Dynamic Performance Estimation of DFIG Wind Turbine under
Balance /Unbalance Grid Fault Condition

Abstract

The global electrical energy consumption is rising and there is a steady increase in the demand of power generation. So, in addition to conventional power generation units a large no. of renewable energy units are being integrated into the power system. A wind electrical generation system is the most cost competitive, environmentally clean and safe out of all the renewable energy sources. The recent evolution of power semiconductors and variable frequency drive technology has aided the acceptance of variable speed generation systems.
Slip ring induction motor in the variable speed double fed induction generator mode is largely used in wind turbine generation technology. Therefore, a detailed model of induction generator is presented in the thesis. Then the induction generator is operated at different operating conditions and the results are presented in the thesis. A hardware set up is build up to estimate the different circuit parameter under different operating conditions. Speed, torque, Active and reactive power estimation are proposed in the thesis with the help of hardware set-up. Because these are the controllable parameter and they determine the machine performance. So, by estimating these parameter our future aim is to manipulate those parameter and to design a closed loop controller for DFIG. This study is relevant as DFIG-wind turbines are an integrated part of Distributed generation system. Any abnormalities associated with grid are going to affect the system performance considerably. Taking this into account, the performance of double fed induction generator (DFIG) variable speed wind turbine under network fault or under dynamic loading is studied. The significant result of the analysis is also shown and being compared with the existing literature to validate the approach.