A comparison of conventional and modified vector control strategies for controlling transient currents and voltage dips in grid‐connected wind and photovoltaic hybrid system

Abstract

AbstractA comparison of conventional and modified vector control strategies for controlling transient currents and voltage dips in grid‐connected wind and photovoltaic (PV) hybrid system is the purpose of this paper. The wind system is composed of three‐bladed rotor with a corresponding mechanical gearbox, a doubly fed induction generator, two power converters (rotor side converter [RSC] and grid side converter), a DC‐link capacitor that put with PV generator, and a grid filter. The big difficulty encountered for a wind and PV hybrid system is to withstand the voltage dip to avoid severe unbalanced grid voltage and transient currents that can damage the RSC. Simulation results show that with the new control, the wind and PV hybrid is able to eliminate large unbalanced grid voltages dips. The non‐negligence of the stator flux is taken into account of the modified control. Oscillation of rotor currents and overvoltage in the DC bus are low by the modified control strategy. The modified vector control constitutes a good alternative solution to overcome the problem introduced by voltage dips.