Efficacy of Controller Speed on Inertia Response of DFIG

In this paper we studied the effect of the operation speed of the doubly fed induction generator controller on its inertia response. Doubly fed induction generators (DFIG) are commonly used wind turbine generators (WTG) in electricity network. The inertia response of a generator is influenced by the sensitivity of the generator's electromagnetic torque to changes in the power system frequency. DFIG has low inertia response because it's controller takes the slip of machine within fix range. When a dip in grid frequency occurred it couldn't help the system to return back to its optimal value. So, firstly we improved the inertia response of DFIG by adding feedback parameter as a function of the rate of the change of the grid frequency to reference electromagnetic torque and then considered the effect of controller speed. By this, in that condition DFIG released energy in order to reach the frequency to the first value.