Monitoring and Suppression of the Typical Hot-Spot Phenomenon Resulting From Low-Resistance Defects in a PV String

Yang, Shuai; Itako, Kazutaka; Kudoh, Tomohiro; Koh, Keishin; Ge, Qiang

doi:10.1109/jphotov.2018.2861734

Cited by 17 publications

(14 citation statements)

References 21 publications

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“…To analyze the behavior of the hotspot, several electrical models have been proposed, as reviewed in the introduction-the interest and simple hotspot modeling circuit by Kazutaka et al [36]. The proposed work shows the model as the small resistance installed in a PV's single-diode equivalent circuit.…”

Section: Modeling Of Pv Panel In Hotspot Conditionmentioning

confidence: 99%

“…The paper demonstrates the small signal model, which detects the hotspot using the frequency measurement. Kazutaka et al [36] later presented a simpler model of the hotspot as one of low resistance installed in a circuit equivalent to a single diode. This resistance induces the PV's current to flow back to the PV cell, and causes a reduction of the output current.…”

Section: Introductionmentioning

confidence: 99%

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Global Maximum Power Point Tracking under Shading Condition and Hotspot Detection Algorithms for Photovoltaic Systems

Gosumbonggot

Fujita

2019

Energies

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Photovoltaic (PV) technology has been gaining an increasing amount of attention as a renewable energy source. Irradiation and temperature are the two main factors which impact on PV system performance. When partial shading from the surroundings occurs, its incident shadow diminishes the irradiation and reduces the generated power. Moreover, shading affects the pattern of the power–voltage (P–V) characteristic curve to contain more than one power peak, causing difficulties when developing maximum power point tracking. Consequently, shading leads to a hotspot in which spreading the hotspot widely on the PV panel’s surface increases the heat and causes damage to the panel. Since it is not possible to access the circuit inside the PV cells, indirect measurement and fault detection methods are needed to perform them. This paper proposes the global maximum power point tracking method, including the shading detection and tracking algorithm, using the trend of slopes from each section of the curve. The effectiveness was confirmed from the dynamic short-term testing and real weather data. The hotspot-detecting algorithm is also proposed from the analysis of different PV arrays’ configuration, which is approved by the simulation’s result. Each algorithm is presented using the full mathematical equations and flowcharts. Results from the simulation show the accurate tracking result along with the fast-tracking response. The simulation also confirms the success of the proposed hotspot-detection algorithm, confirmed by the graphical and numerical results.

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Section: Modeling Of Pv Panel In Hotspot Conditionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Global Maximum Power Point Tracking under Shading Condition and Hotspot Detection Algorithms for Photovoltaic Systems

Gosumbonggot

Fujita

2019

Energies

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“…Quando o sistema está submetido a níveis homogêneos de irradiância, ou seja, quando todos os seus módulos recebem o mesmo valor de potência solar, as técnicas convencionais são capazes de rastrear o MPP com eficiência. Entretanto, quando os módulos recebem diferentes níveis de irradiância, em uma condição conhecida como sombreamento parcial ou PSC (sigla em inglês para Partial Shading Condition), a curva P-V, devido às características construtivas do arranjo (Yang et al, 2018), passa a apresentar mais de um pico de potência, sendo que um destes é um pico global e os demais, com valores de potência inferiores, são conhecidos como locais. Nessa condição, as técnicas convencionais rastreiam o primeiro pico a ser encontrado, que pode ser o global ou um local, resultando, ao rastrear um pico local, em perda de potência.…”

Section: Introductionunclassified

Análise de diferentes técnicas de MPPT aplicadas a sistemas fotovoltaicos sob condições de sombreamento parcial

Andrade

Vicente

Tofoli

et al. 2020

Anais Do Congresso Brasileiro De Automática 2020

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Em um painel fotovoltaico, em virtude de obstáculos ou do sombreamento não uniforme, os módulos podem estar expostos a diferentes níveis de irradiância, ocasionando o surgimento de mais de um pico de potência. Para extrair a máxima potência de um sistema fotovoltaico, um rastreador do ponto de máxima potência deve ser utilizado. Este dispositivo é constituído de um conversor CC-CC, capaz de alterar as características da carga conectada ao painel. O objetivo deste trabalho é analisar algumas das diferentes técnicas de rastreamento aplicadas em condições de sombreamento parcial. Este tipo de análise é importante, pois caso um máximo local seja rastreado em detrimento ao máximo global, ocorrerá uma perda de potência significativa. Os resultados computacionais comprovam que técnicas convencionais não são adequadas para essas condições e que as técnicas baseadas em inteligência artificial obtém melhores desempenhos.

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“…Most recently, conventional approaches using distributive MPPT techniques to mitigate hot-spot in PV modules, suggested by S. Yang et al [15] and C. Olalla et al [16] show an approximate reduction up to 20 °C for small and medium hot-spotting areas. Additionally, Y.…”

Section: Introductionmentioning

confidence: 99%

“…To address the reliability issue in MPPT methods, several hardware-based systems have been industrialized, including the bypass diodes method using the integration of bypass diodes in the PV modules sub-strings [11], reconfiguration of PV modules [23], and the distributed MPPT units [15].…”

mentioning

confidence: 99%

70% Decrease of Hot-Spotted Photovoltaic Modules Output Power Loss Using Novel MPPT Algorithm

Dhimish

2019

IEEE Trans. Circuits Syst. II

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The phenomenon of 'Hot-spotting' within photovoltaic (PV) panels, where a mismatched cell/cells heats up, leads to reliability and efficiency issues. In this paper, a novel maximum power point tracking (MPPT) algorithm is developed to compensate for hot-spotted PV module effects, thus increasing the output power and improving reliability. The MPPT algorithm implements two mitigation processes; the first to identify the optimum power-voltage (P-V) curve to track the global maximum power point (GMPP). The second process is to manipulate the output power towards the GMPP through the control of the perturbation step size. In order to verify the appropriateness of the proposed algorithm, multiple hot-spotted PV modules were tested under various environmental conditions. Significantly, the algorithm reduces the hot-spotted PV modules output power loss by at least 70% under all irradiance transition scenarios, slow, medium, and fast.

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Monitoring and Suppression of the Typical Hot-Spot Phenomenon Resulting From Low-Resistance Defects in a PV String

Cited by 17 publications

References 21 publications

Global Maximum Power Point Tracking under Shading Condition and Hotspot Detection Algorithms for Photovoltaic Systems

Global Maximum Power Point Tracking under Shading Condition and Hotspot Detection Algorithms for Photovoltaic Systems

Análise de diferentes técnicas de MPPT aplicadas a sistemas fotovoltaicos sob condições de sombreamento parcial

70% Decrease of Hot-Spotted Photovoltaic Modules Output Power Loss Using Novel MPPT Algorithm

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