TY - JOUR
T1 - Modified demagnetisation control strateglow-voltage ride-through enhancement in dfig-based wind systems
AU - Senapati, Manoj Kumar
AU - Pradhan, Chittaranjan
AU - Nayak, Paresh Kumar
AU - Padmanaban, Sanjeevikumar
AU - Gjengedal, Terje
N1 - Funding Information:
The authors are very grateful to the Arctic Centre for Sustainable Energy (ARC), UiT The Arctic University of Norway, Norway for providing an environment to do this research.
Publisher Copyright:
© The Institution of Engineering and Technology 2020.
PY - 2020/12/14
Y1 - 2020/12/14
N2 - The large-scale wind energy conversion systems (WECSs) based on doubly-fed induction generators (DFIGs) are very popular in recent years due to the numerous technical and economic benefits. With the increasing penetration level of wind energy, the latest grid codes require the DFIG-based WECSs to remain connected to the grid under grid fault scenarios and deliver the required reactive power into the grid. However, the direct connection of the stator of the DFIG to the grid makes it prone to grid disturbances, especially to voltage sag. This study proposes a modified demagnetisation control strategy to enhance the low-voltage ride-through (LVRT) capability of the DFIG under grid faults. The proposed control strategy is implemented in a coordinated approach by using the existing demagnetisation control and the addition of an external resistance in the stator side of the DFIG. The demagnetisation control damps the direct current component of the stator flux and the external resistance accelerates the damping of the transient flux by decreasing the time constant and hence, enhancing the LVRT capability of DFIG. The effectiveness of the proposed control strategy is demonstrated under both symmetrical and asymmetrical grid faults simulated system through MATLAB/Simulink®. The comparative results justify the merits of the proposed methodology.
AB - The large-scale wind energy conversion systems (WECSs) based on doubly-fed induction generators (DFIGs) are very popular in recent years due to the numerous technical and economic benefits. With the increasing penetration level of wind energy, the latest grid codes require the DFIG-based WECSs to remain connected to the grid under grid fault scenarios and deliver the required reactive power into the grid. However, the direct connection of the stator of the DFIG to the grid makes it prone to grid disturbances, especially to voltage sag. This study proposes a modified demagnetisation control strategy to enhance the low-voltage ride-through (LVRT) capability of the DFIG under grid faults. The proposed control strategy is implemented in a coordinated approach by using the existing demagnetisation control and the addition of an external resistance in the stator side of the DFIG. The demagnetisation control damps the direct current component of the stator flux and the external resistance accelerates the damping of the transient flux by decreasing the time constant and hence, enhancing the LVRT capability of DFIG. The effectiveness of the proposed control strategy is demonstrated under both symmetrical and asymmetrical grid faults simulated system through MATLAB/Simulink®. The comparative results justify the merits of the proposed methodology.
UR - http://www.scopus.com/inward/record.url?scp=85103292084&partnerID=8YFLogxK
U2 - 10.1049/iet-rpg.2019.1128
DO - 10.1049/iet-rpg.2019.1128
M3 - Journal article
AN - SCOPUS:85103292084
SN - 1752-1416
VL - 14
SP - 3487
EP - 3499
JO - IET Renewable Power Generation
JF - IET Renewable Power Generation
IS - 17
ER -