Effects of inertia emulation in modern wind parks on isolated power systems

Inertia issues due to increased use of modern wind turbines (WTs) have gained increased attention during the last years, especially in isolated power systems with limited frequency control capabilities. Therefore, different control strategies to allow inertial response from WTs have been proposed, either by considering deloaded operation or by using part of the kinetic energy stored in the blades. Other control strategies including additional equipment like flywheels or supercapacitors can also be found in the literature. In this paper, a comprehensive analysis of main effects of modern WTs with inertia emulation on the dynamic performance of a medium-sized isolated power system is presented. Simulation results indicate that inertia emulation in WTs can improve system frequency response and avoid the activation of under-frequency load shedding schemes during large power imbalances, thus significantly improving system security.