Performance Evaluation of Wind Energy Conversion Systems Employing Space Vector Controlled Doubly-Fed Induction Generators

摘要

Nowadays world is suffering with the problem of increasing demand for electric power and global warming caused by emissions from industries used to meet this power demand. In countries where per capita power consumption is minimum, there is requirement for continuous power capacity addition without affecting the environment. A wind energy conversion system (WECS) is perfect solution to those two problems. Variable speed wind energy conversion system is able to convert the varying incoming wind power as rotational energy, by changing the speed of the wind turbine. The doubly-fed induction generators (DFIG) are widely used in WECS using back to back converters. Indeed, amongst many variable speed concepts, WECS using DFIG have many advantages over others. It is essential to conduct fault studies in a power system consisting of distributed generation (DG), in particular if it consists of WECS connected to grid by a line. A fault occurring on this line severely effects the operation of back to back PWM converters and DFIG. In this paper simulation studies are carried out to identify the effects of instantaneous and gradual variation of wind speeds and various types of faults in line section on the operation of WECS employing space vector controlled DFIG.