Enhancement of DFIG Operation Using a STATCOM Under a Voltage Grid Faults

Abstract

Wind farms will need to continue to provide voltage and frequency stability to the grid even during periods of disturbance or faults. Particular attention has been paid to the maintenance of production under disturbed conditions (fault ride-through capability LVRT) and grid support capability. The maintenance of the production in disturbed regime is possible by the design and the dimensioning of controllers able to maintain the connection to the grid and that in the presence of network defects. Control of reactive energy in the grid using flexible alternative current transmission systems (FACTs) can improve the transient and permanent stability of the later. This paper deals with the behavior of a double-fed induction generator (DFIG) under asymmetric voltage faults. A static compensator (STATCOM) is connected to the common coupling point (PCC) and serves as a reactive support to regulate the mains voltage and keep the DFIG connected. The different converters used in this paper are controlled by the oriented voltage control strategy (VOC) decomposed in positive and negative sequences. Simulation results under MATLAB/SIMULINK environment are introduced to show the validity and efficiency of the control strategy.