This work presents an improved phase-locked loop (Ipll)-basedcontrol for grid-integrated photovoltaic (PV) system (GIPVS). It is used to extract amplitude, frequency, and phase angle of distorted load currents to con...
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This work presents an improved phase-locked loop (Ipll)-basedcontrol for grid-integrated photovoltaic (PV) system (GIPVS). It is used to extract amplitude, frequency, and phase angle of distorted load currents to control PV-grid-interfaced voltage source converter (VSC). The VSC controls active and reactive powers at unbalances and distortions in the grid voltages. The controlalgorithm of VSC includes power feed-forward term, DC-link voltage, and grid voltages. The feed-forward term improves the dynamic performance of a GIPVS and enhances the utilisation of VSC. Three-phase Iplls extract the in-phase components of three-phase load currents at utility frequency. Further, these in-phase components of load currents are used for estimation of reference-grid currents. The proposed Ipll-based control algorithm offers good dynamic response even under unbalanced load condition. The efficient working of Ipll-based control algorithm is realised by extracting maximum power from PV-grid system and through its power-quality improvement. The perturb and observe (P & O) controlalgorithm is used for optimum utilisation of a PV array. A developed prototype of PV-grid system is used to implement an Ipll-based control algorithm under different operating conditions.
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