• 조명전기설비학회논문지
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• 제28권12호
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• pp.18-29
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• 2014

This paper proposes the integration of photovoltaic (PV) and energy storage systems for sustained power generation. In this proposed system, whenever the PV system cannot completely meet load demands, the super capacitor provides power to meet the remaining load. A power management strategy is designed for the proposed system to manage power flows between PV array systems and supercapacitors (SC). The main task of this study was to design PV systems with storage strategies including MPPT with direct control and an advanced DC-link controller and to analyze dynamic model proposed for a PV-SC hybrid power generation system. In this paper, the simulation models for the hybrid energy system are developed using Matlab/Simulink, SimPowerSystems and Matlab/Stateflow tool. This is the key innovative contribution of the research paper. The system performances are verified by carrying out simulation studies using practical load demand profile and real weather data.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.1102_1103
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• 2009

본 논문은 에너지 고갈로 인해 신재생에너지가 대두되는 가운데 독립형 태양광 발전시스템의 PV_Array 선정에 대한 논문이다. 독립형 태양광 발전 시스템만을 이용한 PV_Array 출력을 조정해서 부하에 안정적으로 공급하게 설계하였다. 본 논문에서는 PV_Array 내부 모듈의 개수와 인버터 변환 효율을 조정하였다.

• 태양에너지
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• 제19권4호
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• pp.63-69
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• 1999

The conventional grid connected PV(Photovoltaic) system has a unstable output pattern due to its dependence on the weather condition, although solar-cell array averagely has a regular output characteristics to have a peak output nearly at noon. Therefore assuming the high density grid connection in the future, this unstable output pattern can be one of the main reasons to generate power disturbance such as voltage variation, frequency variation and harmonic voltage generation in low voltage distribution line. However general grid connected solar-cell system do not have functions to cope with these disturbances. Therefore this study proposed a advanced type grid connected PV system with functions to suppress output power fluctuation due to solar-cell array output variation and showed the levelling effect of fluctuation due to instantaneous array output variation.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1996년도 창립기념 전력전자학술발표회 논문집
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• pp.103-108
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• 1996

In this paper, a novel utility connected photovoltaic power generation system with unity power factor and uninterruptable power system facility and its control strategy are proposed. The proposed photovoltaic(PV) system is connected in parallel between utility and load. The PV system provides an uninterruptable voltage to load, a maximum power tracking to solar array, and power factor correction to the utility. The proposed system has the following advantages compared with the conventional utility connected PV system. 1. Harmonic elimination Function 2. Feeding the photovoltaic energy to the utility 3. Providing the uninterruptible power source along battery to the load In case that the photovoltaic array system is on the poor power generation, the battery and capacitor of the PV system are charged by three phase utility source and the inverter in the PV system only provides the reactive current to eliminate the harmonic current exited on the utility. In the normal operation mode, the PV system supplies active power to load and reactive power to utility in order to maintain the unity power factor and to regulate ac load voltage.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.1118_1119
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• 2009

The power generated by a Photovoltaic(PV) cell depends on the operating voltage of the array, its voltage-current and voltage-power characteristic curves specify a unique operating point at which maximum possible power is delivered and the array is operated at its highest efficiency. PSCAD/EMTDC, which is a simulation tool for the transient analysis of an electric power system, was used to simulate the PV Cell system. So, in this paper, the PV cell components of the PSCAD/EMTDC were developed, and the Maximum Power Point Tracking(MPPT) modeling was used for the developed PV power system to find the maximum power.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.492_493
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• 2009

In this paper, we analyzed relation between weather distribution and output of PV module. Equivalent circuit of PV module was derived. Output of PV array was calculated considering temperature and insolation as input. Output of PV array installed on the roof top was also measured. Then, comparison between results was carried out to verify that relation between input and output is appropriate. Distribution of insolation and temperature was derived from KMA (Korea Meteorological Administration). Distribution of PV output was deduced, by considering weather distribution. The result of this paper can be used in economic analysis and reliability calculation.

• 전기학회논문지
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• 제64권7호
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• pp.1012-1018
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• 2015

The studies on the operating performance analysis or design about the fixed tilt angle flat-plate photovoltaic (PV) system are still lively going off. However the operating property analysis about the arch type PV system which means PV array were designed as round type is dissatisfied. In this paper, we theoretically established the factors which are cause of the deterioration in performance of arch type PV system. In addition, we use the Solar Pro simulation tools to design both flat-plate type and arch type 30kW PV systems. The simulations about arch type PV system applied two ways such as central inverter and string inverter were conducted. The performance ratio (PR) of the PV system with flat-plate type shows the highest value 74[%] when the tilt angle is 30°. In case of arch type, when applying central inverter method, PR value shows approximately 73[%] and no more difference with arch type of the PV array. This value shows 1[%] decrease compare with the flat-plate type. However when applying string inverter methods, the average PR value shows 80 % and 6% improved than the central inverter method.

• 한국산학기술학회논문지
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• 제17권5호
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• pp.723-730
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• 2016

태양광 모듈은 필요한 발전량을 얻기 위해 태양 전지를 직렬과 병렬로 조합하여 구성하며, 이 모듈은 일사량 및 온도에 따라 발전성능이 크게 좌우되는 특성을 가지고 있다. 또한, 태양광 전원은 건물 또는 나무 등의 주변 환경에 의한 음영과 같은 특수한 상황에 의하여 출력손실이 발생하게 된다. 즉 태양광 전원을 구성하는 태양광 모듈 일부에 부분음영이 발생할 경우, 태양광 모듈의 단락전류가 제한되어 전체 발전량 손실을 초래하고, 열점(Hot-Spot) 현상과 같은 열화현상이 발생하여 모듈의 수명을 단축시킨다. 따라서 본 논문에서는 태양광 모듈의 출력을 향상시키기 위한 태양전지와 바이패스 다이오드의 최적구성 알고리즘을 제시하였다. 또한, 부분 음영에 의한 출력손실을 최소화하기 위하여 태양광 어레이의 회로를 최적으로 구성하는 알고리즘을 제시하였다. 상기 알고리즘을 바탕으로 회로해석 프로그램인 PSIM S/W를 이용하여 태양광 모듈과 태양광 어레이를 모델링하여 시뮬레이션을 수행하였다. 그 결과, 본 논문에서 제안한 태양 전지와 바이패스 다이오드의 최적구성 알고리즘과 태양광 어레이의 최적구성 알고리즘이 태양광 전원의 성능 향상에 유용함을 확인하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 B
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• pp.1157-1158
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• 2006

The key of this study is the technical development to maximize electric energy production through PV generation system. Under a conventional MPPT control method, both input voltage and input current coming out from PV array had to be feed backed. Then, the system has complex structure and may fail to track Maximum Power Point of PV array when weather conditions changed urgently. A PV output senseless MPPT control for PV generation system is possible to solve the mentioned above. The best advantage is that the current flowing into load is the only one considerable factor. In case of a huge photovoltaic generation system, it can be operated much more safely than a conventional system. In this paper, a novel PV output senseless MPPT control for the PV generation system was proposed and applied to the manufactured system and the experimental results were shown. Authors are sure that it is the most useful method to maximize power from photovoltaic system with only a feedback of load current.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제11B권4호
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• pp.169-174
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• 2001

A novel simulation scheme of transient phenomenon for the photovoltaic (PV) generation system under the real weather conditions has been proposed in this paper. A grid connected PV array is simulated using PSCAD/EMTDC. The transient changes of the output current of PV array under the real weather conditions is described and the output current of DC/AC converter flowing through the utility power network is also analyzed with the PWM switching width. Moreover, the MPPT control of PV generation system is combined to the system during the simulation for the comparison purposes of the control schemes. The outcome of the simulation demonstrates the effectiveness of the proposed simulation scheme. The result shows that the cost effective verifying for the efficiency or availability and stability of PV generation systems and the comparison research of various control schemes like MPPT under the same real whether conditions are eventually possible.