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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.
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.
브레이크 액 압축률 특성 반영 사실적 소요액량 해석 위한 방법론
김범석(Beomseok Kim),문학봉(Hakbong Mun),박주상(Joosang Park),서병국(Byungguk Suh) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
일정 감속도 발생 위해 캘리퍼 내부로 인가되는 브레이크 액 체적인 소요액량은 캘리퍼 성능 주요 특성 중 하나이다. 그러므로 개발 되는 모든 캘리퍼의 소요액량은 DV, PV 기본 성능으로서 시험 평가 되며, 소요액량 특성은 설계 단계부터 정밀한 선행 해석 예측이 매우 중요하다. 하지만 소요 액량 해석 예측은 실제 시험 결과와는 경향 및 값에서 다르게 나타나는 것이 현재 Global 수준이며 이러한 차이를 만들어 내는 원인 조차 알지 못하고 있으며, 해석 결과는 단지 캘리퍼의 구조 강성 대소 비교로만 활용되고 있는 현실이다. 본 연구에서는 현재 사용되고 있는 일반 브레이크 액의 압축률 측정으로 순수 브레이크 액의 특성을 밝히고, 본 연구에서는 현재 사용되고 있는 일반 브레이크 액의 압축률 측정으로 순수 브레이크 액의 특성을 밝히고, Bleeding 영향성 고찰을 통해 실제 소요액량 시험에서 보이는 비선형 현상의 원인을 명확히 규명하며, 시험적 검증/반증 하여, 시험과 해석 간 괴리의 원인을 밝혔다. 또한 밝혀진 메커니즘을 적용하기 위하여 새로운 소요액량 해석 적용 Logic을 개발하였으며, 이를 Abaqus/Subroutine을 통해 구현하였다. 결론적으로 캘리퍼의 소요액량 현상을 전 압력 영역에 있어서 높은 신뢰성과 함께 사실적으로 해석 할 수 있는 해석 process를 구축하였다.
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.
Chae, Beomseok,Min, Juhwa,Suh, Yongsug,Kim, Hyejin,Kim, Hyunbae The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.5
This paper proposes a current source-type pulse generator circuit to improve load voltage waveforms by solving the voltage ringing problem of capacitively coupled plasma systems. The voltage source-type pulse power supplies used in the plasma industry have short-circuit currents and voltage ringing problems with capacitively coupled plasma loads. The current source-type pulse generator proposed in this paper can solve these problems. The proposed circuit consists of four detailed circuits: bias current generator, bias current modulator, slope current generator, and slope current modulator. They form two constant currents at the DC link, and output two pulse currents to the load. These output currents contribute to generating the plasma load voltage required by the capacitively coupled plasma process. The proposed circuit is verified by a PLECS simulator and a laboratory-scale hardware system. To check the improvement of the output waveform, a voltage source-type pulse generator and the current source-type pulse generator are tested under the same experimental conditions. The results are represented by load voltage and current waveforms. In addition, the entire system of the current source-type pulse generator is designed and verified by simulation and experimental results. The resulting output waveforms meet the process requirements, and the obtained results demonstrate that the proposed current source-type pulse generator circuit can be suitably used for capacitively coupled plasma loads.