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access icon free Fault ride-through enhancement in DFIG with control of stator flux using minimised series voltage compensator

© The Institution of Engineering and Technology
Received 30/11/2017, Accepted 08/04/2018, Revised 16/03/2018, Published 10/04/2018

Wind energy systems based on doubly fed induction generators (DFIG) are very sensitive to grid disturbances, mainly voltage sags, which can cause rotor and stator overcurrents and rotor overvoltage, resulting in turbines shutdown or even damage to the converter connected to the rotor. Besides, the transmission system operators have been issuing strict grid codes, which require the wind energy conversion system (WECS) to keep operating during grid disturbances and supplying reactive power to the system, if necessary. Due to difficulties to access the offshore DFIGs, avoiding damages and shutdowns in these WECS is paramount. In order to overcome this problem, this article proposes the control of the generator stator flux through a series voltage compensator (SVC) with minimised components. The proposed SVC draws power from the grid through a transformer with a single turn in the primary side (single turn primary transformer) and injects power in the system through an LC filter, without any series transformer. The control of the generator stator flux reduces considerably the stator and rotor current as well as the rotor voltage, allowing the generator to ride-through the grid disturbances.

Inspec keywords: power generation control; rotors; stators; power generation faults; power grids; asynchronous generators; power supply quality; wind power plants

Other keywords: SVC; strict grid codes; stator overcurrents; doubly fed induction generators; single turn primary transformer; grid disturbances; turbines shutdown; supplying reactive power; rotor voltage; DFIG; generator stator flux; shutdowns; rotor overvoltage; transmission system operators; series transformer; damages; minimised series voltage compensator; WECS; offshore DFIGs; minimised components; wind energy systems; wind energy conversion system; voltage sags

Subjects: Power convertors and power supplies to apparatus; Asynchronous machines; Wind power plants; Control of electric power systems

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