Power flow control and damping enhancement of a large wind farm using a superconducting magnetic energy storage unit

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Power flow control and damping enhancement of a large wind farm using a superconducting magnetic energy storage unit

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A novel scheme using a superconducting magnetic energy storage (SMES) unit to perform both power flow control and damping enhancement of a large wind farm (WF) feeding to a utility grid is presented. The studied WF consisting of forty 2 MW wind induction generators (IGs) is simulated by an equivalent 80 MW IG. A damping controller of the SMES unit is designed based on the modal control theory to contribute proper damping characteristics to the studied WF under different wind speeds. A frequency-domain approach based on a linearised system model using eigen techniques and a time-domain scheme based on a nonlinear system model subject to disturbance conditions are both employed to validate the effectiveness of the proposed SMES unit with the designed SMES damping controller. It can be concluded from the simulated results that the proposed SMES unit combined with the designed damping controller is very effective in stabilising the studied large WF under various wind speeds. The inherent fluctuations of the injected active power of the WF to the power grid can also be effectively controlled by the proposed control scheme.

Inspec keywords: load flow control; superconducting magnet energy storage; asynchronous generators; time-domain analysis; power grids; frequency-domain analysis; nonlinear control systems; linear systems; wind power plants

Other keywords: power 2 MW; utility grid; damping enhancement; power grid; modal control theory; nonlinear system model; superconducting magnetic energy storage unit; eigen techniques; frequency-domain approach; large wind farm; linear system model; wind induction generators; power 80 MW; time-domain scheme; power flow control

Subjects: Nonlinear control systems; Superconducting coils and magnets; Power system control; Other energy storage; Wind power plants; Asynchronous machines; Control of electric power systems

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