• 항공우주산업기술동향
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• 제7권2호
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• pp.33-39
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• 2009

1968년 미국의 피터 글레이저 박사가 정지궤도에 위성을 띄워 태양 에너지를 직접 받아 전기로 변환하여 지구로 송전하는 거대한 태양광위성의 개념을 소개한 바 있다. 이에 대해 미국, 일본, 유럽 등에서는 우주태양광 발전을 미래의 새 에너지원으로 주목하여 활발한 기초 연구와 개념 설계 그리고 최근에는 본 사업의 실현을 위한 구체적인 방안까지 발표하고 있는 실정이다. 현재 우주태양광발전 기술은 계속 개발 중으로 미국과 일본에 서는 2030 년경에 실용화할 계획으로 있다. 본 논문에서는 그린에너지와 새 에너지원으로 주목받고 있는 우주 태양광발전에 대한 선진국의 기술 동향 및 국내의 추진 전략에 대하여 기술하였다.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2008년도 춘계학술발표대회 논문집
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• pp.37-42
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• 2008

Since the solar radiation is the main input for sizing any solar photovoltaic system, it will be necessary to understand and evaluate the solar radiation data. The works presented here is the analysis of solar radiation data for East-North Asia areas. The data utilized in the analysis consist of the global radiation on horizontal surface, measured at 2 different stations during 3 years for the period from 2002 to 2004 and estimated using satellite at 27 different stations over the China and Mongolia. Also the measured data has been collected at 16 different stations all of the South Korea and estimated using satellite at 12 different stations over the North Korea from 1982 to 2005. The Result of analysis shows that the annual-average daily global radiation on the horizontal surface is 3.57 $MJ/m^2$. We conclude, based on the analysis, that East-North Asia areas have sufficient solar energy resources for the photovoltaic power generation system.

• 한국태양에너지학회 논문집
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• 제27권3호
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• pp.95-105
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• 2007

Since the solar radiation is the main input for sizing any solar photovoltaic system, it will be necessary to understand and evaluate the solar radiation data. The works presented here is the analysis of solar radiation data for East-North Asia areas. The data utilized in the analysis consist of the global radiation on horizontal surface, measured at 2 different stations during 3 years for the period from 2002 to 2004 and estimated using satellite at 27 different stations over the China and Mongolia. Also the measured data has been collected at 16 different stations all of the South Korea and estimated using satellite at 12 different stations over the North Korea from 1982 to 2005. The Result of analysis shows that the annual-average daily global radiation on the horizontal surface is $3.57\;MJ/m^2$. We conclude, based on the analysis, that East-North Asia areas have sufficient solar energy resources for the photovoltaic power generation system.

• 항공우주시스템공학회지
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• 제8권1호
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• pp.42-47
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• 2014

The role of Electrical Power Subsystem (EPS) is to generate a power and distribute it to the electrical devices for the system operation. For on-orbit operation of cube satellite, it is also necessary to supply power to on-board mission devices as commercial satellite does. Recently, commercial EPS products dedicated for the cube satellite application has been developed and widely used for the power subsystem design. In this paper, a permanent magnet attitude stabilization method without external power has been introduced because it has advantage from power consumption point of view and the EPS design of cube satellite by applying the commercial EPS products has been introduced and investigated. This paper also deals with the specification of the commercial EPS products for the beginner of the cube satellite design.

• Journal of Power Electronics
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• 제11권6호
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• pp.870-879
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• 2011

Regulated peak power tracking (RPPT) systems such as the series structure and the series-parallel structures are commonly used in satellite space power systems. However, these structures process the solar array power or the battery power to the load through two cascaded regulators during one orbit cycle, which reduces the energy transfer efficiency. Also the battery charging time is increased due to placement of converter between the battery and the solar array. In this paper a parallel structure has been proposed which can improve the energy transfer efficiency and the battery charging time for satellite space power RPPT systems. An analogue controller is used to control all of the required functions, such as load voltage regulation and solar array stabilization with maximum power point tracking (MPPT). In order to compare the system efficiency and the battery charging efficiency of the proposed structure with those of a series (conventional) structure and a simplified series-parallel structure, simulations are performed and the results are analyzed using a loss analysis model. The proposed structure charges the battery more quickly when compared to the other two structures. Also the efficiency of the proposed structure has been improved under different modes of solar array operation when compared with the other two structures. To verify the system, experiments are carried out under different modes of solar array operation, including PPT charge, battery discharge, and eclipse and trickle charge.

• 항공우주시스템공학회지
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• 제17권1호
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• pp.88-96
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• 2023

우리나라에서 개발 중인 저궤도 위성은 아리랑 위성으로, 이제까지 꾸준한 성능향상이 있었다. 이때 탑재체의 성능향상에 따른 탑재체의 전력요구도는 늘어나게 되었고 이에 위성 내부 전력 공급장치의 설계 및 Solar Array의 구성 등 위성 설계가 달라진다. 이에 따라 위성에 전력을 공급하며 위성 통합시험을 진행하는 전력계 전기지상지원장비 설계 시 전력 증가에 따라 많은 고려사항이 필요로 한다. 본 논문은 탑재체에 따른 위성 전력요구도의 변화 및 전력요구도 증가에 따른 전력계 전기지상지원장비 설계 시 고려할 사항에 대해서 다룬다.

• 전력전자학회논문지
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• 제5권6호
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• pp.537-543
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• 2000

표준 배터리 모듈 시스템을 위한 새로운 배터라 충.방전기를 제안한다. 전체 시스템의 크기를 줄이기 위해 충전기와 방전기의 회로가 하나의 컨버터로 구현되었으며, 최대 전력 추적을 포함한 태양전지 출략전압 제어와 태양 전지 출력과 부하 전력에 따른 배터리 충.방전 전류 제어를 동시에 수행한다. 또한, 제안된 컨버터는 부하의 전략 공급을 간단히 할 수 있는 일성 전압 버스(regulated bus)를 제공한다. 제안된 컨버터는 특성상 DCM으로 동작하므로 전듀의 첨두지가 크므로 고전력 시스템에서는 여러 개의 모듈로 사용되어야 한다.

• 전자공학회논문지B
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• 제33B권3호
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• pp.193-201
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• 1996

The space power system for communication satellite which employs the direct energy transfer (DET) method consists of solar array, battry, shunt regulator, charger/discharger and power control unit (PCU). In this paper, the development of the DET power system charger/discharger unit and a microprocessor based PCU is developed for simplicity and flexiblity in the modificatin of control algorithm. A 28V bus voltage, 400W power rting power simulator is built and tested to verify the operation of the simulator at each mode and the stability of mode transition is analyzed.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 추계학술대회 초록집
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• pp.63.1-63.1
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• 2010

Since the solar energy resource is the main input for sizing any solar photovoltaic system and solar thermal power system, it is essential to utilize the solar radiation data as a application and development of solar energy system increase. It will be necessary to understand and evaluate the insolation data. The Korea Institute of Energy Research(KIER) has begun collecting horizontal global insolation data since May, 1982 at 16 different locations in Korea and for the more detailed analysis, Images taken by geostationary satellite may be used to estimate solar irradiance fluxes at earth's surface. It is based on the empirical correlation between a satellite derived cloud index and the irradiance at the ground. From the results, the measured data has been collected at 16 different stations and estimated using satellite at 23 different stations over the South Korea from 1982 to 2009. The Result of analysis shows that the annual-average daily global radiation on the horizontal surface is $3.56kWh/m^2/day$.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 B
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• pp.1438-1440
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• 2005

A power control and distribution unit(PCDU) plays roles of protection of battery against overcharge by active control of solar array generated power, distribution of unregulated electrical power via controlled outlets to bus and instrument units, distribution of regulated electrical power to selected bus and instrument units, and provision of status monitoring and telecommand interface allowing the system and ground operate the power system, evaluate its performance and initiate appropriate countermeasures in case of abnormal conditions. In this work, we perform the preliminary design of a PCDU scheme for the small LEO Satellite applications. The main constitutes of the PCDU are the battery interface module, the auxiliary supply modules, solar array regulators with maximum power point tracking(MPPT) technology, heater power distribution modules, internal converter modules for regulated bus voltage generation. and instrument power distribution modules.