Influences of Power Electronics Converters on Current-Voltage behaviors during faults in DGUs-Part I: Wind energy Conversion Systems

Abstract

The growing interest in clean and sustainable electric energy push toward increasing the interconnection of wind energy conversion systems (WECS) to utility grids. Designs of the majority of WECSs employ power electronic converters (PECs), which generally have non-linear and switched characteristics. The characteristics, operation, and control of PECs in WECSs can result in non-conventional voltage-current behaviors during faults. This paper investigates the voltage-current behaviors during faults that occur in grid-connected WECSs. Two types of WECSs are considered in this paper, which are the doubly-fed induction generators (DFIGs) and permanent magnet generator (PMGs) based WECSs. The voltage-current behaviors are investigated in experimentations for different faults occurring in different parts of the test grid-connected WECSs.