Performance Analysis of Grid-connected WRIG using Combined Input Voltage Control and Slip Power Control Schemes

Abstract

With the increasing application of wind power based energy conversion systems, various technologies are developed for analyzing the performance of grid-connected wound rotor induction generator (GWRIG). Input voltage control scheme and slip power control scheme are among them. In the paper, the digital simulation of input voltage control scheme and slip power control scheme using rotor resistance method has been used for performance analysis of GWRIG. A digital simulation model of the GWRIG and its control system are developed with MATLAB Simulink. An optimum value of input voltage is obtained using simulation model such that maximum power is fed from wound rotor induction generator (WRIG) to power system or grid at a particular wind speed. Then the performance of the same WRIG is analyzed by slip power control scheme using rotor resistance method (at same wind speed). A series of studies on power flow from WRIG to power system or grid using input voltage control scheme and slip power control scheme are carried out with this model. Finally, the comparison of efficiency, power factor, stator current and power fed to grid under different wind speeds using both control strategy are discussed.