Power control of induction generator using P-I controllers for wind power applications

Abstract

A line excited cage generator system, with PI control for efficiency optimization and performance enhancement, is discussed in this paper. A squirrel cage induction generator driven by a prime mover feeds the power to a utility grid through two double side pulse width modulated converter system. The generation control system uses three PI controllers. The first PI controller tracks the generator speed with the reference speed for maximum power extraction. The second PI controller controls the direct axis current for reactive power control. The third PI controller provides control of quadrature axis current for active power control. The fourth PI controller is used to maintain the dc link voltage constant. The performance of the PI controlled variable speed wind energy conversion system is evaluated through simulation study in MATLAB. Closed loop speed response of the generator with PI controller show fast speed response can be obtained with well designed PI controllers.