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A New High Efficient Bi-directional DC/DC Converter in the Dual Voltage System
Su-Won Lee,Seong-Ryong Lee,Chil-Hwan Jeon 대한전기학회 2006 Journal of Electrical Engineering & Technology Vol.1 No.3
This paper introduces a new high efficient bi-directional, non-isolated DC/DC converter. Through variations of the topology of the conventional Cuk converter, an optimum bi-directional DC/DC converter is proposed. Voltage and current in the proposed DC/DC converter are continuous. Furthermore, the efficiency in both step-up and step-down mode is improved over that of the conventional bi-directional converter. To prove the validation for the proposed converter, simulations and experiments are executed with a 300W bi-directional converter.
A New High Efficient Bi-directional DC/DC Converter in the Dual Voltage System
Lee Su-Won,Lee Seong-Ryong,Jeon Chil-Hwan The Korean Institute of Electrical Engineers 2006 Journal of Electrical Engineering & Technology Vol.1 No.3
This paper introduces a new high efficient bi-directional, non-isolated DC/DC converter. Through variations of the topology of the conventional Cuk converter, an optimum bi-directional DC/DC converter is proposed. Voltage and current in the proposed DC/DC converter are continuous. Furthermore, the efficiency in both step-up and step-down mode is improved over that of the conventional bi-directional converter. To prove the validation for the proposed converter, simulations and experiments are executed with a 300W bi-directional converter.
EMTP를 이용한 직류배전계통 연계용 양방향 DC/DC 컨버터 모델링
한준(Joon Han),김두웅(Doo-Ung Kim),오윤식(Yun-Sik Oh),권기현(Gi-Hyeon Gwon),노철호(Chul-Ho Noh),정택현(Tack-Hyun Jung),김철환(Chul-Hwan Kim) 대한전기학회 2014 전기학회논문지 Vol.63 No.5
With development of electrical power system, the DC distribution system has been considered as a promising technology to be used in the future smart distribution system. Among the various components comprising the DC distribution system, the bi-directional DC/DC converter is one of the most important equipment to interconnect between main power system and various renewable resources such as photovoltaic power generation, wind power generation, and electrical vehicles. In this paper, a bi-directional DC/DC converter based on three-phases interleaved method which is effective to reduce ripple of input current and output voltage is modeled using ElectroMagnetic Transient Program(EMTP), and the verification of modeled bi-directional DC/DC converter is conducted.
A High Power Density and Efficiency Bi-Directional DC/DC Converter for Electric Vehicles
Xiaoyu Jia,Dehong Xu,Shuailin Du,Changsheng Hu,Min Chen,Ping Lin 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
In electric vehicle systems, bi-directional DC/DC converters are used to interface the battery bank with the high voltage DC bus of the inverter. The high power density and high efficiency are required for bidirectional DC/DC converters. This paper discusses the relationship between switching frequency, inductor value and passive components volume. First, the topologies of the system and the converter are presented. Then, the loss breakdown model is provided. A selection for the switching frequency is presented and an option of inductor value is provided to reduce the converter size and to keep the converter efficient. Then the converter layout which further enhances the power density is discussed. Finally, a high power density and high efficiency converter prototype is built, and the efficiency and thermal performance evaluation of the converter at different operating conditions is given.
Design and Control of Bi-directional DC/DC converter for 30kW fuel cell power system
Xiao Li,Wenping Zhang,Haijin Li,Ren Xie,Dehong Xu 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Fuel cell (FC) power system is considered as an alternative energy power generation system in the future. This paper studies the bidirectional DC/DC converter for a 30㎾ three-phase fuel cell power system. The FC power system is sensitive to load characteristics in stand-alone mode, because rapid change or unbalance of the three-phase load will endanger the safety and expectancy of fuel cell. The bidirectional DC/DC converter with energy storage component is used to provide the dynamic power to avoid fast changing in fuel cell output. In addition, it acts as DC bus capacitors to absorb the low frequency current ripple. Therefore, fuel cell is separated from the low frequency current ripple and large DC bus electrolytic capacitors can be eliminated. Through investigating topology of the bidirectional DC/DC converter, three-level bidirectional DC/DC converter (TLBD) is used for the 30㎾ fuel cell power system. The design and control of the TL-DB is described. TL-DB with its control strategy is verified by the experimental results.
에너지 저장장치를 포함하는 양방향 DC-DC 컨버터 모델링 및 제어기 설계
김승민,양승대,최주엽,최익,안진웅,이상철,이동하 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.3
This paper presents a design and simulation of bi-directional DC/DC boost converter for a fuel cell system. In this paper, we analyze the equivalent model of both a boost converter and a buck converter. Also we propose the controller of bi-directional DC-DC converter, which has buck mode of charging a capacitor and boost mode of discharging a capacitor. In order to design a controller, we draw bode plots of the control-to-output transfer function using specific parameters and incorporate proper compensator in a closed loop. As a result, it has increased PM(Phase Margin) for better dynamic performance. The proposed bi-directional DC-DC converter’s 3pole-2zero compensation method has been verified with computer simulation and simulation results obtained demonstrates the validity of the proposed control scheme.
연료전지·이차전지 하이브리드 시스템을 위한 인터리빙 양방향 DC-DC 컨버터 설계
김승민(Seung-Min Kim),최주엽(Ju-Yeop Choi),최익(Ick Choy),송승호(Seung-Ho Song),이상철(Sang-Cheol Lee),이동하(Dong-Ha Lee) 전력전자학회 2013 전력전자학회 논문지 Vol.18 No.1
Fuel cell power system is one of the most promising energy source for the alternative energy because it has unique advantages such as high energy density, no power drop during operation, and feasible to make compact size. However, due to very low response time, fuel cell is difficult to correspond to drastic load changes and start-up operation. For solving these problem, fuel cell power system must include energy storage device such as Li-Poly battery or super capacitor. Therefore, bi-directional DC-DC converter must be required for this storage device and fuel cell-PCS control. This paper presents a design and modeling of the bi-directional DC/DC converter. Firstly, we present modeling the boost and buck mode of the bi-directional converter through both PWM switch model and state space averaging technique. Secondly, in order to minimize output ripple and transient response overshoot, we have two identical DC-DC converters interleaved and adopt two-loop voltage-current controller. The proposed bi-directional DC-DC converter’s modeling method and control design have been verified with computer simulation and experimentation.
Soft-Switching Bi-directional DC/DC Converter with Active Snubber
Yung-Chun Wu,Zong-You Li 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.1
This paper presents design and implementation of a non-isolated bi-directional DC/DC converter with soft-switching features. In past studies, isolated bi-directional converters with soft-switching features have been widely present, and controlled by phase-shift control or pulse-frequency modulation. In this paper, a non-isolated bi-directional DC/DC converter is proposed. An active snubber is used to obtain soft-switching features in both step-down and step-up conversion. The operational principle of the proposed converter is first described, and its analysis and design are then presented. Finally, a 1kW prototype has been implemented. Hardware measurements have verified its feasibility and the desired features.
Bi‑directional non‑isolated impedance converter for extra low‑voltage battery system safety
Aditya Narula,Vishal Verma 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.8
For bi-directional power converters, modularity, low leakage currents, low ripple, and a simple bi-directional control that utilizes storage eff ectively with low-voltage stress are required. This paper proposes a new configuration for converters that meet all of the above requirements to realize a robust converter for both vehicle to low-voltage DC microgrid (V2G) and low-voltage DC microgrid (LVDC-MG) to vehicle (G2V) technologies. The proposed power-dense modular-impedance source configuration employs coupled inductors, which ensures a power-dense modular architecture configuration with low current ripple and negligible leakage currents. The new auxiliary boost capability of the impedance source provides a wide operating range. A unifi ed bi-directional control algorithm enables operation to/from battery stacks at customized rates, based on the state of charge (SoC). Based on the requirements of the control scheme, this automatically invokes the use of the impedance network to cater to the low charge conditions of the battery stack or the transient conditions on the LVDC microgrid. The proposed bi-directional converter is tested through both simulations and experimental studies on a developed prototype to confirm high efficiency operations over a wide range of duty cycles.