Estimating Generated Power of Photovoltaic Systems During Cloudy Days Using Gene Expression Programming

Al-Hilfi, Hasanain A. H.; Abu-Siada, A.; Shahnia, Farhad

doi:10.1109/jphotov.2020.3029217

Cited by 10 publications

(4 citation statements)

References 29 publications

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“…In recent years, the development of the distributed photovoltaic power generation system that is "self-generated and self-used, surplus on-grid" is vigorously advocated in all countries [1][2][3]. Distributed photovoltaic power generation refers to photovoltaic power generation facilities that are constructed at or near consumers and users, and whose operation mode is mainly self-consumption on the user side.…”

Section: Introductionmentioning

confidence: 99%

Energy Loss Analysis of Distributed Rooftop Photovoltaics in Industrial Parks

Li¹,

Huang²,

Tan³

et al. 2023

Energy Engineering

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The analysis of the loss of distributed photovoltaic power generation systems involves the interests of energy users, energy-saving service companies, and power grid companies, so it has always been the focus of the industry and society in some manner or another. However, the related analysis for an actual case that considers different cooperative corporations' benefits is lacking in the presently available literature. This paper takes the distributed rooftop photovoltaic power generation project in an industrial park as the object, studies the analysis and calculation methods of line loss and transformer loss, analyzes the change of transformer loss under different temperatures and different load rates, and compares the data and trend of electricity consumption and power generation in industrial parks before and after the photovoltaic operation. This paper explores and practices the analysis method of the operating loss of distributed photovoltaic power generation and provides an essential reference for the benefit analysis and investment cost estimation of distributed photovoltaic power generation systems in industrial parks. The analyzed results reveal that the change loss is stable after the photovoltaic is connected, and there is no additional transformer loss. And before and after the photovoltaic system installation, there was no significant change in the total monthly data difference between the total meter and the sub-meter.

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Section: Introductionmentioning

confidence: 99%

Energy Loss Analysis of Distributed Rooftop Photovoltaics in Industrial Parks

Li¹,

Huang²,

Tan³

et al. 2023

Energy Engineering

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“…Literature (Al-Shetwi et al, 2019) has presented an overview and comparison of several LVRT capability enhancement approaches during grid fault conditions. Among those approaches, the LVRT capability improvement utilizing ESSs is adopted in this paper, which is the common solution to mitigate the PV systems generated power variability (Al-Hilfi et al, 2021). Since the ESSs have the feature of absorbing and releasing energy, the problem of overvoltage on DClink can be well improved by connecting the ESSs to the DC-link through the buck-boost DC-DC converter.…”

Section: Introductionmentioning

confidence: 99%

Impact of large-scale photovoltaic-energy storage power generation system access on differential protection of main transformer under symmetrical faults

Yang¹,

Zhang

Zhang³

et al. 2023

Front. Energy Res.

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The low voltage ride-through (LVRT) requirements demand large-scale photovoltaic (PV) power generation system remain connected to the grid during faults. It results in considerable impact on the characteristics of fault current. This paper combines charge-discharge characteristics of the energy storage (ES) with PV generation system to enhance the LVRT capability. Based on the inverter control strategy and specific LVRT requirements, fault current characteristics of the PV-ES power generation system is discussed in this paper. In order to analyze the fault characteristic, the fault current expression as three-phase short-circuit faults occurs on both sides of the main transformer is calculated. Furthermore, taking the winding connection of the transformer into account, the ratio of differential current to braking current is further derived to find out the factors influencing the performance of the transformer differential protection. It is found that factors influencing the transformer differential protection include the rated capacity of the PV-ES generation system, fault severity, the length of transmission line and so on. And as the rated capacity of the PV-ES power generation system increase, the transformer differential protection would experience reduced sensitivity or even do not trip. The findings of this paper can lay a foundation for further improvement of the transformer differential protection. The elaborate performance evaluation of transformer differential protection, including the operation condition of the second harmonic braking element, is presented and verified by simulation using MATLAB/Simulink.

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“…However, in the presence of active power disturbances, the dc-link voltage is prone to fluctuations. These active power disturbances are mainly divided into three categories, namely: (1) Variations in climatic conditions, such as temperature and solar irradiance [9,10]; (2) voltage sag fault on the grid; and (3) inevitable power exchange fluctuations between the dc side of the inverter and the grid. Besides, the inverter itself is also a sensitive system with non-constant parameters and non-linear variations.…”

Section: Introductionmentioning

confidence: 99%

A Modified LADRC-Based DC-Link Voltage Controller for Photovoltaic Grid-Connected Inverters

Zhou

Liu

et al. 2021

Electronics

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To enhance the robust stability of the dc-link voltage in the photovoltaic (PV) grid-connected system, a modified linear active disturbance rejection control (LADRC)-based regulation strategy is presented in this paper. The proposed control strategy is equipped with the cascaded extended state observer, which can supplement the disturbance information not estimated by the conventional one, thereby achieving a relatively fast and accurate disturbance reconstruction. The tracking performance and disturbance rejection performance of the modified LADRC are discussed and studied in the frequency domain. Finally, the experimental results are provided to verify the theoretical analysis.

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Estimating Generated Power of Photovoltaic Systems During Cloudy Days Using Gene Expression Programming

Cited by 10 publications

References 29 publications

Energy Loss Analysis of Distributed Rooftop Photovoltaics in Industrial Parks

Energy Loss Analysis of Distributed Rooftop Photovoltaics in Industrial Parks

Impact of large-scale photovoltaic-energy storage power generation system access on differential protection of main transformer under symmetrical faults

A Modified LADRC-Based DC-Link Voltage Controller for Photovoltaic Grid-Connected Inverters

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