Investigation various types of frequency support methods and inertial control techniques in power systems based on variable speed wind turbines

The motivation to reduce environmental pollution has caused the rapid growth of renewable energy sources (RES) in power systems. However, several technical challenges are common in the high penetration of RES and wind farms (WF). The most important challenge is to achieve frequency stability in new systems. Because WF provide less storage, power compared to synchronous generators. In addition, due to the connection of wind farms to the AC grid through electronic power converters, new power systems have little inertia and WF cannot participate in frequency regulation with other conventional production sources in normal operation. Recently, with the increasing expansion of wind farms in power systems, their participation in supporting and stabilizing the frequency in the event of disturbances in the production or consumption of power systems has been highly considered. Therefore, in this research, firstly, it investigates the way of simulating the inertia of synchronous generators in wind turbines in order to increase the inertia of power and frequency control systems. Then, a review of various strategies and the latest developments in the field of solving the challenges of the presence of wind farms in the direction of temporary frequency support in power systems has been done. Finally, the studies conducted in inertial control techniques and system frequency for variable speed wind turbines have been investigated, categorized and compared.