Voltage stability conditions during normal operation of existing grids is primarily governed by conventional reactive power management. However, during wind power integration, the integrated system behaves erratically causing lots of concern to the grid operators in evacuating the available power from the wind farms. The major thrust in this paper is to study the impact of voltage stability conditions in existing grid arising out of additional wind power integration. This has been performed by monitoring voltage deviation and L-index at critical buses in the pre-integration and post-integration stages. It is observed that consistency of critical bus bars in terms of location and criticality is largely affected due to the combined actions of load variation and degree of wind power penetration. This has been justified through simulation results of IEEE 30-bus test system and Indian 28-bus system. Further, the results emphasize the need for a rigorous reactive power planning for safe and reliable evacuation of wind power through the existing grid.

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