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This paper is dealing with the reactive power management of two kinds of variable speed wind turbine (WT) technologies in order to respect the grid code requirements during voltage dips. Nowadays, the WT systems are asked to fulfil with many grid connection requirements, especially to provide reactive power during dip voltage with the aim of better voltage recovering. Specific controls applied to Double Fed Induction generator WT (DFIG) and Permanent Magnet Synchronous Generator fully interfaced (PMSG) are proposed in this paper to meet with these requirements. The control laws are studied through simulations; results analysis shows their efficiency and their limits.