Background: This paper reviews the requirements imposed by Transmission System
Operators (TSOs) in their grid codes to address intolerable implications of integrating large Wind
Power Plants (WPPs) to the grid. Besides the common objectives, terminologies used by different
TSOs were distinct. Therefore, developing a harmonized grid code is imperative.
Introduction: On the recommendation of the European Commission, European Network of Transmission
System Operators for Electricity (ENTSO-E) has made concerted efforts in the direction of
developing a harmonized grid code, and published its document in March 2013.
Method: Several TSOs have updated their grid codes in accordance with the increasing wind energy
penetration. We have made an effort to present a comparison between different integration requirements
specified by different grid codes. The outcomes presented will certainly be beneficial to
the countries, which are in the process of enacting their own grid code.
Results: We have reviewed different grid codes in terms of Low Voltage Ride-Through (LVRT)
requirement, operating voltage and frequency range, active power control (frequency regulation)
and reactive power support (voltage regulation).
Conclusion: The present study envisages helping wind turbine manufacturers and WPP developers,
as it would provide them a clear insight into the regulations imposed on WPPs as included/
updated in different grid codes.