Abstract
This article deals with a widely linear reduced-complexity quaternion least mean square (WL-RC-QLMS) controlled two-stage photovoltaic (PV) grid system. The WL-RC-QLMS-based current control method is developed, and the function of this control technique is to attenuate the higher order and suborder harmonic components from the distorted load currents, even when the load currents are nonlinear and/or unbalanced. Moreover, the Luenberger observer is used to control the dc-link voltage. The Luenberger observer is equipped with the cascaded state observers, which can reject the overshoot and undershoot at the dc bus voltage rapidly and precisely. The proposed WL-RC-QLMS controller is modeled and the controller is developed in a Simulink environment and validated on a laboratory prototype. The grid current condition measured in terms of total harmonics distortion is found under the restraint of IEEE 519 standard in different working conditions, which exhibits the efficacy of the implemented control.
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