@Article{ee.2022.018555,
AUTHOR = {Quanchun Yan, Chao Yuan, Wen Gu, Yanan Liu, Yiming Tang},
TITLE = {Coordinated Rotor-Side Control Strategy for Doubly-Fed Wind Turbine under Symmetrical and Asymmetrical Grid Faults},
JOURNAL = {Energy Engineering},
VOLUME = {120},
YEAR = {2023},
NUMBER = {1},
PAGES = {49--68},
URL = {http://www.techscience.com/energy/v120n1/50132},
ISSN = {1546-0118},
ABSTRACT = {In order to solve the problems of rotor overvoltage, overcurrent and DC side voltage rise caused by grid voltage
drops, a coordinated control strategy based on symmetrical and asymmetrical low voltage ride through of rotor
side converter of the doubly-fed generator is proposed. When the power grid voltage drops symmetrically, the
generator approximate equation under steady-state conditions is no longer applicable. Considering the dynamic
process of stator current excitation, according to the change of stator flux and the depth of voltage drop, the system
can dynamically provide reactive power support for parallel nodes and suppress the rise of DC side voltage and
rotor over-current. When the grid voltage drops asymmetrically, the positive and negative sequence components
are separated in the rotating coordinate system. The doubly fed generator model is established to suppress the rotor
positive sequence current and negative sequence current respectively. At the same time, the output voltage limit of
the converter is discussed, and the reference value is adjusted within the allowable output voltage range. In order to
adapt to the occurrence of different types of power grid faults and complex operating conditions, a fast switching
module of fault type detection and rotor control mode is designed to detect the type of power grid faults and voltage
drop depth in real time and switch the rotor side control mode dynamically. Finally, the simulation model of the
doubly fed wind turbine is constructed in Matlab/Simulink. The simulation results verify that the proposed control
strategy can improve the low-voltage ride through performance of the system when dealing with the symmetrical
and asymmetric voltage drop of the power grid and identify the power grid fault type and provide the correct control
strategy.},
DOI = {10.32604/ee.2022.018555}
}