Journal

This paper proposes a SoC-based distributed droop control method designed to enhance renewable energy penetration and stabilize DC bus voltages in local grids. By incorporating line impedance and ramp rate control, the strategy achieves precise SoC equalization among energy storage systems (ESS) and minimizes voltage fluctuations to within 1%. Simulation results verify that the method improves renewable energy penetration by 56.56% while ensuring efficient power sharing between the AC grid and ESS.

https://ieeexplore.ieee.org/document/11015811 

This paper proposes a dual-input converter system utilizing phase control and a DC boost converter to ensure stable motor operation for portable electronics using both AC and DC sources. By implementing a 1-shunt sensorless method for ultra-high-speed motor control, the system achieves significant miniaturization and cost reduction while maintaining seamless performance during power source transitions. Furthermore, the design focuses on maintaining a constant DC-link voltage to support high-speed rotation, effectively reducing the overall weight and material costs of the drive system. Experimental results verify that the system remains highly reliable and stable even during sudden AC power interruptions by transitioning smoothly to battery power. 

https://www.mdpi.com/2079-9292/11/7/1024

This paper proposes a hybrid active power filter (HAPF) for 3-phase cap-less inverters to address the high harmonics and low power factor typically caused by small-capacity film capacitors. By integrating an L-filter on the DC side and injecting inverted phase-compensation currents, the system effectively reduces high-order harmonics and satisfies IEC 61000-3-2 Class A standards. This approach not only improves material cost competitiveness through miniaturization but also expands the product's operating range by minimizing reactive power. Experimental verification confirms that the proposed method ensures stable motor drive performance while preventing interference with sensitive communication facilities.

https://link.springer.com/article/10.1007/s42835-022-01228-7

This paper proposes a DC plug and outlet system using power semiconductor devices to address safety issues like sparks, surges, and rapid fault currents in residential DC networks. Since DC lacks a zero-crossing point, it requires faster interruption and arc prevention than AC. The proposed system integrates real-time monitoring via magnetic and current sensors, enabling a semiconductor-based breaker to perform high-speed ON/OFF operations. This approach effectively prevents electrical hazards and enhances fault detection. The system's validity was confirmed through experimental verification and algorithmic testing. 

https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE12506561

This paper proposes a power loss analysis method for a full-bridge LLC resonant converter using an enhanced Time-Domain Analysis (TDA) technique. The study demonstrates that power loss can be expressed through a complete equation, with initial values showing less than 5% deviation from simulations. Based on an 8.4kW prototype, the proposed method was compared with experimental data, revealing a maximum efficiency error of only 1.7% under light loads and high accuracy across other regions.

https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE12277521

This paper proposes a design method for Active Clamp Forward (ACF) converters to reduce design errors by accounting for parasitic characteristics and transformer leakage inductance. Unlike traditional methods that overlook these factors, the proposed approach incorporates component impedance to analyze switching element stress and operational ranges accurately. This precise design method significantly enhances the reliability and precision of ACF converters by minimizing the gap between theoretical design and actual performance. 

https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE12051895

To enhance the efficiency and output power quality of large-capacity motor drive systems, this paper proposes the design and implementation of a 3-Level inverter. Unlike conventional systems, the 3-Level topology is focused on reducing power loss and improving the motor's overall performance. The proposed system was validated through experiments comparing it with a traditional 2-Level inverter across various load capacities. The results demonstrate that the 3-Level design effectively improves system efficiency and current power quality, proving its suitability for large-scale industrial applications. 

https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE11953113

To minimize the size and cost of motor drive systems, this paper focuses on ultra-high-speed motors utilizing sensorless control with a DC-link current sensor. However, this configuration suffers from current sampling delays caused by dead zones and stabilization time, which significantly degrade performance in high-speed operations. To address this, an optimal compensation control method is proposed to mitigate these delays. The effectiveness of the proposed control strategy was verified through experiments, ensuring stable and efficient operation for ultra-high-speed motor drives. 

https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE11505449

To enhance the portability of devices like vacuum cleaners and hair dryers, this paper proposes a design for high-speed motors and controllers that reduce overall size and weight. By optimizing the motor for high-speed operation and utilizing 18650 lithium-ion batteries, the system achieves a compact form factor. Furthermore, the integration of an efficient converter and sensorless inverter technology significantly reduces material costs and improves the power-to-weight ratio. These advancements secure product competitiveness by balancing high performance with reduced weight and size in battery-powered applications. 

https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE11065401

This paper proposes a new DFIG system utilizing a matrix converter for effective grid interconnection in wind power applications. The system's performance was verified via PSCAD/EMTDC simulations and further validated through a laboratory-scaled hardware model. This experimental setup featured a motor-generator set with a vector drive and a DSP-based matrix converter, utilizing real wind data to simulate variable-speed turbine conditions accurately. Both simulation and experimental results confirm the feasibility of applying matrix converters to enhance the operation of DFIG-based wind power systems. 

https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE01282647

This paper describes a high-performance single-phase line-interactive DVR composed of an H-bridge inverter and super-capacitors. The system was verified through PSCAD/EMTDC simulations and a 3kVA prototype experiment. The developed DVR compensates for voltage sags and interruptions within 2ms, supporting a maximum interruption duration of 1.5 seconds. It is designed for sensitive loads such as medical and communication equipment, offering a simple structure for easy implementation and high operational reliability using commercial components. 

https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE01278147