• 한국신재생에너지학회:학술대회논문집
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• 2011.11a
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• pp.50.1-50.1
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• 2011

전력수요가 적을 때 잉여전력을 저장하고 전력수요가 많은 시간대나 전기료가 비싼 시간대에 저장된 전력을 사용함으로서 전력의 활용 효율을 높이고, 전력공급 시스템을 안정화하기 위해 에너지저장시스템의 연구가 최근에 활발히 진행되고 있다. 또한 공장, 산업용빌딩이나 병원 등 고르고 안정적인 전력의 수요는 늘어나고 있으며, 화석 연료 고갈 문제로 인한 신재생에너지 발전의 중요성도 대두되고 있다. 본 논문에서는 무정전 전원장치, 태양광발전시스템, 에너지 저장 시스템을 모두 통합하였다. 제안한 시스템은 3상 인버터, 부스트 컨버터, 양방향 컨버터, 사이리스터 스위치로 구성된다. 인버터는 계통과 연계되거나 UPS 동작 시 AC 전력을 만든다. 부스트 컨버터는 태양광 패널과 연결되어 MPPT 제어를 수행한다. 양방향 컨버터는 잉여전력을 배터리에 저장을 하고, 전력이 부족할 시에는 배터리의 전력을 방전한다. 사이리스터 스위치는 정전 시 계통과 부하를 끊어주는 역할을 한다. 본 논문에서는 15kW급 시스템으로 구현하여 검증하였다.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 1998.11a
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• pp.186-191
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• 1998

• Journal of Industrial Technology
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• v.40 no.1
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• pp.13-18
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• 2020

Lithium-ion batteries have a small volume, light weight and high energy density, maximizing the utilization of mobile devices. It is widely used for various purposes such as electric bicycles and scooters (e-Mobility), mass energy storage (ESS), and electric and hybrid vehicles. To date, lithium-ion batteries have grown to focus on increasing energy density and reducing production costs in line with the required capacity. However, the research and development level of lithium-ion batteries seems to have reached the limit in terms of energy density. In addition, the charging time is an important factor for using lithium-ion batteries. Therefore, it was urgent to develop a high-speed charger to shorten the charging time. In this thesis, a discharger was fabricated to evaluate the capacity and characteristics of Li-ion battery pack which can be used for e-mobility. To achieve this, a smart discharger is designed with a combination of active load, current sensor, and temperature sensor. To carry out this thesis, an active load switching using sensor control circuit, signal processing circuit, and FET was designed and manufactured as hardware with the characteristics of active discharger. And as software for controlling the hardware of the active discharger, a Raspberry Pi control device and a touch screen program were designed. The developed discharger is designed to change the 600W capacity battery in the form of active load.

• Proceedings of the KIPE Conference
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• 1998.07a
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• pp.433-437
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• 1998

Equalize SOC of the cell which effect on the charge.discharge ability and the efficiency of the battery, through the charge.discharge characteristic test of the battery source, and develope the high efficiency charge.discharge system in the series HEV have a constant engine-generator output. For this, in this paper, establish the electrical model and the condition of high efficiency charge.discharge, and proposed the improvement method of charge.discharge characteristic in the battery source that consist of twenty Ni-MH cells connected serial/parallel

• Journal of the Korean Society of Industry Convergence
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• v.26 no.1
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• pp.27-34
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• 2023

This study conducted a study on a small-capacity PCS using lithium-ion batteries used in personal mobility. Most of the batteries in Personal Mobility only charge with external chargers and are used only as mobile energy sources. However, this paper aims to charge the battery of PM using PV and system power or to use the charged power as a stand-alone power supply. The developed PCS can be operated as a two-channel battery charger/discharger, a battery charger using solar power, and a stand-alone solar inverter depending on the operation method. The validity of the manufactured small-capacity PCS was verified through experiments.

• Proceedings of the KIPE Conference
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• 2013.11a
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• pp.184-185
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• 2013

본 논문은 1.8MW 급 ESS용 배터리 충방전기 개발에 관한 논문이다. 제안된 회로의 구성은 삼상 교류 입력을 받아 DC 1150V로 변환시키는 3상 AC/DC 컨버터부와 배터리를 충전과 방전시키는 buck-boost 컨버터부로 구성된다. 출력은 최대 900V, 2000A 이며 C/C, C/V, C/P 모드로 제어된다. 3상 AC/DC 컨버터는 역률을 개선하고, 입력 고조파를 저감시킬 수 있으며, 계통으로 회생이 가능하다는 장점이 있다. 시뮬레이션 및 실험을 통하여 배터리 충방전기의 성능을 검증하였으며, 실제 시스템에 적용하여 충전 및 방전 시험을 완료하였다.

• Proceedings of the KIPE Conference
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• 2011.11a
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• pp.199-200
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• 2011

Uninterruptible Power Supply(UPS) is largely divided into passive-standby, line-interactive and double-conversion methods. This paper proposes the double-conversion UPS for low cost and high performance. The proposed UPS are composed of PFC, inverter, battery charger and discharger. Finally, the validity of proposed UPS was verified by experiments.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.899_900
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• 2009

본 논문에서는 다모듈 다위상 양방향 배터리 충방전 회로의 소신호 특성을 해석하여, 적절한 제어기 및 보상기 회로설계를 제안한다. 제안된 회로를 바탕으로 폐루프 응답 특성을 시뮬레이션과 측정을 하여 분석하고 검증한다. 최종적으로 설계된 제어기를 적용하여 양방향 배터리 충방전 회로를 동작 시켜봄으로써 안정성과 부하변동에 따른 응답 특성을 관측해 본다.

• Journal of Power Electronics
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• v.12 no.3
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• pp.487-494
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• 2012

A new low cost high power density photovoltaic power conditioning system (PV PCS) with an energy storage system is proposed in this paper. Its high power density and cost effectiveness can be achieved through the unification of the maximum power point tracker and the battery charger/discharger. Despite the reduced power stage, the proposed system can achieve the same performance in terms of maximum power point tracking and battery charging/discharging as the conventional system. When a utility power failure happens, the proposed system cannot perform maximum power point tracking at the UPS mode. However, the predetermined battery voltage near the maximum power point of the PV array can effectively generate a reasonable PV power even at the UPS mode. Therefore, it features a simpler structure, less mass, lower cost, and fewer devices. Finally, to confirm the operation, validity, and features of the proposed system, a theoretical analysis and experimental results from a single phase AC 220Vrms/1.5kW prototype are presented.

• Journal of Power Electronics
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• v.15 no.3
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• pp.695-701
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• 2015

Uninterruptible Power Supplies (UPSs) can be largely divided into the passive-standby, line-interactive and double-conversion methods. This paper proposes a double-conversion UPS with a low cost and high performance. This single phase UPS uses a single-loop robust voltage controller and 1-switch voltage doubler strategy PFC. The proposed UPS is composed of a single phase PFC, a half-bridge inverter, a battery charger and a battery discharger. Finally, the validity of proposed UPS was verified by various experimental tests.