A Hybrid Maximum Power Point Search Method Using Temperature Measurements in Partial Shading Conditions

Mroczka, Janusz; Ostrowski, Mariusz

doi:10.2478/mms-2014-0056

Cited by 23 publications

(4 citation statements)

References 23 publications

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“…The apparent position of the Sun on the celestial sphere is determined by the tracking system controller using the differential, algebraic, hybrid and MPP (Maximum Power Point) methods [2,14,20]. The differential method uses data from photodetectors to determine the apparent position of the Sun on the celestial sphere.…”

Section: Types Of Algorithmsmentioning

confidence: 99%

Energy Efficiency of Photovoltaic Panels Depending on the Step Resolution of Tracking System

Płachta

2024

IAPGOS

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The article presents an energy analysis of a 3.5 kWp photovoltaic installation placed on a two-axis tracking system, depending on resolution of step tracking system, that tracks apparent position of the Sun on the celestial sphere. Measurements were taken during July and August, months with similar solar radiation intensity. During the first month, the tracking system changed the spatial orientation of the photovoltaic panels with a frequency of 20 minutes, while in the second month the resolution of the tracking step was 120 minutes. The total energy production by the photovoltaic installation cooperating with the tracking system was 589.5 kWh and 579.85 kWh, for a tracking step resolution of 20 and 120 minutes, respectively. The monthly difference between the two analysed periods does not exceed 1.7%. However, when analysing the days with the highest energy production – exceeding 28 kWh/day, the photovoltaic installation which changed its spatial orientation with greater frequency produced 309.83 kWh, and with a smaller one 259.88 kWh. In the case of sunny, cloudless days, the difference in the efficiency of both solutions is equal to 19%. During days with lower solar radiation, the efficiency of the photovoltaic installations was similar. It can be concluded that increasing the step resolution of the tracking system increases energy production on sunny, cloudless days. It should be taken into account that increasing the frequency of changing the position of photovoltaic panels increased energy consumption by tracker motors from 2.48 kWh to 3.75 kWh, which constitutes 13.2% of the energy gain obtained over the entire tested period, but less than 1% during days with the highest amount of solar radiation.

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Section: Types Of Algorithmsmentioning

confidence: 99%

Energy Efficiency of Photovoltaic Panels Depending on the Step Resolution of Tracking System

Płachta

2024

IAPGOS

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“…The method uses temperature measurement to determine the open circuit voltage, and on this basis determines the starting point of the perturb and observe algorithm [13,16]. A disadvantage of this method is the large inertia of the temperature measurement of the photovoltaic panel, whereby the calculated voltage value coses the initial tracking error of perturb and the observe algorithm.…”

Section: Introductionmentioning

confidence: 99%

Photovoltaic maximum power point search method using a light sensor

Ostrowski

2015

SPIE Proceedings

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Oj Increasing E in 15 Voltage [V] io 15 Voltage IV] ao 56 '23 ABSTRACTThe main disadvantage of PV panels is their low efficiency and non-linear current-voltage characteristic. Both of the above depend on the insolation and the temperature. That is why, it is necessary to use the maximum power point search systems. Commonly used solutions vary not only in complexity and accuracy but also in the speed of searching the maximum power point. Usually, the measurement of current and voltage is used to determine the maximum power point. The most common in literature are the perturb and observe and incremental conductance methods. The disadvantage of these solutions is the need to search across the whole current-voltage curve, which results in a significant power loss. In order to prevent it, the techniques mentioned above are combined with other methods. This procedure determines the starting point of one of the above methods and results in shortening the search time. Modern solutions use the temperature measurement to determine the open circuit voltage. The simulations show that the voltage in the maximum power point depends mainly on the temperature of the photovoltaic panel, and the current depends mainly on the lighting conditions. The proposed method uses the measurement of illuminance and calculates the current at the maximum power point, which is used as a reference signal in power conversion system. Due to the non-linearity of the light sensor and of the photovoltaic panel, the relation between them cannot be determined directly. Therefore, the proposed method use the modified correlation function to calculate current corresponding to the light.

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“…A fair amount of papers focuses on photovoltaic (PV) panels as one of the green energy sources that do not cause any pollution, do not generate any noise, and that can be utilized for energy harvesting on a small scale -such as powering small devices using solar cells operating at the waste light [1]. A lot of research on PV panels concerns their electrical characteristics as well as maximum power point tracking algorithms [2][3][4][5][6][7][8]. However, many research papers that propose new algorithms include simulations only, which is helpful with getting quick results, but if a new idea is put forward, at some point it should be verified by physical model and measurements.…”

Section: Introductionmentioning

confidence: 99%

Design and evaluation of a low-cost solar simulator and measurement system for low-power photovoltaic panels

Walczak,

Bychto,

Kraśniewski

et al. 2022

Metrology and Measurement Systems

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Research related to photovoltaic panels comprises different topics starting with modelling solar cells, finding new maximum power point tracking (MPPT) algorithms, testing existing ones or designing of DC/DC converters for MPPT systems and microgrids that incorporate photovoltaic energy sources. In each of the examples above a deep knowledge of photovoltaic panels is required, as well as a reliable measurement system that can deliver continuous, stable light with enough power to meet standard test conditions (STC) and that can ensure repeatable results. Therefore this paper presents a low-cost solar simulator with a microcontroller-based measurement system, that can be used for various measurements of low-power photovoltaic panels.

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A Hybrid Maximum Power Point Search Method Using Temperature Measurements in Partial Shading Conditions

Cited by 23 publications

References 23 publications

Energy Efficiency of Photovoltaic Panels Depending on the Step Resolution of Tracking System

Energy Efficiency of Photovoltaic Panels Depending on the Step Resolution of Tracking System

Photovoltaic maximum power point search method using a light sensor

Design and evaluation of a low-cost solar simulator and measurement system for low-power photovoltaic panels

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