DFCE Based Control of Solar PV-Wind Energy System Interfaced to Distribution Network

Abstract

This paper presents the control of single stage solar PV (Photovoltaic) array with variable speed WECS (Wind Energy Conversion System) using DFCE (Dual Fundamental Component Extraction) based control algorithm for power quality improvement of the distribution network. The variable speed WECS uses P&O (Perturb and Observer) based MPPT (Maximum Power Point Tracking) algorithm for peak power extraction, and it is accomplished by a generator side VSC (Voltage Source Converter). However, the solar PV array maximum power is extracted using INC (Incremental Conductance) based MPPT algorithm through the grid side converter. The solar PV array and WECS, are feeding active power to AC mains at unity power factor through grid side VSC. The grid side VSC control approach is capable of compensating the load harmonics and maintaining the three phase grid currents balanced at variable solar and wind powers. The proposed control algorithm uses the fundamental load current, and voltage components for estimation of reference grid currents. This control algorithm has a self-tuning filter for accurate and fast fundamental component extraction. Tests results have demonstrated the satisfactory performance of proposed grid-tied PV-WECS on a developd prototype in the laboratory.