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A Harmonic Compensation Method Using a Lock-In Amplifier under Non-Sinusoidal Grid Conditions for Single Phase Grid Connected Inverters

Author

Listed:
  • Reyyan Ahmad Khan

    (Department of Electrical Engineering, Soongsil University, Seoul 06978, Korea)

  • Muhammad Noman Ashraf

    (Department of Electrical Engineering, Soongsil University, Seoul 06978, Korea)

  • Woojin Choi

    (Department of Electrical Engineering, Soongsil University, Seoul 06978, Korea)

Abstract

The power quality of grid-connected inverters (GCIs) is attracting a lot of attention as the number of distributed generation systems with renewable energy sources are increased. It is well known that the harmonics present in the grid have a lot of detrimental effects on the equipment and devices connected to a power system network such as heating and derating. These effects lead to problems in terms of safety and lifespan. Therefore, harmonic standards such as IEEE 519 and P1547 suggest that GCIs should achieve total harmonic distortion (THD) of the output current that is less than 5%. However, it is not easy to achieve the current THD of GCIs that is less than 5% with only an output filter under distorted grid conditions. In this paper, a harmonic compensation method using a lock-in amplifier (LIA) is proposed. Due to the outstanding performance of the LIA, accurate information of the harmonics can be obtained. This information is used to eliminate the harmonics by the simple PI controller. To demonstrate the superiority of the proposed method, it is applied to a 5 kW single phase GCI connected to the real grid. The results obtained are compared with those of the conventional harmonic compensation methods.

Suggested Citation

  • Reyyan Ahmad Khan & Muhammad Noman Ashraf & Woojin Choi, 2021. "A Harmonic Compensation Method Using a Lock-In Amplifier under Non-Sinusoidal Grid Conditions for Single Phase Grid Connected Inverters," Energies, MDPI, vol. 14(3), pages 1-17, January.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:3:p:597-:d:486761
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    Citations

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    Cited by:

    1. Farhan Farooq & Asad Khan & Seung June Lee & Mohammad Mahad Nadeem & Woojin Choi, 2021. "A Multi-Channel Fast Impedance Spectroscopy Instrument Developed for Quality Assurance of Super-Capacitors," Energies, MDPI, vol. 14(4), pages 1-14, February.
    2. Tila Muhammad & Adnan Umar Khan & Muhammad Tajammal Chughtai & Reyyan Ahmad Khan & Yousra Abid & Muhammad Islam & Sheroz Khan, 2022. "An Adaptive Hybrid Control of Grid Tied Inverter for the Reduction of Total Harmonic Distortion and Improvement of Robustness against Grid Impedance Variation," Energies, MDPI, vol. 15(13), pages 1-21, June.

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