jae-Hyeong Lee; MinHan Yoon; Gilsoo Jang. Development of an Active Power Reserve Management Method for DC Applied Wave-Wind Combined Generation Systems. Energies 2015, 8, 12488 -12504.

AMA Style

Seungmin Jung, Yeuntae Yoo, HyunWook Kim, Jae-Hyeong Lee, MinHan Yoon, Gilsoo Jang. Development of an Active Power Reserve Management Method for DC Applied Wave-Wind Combined Generation Systems. Energies. 2015; 8 (11):12488-12504.

Chicago/Turabian Style

Seungmin Jung; Yeuntae Yoo; HyunWook Kim; Jae-Hyeong Lee; MinHan Yoon; Gilsoo Jang. 2015. "Development of an Active Power Reserve Management Method for DC Applied Wave-Wind Combined Generation Systems." Energies 8, no. 11: 12488-12504.