Overshoot control of the electromagnetic torque during fault recovery for an SCIG with a STATCOM

Abstract

Squirrel cage induction generators (SCIG) are one of the widely used generators in the wind turbines. The popularity of the SCIG is because of their relatively low price. However, speed and torque control in SCIGs is not as well studied as doubly fed induction generators (DFIG). This leads to more stress in the mechanical parts and more fatigue in the gearbox. In this paper a control method is proposed for limiting the electromagnetic torque overshoot during the recovery process subsequent to a fault. The idea behind the proposed method is to utilize the set point automatic adjustment with correction enabled (SPAACE) method to modify the voltage control loop of the static synchronous compensator (STATCOM) installed at the terminal of the SCIG to limit the torque overshoot.