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G. W. Jeon, S .J. Cho, J. Y. Park, and D. G. Lee, "Development of a Transmission Line Simulator for Multi-Terminal HVDC HILS System based on the pi3 Model," International Conference on Advanced Power system Automation and Protection(APAP), 2025.
G. W. Jeon, S .J. Cho, J. Y. Park, and D. G. Lee, "Development of a Transmission Line Simulator for Multi-Terminal HVDC HILS System based on the pi3 Model," International Conference on Advanced Power system Automation and Protection(APAP), 2025.
S. J. Cho, G. W. Jeon, J. Y. Park, D. J. Yun, and D. G. Lee, "Strategy to Minimize Transients in Seamless Mode for Hybrid AC/DC microgird," International Conference on Advanced Power system Automation and Protection(APAP), 2025.
S. J. Cho, G. W. Jeon, J. Y. Park, D. J. Yun, and D. G. Lee, "Strategy to Minimize Transients in Seamless Mode for Hybrid AC/DC microgird," International Conference on Advanced Power system Automation and Protection(APAP), 2025.
G. W. Jeon, J. Y. Park, and D. G. Lee, "Design and Validation of a Simulation Model for VSC-HVDC Based Multi-Terminal Systems," The Korean Institute of Electrical Engineers, 2025.
G. W. Jeon, J. Y. Park, and D. G. Lee, "Design and Validation of a Simulation Model for VSC-HVDC Based Multi-Terminal Systems," The Korean Institute of Electrical Engineers, 2025.
This paper develops an analytical model for VSC-based MTDC systems designed for renewable energy grid integration. The proposed model is structured to incorporate various control strategies and operational scenarios, facilitating simulation-based verification. Furthermore, real-time simulator-based performance validation was conducted to ensure feasibility for actual grid connection.
https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE12351040
J. Y. Park, K. W. Ahn, O. S. Cho, and D. G. Lee, "A Study on a Hybrid DC Circuit Breaker Based on Si IGBT and SiC MOSFET," The Korean Institute of Electrical Engineers, 2025.
J. Y. Park, K. W. Ahn, O. S. Cho, and D. G. Lee, "A Study on a Hybrid DC Circuit Breaker Based on Si IGBT and SiC MOSFET," The Korean Institute of Electrical Engineers, 2025.
As the expansion of renewable energy and DC loads increases worldwide, DC distribution networks are gaining attention for their high energy efficiency and low power loss. For the stable operation of these networks, highly reliable DC interruption technology is essential. This paper proposes a hybrid DC solid-state circuit breaker (SSCB) that connects Si IGBT and SiC MOSFET in parallel. The performance of the proposed system was validated through PSIM simulations.
https://www.dbpia.co.kr/Journal/articleDetail?nodeId=NODE12350819
S. J. Cho, G. W. Jeon, J. Y. Park, D. J. Yun, and D. G. Lee, "A Study on Grid Support Functions of AC/DC Hybrid Distribution Networks Using PSCAD/EMTDC," The Korean Institute of Electrical Engineers, 2025.
S. J. Cho, G. W. Jeon, J. Y. Park, D. J. Yun, and D. G. Lee, "A Study on Grid Support Functions of AC/DC Hybrid Distribution Networks Using PSCAD/EMTDC," The Korean Institute of Electrical Engineers, 2025.
This paper examines the grid support functions of AC DC hybrid distribution networks by applying renewable energy grid connection standards to DC distribution networks. A 3 Terminal MVDC distribution network consisting of PV ESS and DC loads was modeled using 2 Level converters at each terminal. The feasibility of the grid support functions was verified through the PSCAD/EMTDC simulation environment.
https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE12351006
S. J. Cho, S. S. Kim, S. L. Kang, D. J. Yoon, and D. G. Lee, "A Study on Impact Assessment for Optimal Integration of Renewable Energy within a Community Energy System Area " The Korean Institute of Lighting and Electrical Installation Engineers, 2025.
S. J. Cho, S. S. Kim, S. L. Kang, D. J. Yoon, and D. G. Lee, "A Study on Impact Assessment for Optimal Integration of Renewable Energy within a Community Energy System Area " The Korean Institute of Lighting and Electrical Installation Engineers, 2025.
This study assessed PV ESS integration into CHP based Community Energy Systems CES under regulatory conditions using HOMER and PVsyst simulations. The hybrid scenario improved self sufficiency and lowered CO2 emissions compared to the baseline CHP though it raised the LCOE without REC revenue. Results indicate a potential PV profitability IRR 9 point 65 percent if energy sales are permitted highlighting existing regulatory barriers. Regulatory reforms such as REC inclusion and energy trading are crucial for the economic viability of CES.
https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE12244929
G. W. Jeon and D. G. Lee, "3-phase bidirectional power conversion system using various input voltage," The Korean Institute of Illuminating and Electrical Installation Engineers, 2024.
G. W. Jeon and D. G. Lee, "3-phase bidirectional power conversion system using various input voltage," The Korean Institute of Illuminating and Electrical Installation Engineers, 2024.
This paper describes a system featuring a single power conversion circuit and motor that incorporates high efficiency bidirectional converter technology. The system consists of a 3 interleaved high efficiency bidirectional DC DC converter an AC 3 phase bridge diode and a DC AC inverter. It is designed to operate specifically regardless of the 3 phase input voltage variations across different global regions such as 380 V in Korea and Europe 220 V in North America and 480 V in other regions.
https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE12041685
D. Y. Jeong, J. W. Jung, S. S. Park, D. G. Lee, and R. Y. Kim, "Grid Forming cotrol for seamless mode transfer control of 3-phase AC-DC converter," The Korean Institute of Electrical Engineers, 2024.
D. Y. Jeong, J. W. Jung, S. S. Park, D. G. Lee, and R. Y. Kim, "Grid Forming cotrol for seamless mode transfer control of 3-phase AC-DC converter," The Korean Institute of Electrical Engineers, 2024.
This paper proposes a grid forming control technique that enables a stable and seamless mode transfer between grid connected and autonomous operation modes for systems integrated with distributed energy resources. The proposed method simulates the mode transition by operating a circuit breaker at the Point of Common Coupling PCC in a 3 phase AC DC converter. It maintains stable voltage and frequency within the power grid through grid forming control. The effectiveness of this proposed technique is verified using PSCAD EMTDC simulations.
https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE11964040
D. Y. Jung, T. H. Park, J. W. Jung, R. Y. Kim, J. S. Kwak, S. O. Kim, and D. G. Lee, "Development of a Line Simulator Analysis Model for MTDC N-HILS System With the Frequency pi3 Model Based on Vector Fitting ," The Korean Institute of Electrical Engineers, 2024.
D. Y. Jung, T. H. Park, J. W. Jung, R. Y. Kim, J. S. Kwak, S. O. Kim, and D. G. Lee, "Development of a Line Simulator Analysis Model for MTDC N-HILS System With the Frequency pi3 Model Based on Vector Fitting ," The Korean Institute of Electrical Engineers, 2024.
This paper defines N HILS for the control and operation verification of MTDC network systems and proposes the development of a PSCAD EMTDC analysis model for a Line Simulator designed to reflect dynamic characteristics similar to actual HVDC power systems. The Line Simulator was manufactured by converting passive elements to Lab Scale based on Vector Fitting. The reliability of the proposed PSCAD EMTDC analysis model is verified by comparing the step response waveforms of the PSCAD simulation with the actual manufactured Line Simulator.
https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE11916590
D. C. Kim, S. S. Park, R. Y. Kim, S. H. Kim, S. J. Park, and D. G. Lee, "Development and application of a virtual inertia-based ES-STATCOM analysis model for enhancing grid stability in offshore wind power integrated systems," The Korean Institute of Electrical Engineers, 2024.
D. C. Kim, S. S. Park, R. Y. Kim, S. H. Kim, S. J. Park, and D. G. Lee, "Development and application of a virtual inertia-based ES-STATCOM analysis model for enhancing grid stability in offshore wind power integrated systems," The Korean Institute of Electrical Engineers, 2024.
This paper analyzed the impact of a virtual inertia based ES STATCOM model on the grid system when connected to a 10 point 6 GW large scale offshore wind farm in the southwest sea region. An ES STATCOM was developed to provide not only basic STATCOM operation modes but also GFL and GFM modes and performance verification was conducted according to power generation fluctuations and load sizes. The results confirmed that the application of ES STATCOM reduced the frequency fluctuation range thereby achieving improved grid stability.
https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE11916592
J. W. Jung, R. Y. Kim, and D. G. Lee, "A Research of Bidirectional Grid-Forming Converter Control Technology for DC Local Grid's Stable Grid-Connection," The Korean Institute of Electrical Engineers, 2024.
J. W. Jung, R. Y. Kim, and D. G. Lee, "A Research of Bidirectional Grid-Forming Converter Control Technology for DC Local Grid's Stable Grid-Connection," The Korean Institute of Electrical Engineers, 2024.
This paper proposes a bidirectional grid forming control technique for stable grid connection of a DC Local Grid to a weak grid to improve renewable energy acceptance. The proposed method utilizes DC Voltage Synchronization based Grid Forming to control the DC voltage of the DC Local Grid and improves control stability during grid connection. Additionally it stabilizes the DC Local Grid containing Constant Power Loads through q axis voltage feedforward. This technique allows for parallel operation with other converters by applying existing distributed control methods and its effectiveness was verified through PSCAD EMTDC simulations.
https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE11916579
T. H. Park, S. S. Park, R. Y. Kim, and D. G. Lee, "Development and Control of a VSC-HVDC Analysis Model for the West Coast and Fault Characteristics Analysis," The Korean Institute of Electrical Engineers, 2024.
T. H. Park, S. S. Park, R. Y. Kim, and D. G. Lee, "Development and Control of a VSC-HVDC Analysis Model for the West Coast and Fault Characteristics Analysis," The Korean Institute of Electrical Engineers, 2024.
This paper developed an EMT model for an MTDC system which is one of the topologies for the West Coast VSC HVDC backbone grid scheduled for completion in 2036. Through this model the commonly used Master Slave and Droop control techniques in MTDC were implemented. The study analyzes the fault characteristics of MTDC operation based on both Master Slave and Droop methods according to various fault scenarios and performs a comparative analysis of the advantages and disadvantages of each technique.
https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE11916587
J. Y. Park, C. Y. Lee, Y. J. Lee, and D. G. Lee, "Control of DC Link Capacitor Capacity Reduction in Active Converter Structure," The Korean Institute of Electrical Engineers, 2024.
J. Y. Park, C. Y. Lee, Y. J. Lee, and D. G. Lee, "Control of DC Link Capacitor Capacity Reduction in Active Converter Structure," The Korean Institute of Electrical Engineers, 2024.
This paper introduces an Angle Shift Algorithm designed to reduce the DC link capacitor capacity by decreasing the current flowing into the capacitor within an active converter structure. The algorithm is implemented by analyzing the relationship between the converter output current and the inverter input current. By shifting the phase of the converter current to minimize the difference between these two currents the required capacitance can be effectively reduced.
https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE11916464
D. G. Lee, "Development of 3-level inverter for driving large capacity motors," The Korean Institute of Illuminating and Electrical Installation Engineers, 2024.
D. G. Lee, "Development of 3-level inverter for driving large capacity motors," The Korean Institute of Illuminating and Electrical Installation Engineers, 2024.
In this paper experiments and verification were conducted by manufacturing a 3 level inverter with a capacity of 17 kW for motor driving. A control algorithm was proposed to solve the DC Link voltage imbalance problem which is a major challenge in 3 level inverters and an additional algorithm was applied to address issues occurring at high capacity. These methods enable the stable implementation of a 3 level inverter for driving high efficiency large capacity motors.
https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE11797507
D. G. Lee, "DC Link Capacitor Reduction for 3-Phase Motor Driving Inverter" The Korean Institute of Illuminating and Electrical Installation Engineers, 2023.
D. G. Lee, "DC Link Capacitor Reduction for 3-Phase Motor Driving Inverter" The Korean Institute of Illuminating and Electrical Installation Engineers, 2023.
In the case of inverters for driving large capacity motors, the DC link capacitor occupies approximately 30 to 40 percent of the hardware PCB area and is one of the main components prone to failure. To address these issues, cap less inverters have been introduced by replacing traditional capacitors with small capacity film capacitors. However, since the DC link voltage ripple increases significantly when applying a cap less inverter to a 3 phase input system, a stable motor control method is required to ensure reliable operation.
https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE11633286
D. G. Lee, "Improving the input power quality of large capacity cap-less inverter," The Korean Institute of Illuminating and Electrical Installation Engineers, 2023.
D. G. Lee, "Improving the input power quality of large capacity cap-less inverter," The Korean Institute of Illuminating and Electrical Installation Engineers, 2023.
To improve the input power quality reduction caused by the use of large capacity cap less inverters this paper proposes a dc dc converter utilizing module type harmonic reduction technology for the dc link. The cap less inverter is implemented by replacing the large capacity electrolytic capacitor that stabilizes the existing dc link voltage with a small capacity film capacitor. This approach offers significant advantages including improving reliability and reducing PCB size and material costs by removing additional circuits such as inrush current prevention circuits.
https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE11650129
D. G. Lee, H. M. Oh, and S. J. Kim, "System Design for Real-time Heater Temperature Control," The Korean Institute of Electrical Engineers, 2022.
D. G. Lee, H. M. Oh, and S. J. Kim, "System Design for Real-time Heater Temperature Control," The Korean Institute of Electrical Engineers, 2022.
This paper presents a heater temperature control system that achieves precise control performance by applying a temperature sensor to the heater output section and utilizing real-time feedback control. A standard diode-type sensor was used for temperature measurement, and the microcontroller sampled the sensor data in real time to perform step-by-step temperature control. This real-time heater temperature control system is expected to be applicable to various industrial fields that require precise temperature regulation.
https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE11145677
S. J. Kim and D. G. Lee, "Double insulation power circuit design for using external power terminal," The Korean Institute of Electrical Engineers, 2022.
S. J. Kim and D. G. Lee, "Double insulation power circuit design for using external power terminal," The Korean Institute of Electrical Engineers, 2022.
This paper proposes the design and structure of a double-insulated power circuit for SMPS, which is necessary to protect users from electric shock in systems with exposed power terminals. In internal systems using inverters, a common ground is often configured for cost reduction and circuit simplicity. However, when external power terminals are required, the ground must be separated through double insulation to prevent accidents. To achieve this, a Flyback structure is utilized for the insulation circuit, and the transformer must also be designed to meet double insulation standards. This paper describes the specific structural methods applied in practice.
https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE11145676
D. G. Lee and R. Y. Kim, "Current sampling delay compensation control of sensorless inverter for driving high-speed motors," The Korea Institute of Illumination and Electrical Installation Engineers, 2022.
D. G. Lee and R. Y. Kim, "Current sampling delay compensation control of sensorless inverter for driving high-speed motors," The Korea Institute of Illumination and Electrical Installation Engineers, 2022.
To reduce the size and material cost of the inverter system including the motor drive, it is very efficient to apply a high speed motor that increases the rotation speed of the motor and a 1 shunt sensorless control method with the smallest number of sensors. However, when driving a high speed motor, the 1 shunt method causes a current sampling delay problem. In this paper, the optimal control of high speed motors through current sampling delay compensation control is introduced and verified through experiments.
https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE11069406
D. G. Lee, S. S. Chae, Y. H. Lee, J. J. Oh, and D. D. Jung, "Active power filter system for harmonics reduction of large capacity commercial air-conditioner," The Korean Institute of Power Electronics, 2016.
D. G. Lee, S. S. Chae, Y. H. Lee, J. J. Oh, and D. D. Jung, "Active power filter system for harmonics reduction of large capacity commercial air-conditioner," The Korean Institute of Power Electronics, 2016.
Recently, in the field of commercial air conditioners, large-capacity high-efficiency inverters are being used to increase product efficiency and expand the operating range. This has led to an increase in harmonic components in the grid input current, causing power factor degradation, heat generation, and various grid accidents. This paper proposes a 3-phase Active Power Filter system technology to reduce the input current harmonic components of large-capacity commercial air conditioners using inverters. Furthermore, by applying the proposed system to actual products, the harmonic reduction performance of the grid input current was verified.
https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE06716817
B. B. Bae, D. G. Lee, D. J. Yoon, and B. M. Han, "Development of 3 kA line-interactive DVR (Dynamic Voltage Restorer)," The Korean Institute of Electrical Engineers, 2007.
B. B. Bae, D. G. Lee, D. J. Yoon, and B. M. Han, "Development of 3 kA line-interactive DVR (Dynamic Voltage Restorer)," The Korean Institute of Electrical Engineers, 2007.
This paper describes the development of a high performance single-phase line-interactive Dynamic Voltage Restorer DVR. The system is composed of an H-bridge inverter and super-capacitors. Its operational feasibility was verified through PSCAD/EMTDC simulations and experimental work with a 3kVA prototype. The developed system can compensate for input voltage sag and interruption within 2ms, with a maximum allowable interruption duration of 1.5 seconds. The system features a simple structure for easy implementation with commercial components and ensures high reliability in operation.
https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE01332962
D. G. Lee, D. Y. Lee, B. M. Han, J. S. Ko, and N. S. Choi, "Simulator development and performance analysis of wind power system interconnected with induction generator," The Korean Institute of Electrical Engineers, 2007.
D. G. Lee, D. Y. Lee, B. M. Han, J. S. Ko, and N. S. Choi, "Simulator development and performance analysis of wind power system interconnected with induction generator," The Korean Institute of Electrical Engineers, 2007.
This paper presents the design and implementation of a wind turbine simulator to model wind power systems under variable wind speeds. By processing blade efficiency as a function of the tip-speed ratio with real-time speed data, the system models torque input without complex operations. To compensate for reactive power in squirrel-cage induction generator systems, a real-time STATCOM using a 36-pulse voltage-source converter with a pulse-multiplexed auxiliary bridge circuit was applied. The system's performance was verified through EMTDC/PSCAD simulations and reduced-model hardware experiments.
https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE01331417
B. B. Bae, D. G. Lee, D. Y. Lee, and B. M. Han, "Experimental analysis of UPQC with cascaded H-bridge modules," The Korean Institute of Electrical Engineers, 2007.
B. B. Bae, D. G. Lee, D. Y. Lee, and B. M. Han, "Experimental analysis of UPQC with cascaded H-bridge modules," The Korean Institute of Electrical Engineers, 2007.
This paper proposes a Unified Power Quality Conditioner (UPQC) that directly connects to 22.9kV distribution systems using multi-level H-bridges and multi-winding transformers. The proposed UPQC is designed to operate at high voltages by series-connecting inverter modules instead of direct semiconductor switching, enhancing design flexibility. The technical feasibility was demonstrated through EMTDC simulations and reduced-model hardware experiments, indicating its potential for full-scale grid application. By eliminating the need for a series injection transformer, this system overcomes the vulnerabilities associated with conventional UPQC designs.
https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE01331429
Y. H. Park, Y. H. Cho, D. U. Lee, D. G. Lee, and B. M. Han, "Experimental analysis of back-to-back HVDC system composed of 36-pulse voltage source converter," The Korean Institute of Electrical Engineers, 2006.
Y. H. Park, Y. H. Cho, D. U. Lee, D. G. Lee, and B. M. Han, "Experimental analysis of back-to-back HVDC system composed of 36-pulse voltage source converter," The Korean Institute of Electrical Engineers, 2006.
This paper proposes a 36-pulse back-to-back voltage-sourced converter using four 12-pulse bridges with a pulse-insertion auxiliary circuit. The proposed converter enables the independent control of active and reactive power at the AC connection point. The principle of increasing the pulse number was analyzed through a theoretical approach, and the operational validity was verified using PSCAD/EMTDC software simulations. Furthermore, a reduced-model hardware implementation was tested to confirm its feasibility, suggesting that the proposed converter can be widely utilized for HVDC and FACTS devices.
https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE01344594
J. Y. Choi, D. G. Lee, D. Y. Lee, B. B. Bae, and B. M. Han, "Interconnection analysis of active power filter with electronic load simulator with power-recovery capability," The Korean Institute of Electrical Engineers, 2006.
J. Y. Choi, D. G. Lee, D. Y. Lee, B. B. Bae, and B. M. Han, "Interconnection analysis of active power filter with electronic load simulator with power-recovery capability," The Korean Institute of Electrical Engineers, 2006.
This paper proposes a new load simulator designed to effectively analyze the performance of power quality conditioners in a laboratory setting. The simulator features two PWM inverters sharing a DC link, allowing for the testing of both linear and nonlinear loads within a single device. Combined testing with an active power filter was conducted, and the system characteristics were analyzed using PSCAD/EMTDC simulations. To verify practical feasibility, a 20kVA load simulator and a 10kVA active power filter were implemented and tested. The results confirm that the proposed load simulator is highly effective for verifying the various compensation capabilities of active power filters.
https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE01330282
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