access icon free Speed recovery strategy for the inertia response control of DFIGs: extended state observer based approach

© The Institution of Engineering and Technology
Received 30/04/2016, Accepted 09/09/2016, Revised 24/08/2016, Published 26/09/2016

The inertia response control (IRC) of doubly-fed induction generators is capable of providing the power system with controlled inertia by releasing mechanical power to or absorbing electrical power from the system when the system frequency experiences sudden changes. However, it will result in deviation of the rotor speed from the optimal working point and unexpectedly reduce the captured wind power. To restore the rotor speed as quickly after an IRC action as possible, in this study, the authors derive a novel rotor speed recovery strategy based on the extended state observer (ESO) technique. They first develop two ESOs to accurately estimate the captured wind power by the wind turbine and the system unbalance power, respectively. They then synthesise the rotor speed recovery strategy based on such estimates, including the optimal recovery timing and the control modes as well as the associated switching logics. Detailed simulations carried on PSCAD/EMTDC show that the authors’ controller outperforms the traditional proportional–integral controller in the aspects of dynamical performance, the robustness to varying working conditions and the capability to prevent the system frequency from a second drop.

Inspec keywords: machine control; asynchronous generators; wind turbines; rotors

Other keywords: optimal working point; DFIG; mechanical power; doubly-fed induction generators; wind turbine; electrical power; optimal recovery timing; PSCAD-EMTDC; inertia response control; system unbalance power; associated switching logics; captured wind power; rotor speed recovery strategy; extended state observer based approach

Subjects: Asynchronous machines; Wind power plants; Control of electric power systems

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