Robust L Approximation of an LCL Filter Type Grid-Connected Inverter Using Active Disturbance Rejection Control under Grid Impedance Uncertainty

Muhammad Saleem, Muhammad Hanif Ahmed Khan Khushik, Hira Tahir and Rae-Young Kim
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Muhammad Saleem: Department of Electronics Engineering Technology, The Benazir Bhutto Shaheed University of Technology & Skill Development, Khairpur Mirs 66020, Pakistan
Muhammad Hanif Ahmed Khan Khushik: Department of Electronics Engineering Technology, The Benazir Bhutto Shaheed University of Technology & Skill Development, Khairpur Mirs 66020, Pakistan
Hira Tahir: Department of Electrical Engineering, Hanyang University, Seoul 04763, Korea
Rae-Young Kim: Department of Electrical Engineering, Hanyang University, Seoul 04763, Korea

Energies, 2021, vol. 14, issue 17, 1-21

Abstract: High-order filters, such as LCL , are more commonly employed in grid-connected inverters (GcIs) as an interference element for the better attenuation of switching harmonics. However, LCL filters may have resonance poles and antiresonance zeros in the frequency response with inverter side current. This may affect the stability of the system and limit the control bandwidth with the simple single-loop PI control. This becomes severe with the introduction of grid impedance due to the large distance between renewable energy sources and the power grid. To mitigate this effect, active damping and sensorless damping is preferred with pre-information about grid impedance. In this paper, linear active disturbance rejection control (ADRC) is introduced, first to L filter type GcI and later extended to LCL filter type GcIs with minimum modification. From the frequency analysis, it is shown that the characteristics of the proposed control scheme remain the same even with a change in filter order and grid impedance. The resonance poles and antiresonance zeros in the LCL filter are compensated via the pole–zero cancelation technique. In addition to this, the preserve bandwidth, simple control design, and decoupled current control are also achieved with the proposed method. The robustness of the proposed method is compared with the single-loop PI control under different filter types and grid impedance uncertainty through MATLAB simulation and experimental outcomes.

Keywords: active disturbance rejection control (ADRC); extended state observer (ESO); grid-connected inverter; LCL filter; grid impedance; resonance and antiresonance effect (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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