Abstract:
A frequency integrated approach on a multi-order generalized integrator and a self-tuned discrete proportional plus integral regulator (PIR) is used to extract peak power from a three-phase double-stage grid-tied photovoltaic (PV) energy system and feed it to the load and grid.
Even with linear or nonlinear, balanced or unbalanced load currents, this unique frequency integrated multi-order generalized integrator (FIMOGI) attenuates higher-order and sub-order harmonic components. Integrated frequency technique eliminates VSC switching frequency variance without FLL and enhances grid-fed VSC power synchronization.
In addition, self-tuned PIR regulates DC-link voltage under dynamic and disturbance conditions. The implemented control includes a PV power feed-forward term to increase transient performance. Simulink is used to model and create the FIMOGI controller, which is tested on a lab prototype.
Simulated and experimental performance is under nonlinear balanced and unbalanced load and solar insolation increase and decrease. The grid current condition evaluated in total harmonics distortion during simulation and validation under IEEE-519 standard constraints in different working conditions shows the control’s efficacy.
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