Abstract
This paper analyses the repercussions from the connection of Wind Parks on the operation of weak electricity distribution systems, based on simulation results. Three different cases concerning Fixed Speed Wind Turbines are studied. Also Variable Speed Wind Turbines are examined, using (i), doubly-fed induction machines, and (ii), a dual voltage-source converter cascade. All these types of wind turbines are assumed to be equipped with asynchronous machines. The effects on the voltage profile caused by both Fixed and Variable Speed Wind Turbines are compared. The advantages of the variable speed operation are confirmed. The possible increase in the installed capacity of a Wind Park with variable speed turbines, as compared with fixed speed turbines maintaining the same power quality standards, is estimated. The distribution system studied is an actual feeder located in a rural area at the southeast of mainland Greece. This area presents excellent wind potential and as a result independent power producers have expressed a considerable interest for the installation of Wind Parks.