Abstract
This paper deals with an adaptive feed-forward harmonic cancellation (AFFHC) based technique for harmonics elimination of single-stage grid-connected solar photovoltaic (PV) system. The maximum power is extracted from a PV array using drift perturb & observe (P&O) maximum power point tracking (MPPT) algorithm. Moreover, the input DC voltage of the voltage source converter (VSC) is maintained at desired level for MPPT using a proportional integral (PI) controller. The AFFHC control maintains the balanced grid currents, and injects the active power to the grid, eliminates the harmonics currents caused by nonlinear currents and unbalanced loads connected at point of common coupling (PCC). This system maintains the grid current total harmonic distortion (THD) in accordance to the IEEE 519 standard. For improving the dynamic response, a PV feed-forward term is used. This control improves the power quality issues such as load balancing, power factor correction and good dynamic response. Test results demonstrate reactive power compensation of balanced and unbalanced nonlinear loads and the steady-state and dynamic performances of the system.
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