| Abstract: |
| The Wind Energy Conversion System (WECS) based Doubly Fed Induction Generator (DFIG) has experienced a rapid
development in the world, which leads to an increasing insertion of this source of energy in the electrical grids. The
sudden and temporary drop of voltage at the network can affect the operation of the DFIG; the voltage dips
produce high peak currents on the stator and rotor circuits, without protection, the rotor side converter (RSC) will
suffer also from over-current limit, consequently, the RSC may even be destroyed and the generator be damaged.
In this paper a new Direct Power Control (DPC) method was developed, in order to control the stator powers and
help the operation of the aero-generator during the faults grid; by injecting the reactive power into the network to
contribute to the return of voltage, and set the active power to the optimum value to suppress the high peak
currents. The DPC method was designed using the nonlinear Backstepping (BS) controller associated with the
Lyapunov function to ensure the stability and robustness of the system. A comparison study was undertaken to
verify the robustness and effectiveness of the DPC-BS to that of the classical vector control (VC) using Proportional-
Integral (PI) correctors. All were simulated under the Simulink® software. |
| Key words: Wind energy, Doubly-fed induction aero-generator, Voltage dips, DPC strategy, Backstepping technique,Lyapunov function |
| DOI：10.1186/s41601-019-0148-y |
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| Fund: |
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