Power Quality Improvement in Grid-Connected PV Systems Using Sequence Control
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Abstract
A modified control strategy for grid-connected inverters is presented to enhance the integration of renewable energy sources while effectively addressing challenges arising from unhealthy voltage and current conditions. The study introduces an improved instantaneous reactive power theory–based control scheme that utilizes positive-sequence components of grid voltages and negative-sequence components of load currents to regulate the grid-tied converter. To further enhance dynamic performance, a proportional–integral controller is incorporated to maintain dc-link voltage stability under abnormal grid and load scenarios. The proposed control approach is implemented and validated in MATLAB/Simulink across a range of operating conditions, including steady-state, dc offset, grid harmonics,
unbalanced grid voltages, and non-linear as well as unbalanced loads, both with and without solar PV integration. Simulation results demonstrate significant improvements in power factor correction and reactive power compensation, with robust controller performance under varying irradiance levels. Comparative analysis with recent control schemes highlights the superior performance and effectiveness of the proposed method. Moreover, the total harmonic distortion values obtained across multiple test cases comply with IEEE-
519 standards, confirming the reliability and robustness of the proposed control technique for grid-connected renewable energy systems.
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