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Improved adaptive notch filter-based active damping method for shunt active power filter with LCL-filter

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Abstract

The LCL-filter has been recently used with grid-connected converters to mitigate switching ripple harmonics. The LCL-filter presents a better attenuation performance for switching ripple harmonics in comparison with L- and LC-type filters. However, the application of LCL-filter has two basic constraints on the circuit design and the resonance problem. These constraints can be effortlessly overcome for grid-connected converters which operate on the utility fundamental frequency. On the other hand, these constraints become a challenging issue when the LCL-filter is used with shunt active power filter (SAPF) because of the wide operation frequency bandwidth of SAPF. This wide operation bandwidth of SAPF causes a narrow bandwidth for the selection of LCL-filter cutoff frequency and the resonance damping control. In this paper, the application constraints of LCL-filter are discussed and the LCL-filter design is provided for SAPF. In addition, an adaptive notch filter-based single-loop active damping method is developed considering the wide operation bandwidth of SAPF. The proposed method consists of a grid impedance estimation algorithm in order to update notch filter parameters adaptively against grid impedance variations. By the help of the single-loop active damping strategy, the proposed controller does not require any additional sensor for the current measurement of LCL-filter capacitor to damp resonance currents. The stability analysis of proposed controller is performed through pole–zero maps. The proposed method is tested, and its performance is verified with comprehensive case studies of a 400-V 80-kVA SAPF simulation model through MATLAB/Simulink.

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Authors and Affiliations

  1. Department of Electrical and Electronics Engineering, Çukurova University, Adana, Turkey

    Mehmet Büyük & Adnan Tan

  2. Department of Electrical and Electronics Engineering, Adana Science and Technology University, Adana, Turkey

    Mehmet Tümay

Authors
  1. Mehmet Büyük
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  2. Adnan Tan
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  3. Mehmet Tümay
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Correspondence to Mehmet Büyük.

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Büyük, M., Tan, A. & Tümay, M. Improved adaptive notch filter-based active damping method for shunt active power filter with LCL-filter. Electr Eng 100, 2037–2049 (2018). https://doi.org/10.1007/s00202-018-0685-9

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  • DOI: https://doi.org/10.1007/s00202-018-0685-9

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