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PV integrated grid synchronization technique using modified SOGI-FLL and zero-crossing detector

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Abstract

The operation of a grid-connected photovoltaic (PV) system with improvement in power quality depends mostly on the estimation of synchronizing signals. A hybrid algorithm for the estimation of the synchronizing unit templates has been proposed in this paper. Modified second-order generalized integrator (MSOGI) has been combined with the frequency locked loop (FLL) and the traditional zero-crossing detector (ZCD) to extract the synchronizing signal. The synchronizing signal produced from the proposed technique has almost zero total harmonic distortion. Work on the proposed MSOGI-FLL-ZCD has been verified through simulation and experimental studies conducted under different grid voltage problems such as phase shift, frequency change, harmonic, DC-offset and noise. In addition, the proposed algorithm has been successfully applied to the three-phase grid-connected solar PV system for improving power quality.

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Acknowledgements

The authors are thankful to the Department of Science and Technology, Science and Engineering Research Board for the Sponsored Project (EMR/2016/001874).

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Authors and Affiliations

  1. Delhi Technological University, Delhi, India

    Hemant Saxena, Alka Singh & Jitendra Nath Rai

  2. Thapar Institute of Engineering and Technology, Patiala, India

    Manoj Badoni

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  1. Hemant Saxena
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  2. Alka Singh
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  3. Jitendra Nath Rai
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  4. Manoj Badoni
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Correspondence to Alka Singh.

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Appendix

Appendix

Experimental system parameters \(V_\mathrm{LL}(RMS)=110\) V, \(f=50\) Hz, \(L_d=1\) mH, \(L_p=3\) mH, Non-linear load; Full bridge rectifier with 2 kW rated resistive load for 240 V and \(L_L=80\) mH, \(V_\mathrm{dc}=200\) V, \(k_p=0.05, k_i=0.006\), Sampling Time \(T_s= 50~\upmu \)s, PV array parameter from simulator; maximum power point voltage \(V_\mathrm{mp}=200\) V, Maximum power point current \(I_\mathrm{mp}=2.5\) A, Maximum power \(P_\mathrm{mp}=0.5\) kW.

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Saxena, H., Singh, A., Rai, J.N. et al. PV integrated grid synchronization technique using modified SOGI-FLL and zero-crossing detector. Electr Eng 104, 1361–1372 (2022). https://doi.org/10.1007/s00202-021-01394-3

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