Inertial support performance of grid connected DFIG

Wind generators (WTGs) can be classified as two types: Fixed speed wind generator (FSWTG) and Variable speed type (VSWTG). The variable speed type has a number of variants such as Doubly Fed Induction Generator (DFIG), Multi-pole Synchronous Generator, and Permanent Magnet Synchronous Generators. DFIGs are already complying with most of the operating requirements set by different markets. The next stage is the inertial energy support during frequency events, particularly during large events. This paper discusses the emulation of inertial response of DFIGs in 3-steps - how the Kinetic energy stored in the rotating blades of variable speed wind generators is extracted by using a supplementary control system. The 3-steps used are 1) only electrical system including WF inertial support, 2) hydro dominated electrical system with WF inertial supports, and 3) multi-bus network with different generators and WF having full model of DFIGs.