ANALYSIS OF INDUCTION MACHINE VARIABLE SPEED WIND POWER GENERATION

Abstract

Among the renewable sources of energy available today for generation of electrical power, wind energy stands foremost mainly because it is considered to be nonpolluting and economically viable. Design and successful operation of wind energy conversion systems (WECs) is a very complex task involving many interdisciplinary skills, e.g., civil, mechanical, electrical. and electronics, geography, aerospace, environmental etc. Performance of WECs depends upon subsystems like wind turbine (aerodynamic), gears (mechanical), generator and converters (electrical); whereas the availability of wind resources are governed by the climatic conditions of the region concerned for which wind survey is extremely important to exploit wind energy. In this dissertation, grid connected doubly fed Induction Generator (DFIG) for variable speed wind power generation is described. Line voltage Oriented vector control approach is deployed for both stator- and rotor-side converters to provide independent control of active and reactive power and keep the DC-link voltage constant. To extract maximum energy from the wind, a look-up table is prepared from the wind turbine power speed characteristics curve. The complete simulation model is developed in matlab/simulink. iii