• Title/Summary/Keyword: Analog MPPT

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Analog Control Algorithm for Maximum Power Trackers Employed in Photovoltaic Applications

  • Ji, Sang-Keun;Jang, Du-Hee;Hong, Sung-Soo
    • Journal of Power Electronics
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    • v.12 no.3
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    • pp.503-508
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    • 2012
  • Tracking the Maximum Power Point (MPP) of a photovoltaic (PV) array is usually an essential part of a PV system. The problem addressed by Maximum Power Point Tracking (MPPT) techniques is to find the voltage $V_{MPP}$ or current $I_{MPP}$ at which a PV array should operate to generate the maximum power output $P_{MPP}$ under a given temperature and irradiance. MPPT control methods such as the perturb and observe method and the incremental conductance method require a microprocessor or DSP to determine if the duty cycle should be increased or not. This paper proposes a simple and fast analog MPPT method. The proposed control scheme tracks the MPP very quickly and its hardware implementation is simple when compared with the conventional techniques. The new algorithm can successfully track the MPP even in the case of rapidly changing atmospheric conditions. In addition, it has higher efficiency than ordinary algorithms.

The analog MPPT for the solar array of KOMPSAT (다목적 실용위성의 태양 전지를 위한 아날로그 MPPT)

  • Park Hee-Sung;Jang Sung-Soo;Park Sung-Woo;Jang Jin-Baek;Lee Jong-In
    • Proceedings of the KIPE Conference
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    • 2004.07a
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    • pp.105-108
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    • 2004
  • In this paper, the simple analog MPPT (Maximum Power Point Tracking) algorithm is proposed for the solar array of KOMPSAT (Korea Multi-Purpose Satellite). This method doesn't need any calculation of power by multiplication of voltage and current and a measurement of the solar array temperature. It is consist of only two sample and hold circuits, two comparators, a flip-flop, and an integrator. The proposed MPPT algorithm is verified by the simulation for the 100[W] solar array.

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Analog MPPT for grid connected single-phase system (계통 연계 단상 시스템을 위한 아날로그 MPPT)

  • Ahn J.Y.;Park J.H.;Cho B.H.;Yoo G.J.
    • Proceedings of the KIPE Conference
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    • 2003.07b
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    • pp.785-788
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    • 2003
  • In this paper , the simple MPPT(Maximum Power Point Tracking) control algorithm is proposed for the grid-connected photovoltaic power system. This method uses the difference in the slope of the solar array voltage range below the MPP and above the MPP. This simple the algorithm enables the hardware implementation achieved by only analog devices. The proposed MPPT algorithm is verified by the hardware experiment using 500[W] solar away simulator, simplified inverter model hardware set, and rectified grid-line.

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Analog MPPT Tracking MPP within One Switching Cycle for Photovoltaic Applications (One Switching Cycle 내에 최대전력점을 추종하는 태양광 발전의 아날로 MPPT 제어 시스템)

  • Ji, Sang-Keun;Kwon, Doo-Il;Yoo, Cheol-Hee;Han, Sang-Kyoo;Roh, Chung-Wook;Lee, Hyo-Bum;Hong, Sung-Soo
    • The Transactions of the Korean Institute of Power Electronics
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    • v.14 no.2
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    • pp.89-95
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    • 2009
  • Tracking the Maximum Power Point(MPP) of a photovoltaic(PV) array is usually an essential part of a PV system. The problem considered by MPPT techniques is to find the voltage $V_{MPP}$ or current $I_{MPP}$ at which a PV array should operate to generate the maximum power output PMPP under a given temperature and irradiance. The MPPT control methods, such as the perturb and observe method and the incremental conductance method require microprocessor or DSP to determine if the duty cycle should be increased or not. This paper proposes a simple and fast analog MPPT method. The proposed control scheme will track the MPP very fast and its hardware implementation is so simple, compared with the conventional techniques. The new algorithm has successfully tracked the MPP, even in case of rapidly changing atmospheric conditions, and Has higher efficiency than ordinary algorithms.

Analysis of analog MPPT Algorithms for Low cost Photovoltaic System (저가형 태양광 발전시스템을 위한 아날로그 MPPT 알고리즘의 특성 해석)

  • Kim Han-Goo;Lee Sang-Yong;Choi Moon-Gyu;Kim Hong-Sung;Choe Gyu-Ha
    • Proceedings of the KIPE Conference
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    • 2004.07a
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    • pp.121-124
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    • 2004
  • In this paper, Simple and inexpensive analog maximum power point tracker (MPPT) algorithm for photovoltaic power system and low power system of doesn't use digital signal processor (DSP). The control circuit is composed such that the actual current and voltage are sensed directly from the PV array. These two signals are then multiplied by a single-chip multiplier. The multiplier output go through different time constants genesis pulse width modulated to switch. Finally those were verified through simulation.

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The Design of the analog MPPT by the control of the operating point of a solar array voltage and current (태양 전지의 전압, 전류 동작점 제어를 이용한 아날로그 MPPT 설계)

  • Park, Hee-Sung;Park, Sung-Woo;Jang, Jin-Beak;Jang, Sung-Soo
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2004.11a
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    • pp.255-258
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    • 2004
  • The SAR(Solar Array Regulator) of KOMPSAT(Korea Multi Purpose SATellite)-1, 2 regulates a photovoltaic power according to the duty ratio commands of the ECU. But the ECU has so many other jobs that it can not calculate the solar array condition immediately. It means the SAR cannot always generate the maximum power of a photovoltaic. Nowadays, the commercial photovoltaic systems are using a controller operated by digital processing. But the usage for satellite is not adaptable. It is not easy to find the processor of the space grade and the price is expensive. So in this paper, the simple analog MPPT(Maximum Power Point Tracking) algorithm is proposed for the small satellite in LEO. This algorithm does not need any calculation of power by multiplication of voltage and current md a measurement of the solar array temperature. It is consist of only two sample and hold circuits, two comparators, a flip-flop, and an integrator. The proposed MPPT algorithm is verified by the simulation and experimental.

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Real-Time Maximum Power Point Tracking Method Based on Three Points Approximation by Digital Controller for PV System

  • Kim, Seung-Tak;Bang, Tae-Ho;Lee, Seong-Chan;Park, Jung-Wook
    • Journal of Electrical Engineering and Technology
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    • v.9 no.5
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    • pp.1447-1453
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    • 2014
  • This paper proposes the new method based on the availability of three points measurement and convexity of photovoltaic (PV) curve characteristic at the maximum power point (MPP). In general, the MPP tracking (MPPT) function is the important part of all PV systems due to their power-voltage (P-V) characteristics related with weather conditions. Then, the analog-to-digital converter (ADC) and low pass filter (LPF) are required to measure the voltage and current for MPPT by the digital controller, which is used to implement the PV power conditioning system (PCS). The measurement and quantization error due to rounding or truncation in ADC and the delay of LPF might degrade the reliability of MPPT. To overcome this limitation, the proposed method is proposed while improving the performances in both steady-state and dynamic responses based on the detailed investigation of its properties for availability and convexity. The performances of proposed method are evaluated with the several case studies by the PSCAD/EMTDC$^{(R)}$ simulation. Then, the experimental results are given to verify its feasibility in real-time.

Unbounded Binary Search Method for Fast-tracking Maximum Power Point of Photovoltaic Modules

  • Hong, Yohan;Kim, Yong Sin;Baek, Kwang-Hyun
    • IEIE Transactions on Smart Processing and Computing
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    • v.5 no.6
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    • pp.454-461
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    • 2016
  • A maximum power point tracking (MPPT) system with fast-tracked time and high power efficiency is presented in this paper. The proposed MPPT system uses an unbounded binary search (UBS) algorithm that continuously tracks the maximum power point (MPP) with a binary system to follow the MPP under rapid-weather-change conditions. The proposed algorithm can decide the correct direction of the MPPT system while comparing the previous power point with the present power point. And then, by fixing the MPP until finding the next MPP, there is no oscillation of voltage MPP, which maximizes the overall power efficiency of the photovoltaic module. With these advantages, this proposed UBS is able to detect the MPP more effectively. This MPPT system is based on a boost converter with a micro-control unit to control analog-to-digital converters and pulse width modulation. Analysis of this work and experimental results show that the proposed UBS MPPT provides fast, accurate tracking with no oscillation in situations where weather rapidly changes and shadow is caused by all sorts of things. The tracking time is reduced by 87.3% and 66.1% under dynamic-state and steady-state operation, respectively, as compared with the conventional 7-bit perturb and observe technique.

태양전지 배열기의 최대 전력 추적 알고리즘 개발

  • Park, Hee-Sung;Jang, Sung-Soo;Jang, Jin-Baek;Park, Sung-Woo;Lee, Jong-In
    • Aerospace Engineering and Technology
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    • v.4 no.1
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    • pp.77-85
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    • 2005
  • MPPT(Maximum power point tracking) is used in photovoltaic systems to maximize the solar array output power, irrespective of the temperature and irradiation conditions and of the load electrical characteristics. In this paper, new MPPT algorithm is proposed for the small satellite in LEO. As the proposed MPPT algorithm does not need any calculation of power by multiplication of voltage and current, it can be made by the simply analog circuit. In this study, the proposed MPPT algorithm is verified by the simulation and experimental in the many conditions that can change the characteristics of the solar array.

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Buck-Boost DC to DC Converter for Thermoelectric Generator with Constant Output Voltage (열전 모듈의 정전압 출력 시스템을 위한 벅-부스트 DC-DC 변환기)

  • Cho, Sung-Kyu;Park, Soon-Seo;Kim, Ji-Gon;Nam, Ki-Hun;Kim, Shi-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.10
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    • pp.1845-1849
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    • 2010
  • We have proposed and fabricated a Buck-Boost DC to DC Converter for Thermoelectric generator (TEG) with constant output voltage suitable for battery chargers or constant voltage supplies in the range of several watt. The experimental and simulation results have shown that the proposed method allows stable operation with maximum 86% power transfer efficiency. The proposed circuit has a merit in cost and miniaturization of a system compared to conventional MPPT algorithms, because the proposed method adopts only analog circuit without DSP or micro controller unit for calculating peak power point by iterative methods.