A practical technique for on-line monitoring of a photovoltaic plant connected to a single-phase grid

Yahyaoui, Imene; Segatto, Marcelo E. V.

doi:10.1016/j.enconman.2016.11.031

Cited by 44 publications

(23 citation statements)

References 28 publications

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“…When an open circuit fault emerged in one of the PV strings, the reduced portion of the output current of the PV array is equal to the current of the faulty string. Under these circumstances, the current indicator can be calculated as follows [21]:…”

Section: Open-circuit Faultsmentioning

confidence: 99%

“…Similarly, when a short-circuited PV module occurred in one of the PV strings, the reduced portion of the output voltage of the PV array is equal to the voltage of the short-circuited PV module. Based on this situation, the voltage indicator can be calculated as follows [21]:…”

Section: Short-circuit Faultsmentioning

confidence: 99%

“…But the effectiveness of these mathematical model-based fault detection methods depends heavily on the accuracy of the models. Silvestre et al [20] and Yahyaoui and Segatto [21] present a new procedure for automatic fault detection in grid-connected PV systems based on the evaluation of current and voltage indicators where the computational complexity is reduced through minimizing the number of monitoring sensors. However, this method cannot distinguish between degradation faults and partial shading faults of the PV modules in a PV array.…”

Section: Introductionmentioning

confidence: 99%

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A Fault Detection Method for Photovoltaic Systems Based on Voltage and Current Observation and Evaluation

Pei

Hao

2019

Energies

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Photovoltaic (PV) power generation systems work chronically in various climatic outdoor conditions, therefore, faults may occur within the PV arrays in PV systems. Online fault detection for the PV arrays are important to improve the system’s reliability, safety and efficiency. In view of this, a fault-detection method based on voltage and current observation and evaluation is presented in this paper to detect common PV array faults, such as open-circuit, short-circuit, degradation and shading faults. In order to develop this detection method, fault characteristic quantities (e.g., the open-circuit voltage, short-circuit current, voltage and current at the maximum power point (MPP) of the PV array) are identified first to define the voltage and current indicators; then, the fault-detection thresholds are defined by utilizing voltage and current indicators according to the characteristic information of various faults; finally, voltage and current indicators evaluated at real-time voltage and current data are compared with the corresponding thresholds to detect potential faults and fault types. The performances of the proposed method are simulated verifying by setting eight different fault patterns in the PV array. Simulation experimental results show the effectiveness of the proposed method, especially the capacities of distinguishing the degradation faults, partial shading faults and variable shading faults.

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Section: Open-circuit Faultsmentioning

confidence: 99%

Section: Short-circuit Faultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Fault Detection Method for Photovoltaic Systems Based on Voltage and Current Observation and Evaluation

Pei

Hao

2019

Energies

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“…Under practical conditions, faults are unavoidable in PV systems, particularly on the direct current (DC) side where open circuit faults, short circuits faults, hotspot faults, and total and partial shading faults are possible (Chouder and Silvestre, 2010;Hachana et al, 2016;Silvestre et al, 2015;Yahyaoui and Segatto, 2017). Faults on the DC side of PV systems can result in energy loss, system shutdown and even in serious safety breaches (Brooks, 2011;Alam et al, 2015).…”

Section: The State Of the Artmentioning

confidence: 99%

Statistical fault detection in photovoltaic systems

et al. 2017

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Faults in photovoltaic (PV) systems, which can result in energy loss, system shutdown or even serious safety breaches, are often difficult to avoid. Fault detection in such systems is imperative to improve their reliability, productivity, safety and efficiency. Here, an innovative model-based fault-detection approach for early detection of shading of PV modules and faults on the direct current (DC) side of PV systems is proposed. This approach combines the flexibility, and simplicity of a one-diode model with the extended capacity of an exponentially weighted moving average (EWMA) control chart to detect incipient changes in a PV system. The one-diode model, which is easily calibrated due to its limited calibration parameters, is used to predict the healthy PV array’s maximum power coordinates of current, voltage and power using measured temperatures and irradiances. Residuals, which capture the difference between the measurements and the predictions of the one-diode model, are generated and used as fault indicators. Then, the EWMA monitoring chart is applied on the uncorrelated residuals obtained from the one-diode model to detect and identify the type of fault. Actual data from the grid-connected PV system installed at the Renewable Energy Development Center, Algeria, are used to assess the performance of the proposed approach. Results show that the proposed approach successfully monitors the DC side of PV systems and detects temporary shading.Peer ReviewedPostprint (author's final draft

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“…The functioning of solar photovoltaic arrays obviously requires having high quality real-time measurements (monitoring) and a data storing system for several essential parameters; see also, for example, [2][3][4][5]. A wide variety of the control and monitoring systems for photovoltaic arrays was discussed in [6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

New Monitoring System for Photovoltaic Power Plants’ Management

Beránek¹,

Olšan

Libra

et al. 2018

Energies

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An innovative solar monitoring system has been developed. The system aimed at measuring the main parameters and characteristics of solar plants; collecting, diagnosing and processing data. The system communicates with the inverters, electrometers, metrological equipment and additional components of the photovoltaic arrays. The developed and constructed long working system is built on special data collecting technologies. At the generating plants, a special data logger BBbox is installed. The new monitoring system has been used to follow 65 solar plants in the Czech Republic and elsewhere for 175 MWp. As an example, we have selected 13 PV plants in this paper that are at least seven years old. The monitoring system contributes to quality management of plants, and it also provides data for scientific purposes. Production of electricity in the built PV plants reflects the expected values according to internationally used software PVGIS (version 5) during the previous seven years of operation. A comparison of important system parameters clearly shows the new solutions and benefits of the new Solarmon-2.0 monitoring system. Secured communications will increase data protection. A higher frequency of data saving allows higher accuracy of the mathematical models.

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A practical technique for on-line monitoring of a photovoltaic plant connected to a single-phase grid

Cited by 44 publications

References 28 publications

A Fault Detection Method for Photovoltaic Systems Based on Voltage and Current Observation and Evaluation

A Fault Detection Method for Photovoltaic Systems Based on Voltage and Current Observation and Evaluation

Statistical fault detection in photovoltaic systems

New Monitoring System for Photovoltaic Power Plants’ Management

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