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A Real-Time Harmonic Extraction Approach for Distorted Grid

Author

Listed:
  • Po Li

    (Department of Instrumental and Electrical Engineering, School of Aerospace Engineering, Xiamen University, Xiamen 361102, China)

  • Xiang Li

    (Department of Instrumental and Electrical Engineering, School of Aerospace Engineering, Xiamen University, Xiamen 361102, China)

  • Jinghui Li

    (Department of Instrumental and Electrical Engineering, School of Aerospace Engineering, Xiamen University, Xiamen 361102, China)

  • Yimin You

    (School of Electrical Engineering and Automation, Xiamen University of Technology, Xiamen 361024, China)

  • Zhongqing Sang

    (School of Electrical Engineering and Automation, Xiamen University of Technology, Xiamen 361024, China)

Abstract

Harmonic interference is a major hazard in the current power system that affects power quality. How to extract harmonics quickly and accurately is the premise to ensure the sustainable operation of power system, which is particularly important in the field of new energy power generation. In this paper, a harmonic extraction method based on a time-varying observer is proposed. Firstly, a frequency estimation algorithm is used to estimate the power grid current frequency, which can estimate the frequency in real time. Then, applying the zero-crossing detection method to convert the frequency into a phase variable. Finally, using the phase variable and integral current signal as input, a observer is modeled to extract each order harmonic component. The proposed method is evaluated on a FGPA test platform, which shows that the method can extract the harmonic components of the grid current and converge within 80 ms even in the presence of grid distortions. In the verification case, the relative errors of the 1st, 5th, 7th and 11th harmonics are 0.005%, −0.003%, 0.251% and 0.620%, respectively, which are sufficiently small.

Suggested Citation

  • Po Li & Xiang Li & Jinghui Li & Yimin You & Zhongqing Sang, 2021. "A Real-Time Harmonic Extraction Approach for Distorted Grid," Mathematics, MDPI, vol. 9(18), pages 1-20, September.
    • Handle: RePEc:gam:jmathe:v:9:y:2021:i:18:p:2245-:d:633983
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    References listed on IDEAS

    as
    1. Sharma, A. & Rajpurohit, B.S. & Singh, S.N., 2018. "A review on economics of power quality: Impact, assessment and mitigation," Renewable and Sustainable Energy Reviews, Elsevier, vol. 88(C), pages 363-372.
    2. Mahdi Shademan & Alireza Jalilian & Mehdi Savaghebi, 2021. "Improved Control Method for Voltage Regulation and Harmonic Mitigation Using Electric Spring," Sustainability, MDPI, vol. 13(8), pages 1-16, April.
    3. Emad Samadaei & Mina Iranian & Mohammad Rezanejad & Radu Godina & Edris Pouresmaeil, 2018. "Single-Phase Active Power Harmonics Filter by Op-Amp Circuits and Power Electronics Devices," Sustainability, MDPI, vol. 10(12), pages 1-13, November.
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