• 전력전자학회:학술대회논문집
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• 전력전자학회 2015년도 추계학술대회 논문집
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• pp.191-192
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• 2015

본 논문에서는 3상 인터리브드 양방향 DC-DC 컨버터의 상제어 스위칭 기법을 이용하여 부하의 변동에 따라 2상 또는 3상 인터리빙이 되도록 하는 시스템 설계방법을 제시한다. 3[kW] 시스템에 대하여 전류 임계모드가 되도록 하는 인덕턴스 값을 유도하였으며 2상으로 동작 시 최대 전력 구간 범위를 구하고 시뮬레이션을 통하여 제안한 방식의 타당성을 입증하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2019년도 전력전자학술대회
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• pp.443-444
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• 2019

DC마이크로그리드에서, 양방향 컨버터를 통한 계통과 배터리와의 전력교환은 필수적으로 요구 된다. 일반적으로 계통이 연결 되었을 때 배터리를 충전시키고, 계통이 끊어 졌을 때는 배터리를 통해 계통에 전력을 공급하는 양방향 동작을 한다. 이러한 전력방향전환 과도상태를 줄이기 위해 무순단 절체 기능이 필요한데, 전류 제어기를 공유하는 방식의 경우 전압제어기의 포화가 발생하면 양방향 컨버터의 출력응답이 늦어지거나, 출력이 불안정해 진다. 이 문제를 해결하기 위해 양방향 컨버터의 대표적인 포화방지(Anti-windup)기법을 적용하여 성능을 비교하였다. 또한 PSIM 소프트웨어를 통해 DC마이크로그리드 시스템을 구현해 효과를 확인한다.

• 산업기술연구
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• 제25권B호
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• pp.203-210
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• 2005

The PWM(Pulse Width Modulated) converter for the AC to DC rectification has become attractive in the industrial variable-speed drive application and the electric utilities due to the following benefits: Nearly the sinusoidal input current with unity power factor; Controllable DC link voltage; Bidirectional power flow. This paper presents a quantitative analysis of single and three phase PWM converter's input and output characteristics as a function of the input filter inductance under balanced and unbalanced conditions. Also, its performance under the supply voltage including harmonics is investigated by simulation with Matlab Simlulink and experiments. These results provide a reference for selecting the reasonable converter's input filter inductance for given harmonics or power factor criterion.

• Journal of Electrical Engineering and Technology
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• 제13권1호
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• pp.326-332
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• 2018

In this paper, the design process and the control method of the power conversion system (PCS) that consists of a bidirectional DC-DC converter and a 3-level T-type inverter for an energy storage system is presented. Especially the design method of the output LCL filter for a 3-lvel T-type inverter without complex mathematical process are proposed. The validity of the control method and design process in this paper are verified through simulation and experimental analysis.

• 전력전자학회논문지
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• 제21권4호
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• pp.335-342
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• 2016

This paper proposes an energy storage-assisted, series-connected module-integrated power conversion system that integrates a photovoltaic power conditioner and a charge balancing circuit. In conventional methods, a photovoltaic power conditioner and a cell-balancing circuit are needed for photovoltaic systems with energy storage devices, but they cause a complex configuration and high cost. Moreover, an imbalanced output voltage of the module-integrated converter for PV panels can be a result of partial shading. Partial shading can lead to the fault condition of the boost converter in shaded modules and high voltage stresses on the devices in other modules. To overcome these problems, a bidirectional buck-boost converter with an integrated magnetic device operating for a charge-balancing circuit is proposed. The proposed circuit has multiple secondary rectifiers with inductors sharing a single magnetic core, which works as an inductor for the main bidirectional charger/discharger of the energy storage. The secondary rectifiers operate as a cell-balancing circuit for both energy storage and the series-connected multiple outputs of the module-integrated converter. The operating principle of the cell-balancing power conversion circuit and the power stage design are presented and validated by PSIM simulation for analysis. A hardware prototype with equivalent photovoltaic modules is implemented for verification. The results verify that the modularized photovoltaic power conversion system in the output series with an energy storage successfully works with the proposed low-cost bidirectional buck-boost converter comprising a single magnetic device.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2019년도 전력전자학술대회
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• pp.74-76
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• 2019

This paper proposes an open-switch fault tolerant strategy based on the model predictive control for a full bidirectional switches indirect matrix converter (FBS-IMC). Compared to the conventional Indirect Matrix Converter (IMC), the FBS-IMC can provide healthy current path when open-switch fault is occurred. To keep the continuous operation, the fault tolerant strategy is developed by means of reversing the DC-link voltage polarity regardless of the faulty switch location in the rectifier or inverter stage. Therefore, the proposed control strategy can maintain the same input and output performances during the faulty condition as the normal condition. The simulation results are given to verify the effectiveness of the proposed strategy.

• 전기학회논문지
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• 제59권12호
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• pp.2195-2201
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• 2010

The VBC(Voltage Bus Conditioner) is a bidirectional DC-DC converter with the energy storage for damping the instability and any transients of bus voltage in the DC DPS(Distributed Power System). This paper presents the PI(Proportional Integration) controller for the VBC. The PI controller is not only damping the bus transient, but also keeping the storage voltage level. Matlab Simulink simulation and experimental results are presented by validity of the proposed control technique.

• 전기학회논문지
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• 제61권11호
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• pp.1617-1624
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• 2012

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.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2011년도 전력전자학술대회
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• pp.340-341
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• 2011

본 논문에서는 높은 승 강압비를 갖는 양방향 DC-DC 컨버터에 대한 최적의 스위칭 기법을 제안한다. 제안한 컨버터는 CCM에서도 소프트 스위칭이 가능하여 스위칭 손실뿐만 아니라 인덕터의 발열도 줄일 수 있다. 또한 모든 소자의 전압 정격과 수동소자의 부피도 기존 양방향 컨버터 보다 작아 고효율 및 고전력밀도의 달성을 기대 할 수 있다. 1.5kW 시작품의 실험을 통해 본 논문의 타당성을 검증하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2011년도 전력전자학술대회
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• pp.518-519
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• 2011

오늘날 스마트 그리드, 하이브리드 자동차 등에 관한 연구가 활발히 진행됨에 따라 에너지 저장장치에 관한 관심이 높아지고 있다. 그 중 연구가 활발히 진행되어지고 있는 배터리인 Ni-Mh와 Li-polymer의 모델링한 연구에 대하여 시뮬레이션을 하였고 모델링 방법과 성능에 대하여 비교하여 보았다.