• 한국신재생에너지학회:학술대회논문집
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• 2005.06a
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• pp.217-217
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• 2005

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1330-1331
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• 2011

The on-grid distributed power system operated antiislanding due to the momently voltage sag of the power system, fault and etc. According to the 'Dispersed Generations in Distribution Systems Connection Technology Standard', the utilizable time ratio of PCS is low because of being put into in the steady state of the power system after 5 minutes. In this paper, the output characteristic is optimized with the hybrid system consisting of the wind system and PV system. And energy of hybrid system is supplied to the power system. Also, DVR function was applied to PCS to compensate the voltage sag frequently happening for a power system. The control performance of the proposed hybrid PCS is analyzed and simulated using PSIM to validate the system performace.

• Solar Energy
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• v.17 no.2
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• pp.43-53
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• 1997

Characteristics and properties of batteries applicable to the photovoltaic system are described in this paper. The use of a number of different types of batteries and designs depends on the many and varied requirements for battery power and the different environmental and electrical conditions under which they must operate. Most of the batteries used in PV systems are lead/acid batteries, though nickel/cadmium batteries are used for small applications in locations with extreme climates or where high reliability is essential such as spacecraft. The vanadium redox battery has been acknowledged as a promising energy storage system for a wide range of applications.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.684-685
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• 2011

종래의 배전계통에 있어서의 전력조류는 변전소에서 선로 말단을 향한 단방향이었지만, 태양광전원이 연계된 경우에는 그 출력용량의 여부에 따라 양방향의 전력조류가 발생할 가능성이 있어, 계통운용상 여러 가지의 문제점이 야기될 수 있다. 따라서 본 논문에서는 태양광 전원 연계에 따른 정상상태 시와 각종 전력품질에 대한 문제점을 상세히 분석하기 위하여, 실계통의 특성을 모의한 태양광전원 평가 시뮬레이터를 제작하였다. 그리고 이 장치를 이용하여 역률, 선로길이, 태양광발 전량의 변동에 따른 계통의 다양한 운용특성시험을 수행하여 제안한 평가 시뮬레이터의 유용성을 확인하였다.

• Journal of Power Electronics
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• v.10 no.5
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• pp.528-537
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• 2010

A novel decision reference based method for the maximum power point tracking (MPPT) of PV arrays is presented in this paper. The proposed decision reference was derived from a simplified solar cell model. This method solves the problems of conventional MPPT algorithms, such as oscillation of the operating point at the steady state and confusion under rapidly changing insolation. It is shown by simulation and experimental results that the method properly tracks a rapidly changing insolation profile. The signal to noise ratio (SNR) of the new decision reference is also higher than those of conventional P&O and INC methods. An updating subroutine was included in the proposed MPPT algorithm to compensate for temperature and aging effects.

• Proceedings of the KIPE Conference
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• 2011.07a
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• pp.87-88
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• 2011

본 논문은 최근 빠른 속도로 성장하고 있는 신재생에너지 분야 중 태양광을 이용한 계통연계형 PV PCS의 PLL(Phase Locked Loop) 기법을 DSP로 처리할 수 있도록 디지털 논리회로로 구현하는 DPLL(Digital Phase Locked Loop) 기법을 제시하고 모델링과 시뮬레이션을 통하여 검증한다.

• Proceedings of the KAIS Fall Conference
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• 2010.11a
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• pp.102-106
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• 2010

본 논문에서는 배전계통 모의장치와 태양광전원 모의장치, LabVIEW를 이용한 감시제어장치로 구성된 태양광전원 계통연계 시험장치를 제작하여, 태양광전원의 연계용량과 계통의 선로 구성특성, 역율(역율1, 지상/진상역율)의 3가지 Parameter에 대한 태양광전원의 정상상태 운용특성을 모의하였다. 즉, 태양광전원의 연계 운용이 배전계통(수용가)에 미치는 영향과 배전계통이 태양광전원에 미치는 영향을 분석하여, 태양광전원의 계통연계 운용 시에 발생 가능한 기술적인 사항을 검토하였다.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.62 no.5
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• pp.596-603
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• 2013

The increase of distributed power generation is closely related to interest in microgird including renuable energy sources such as photovoltaic (PV) systems and fuel cell. By the growing interest of microgrid all over the world, many studies on microgrid operation are being carried out. Especially operation technique which is core technology of microgrid is to supply heat and electricity energy simultaneously. Optimal microgrid scheduling can be established by considering CHP (Combined Heat and Power) generation because it produce both heat and electricity energy and its total efficiency is high. For this reason, CHP generation in microgrid is being spotlighted. In the near future, wide application of microgrid is also anticipated. This paper proposes a mathematical model for optimal operation of microgrid considering both heat and power. To validate the proposed model, the case study is performed and its results are analyzed.

• Proceedings of the KIEE Conference
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• 2001.07b
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• pp.1281-1283
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• 2001

An investigation into power conditioners that interface with photovoltaic array and utilities has been completed. The rating for this investigation is residential system(3-5kW) that interface with a 220V single phase utility connection. As the result of this investigation, a 3kW high frequency PWM IGBT inverter feeding a high frequency isolation transformer with a sinusoidal current wave was selected. The output of the transformer rectified with a diode bridge rectifier four IGBT, used as 60Hz switched, reverse the polarity of the rectified current on every other half cycle of the utility voltage. Even though the high frequency link system used more power semiconductors a net size, weight, and parts cost saying result compared to the other systems due to elimination of 60Hz transformer.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.27 no.1
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• pp.1-7
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• 2014

The current downturn of BIPV sector has an enormous potential to rebound and expand into the PV sector for construction market in the foreseeable future. Solar technology has already gained a significant market due to lack of natural resources in the Korean domestic market. Given the technical infrastructure of state-of-the-art fusion technology, the competitiveness of software-driven BIPV market in the world can be ver attractive and have the potential to develop as a key national technology. To do this, from the viewpoint of complexity, technical R&D, national political aspect, social aspect, economic aspect and institutional support systems need to be parallelly formulated. A dedicated BIPV sector has not yet been established, especially policy and institutional framework have very crucial impact on the establishment of BIPV sector.