An Efficient Control Scheme Based on PLL Integrated PI Controller for Grid-connected Solar Photovoltaic Systems

Authors

  • Sabisha Sureshbabu Department of Electrical and Electronics Engineering, LBS College of Engineering, Kasaragod, Kerala, India
  • Aseem K Department of Electrical and Electronics Engineering, LBS College of Engineering, Kasaragod, Kerala, India

DOI:

https://doi.org/10.48048/tis.2022.5699

Keywords:

Grid connected VSI, P&O based MPPT, Phase locked loop, PI controller

Abstract

The market for solar energy is growing these days, thanks to recent developments in Photovoltaic (PV) systems. The integration of solar energy to the grid is required for its optimum utilization. A novel control of a single stage 3 phase grid connected solar inverter is presented in this paper. A PV array, Voltage Source Inverter (VSI) for converting dc to ac, and a filter that connects it to the grid are the major components of the proposed system. The inverter output is regulated with respect to the grid using Synchronous Reference Frame (SRF) control. A 3-phase Phase Locked Loop (PLL) is used to lock the grid frequency and phase in relation to inverter output voltage. The Perturb and Observe (P&O) algorithm is used to obtain the reference voltage corresponding to the maximum PV power. To remove the high frequency harmonics, the inverter output is combined with an LCL filter. The dynamic performance of the proposed system under the number of stochastic environmental conditions are validated using MATLAB Simulink platform.

HIGHLIGHTS

  • The proposed PLL integrated PI controller provided high robustness under stochastic environmental conditions
  • Enhanced system dynamic performance and accurate MPP tracking
  • The inverter output is free from the high frequency harmonics
  • Improved control performance


GRAPHICAL ABSTRACT

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Published

2022-08-15

Issue

Vol. 19 No. 16 (2022): Trends in Sciences, Volume 19, Number 16, 15 August 2022

Section

Research Articles

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Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.