access icon free Enhanced fault ride through performance of self-excited induction generator-based wind park during unbalanced grid operation

© The Institution of Engineering and Technology
Received 25/09/2012, Accepted 03/05/2013, Revised 13/03/2013, Published

This study presents novel control design for improving the performance of large-scale wind park (LSWP) based on self-excited induction generator under unbalanced voltage conditions. A dual controller for static synchronous compensator (STATCOM) employing controller by employing positive- and negative-sequence synchronous frames is implemented and analysed in response to severely unbalanced voltage conditions. The test system simulated represents a wind park rated at 100 MW connected to a weak electrical grid. The potential of the dual STATCOM controller is evaluated and analysed for severely unbalanced voltage conditions at the grid interface of LSWP. The dual controller with STATCOM overloading capability is tested and compared with the performance of the positive-sequence controller in response to different types of asymmetrical grid faults at low short-circuit ratios. The simulations performed using PSCAD/EMTDC demonstrate superior performance of dual STATCOM control strategy for improving unbalanced operation, fault ride through capability and transient stability margin in response to severely unbalanced voltage conditions.

Inspec keywords: power generation faults; power grids; asynchronous generators; static VAr compensators; wind power plants; power system transient stability; control system synthesis

Other keywords: large-scale wind park; electrical grid; unbalanced grid operation; STATCOM controller; asymmetrical grid fault; transient stability margin; self excited induction generator; synchronous frame; unbalanced voltage condition; static compensator; power 100 MW; fault ride through performance enhancement; LSWP; grid interface

Subjects: Power system management, operation and economics; Wind power plants; Control system analysis and synthesis methods; Other power apparatus and electric machines; Stability in control theory; Control of electric power systems; Asynchronous machines; Power system control

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