Protection fixed speed wind generators against symmetrical and unsymmetrical voltage sag by DVR based on Vector control

The increasing wind power integration with power grid has forced situation to protection of wind generators against symmetric and asymmetric voltage sag for stable operation. One important problem with induction generator based wind farm is its low ride through capability to the grid voltage disturbance. Any disturbance such as voltage sag may cause wind farm outages. Since wind power contribution is in predominant percentage, such outages may lead to stability problem. The proposed strategy is to use Dynamic Voltage Restorer (DVR) to compensate the voltage disturbance. The DVR provides the wind generator the ability to remain connected in grid and improve the reliability. Extensive simulation results are included to illustrate the control and operation of DVR

Dynamic voltage Restorer; power grid; Voltage sag; Vector control; Wind generatort