• 제목/요약/키워드: PV Array

검색결과 236건 처리시간 0.029초

반고정식 PV 시스템의 운영 스케줄 도출 및 그에 따른 발전 효율 변화 고찰 (Optimal Operation Schedule of Semi-Fixed PV System and Its Effect on PV Power Generation Efficiency)

  • 곽인규;문선혜;허정호
    • 한국태양에너지학회 논문집
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    • 제37권6호
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    • pp.69-77
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    • 2017
  • The amount of solar irradiation obtained by a photovoltaic (PV) solar panel is the major factor determining the power generated by a PV system, and the array tilt angle is critical for maximizing panel radiation acquisition. There are three types of PV systems based on the manner of setting the array tilt angle: fixed, semi-fixed, and tracking systems. A fixed system cannot respond to seasonal solar altitude angle changes, and therefore cannot absorb the maximum available solar radiation. The tracking system continually adjusts the tilt angle to absorb the maximum available radiation, but requires additional cost for equipment, installation, operation, and maintenance. The semi-fixed system is only adjusted periodically (usually seasonally) to obtain more energy than a fixed system at an overall cost that is less than a tracking system. To maximize semi-fixed system efficiency, determining the optimal tilt angle adjustment schedule are required. In this research, we conducted a simulation to derive an optimal operation schedule for a semi-fixed system in Seoul, Korea (latitude $37.5^{\circ}$). We implemented a solar radiation acquisition model and PV genereation model on MATLAB. The optimal operation schedule was derived by changing the number of tilt angle adjustments throughout a year using a Dynamic Algorithm. The results show that adjusting the tilt angle 4 times a year was the most appropriate. and then, generation amount of PV system increased 2.80% compared with the fixed system. This corresponds to 99% compared to daily adjustment model. This increase would be quite valid as the PV system installation area increased.

그림자 영향을 고려한 새로운 태양광 추적시스템 제어 (Control of a Novel PV Tracking System Considering the Shadow Influence)

  • 박기태;최정식;정동화
    • 전기학회논문지
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    • 제57권6호
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    • pp.994-1002
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    • 2008
  • In this paper a novel tracking system is described, regarding the influence of shadow between array, aimed at improving the efficiency of PV tracking system. Comparing with a building site versus capacity power, domestic solar powers have a limited siting. Therefore, each array interferes with the shadow of other arrays. The loss by influence of those shadow can be compensated for by means of control algorithm of the tracking device. The paper suggests a method controlling an altitude for length which is received the shadow influence of PV array. By using an azimuth of current solar position and the length between arrays, the controller of tracking device is able to calculate the length between actual arrays and make a comparison of the shadow length at a specific time with the length between arrays. When the shadow length is longer than the length between arrays, the controller of tracking device can adjust a position by compensating error altitude of the length between arrays at an altitude of current solar position. In the paper, we develop the control algorithm able to minimize the loss caused by the influence of shadow on the PV tracking system, and compared this with conventional output system. The controller has been tested in the laboratory with proposed algorithm and shows excellent performance.

120 kW급 태양광 발전시스템 설치 및 실 계통연계 운전 결과 평가 (Test Results Grid Connection of 120 kW Power Generation System)

  • 황정희;안교상;임희천;김수창;김신섭
    • 한국수소및신에너지학회논문집
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    • 제17권3호
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    • pp.338-346
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    • 2006
  • In this paper, the test results of medium-size(120 kW class) PV system which was installed in the Taeahn thermal power station of Korea Western Power Co., Ltd., were summarized for developing the practical technology to applicate high voltage grid connection PV system. The 120 kW photovoltaic system which was consisted of 1,300 modules, PCS, and 150 kVA transformer station has been operated since Aug. 05, 2005. For verifying the modeling results of PV system, the operation data was compared with modeling results which was executed commercial PSCAD/EMTD and Psim tools. An equivalent circuit model of a solar cell has been also used for solar array modeling. A series of parameters required for array modeling have been estimated from general specification data of a solar module. A PWM voltage source inverter(VIS) and its current control scheme have been analyzed by using P&O (perturbation and Observation) MPPT algorithms technique.

태양전지모듈의 노화현상에 따른 전기적 특성 고찰 (Consideration of Electrical Properties in Field-aged Photovoltaic Module)

  • 강기환;유권종;안형근;한득영
    • 한국전기전자재료학회논문지
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    • 제17권12호
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    • pp.1289-1295
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    • 2004
  • In this paper, degradation in field-aged PV modules including degradation of interconnect, discoloration of encapsulant and hot spot have been observed and analyzed. From the results, photovoltaic module installed for 6 years shows around 16 % drop of electrical properties due to the interconnect degradation and PV module passed 18 years has been found to drop of around 20 % mainly by the encapsulant discoloration. Furthermore the difference between low and high temperature of PV array at hot spot goes up to 3$0^{\circ}C$ and it leads to interconnect degradation. On the other hands, the temperature difference was observed to be around 15$^{\circ}C$ at the encapsulant discoloration spot of PV array.

FNN에 의한 태양광 발전의 MPPT 제어 (MPPT Control of Photovoltaic by FNN)

  • 최정식;고재섭;정동화
    • 전기학회논문지
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    • 제58권10호
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    • pp.1968-1975
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    • 2009
  • The paper proposes a novel control algorithm for tracking maximum power of PV generation system.. The maximum power of PV array is determinated by a insolation and temperature. Prior considered the term in PV generation system is how maximum power point(MPP) is accurately tracked.. The paper proposes a fuzzy neural network(FNN) control algorithm so as to accurately track those maximum power points. The proposed control algorithm comprises the antecedence part of fuzzy rule and clustering method, multi-layer neural network in the consequent part. FNN has the advantages which are depicted both high performance and robustness in fuzzy control and high adaptive control in neural network.. Specially, it can show the outstanding control performance for parameter variations appling to non-linear character of PV array. In this paper, the tracking speed and the accuracy prove the validity through comparing a proposed algorithm with a conventional one.

Field aged 태양전지모듈의 노화현상에 따른 전기적 특성 관찰 (Observation of Electrical Properties in Field-aged Photovoltaic Module)

  • 강기환;유권종;안형근;한득영
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2004년도 하계학술대회 논문집 Vol.5 No.1
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    • pp.28-32
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    • 2004
  • In this paper, degradation in field-aged PV modules including degradation of interconnect, discoloration of encapsulant and hot spot have been observed and analyzed. From the results, photovoltaic module installed for 6 years shows around 16% drop of electrical properties due to the interconnect degradation and PV module passed 18 years has been found to drop of around 20% mainly by the encapsulant discoloration. Furthermore the difference between low and high temperature of PV array at hot spot goes up to $30^{\circ}C$ and it leads to interconnect degradation. On the other hands, the temperature difference was observed to be around $15^{\circ}C$ at the encapsulant discoloration spot of PV array.

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PV모듈의 바이패스 다이오드 단락 고장 시 태양광어레이 회로 특성분석 (Electric Circuit Analysis for PV Array on Short-Circuit Failure of Bypass Diode in PV Module)

  • 이충근;신우균;임종록;황혜미;주영철;정영석;강기환;장효식;고석환
    • 한국태양에너지학회 논문집
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    • 제39권6호
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    • pp.15-25
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    • 2019
  • As the installation of photovoltaic systems increases, fire accidents of PV system grow every year. Most of PV system fires have been reported to be caused by electrical components. The majority of fire accidents occurred in combiner box, which is presumed to be short-circuit accidents due to dustproof and waterproof failures or heat deterioration of blocking diode. For this reason, the blocking diode installation became optional by revised PV combiner regulation. In this paper, according to the revised regulation, reverse current that generated by voltage mismatch was measured and analyzed in PV array without a blocking diode. The factors that cause voltage mismatch in array are assumed to be shaded PV module and short circuit failure of bypass diode. As the result of experiment, there is no reverse current to flow under shading condition in module, but reverse current flows on the failure of bypass diode in module. According to the module's I-V characteristic curve analysis, open voltage was slightly reduced due to operation of bypass diode in shading. However, it showed that open circuit voltage has decreased significantly in the failure of bypass diode. This indicates that the difference in open voltage reduction of voltage mismatch factor causes reverse current to flow.

PV Output Sensorless(POS) MPPT법이 적용된 3상 계통연계형 태양광 발전시스템의 특성해석 (The characteristic analysis of POS (PV Output Sensorless) MPPT based 3 phase grid connected PV system)

  • 박상수;김경훈;김상용;장성재;서효룡;박민원;유인근
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2008년도 제39회 하계학술대회
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    • pp.1081-1082
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    • 2008
  • Photovoltaic (PV) power generation system has been widely studied as a clean and renewable power source. The purpose of this study is to keep the output power of photovoltaic cells maximum under any weather conditions. There are so many MPPT (Maximum Power Point Tracking) methods. P&O method has been used as a key MPPT method, both voltage and current coming out from PV array have to be feedback in the method. Thus, the system has a complex structure, and may fail to track MPP of PV array when unexpected weather conditions happen. In order to reduce the feedback components, POS MPPT control method was proposed by the authors. In this paper, the authors apply the POS MPPT control method to three phase PCS system. And the effectiveness of the proposed control scheme is demonstrated through PSCAD/EMTDC simulation.

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PV Output Senseless (POS) MPPT 제어법이 적용된 단상 PCS 개발 및 운전특성 분석 (The development and operation characteristics analysis of PCS applied PV Output Senseless (POS) MPPT)

  • 이석주;박해용;김경훈;서효룡;박민원;유인근
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2007년도 제38회 하계학술대회
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    • pp.226-227
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    • 2007
  • The purpose of this study for photovoltaic (PV) generation system is to keep the output power of photovoltaic cells maximized under any weather conditions. In a conventional MPPT (Maximum Power Point Tracking) control method, both voltage and current coming out from PV array have to be fedback. Thus, the system has a complex structure, and may fail to track MPP of PV array when unexpected weather conditions happen. This paper proposes a novel PV Output Senseless (POS) control method to solve the mentioned problem. The main advantage of this method is that the current flowing into load is the only one considerable factor. In case of a huge PV generation system, it can be operated much more safely than the conventional system. To verify this theory, results that compare and analyze the simulated data with experimental data under real weather condition of the manufactured PV generation system are shown in this paper. Authors vividly states that this theory uses constant resistors and variable resistors of DC-DC converter in PV system. Authors emphasize that it is a very useful method to maximize power from PV cells to load with only the feedback of load current. Authors also emphasize that this theory is applicable in case of the PCS in PV power generation system.

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BLDC 모터용 인버터를 이용한 PV 양수펌프의 MPPT 제어 (MPPT Control of PV Water Pumping Using BLDC Motor-Inverter)

  • 김성남;백승길;조정민;이승환;오봉환;이훈구;한경희
    • 전력전자학회논문지
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    • 제6권6호
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    • pp.498-505
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    • 2001
  • 본 논문은 PV어레이를 이용한 양수펌프 시스템의 전체적인 제어를 구상하는 제시하였으며, DC/DC 컨버터를 생략하기 위하여 BLDC 모터의 벡터제어를 이용하고 DC량과 AC량과 관계를 찾아내어 인버터만으로 PV 어레이의 최대출력점을 추적하였다. 기존의 최대출력점 제어기는 3상 인버터의 DC 링크단에 나타나는 전류리플로 인하여 제어기가 불안정하게 된다. 따라서 본 연구에서는 제어기의 불안정성을 보완하기 위해 BLDC 모터의 $i_qs$ 전류를 이용한 MPPT(Maximum Power Point Tacker) 제어 알고리즘을 구성하였다. 이러한 제어기의 우수함을 입증하기 위하여 J. A Domfnguez가 비동기모터에 적용한 제어방식을 BLDC 모터에 적용한 결과와 본 논문에서 제시한 제어방식을 시뮬레이션 및 실험을 통하여 비교 검토하고 하였다.

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