Abstract
This paper deals with the modified weighted least-mean square (LMS) control strategy for single-stage, solar photovoltaic (PV) grid-integrated system to enhance the power quality at common coupling point. This control algorithm has fast convergence, fewer oscillations, fast dynamic response, and good steady-state performance than the other LMS-based control algorithm. The incremental conductance-based maximum power point tracking technique is used to obtain the crest power from the PV array, which is used to sustain DC link voltage by proportional–integral controller. The fundamental component of load current is extracted using this proposed control technique to estimate the reference currents of grid. This proposed control algorithm addresses various power quality concerns such as harmonics reduction, power factor correction, and load unbalancing. The VSC of PV array-interfaced grid system feeds real power to the loads, and surfeit real power is injected into the distribution network. The dynamic performance of proposed single-stage PV-fed three-phase system is validated into the MATLAB\Simulink environment at nonlinear loads, and simulated results are validated with test results on an experimental prototype at different environmental conditions such as varying solar irradiation and load unbalancing. Test results are found satisfactory, and total harmonic distortions of grid currents are observed well within limits of the IEEE-519 standard.
Published Version
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