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Modified SRFPLL harmonic support island detection in integrated electric grid

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Abstract

Phase-locked loop (PLL) detects the total harmonic distortion variation by considering the fundamental component of current and voltage. The conventional PLL harmonic monitoring method considers only the fundamental harmonic content to decide the islanding. This paper proposes technique by introducing modified synchronous reference frame PLL to detect island condition with support of harmonic variation at point of common coupling. The proposed method can detect state of island using fundamental 3rd, 5th, and 7th harmonic content to decide the islanding condition. Three different islanding conditions and five different non-islanding conditions were taken into consideration for analysing the proposed method. The proposed method was compared with the conventional PLL to evaluate the effectiveness. The simulation results were tested and validated with experiment results, and the proposed method is recommended as another effective alternative for islanding detection. Also the proposed method has been tested for multiple distributed generation sets connected to the grid for testing of effectiveness of technique.

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  1. Department of Electrical and Electronics Engineering, Lakireddy Bali Reddy College of Engineering (Autonomous), Mylavaram, Krishna Dt., Andhra Pradesh, 521230, India

    K. Harinadha Reddy

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  1. K. Harinadha Reddy
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Reddy, K.H. Modified SRFPLL harmonic support island detection in integrated electric grid. Electr Eng 104, 1305–1315 (2022). https://doi.org/10.1007/s00202-021-01384-5

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