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전기 자동차의 DC 배전 시스템을 위한 양방향 DC/DC 컨버터의 제어
장한솔(Han-Sol Chang),이준민(Joon-Min Lee),김춘택(Choon-Tack Kim),나재두(Jae-du La),김영석(Young-Seok Kim) 대한전기학회 2013 전기학회논문지 Vol.62 No.7
Recently, an electric vehicle (EV) has been become a huge issue in the automotive industry. The EV has many electrical units: electric motors, batteries, converters, etc. The DC distribution power system (DPS) is essential for the EV. The DC DPS offers many advantages. However, multiple loads in the DC DPS may affect the severe instability on the DC bus voltage. Therefore, a voltage bus conditioner (VBC) may use the DC DPS. The VBC is used to mitigate the voltage transient on the bus. Thus, a suitable control technique should be selected for the VBC. In this research, Current controller with fixed switching frequency is designed and applied for the VBC. The DC DPS consist of both a resistor load and a boost converter load. The load variations cause the instability of the DC DPS. This instability is mitigated by the VBC. The simulation results by Matlab simulink and experimental results are presented for validating the proposed VBC and designed control technique.
태양광 발전 시스템에서 DC-DC 컨버터를 이용한 태양광 모듈의 출력 제어
장한솔(Han-Sol Chang),이병헌(Byung-Hun Lee),석봉준(Bong-Jun Seok),나재두(Jae-Du La),김영석(Young-Seok Kim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
태양광 발전 시스템에서 부하가 증가 또는 순간적인 변동 등의 경우 전압과 전류의 변동이 발생하므로 태양광 어레이의 출력 제어가 필수적이다. 따라서 일정한 전압을 공급하기 위해 DC-DC 컨버터를 사용하여 전압변동을 보상할 수 있다. 이 논문에서는 부하의 변동이 발생했을 때 boost 컨버터를 사용하여 전압변동에 신속하게 대응 할 수 있도록 피드백 보상회로를 설계하였으며 이것을 PSIM을 사용한 모의실험으로 컨버터의 동작을 확인하고 시스템의 타당성을 입증하였다.
병렬 펄스 부하를 갖는 직류 전력시스템을 위한 Voltage Bus Conditioner의 전류 센서 없는 제어
이병헌(Byung-Hun Lee),장한솔(Han-Sol Chang),나재두(Jae-Du La),김영석(Young-Seok Kim) 대한전기학회 2012 전기학회논문지 Vol.61 No.11
A DC power system has many loads with varied functions. Also, there may be large pulsed loads with short duty ratios which can affect the normal operation of other loads. In this paper, Voltage Bus Conditioner(VBC) without any current sensors is proposed to damp the bus voltage transients by parallel pulsed loads. The proposed control approach requires only one voltage sensor and carries out both the functions of damping the bus voltage transients and maintaining the level of energy stored. The proposed control technique has been implemented on a TMS320F2812 Digital Signal Processor(DSP). Simulated results by a Matlab Simulink and experimental results are presented which verify the control principles and demonstrate the practicalty of the approach.
병렬펄스부하를 갖는 직류배전시스템을 위한 능동 공진 댐퍼에 대한 연구
나재두(Jae-Du La),이병헌(Byung-Hun Lee),장한솔(Han-Sol Chang),우현민(Hyun-Min Woo),김영석(Young-Seok) 대한전기학회 2012 전기학회논문지 Vol.61 No.9
An active resonance damper for a DC Distributed Power System(DPS) with parallel loads is presented. Each pulse power load in a DC DPS comprises both a resistive power load and a step-up converter. The step-up converter behave as constant power load(CPL) when tightly regulated and usually cause a negative impedance instability problem. Furthermore, when an input filter is connected to a large constant power load, the instability of DC bus voltage. In this paper, a bidirectional DC/DC converter with a reduced storage capacitor quantitatively are proposed as a active resonance damper, to mitigate the voltage instability on the bus. The validity of the proposed method was confirmed by simulation and experimental works.
우현민(Hyun-Min Woo),이병헌(Byung-Hun Lee),장한솔(Han-Sol Chang),나재두(Jae-Du La),김영석(Young-Seok Kim) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
In recent years many researches for DC power distributed system (PDS) are being preformed and the importance of the DC PDS is more and more emphasized. Furthermore in the railway system the DC PDS is used in subway station lighting facilities etc. In the DC PDS DC bus voltage instability may be occurred by the operation of multiple parallel loads such as pulsed power load motor drive system and constant power loads. Thus good quality and high reliability for electric power are required and voltage bus conditioner (VBC) may be used the DC PDS. The VBC is a DC/DC converter for mitigation of the bus transients. In this paper adaptive controller is designed. The simulation results by PSIM are presented for validating the proposed control algorithm.