PROJECT TITLE :

Response of wind power park modules in distribution systems to transmission network faults during reverse power flows

ABSTRACT:

Penetration levels of distributed wind power park modules (WPPMs) reach such high levels in elements of the planet, for example, Germany, that reverse power flows (RPFs) from distribution to transmission level occur often in bound areas of the power system. This study compares the impact of traditional and RPFs on the network fault response of WPPMs in distribution systems that are liable to fault-induced delayed voltage recovery problems for a fault within the transmission system. The study contributes to the ongoing discussion on grid association needs for WPPMs and raises awareness of a prolonged low-voltage ride-through (LVRT) operation of WPPMs when these are set to ride-through faults in 'blocking mode’, during that the set-points for the active and reactive currents are set to zero. For RPFs such LVRT operation causes a considerable sustained active power deficit in power system areas with high penetration of distributed WPPMs and probably ends up in a stability risk.