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Comparison of Voltage Source and Current Source Based Converter in 5MW PMSG Wind Turbine Systems
Tahyun Kang,Taewon Kang,Beomseok Chae,Kihyun Lee,Yongsug Suh 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper provides a comparison of power converter loss and thermal description for voltage source and current source type 5MW-class medium voltage topologies of wind turbines. Neutral-point clamped threelevel converter is adopted for voltage source type topology while two-level converter is employed for current source type topology considering the popularity in the industry. In order to match the required voltage level of 4160V with the same switching device of IGCT as in voltage source converter, two active switches are connected in series for the case of current source converter. Transient thermal modeling of a four-layer Foster network for heat transfer is done to better estimate the transient junction and case temperature of power semiconductors during various operating conditions in wind turbines. The loss analysis is confirmed through PLECS simulations. The comparison result shows that VSC-based wind turbine system has a higher efficiency than that of CSC under the rated operating conditions.
PLECS와 RT-Box를 통한 Hardware In the Loop 기반 전력전자 실시간 시뮬레이션
강다현(Tahyun Kang) 대한전기학회 2021 전기의 세계 Vol.70 No.1
본 고에서는 실시간 전력전자 모델링 구성을 위한 시뮬레이션 프로그램 PLECS와 PLECS Coder, RT-Box를 소개한다. This article introduces the power electronic simulation programs PLECS and PLECS Coder and RT-Box for real-time power electronic modeling configurations.
Taewon Kang,Beomseok Chae,Tahyun Kang,Yongsug Suh 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper investigates the design of 3-winding coupled inductor for minimum inductor current ripple in rapid traction battery charger systems. Based on the general circuit model of 3-winding coupled inductor together with the operating principles of dc-dc converter, the relationship between the ripple size of inductor current and the coupling factor for a 3-winding coupled inductor is derived under the different duty ratio. The optimal coupling factor which corresponds to a minimum inductor ripple current becomes -0.5, i.e. a complete inverse coupling without leakage inductance, as the steady-state duty ratio operating point approaches 1/3 or 2/3. In an opposite manner, the optimal coupling factor value of zero, i.e. zero mutual inductance, is required when the steady-state duty ratio operating point approaches either zero or one. Coupled inductors having optimal coupling factor can minimize the ripple current of inductor and battery ripple current resulting in a reliable and efficient operation of battery chargers.
Beomseok Chae,Yongsug Suh,Tahyun Kang 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.5
This paper proposes a three-phase three-switch buck-type converter as the MSC of a wind turbine system. Owing to a novel switching modulation scheme that can eliminate the unwanted diode rectifier mode switching state, the proposed system exhibits a satisfying ac voltage and current waveform quality and torque ripple up to the level of a typical current source rectifier even under a wide power factor operating range. The proposed system has been verified through simulations and HILS tests on a PMSG wind turbine model of 5MW/4160V. The proposed converter has been shown to provide a stator current THD of 3.9% and a torque ripple of 1% under the rated power condition. In addition to the inherent advantage of the reduced switch count of three-phase three-switch buck-type converters, the proposed switching modulation technique can make this converter a viable solution for the MSC placed inside of a nacelle, which is under severe volume, weight and mechanical vibration design limits.
Chae, Beomseok,Suh, Yongsug,Kang, Tahyun The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.5
This paper proposes a three-phase three-switch buck-type converter as the MSC of a wind turbine system. Owing to a novel switching modulation scheme that can eliminate the unwanted diode rectifier mode switching state, the proposed system exhibits a satisfying ac voltage and current waveform quality and torque ripple up to the level of a typical current source rectifier even under a wide power factor operating range. The proposed system has been verified through simulations and HILS tests on a PMSG wind turbine model of 5MW/4160V. The proposed converter has been shown to provide a stator current THD of 3.9% and a torque ripple of 1% under the rated power condition. In addition to the inherent advantage of the reduced switch count of three-phase three-switch buck-type converters, the proposed switching modulation technique can make this converter a viable solution for the MSC placed inside of a nacelle, which is under severe volume, weight and mechanical vibration design limits.
Carrier Based PWM for Three-Phase Three-Switch Buck-Type Rectifier in EV Rapid Charging System
Beomseok Chae,Taewon Kang,Tahyun Kang,Yongsug Suh 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper investigates an economic and highly efficient power converter topology and its modulation scheme for 60kW rapid EV charger system. The target system consists of three-phase three-switch buck-type rectifier topology. A new Carrier Based PWM scheme along with its simple implementation using logic gates is introduced in this paper. This PWM scheme replaces the diode rectifier equivalent switching state with an active switching state producing the effectively same current flowing path. As a result, the distortion of input current during the polarity reversal of capacitor line voltage can be mitigated. The proposed modulation technique is confirmed through simulation verification. The proposed modulation technique and its implementation scheme can expand the operation range of the three-phase three-switch buck-type rectifier having ac input and capacitor ripple current of high quality.