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A robust generalized soft-root-sign adaptive filter algorithm for a grid-coupled PV system

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Abstract

The power quality of the grid-coupled photovoltaic system (GCPVS) is enhanced using a control scheme developed by employing a robust generalized soft-root-sign (GSRS) adaptive filter. Power quality (PQ) deterioration issues are common in the distribution grid due to the mix of irregular loads. The GSRS control scheme mitigates harmonics, compensates load unbalances, achieves unity power factor at the grid, and compensates load reactive power, thus leading to balanced sinusoidal currents at the grid side. The GSRS algorithm utilizes a soft-root-sign cost function to achieve less steady-state misalignment while estimating magnitudes of fundamental frequency load current components for PQ improvement. The designed single-stage GCPVS performs smooth power flow between local loads and the grid without necessitating an energy storage system. The control scheme initially meets load demand and then sends any surplus power to the grid. However, if the generated PV power falls below the load demand due to environmental conditions, the additional power for the load is drawn from the grid. Moreover, voltage source converter used in the GCPVS also provides the functionality of DSTATCOM, thus avoiding the usage of additional equipment. The proposed GSRS control scheme and the GCPVS are modeled in MATLAB/Simulink. A laboratory-designed experimental setup is used to carry out the experimental validation of the GSRS control scheme and found to be performing satisfactorily. The behavior of GCPVS is verified during steady-state and dynamic conditions. The GCPVS performance is verified with the standard IEEE-519-2022, and a comparison of the GSRS algorithm with other filtering algorithms is provided.

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Authors and Affiliations

  1. Department of Electrical Engineering, National Institute of Technology Rourkela, Rourkela, Odisha, India

    Markala Karthik, N. Venkata Ramana Naik & Anup Kumar Panda

Authors
  1. Markala Karthik
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  2. N. Venkata Ramana Naik
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  3. Anup Kumar Panda
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Contributions

MK was involved in conceptualization, methodology, formal analysis and investigation, and writing—original draft preparation. NVRN was involved in formal analysis and investigation. AKP was involved in review and editing. All authors reviewed the manuscript.

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Correspondence to Markala Karthik.

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Karthik, M., Naik, N.V.R. & Panda, A.K. A robust generalized soft-root-sign adaptive filter algorithm for a grid-coupled PV system. Electr Eng 106, 2537–2553 (2024). https://doi.org/10.1007/s00202-023-02097-7

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  • DOI: https://doi.org/10.1007/s00202-023-02097-7

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