• Title/Summary/Keyword: maximum power point tracking(MPPT)

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A Design of the Solar Tracker for LED Streetlight in Using Solar Cell (태양전지를 이용한 LED 가로등의 태양광 추적 장치 설계)

  • Lee, Ok-Jae
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.12
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    • pp.1-9
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    • 2013
  • A standalone LED lighting system in using solar energy has been used usually less than 70W of lighting power because of a troublesome installation and maintenance. In this system, as more and more LED lighting power increases, the capacity of photovoltaic panel does proportionally, and to improve the charging efficiency of solar energy, MPPT(Maximum Power Point Tracking) techniques is used frequently, but the solar tracker is not. In this paper, a solar tracker which traces the light of the sun in varying hour to hour is studied to apply to the standalone LED lighting system. This solar tracker consists of twin axis for tracing the azimuth and altitude respectively, and it has a robust structure with safe mode to stand a strong wind. As a result of analysis, generating efficiency of the traced type has improved on the fixed one 28.84% on average.

A Wind Turbine Simulator with Variable Torque Input (풍력 터빈 모의 실험을 위한 가변 토오크 입력형 시뮬레이터)

  • Jeong, Byeong-Chang;Song, Seung-Ho;No, Do-Hwan;Kim, Dong-Yong
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.51 no.8
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    • pp.467-474
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    • 2002
  • In this paper, a wind power simulator is designed and implemented. To realize the torque of wind blade, a DC motor is used as a variable torque input device. An induction machine is used as a generator of which speed is controlled to maintain the optimal tip speed ratio during wind speed change. Input torque of system is controlled by armature current of DC motor and speed is controlled by generator control unit using field oriented control algorithm. Various control algorithms such as MPPT, soft start up, the simulator reactive power control, can be developed and tested using the simulator.

Development of Adaptive MPPT Algorithm for Voltage Fluctuation Control in Microgrid (마이크로그리드에서 전압변동 제어를 위한 적응형 MPPT 알고리즘 개발)

  • Lee, Kyoung-Chan;Lee, Soon-Jeong;Oh, Yun-Sik;Seo, Hun-Chul;Kim, Chul-Hwan
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.47-48
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    • 2011
  • PV(Photovoltaic) cell의 출력 전력은 일사량이나 온도와 같은 외부환경의 영향을 받아 변화하게 되므로 PV cell은 전압과 전력의 출력에 있어 비선형적이다. 이와 같은 비선형적 관계로 인해 MPPT(Maximum Power Point Tracking)를 수행하는 것이 PV 시스템에서는 매우 중요하다. 본 논문에서는 PV의 전력-전압 출력 특성에서 MPP를 기준으로 양쪽 경사면의 기울기와 Section의 차이를 이용한 새로운 추종법을 제안하였다. P-V 특성 곡선에서 왼쪽 측면에 비해 오른쪽 측면이 큰 기울기를 갖는 동시에 좁은 Section을 가지므로 제안하는 알고리즘은 이러한 특성을 활용한다. 또한 EMTP를 이용하여 제안된 기법의 성능과 동작을 검증하였다.

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The MPPT Control Method of the Seaflow Generation by using the Fuzzy Controller (조류발전의 MPPT제어 비교)

  • Kim, Cheon-Kyu;Kang, Hyoung-Seok;Kim, Young-Jo;Kim, Young-Seok
    • Proceedings of the KIEE Conference
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    • 2008.10c
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    • pp.114-116
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    • 2008
  • 본 논문에서는 DC-DC 컨버터를 이용하여 조류 발전의 MPPT(Maximum Power Point Tracking) 제어를 제안하였다. 기존의 고정 듀티 제어를 이용한 발전 시스템과 가변 듀티를 이용한 발전시스템과의 비교를 통해서 가변듀티를 이용한 제어방법이 더욱 우수한 성능을 나타낸다는 것을 검증하였다. 제안한 시스템은 블레이드, 영구자석 동기전동기, 다이오드 정류기, DC-DC 컨버터로 구성되어 있으며, 고정듀티, 가변듀티 퍼지제어기를 이용한 가변듀티 방법을 이용하여 제어하였다. 본 시스템은 조류 속도의 측정 없이 컨버터의 듀티 가변으로 발전기가 최대 출력전력을 낼 수 있도록 제어하므로, 별도의 측정 장비가 필요 없다. 따라서 시스템 구성비용 적고, 복잡성이 낮으며, 효율이 높다. 알고리즘의 유효성은 Matlab Simulink를 통해서 검증하였다.

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Review of the maximum power point tracking algorithms under rapid irradiance variations for photovoltaic system (일사량 급변에 따른 태양광시스템의 MPPT 알고리즘 비교 분석)

  • Kim, Eui-Jong;Yu, Byung-Gyu;Jung, Young-Seok;So, Jung-Hun;Yu, Gwon-Jong;Cha, Han-Ju
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.1218-1219
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    • 2007
  • 본 논문에서는 기존의 MPPT 기법인 Perturbation-and-Observation(이하 P&O)와 modified incremental conductance(이하 modified InCond)에 대해 Matlab과 PSIM의 인터페이스를 통해 일사량 급변시의 동작을 살펴본다. 기존의 논문에서는 각각의 일사량에 대해 효율 면에서 P&O가 InCond에 비해 높지만 일사량 급변시 과도상태에서는 InCond가 더 효율적으로 발표되었다. 이를 검토해 보기 위해 우선 실제 시판되는 태양전지 모듈에 대해 Matlab을 이용한 모델링을 실시함으로써 보다 정확한 값을 얻는다. 다음으로 PSIM을 이용하여 전력변환부와 제어기를 모델링하고 Matlab의 Simulink를 통해 인터페이스를 실시한다. 마지막으로 일사량 급변 시 과도상태와 급변 후에 MPPT 동작을 살펴본다.

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A Study on the Controller Design of the Three-Level Boost Converter for Photovoltaic Power Conditioning System (태양광 발전 시스템용 3-레벨 부스트 컨버터 제어기 설계에 관한 연구)

  • Lee, Kyu-Min;Kim, Il-Song
    • The Transactions of the Korean Institute of Power Electronics
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    • v.26 no.3
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    • pp.227-236
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    • 2021
  • This research proposes a modeling and controller design of a three-level boost (TLB) converter for the implementation of maximum power point tracking (MPPT) in the photovoltaic power conditioning system (PCS). Contrary to the output voltage control of the conventional controller, the Photovoltaic PCS requires an input voltage controller for MPPT operation. A TLB converter has the advantage of decreasing the inductor size and increasing efficiency compared with the existing booster converter. However, an optimal controller is difficult to design due to the complexity of the TLB operations, which have two operational modes on the duty ratio boundary of 0.5. Therefore, the unified linear model equations of the TLB converters, which can be applicable to both operational modes, are derived using linearized solar cell expressions. Furthermore, the transfer functions are obtained for the controller design. The MPPT voltage controller is designed using MATLAB SISOTOOL. In addition, a controller for capacitor voltage unbalancing is described and designed. The simulations and experimental verifications are conducted to verify the effectiveness of the small-signal analysis and control system design.

A fully UHF-powered smart sensor tag in food freshness monitoring (음식물 신선도 모니터링을 위한 풀 패시브 UHF 스마트 센서 태그)

  • Lam, Binh Minh;Chung, Wan-Young
    • Journal of the Institute of Convergence Signal Processing
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    • v.19 no.3
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    • pp.89-96
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    • 2018
  • This study aims to develop a fully passive smart sensing tag utilizing RF (Radio Frequency) energy harvesting technology at UHF (Ultra High Frequency) band of 915MHz. To optimize the power collected under various radiated conditions, an efficient energy harvesting module exploiting a boost circuit with maximum power point tracking (MPPT) is employed. Specifically, the proposed tag features two orthogonal antennas to enhance its capability of both energy scavenging and data transmissions. The experimental result shows that the developed smart sensor tag can scavenge an RF input power of as low as 0.19mW at a distance of 4 meters for a 3.6Vdc output. Furthermore, the proposed smart sensor tag performs the feasibility of completely autonomous monitoring food freshness at 2 meters with a low-power sensor array.

Research on Variable Constant Current Efficiency Measuring Device for Solar Panel to Reuse (태양광 패널 재사용을 위한 가변 정전류 기반의 효율 측정장치에 관한 연구)

  • Sang-Jin Woo;Dae-Heon Kim;Jae-Jin Lee;Oh-Min Kwon
    • IEMEK Journal of Embedded Systems and Applications
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    • v.18 no.1
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    • pp.9-17
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    • 2023
  • This paper relates to the development of a device for measuring the efficiency of a solar panel based on a variable constant current, and proposed a standard for reuse of the solar panel. By applying a variable constant current circuit to a solar panel efficiency measuring device, it was easy to apply a maximum power point tracking (MPPT) algorithm. In addition, a load dispersion method was applied to measure the efficiency of a high-capacity solar panel. and it is possible to solve a problematic thermal runaway during a MOSFET parallel operation by applying the load dispersion method. As a result of the experiment, the solar panel efficiency measuring device was able to accommodate a large solar panel of 350W, which is the maximum measurement goal. In this paper, the validity was confirmed through the 310W solar panel efficiency measurement experiment collected after removal.

A Study on the Installation Angle of the Marine Solar Power Generation System (해상용 태양광 발전 시스템의 설치 각도에 관한 연구)

  • Oh, Jin-Seok;Jang, Jae-Hee
    • Journal of Navigation and Port Research
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    • v.42 no.3
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    • pp.167-176
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    • 2018
  • A solar power generation system on single point moored offshore plant has independent power system In order to satisfy the maritime environment and account for the number of sunless days, it is important to supply stable electric power to the systems. For these reasons, solar panels are installed in multiple directions. However, a partial shading effect occurs because the amount of light incident on each panel is different. The generated power by the solar generation system installed on land is affected by the latitude, then it is installed at an angle of 30 to $45^{\circ}$. in the case of Korea. In the case of a solar power generation system installed in a mooring type of marine plant, there is a possibility that the maximum power point is outside of the controllable range due to the partial shading effect. Therefore, a power generation loss occurs. By reducing the light amount difference between both panels, the maximum power point can exist in a range where the MPPT algorithm can track the power. The purpose is so the power generation efficiency can be further increased. In this paper, simulation results show that the highest power generation efficiency is obtained at an installation angle of $20^{\circ}$.

The PV MPPT & Charge and Discharge Algorithm for the Battery Included Solar Cell Applications (배터리 내장형 초소형 태양광 장치용 PV MPPT 및 충방전 제어 알고리즘)

  • Kim, Seung-Min;Park, Bong-Hee;Choi, Ju-Yeop;Choy, Ick;Lee, Sang-Chul;Lae, Dong-Ha
    • Journal of the Korean Solar Energy Society
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    • v.33 no.5
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    • pp.69-75
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    • 2013
  • To increase the efficiency of the photovoltaic, almost photovoltaic appliances are controlled by Maximum Power Point Tracking(MPPT). Existing most of the PV MPPT techniques have used power which multiplies sensed output current and voltage of the solar cell. However, these algorithms are unnecessarily complicated and too expensive for small and compact system. The other hand, the proposed MPPT technique is only one sensing of the MPPT converter's output current, so there is no need to insert another sensors of battery side. Therefore, this algorithm is simpler compared to the traditional approach and is suitable for low power solar system. Further, the novel proper charge/discharge algorithm for the battery with PV MPPT is developed. In this algorithm, there is CC battery charge mode and load discharge mode of the PV cell & battery dual. Also we design current control to regulate allowable current during the battery charging. The proposed algorithm will be applicable to battery included solar cell applications like solar lantern and solar remote control car. Finally, the proposed method has been verified with computer simulation.