access icon free Short-circuit current reduction techniques of the doubly-fed induction generator based wind turbines for fault ride through enhancement

© The Institution of Engineering and Technology
Received 12/05/2016, Accepted 05/04/2017, Revised 12/02/2017, Published 11/04/2017

Grid voltage disturbances result in high magnitudes of rotor currents and DC-link voltage of the doubly-fed induction generator based wind turbines (DFIG-WTs), which may lead under severe fault conditions into deactivation of the machine side converter (MSC) and violation of the fault ride through (FRT) requirements of the grid codes. In this essence, several solutions were proposed, which vary between installing extra hardware components and control modification. However, the extra costs as well as the control limitations degrade the feasibility of the proposed solutions. In this study, new techniques are proposed to enhance the FRT through peak short-circuit current reduction of the DFIG-WT. The new techniques are developed based on the open-loop and close-loop dynamic response of the DFIG. The new techniques utilise the available MSC voltage, in order not to violate the voltage limits, to increase the rate of change of the DFIG internal transient voltage and to increase the magnitude of the transient impedance. Additionally, the mean variance mapping optimisation is used to optimally tune the gains in the second two techniques. The new techniques were implemented in a manufacturer-based simulation model, and the simulation results show their effectiveness, where the maximum peak current reduction achieved was 23.6%.

Inspec keywords: power generation faults; wind power plants; power convertors; power grids; asynchronous generators; optimisation; dynamic response; wind turbines; rotors; power system transients; short-circuit currents

Other keywords: fault ride through enhancement; machine side converter; rotor current magnitude; DFIG-WTs; mean variance mapping optimisation; DFIG internal transient voltage; grid codes; transient impedance magnitude; short-circuit current reduction techniques; close-loop dynamic response; MSC; manufacturer-based simulation model; doubly-fed induction generator based wind turbines; open-loop dynamic response; FRT; grid voltage disturbances

Subjects: Asynchronous machines; Wind power plants; Optimisation techniques; Power convertors and power supplies to apparatus

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