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Byen, Byeng-Joo,Ban, Chung-Hwan,Lim, Young-Bae,Choe, Gyu-Ha The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.6
In order to control the output voltage in a dual active bridge converter, this paper establishes a theoretical inductor current equation for a dual-pulse-width-modulation scheme that ensures low switching loss. It also proposes a modulation strategy that minimizes conduction loss. When compared to the conventional single-pulse-width-modulation strategy, the proposed approach can reduce the inductor current RMS and improve efficiency in the low power region, as verified through simulation and experimental results.
Byen, Byeng-Joo,Choe, Jung-Muk,Choe, Gyu-Ha The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.4
This study proposes high-performance voltage controller design that employs a capacitor current control model for single-phase stand-alone inverters. The single-phase stand-alone inverter is analyzed via modeling, which is then used to design the controller. A design methodology is proposed to maximize the bandwidth of the feedback controller. Subsequently, to compensate for the problems caused by the bandwidth limitations of the controller, an error transfer function that includes the feedback controller is derived, and the stability of the repetitive control scheme is evaluated using the error transfer function. The digital repetitive controller is then implemented. The simulation and experimental results show that the performance of the proposed controller is high in a 1.5 kW single-phase stand-alone inverter prototype.
Single Pulse-Width-Modulation Strategy for Dual-Active Bridge Converters
Byen, Byeng-Joo,Jeong, Byong-Hwan,Choe, Gyu-Ha The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.1
This paper describes a single pulse-width modulation control strategy using the Single Pulse-Width Modulation (SPWM) method with a soft-switching technique for a wide range of output voltages from a bidirectional Dual-Active Bridge (DAB) converter. This method selects two typical inductor current waveforms for soft-switching, and proposes a rule that makes it possible to achieve soft-switching without any compensation algorithm from the waveforms. In addition, both the step-up and step-down conditions are analyzed. This paper verifies that the leakage inductance is independent from the rule, which makes it easier to apply in DAB converters. An integrated algorithm, which includes step-up and step-down techniques, is proposed. The results of experiments conducted on a 50-kW prototype are presented. The system efficiency is experimentally verified to be from 85.6% to 97.5% over the entire range.
변정희(Byen Jung-Hee),신유림(Shin Yoo-Lim) 가톨릭대학교 생활과학연구소 2006 생활과학연구논집 Vol.26 No.1
The purpose of this study was to explore practical and effective traffic safety education from the analysis of the teachers" demands for and the actual conditions of traffic safety education in early childhood education centers.<BR> The data were collected from a sample of 221 teachers in kindergartens and daycare centers in Seoul. Teachers" knowledge of traffic safety, the actual conditions of traffic safety education, and teachers" needs of traffic safety education were examined. The results showed that the demands of traffic safety education contents are different from the actual conditions.
Dual SRF based Torque Ripple Mitigation Strategy for a Fault Tolerant PMSM Drive System
Byeng-joo Byen,Seunghoon Baek,Younghoon Cho,Gyu-Ha Choe 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper presents a torque ripple mitigation strategy for the fault tolerant permanent magnet synchronous motor (PMSM) drive system, in which an auxiliary phase is employed. It is shown that the torque ripple whose frequency is twice the fundamental frequency is induced in the PMSM undergoing an open circuit fault on a certain phase. In order to compensate the torque ripple, current controllers are implemented in the dual synchronous reference frame (SRF), in which the rotating frequencies of the two SRF are different. In more detail, one of the SRFs rotates in two times of the fundamental frequency to actively compensate the torque ripple in the steady state while another one is synchronized to the fundamental component. Compared to traditional methods, the proposed algorithm effectively extends the operating speed of the PMSM where the torque ripple can be compensated. Both the simulations and the experimental results confirm the usefulness of the proposed torque ripple mitigation strategy.
Byeng-Joo Byen,Chung-Hwan Ban,Young-Bae Lim,Gyu-Ha Choe 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.6
In order to control the output voltage in a dual active bridge converter, this paper establishes a theoretical inductor current equation for a dual-pulse-width-modulation scheme that ensures low switching loss. It also proposes a modulation strategy that minimizes conduction loss. When compared to the conventional single-pulse-width-modulation strategy, the proposed approach can reduce the inductor current RMS and improve efficiency in the low power region, as verified through simulation and experimental results.
Single Pulse-Width-Modulation Strategy for Dual-Active Bridge Converters
Byeng-Joo Byen,Byong-Hwan Jeong,최규하 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.1
This paper describes a single pulse-width modulation control strategy using the Single Pulse-Width Modulation (SPWM) method with a soft-switching technique for a wide range of output voltages from a bidirectional Dual-Active Bridge (DAB) converter. This method selects two typical inductor current waveforms for soft-switching, and proposes a rule that makes it possible to achieve soft-switching without any compensation algorithm from the waveforms. In addition, both the step-up and step-down conditions are analyzed. This paper verifies that the leakage inductance is independent from the rule, which makes it easier to apply in DAB converters. An integrated algorithm, which includes step-up and step-down techniques, is proposed. The results of experiments conducted on a 50-kW prototype are presented. The system efficiency is experimentally verified to be from 85.6% to 97.5% over the entire range.