Photovoltaic Energy Yield Improvement in Two-Stage Solar Microinverters

Chub, Andrii; Vinnikov, Dmitri; Stepenko, Serhii; Liivik, Elizaveta; Blaabjerg, Frede

doi:10.3390/en12193774

Cited by 13 publications

(4 citation statements)

References 27 publications

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“…As the cell exposed to the shadow acts as a heating resistor during shielding, the current flowing through it generates additional (Jolule) heat. The contaminant blocks the emission of this heat; therefore, the cell overheats [7,8]. Local overheating can cause the cells to burn out, affecting the operation of the entire solar panel.…”

Section: Forms Of Deposits On the Surface Of The Solar Cellmentioning

confidence: 99%

Exploration of Solar Panel Damage and Service Life Reduction Using Condition Assessment, Dust Accumulation, and Material Testing

2023

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This paper presents a comprehensive inspection of a 10.044 MWp solar power plant that had operational problems. The condition assessment was necessary because the power plant was constantly producing electricity significantly below the expected peak power. The research confirmed that the cause of the decrease in performance is the pollution from the industrial park and the conventional power plant located next to the solar system. The accuracy of the results is confirmed using on-site thermal imaging at the solar power plant and laboratory tests. During the laboratory tests, the electrical performance of 1063 solar panels was examined as well as their damaging and life-reducing effect with further thermography tests. Surface dirt deposition cause several significant problems during energy generation. Power outages are a minor problem, and sustainable production is the main goal in the long term. If the failure and destruction of the solar modules cause more serious damage, the lifetime of the photovoltaic power plants can be shortened.

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Section: Forms Of Deposits On the Surface Of The Solar Cellmentioning

confidence: 99%

Exploration of Solar Panel Damage and Service Life Reduction Using Condition Assessment, Dust Accumulation, and Material Testing

2023

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“…The entire configuration of the investigated system is shown in Fig. 1, while the parameters of the PV module based on Jinko Solar JKM300M-60B are adopted from the work [14]. The PV module operates at the maximum power point (MPP) by adopting the perturb and observe (P&O) technique due to its simplicity.…”

Section: Description Of the Studied Systemmentioning

confidence: 99%

“…The FIDES guidelines are only relevant to ambient temperatures ranging from -55 o C to 125 o C, which is aligned with our mission profile. The general expression for an item failure rate can be given as λ = Π PM Π Process λ Phy (14) where Π PM is the quality and technical control over manufacturing of the item, Π Process comprises all the steps of item processes from specification to field operation and maintenance, and λ Phy is the physical failure rate of the item, which can be calculated in the mission profile phase as…”

Section: B Approach Based On Fides Guidementioning

confidence: 99%

Reliability Evaluation of Isolated Buck-Boost DC-DC Series Resonant Converter

Bakeer

Chub

Shen

2022

IEEE Open J. Power Electron.

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This paper investigates the reliability of an isolated buck-boost DC-DC converter (IBBC) based on the configuration of a series resonant converter (SRC). Two approaches are employed to predict the IBBC reliability, which are based on the MIL-HDBK-217F handbook and FIDES guide. The latter approach can take into account how the failure rate of the converter components based on the physics of failure is influenced by a varying yearly mission profile. To do this, the thermal loading of each IBBC component is obtained, taking into account the photovoltaic (PV) mission profile of the solar irradiance and ambient temperature. In such a case, the PV module is operating at the maximum power point (MPP) and the IBBC transfers this power into the DC microgrid (MG). Second, the componentlevel failure rate is calculated with both reliability assessment approaches, to evaluate the converter-level failure rate. Therefore, the converter reliability can be defined while taking the serial reliability connection of the converter components into account. The reliability analysis is carried out using a cloud Python engine installed and running in a Google Colaboratory notebook. The results indicate that the primary semiconductors are the most vulnerable component in the IBBC. The B10 lifetime of the casestudy IBBC calculated using the MIL-HDBK-217F and FIDES approaches is 14.80 and 23.20 years, respectively. This indicates that, when compared to the methodology from the MIL-HDBK-217F handbook, the approach from the FIDES guide can provide a more accurate prediction for the IBBC lifespan considering the real field mission profile.

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“…For micro-converters, which are of interest to this work, [11] estimated that they can increase the yearly energy yield of a PV system up to 6%, recovering, on average, 36% of the power otherwise lost from partial shading. Other works have investigated the energy production improvement of PV power systems based on micro-inverters, with [12] finding that a twostage solar micro-inverter increased energy production close to 2% in one day, resulting in a reduction in annual energy losses between 22.3% and 26%. A highly efficient micro-inverter topology using LLC resonant converter is studied in [13]; however, dedicated studies are required to assess its energy recovery potential over time.…”

Section: Introductionmentioning

confidence: 99%

Seamless Start-Up of a Grid-Connected Photovoltaic System Using Module-Integrated Micro-Converters

Callegaro,

Uong,

Deilami

2023

Energies

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In traditional grid-tied photovoltaic (PV) installations, when partial shadowing occurs between different PV modules in a string, bypass diodes short-circuit the output terminals of shadowed modules, and the whole system forgoes their potential energy production. This loss can be recovered if a dc-dc converter (micro-converter) is coupled to every PV module, and operated at the maximum power point (MPP). In this scenario, without communication links between the distributed micro-converter and the grid-tied inverter, a start-up procedure must be carefully designed to seamlessly allow the system to transfer PV power to the grid. During this phase, potentially damaging over-voltages and abrupt transients occurring at the micro-converters/inverter interface must be avoided. In this paper, the control algorithm of each micro-converter is enhanced to provide a smooth start-up operation so that PV units can safely start transferring power to the inverter and the grid. Improving from previous works, the proposed control technique is simple and removes the need for current sensors at the output of each micro-converter and at the inverter dc-link, with an economical advantage. Simulation results demonstrate the successful system start-up behavior, whilst confirming the benefits of the proposed control technique. First, the dc-link is energized from the rectified grid voltage. Then, the micro-converters raise the dc-link voltage so that the available PV power is transferred to the grid, with this sequence of operations not causing any abrupt electrical transient. The results also demonstrate the robust behavior of the PV system under non-uniform solar irradiation conditions.

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Photovoltaic Energy Yield Improvement in Two-Stage Solar Microinverters

Cited by 13 publications

References 27 publications

Exploration of Solar Panel Damage and Service Life Reduction Using Condition Assessment, Dust Accumulation, and Material Testing

Exploration of Solar Panel Damage and Service Life Reduction Using Condition Assessment, Dust Accumulation, and Material Testing

Reliability Evaluation of Isolated Buck-Boost DC-DC Series Resonant Converter

Seamless Start-Up of a Grid-Connected Photovoltaic System Using Module-Integrated Micro-Converters

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