• 전력전자학회논문지
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• 제18권1호
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• pp.63-71
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• 2013

This paper describes the coordinated droop control method for stand-alone type DC micro-grid to improve reliability and utilization of distributed generations and energy storage. The stand-alone type DC micro-grid consists of several distributed generations such as a wind power generation, solar power and micro-turbine, and energy storage. The proposed method which is based on autonomous control method shows high reliability and stability through coordinated droop control of distributed generations and energy storage and also capability of battery management. The operation of stand-alone type DC micro-grid was analyzed using detail simulation model with PSCAD/EMTDC software. Based on simulation results, a hardware simulator was built and tested with commercially available components and performance of system was verified.

• 전력전자학회논문지
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• 제4권1호
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• pp.57-65
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• 1999

본 논문은 충방전 제어기를 사용한 독립형 태양광 발전시스템을 다루고 있다. 독립형 태양광 발전시스템의 주전원은 일반적으로 태양전지와 배터리이다. 그러므로 독립형 태양광 발전시스템은 배터리와 태양전지와의 결선에 따라서 다양한 형태로 구분할 수 있다. 그중 주로 사용되는 결선은 태양전지와 배터리를 직접 연결하는 것으로 단순하고 간결한 구조를 갖는 이점이 있다. 그러나 그러한 시스템은 배터리와 솔라셀 사이의 전압불균형으로 인한 손실을 갖는다. 그러므로 태양전지를 최대전력점으로 운전할 수 있는 충방전 제어기를 갖는 독립형 태양광 발전시스템을 제안하여 순시치제어기로 설계하였다. 시스템의 동작특성을 실험실의 초기 시작품으로 검증되었다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2002년도 추계학술대회 논문집
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• pp.65-68
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• 2002

Most of the present demand in the world is met by fossil and nuclear power plants. A small part is met by renewable energy technologies. Among the renewable power sources, wind and solar energy have experienced a remarkably rapid growth in the past 10 years. Recently the utilization of wind power has been receiving close attention in this country, especially for the electrification of off-shore islands. The objective of this study is to demonstrate a small wind energy system as a stand-alone power source.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2003년도 추계학술대회 논문집
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• pp.206-209
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• 2003

This paper deals with stand-alone PV power generation system with charge and discharge controller for the LED road sign. Main power source of PV system are generally solar cell and battery. Therefore PV system can be classified into variable types in accordance with connection type between battery and solar sell. Mainly used on of them is direct connection type which has advantage such as simple structure and simple controller. To verify the proposed PV generation system for the LED road sign, the detail simulation and experiment results indicate that operating characteristics are verified by experiment with a laboratory prototype in this paper.

• 한국전자통신학회논문지
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• 제10권4호
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• pp.527-532
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• 2015

국내 섬지역의 전력 수급은 계통 연계가 어려워 일반적으로 디젤 발전기에 의존하고 있어 관리 비용이 매우 높다. 이러한 문제를 해결하기 위해 최근 계통 독립형 마이크로그리드 기술에 대한 연구 및 실증이 활발히 진행 중이다. 본 논문은 에너지 자립섬을 위한 계통 독립형 마이크로그리드 통합 모니터링 시스템을 제안한다. 먼저 태양광, 풍력, 디젤 발전설비, 송 배전망의 상태 및 부하, 그리고 에너지 저장 시스템의 모니터링을 위한 소프트웨어 시스템 아키텍처를 설계한 후 관리자가 쉽게 파악할 수 있는 모니터링 소프트웨어를 구현한다. 구현된 모니터링 소프트웨어는 발전설비의 상태 및 오류를 실시간으로 시각화함으로써 관리자의 신속한 의사 결정이 가능하다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2011년도 추계학술대회
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• pp.267-268
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• 2011

In order to increase the efficiency of the PV solar can get maximum power output from a control is up. But MPPT request Converter since Solar module always work MPP about out condition. This paper study of 170W stand-alone PV MPPT system for charge and discharge control system of the battery. The proposed system is a way of Flyback converters, and controls the algorithm used P&O control method and ATmega128.

• 디지털산업정보학회논문지
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• 제12권3호
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• pp.231-257
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• 2016

Several efforts to replace the use of existing fossil energy resources have already been made around the world. As a result, a new industry of renewable energy has been created, and efficient energy distribution and storage has been promoted intensively. Among the newly explored renewable energy sources, the most widely used one is solar energy generation, which has a high market potential. An energy storage system (ESS) is a system as required. In this paper, the design and implementation of an ESS for the efficient use of power in stand-alone street lights is presented. In current ESS applied to stand-alone street lights, either 12V~24V DC (from solar power) or 110V~220V AC (from commercial power) is used to recharge power in systems with lithium batteries. In this study, an ESS that can support both solar power and commercial power was designed and implemented; it can also perform emergency recharge of portable devices from solar powered street lights. This system can maximize the scalability of ESSes using lithium batteries with efficient energy conversion, with the advantage of being an eco-friendly technology. In a ripple effect, it can also be applied to smart grids, electric vehicles, and new, renewable storage markets where energy storage technology is required.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2002년도 전력전자학술대회 논문집
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• pp.58-62
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• 2002

The MPPT methods is used to get the maximum energy from the limited size of a photovoltaic array. This study deals with the suitable MPPT method of solar lighting lamp and the improved charge and discharge characteristics. So we proposed the control algorithm for stand-alone photovoltaic array(SPVS). The result of experiment is presented the improved charge characteristics and the charge and discharge times reduction, the depth of discharge control. so, the system stabilization goes up. It is possible economical effect to apply for solar lighting lamp used photovoltaic array

• 전력전자학회:학술대회논문집
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• 전력전자학회 1999년도 전력전자학술대회 논문집
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• pp.419-422
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• 1999

This paper deals with stand-alone Photovoltaic system(SPVS) with charger/discharge controller. Main power source of SPVS are generally solar cel and battery. Therefore SPVS can be classified into variable types in accordance with connection type between battery and solar cell. SPVS with charger/discharge controller which can operate solar cell a maximum power point is suggested and designed with instantaneous controller. And system operating characteristics are verified by experiment with a laboratory prototype in this paper.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2009년도 춘계학술대회 논문집
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• pp.73-76
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• 2009

Generally, wind or solar power system is operated as a stand-alone power system, the efficiency of which could be higher by designing wind-solar combined system considering average wind speed and solar radiation of the desert region, Mongolia. This system is designed to generate electricity for power users and pumps the ground water for irrigation using deep well pump. The ground water can be used for farming or forestation where there is no or little irrigation system. In connection with this study, a renewable energy park, Green Eco Energy Park, was developed at about 50km east of Ulaanbaatar. 3 sets of 10kW wind power generator and 70 kW of solar power module were installed there. The electricity generated from the system is used to on-site office building and deep well pump for ground water pumping. A 10kW stand-alone solar pumping system, which has no rechargeable battery system, is installed to pump the ground water with the amount of generated power. The ground water is stored in 3 artificial ponds and then it is used for raising nursery tree and farming. The purpose of this study is to provide a possible energy solution to desert regions where there is no or little power system. The system also supply power to ground water pump, and the water can be used for farming and forestation, which will also be a solution of preventing desertification or spreading of desert area.