Facts based fault tolerant control schemes for wind energy conversion systems

Abstract

The technology of power system utilities around the world has rapidly evolved with considerable changes along with improvements in power system structures and operation. The ongoing expansions and growth in the technology, demand more optimal and profitable operation of a power system with respect to generation, transmission and distribution systems. An electric power system consists of large complex network having more numbers of generator, transformer, transmission line and different types of load such as linear load and non-linear load. Nowadays power systems are much more loaded than before. This causes power systems to be operated near to stability limits. Therefore, it is very difficult to frame new generation plant and transmission system due to environment and energy problem. Hence, it is very necessary to increase the power flow ability to perform the actual transmission line instead of constructing new line. Doubly Fed Induction Generator (DFIG) based wind energy conversion systems are employed in the research for generating three phase AC supply. The major components of typical wind energy conversion system include a wind turbine, a generator and control system. At the present time and for the near future, generators for wind turbines will be synchronous generators and induction generator, including the squirrel-cage type and wound rotor type. For small to medium power wind turbines, doubly fed induction generators are often used because of their reliability and cost advantages. Power quality is an issue that is becoming increasingly important to electricity consumers at all levels of usage. Sensitive equipment and non-linear loads are common place in both the industrial and the domestic environment because of this a heightened awareness of power quality is developing. newline