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access icon openaccess Sub-synchronous resonance mitigation by a STATCOM in doubly fed induction generator-based wind farm connected to a series-compensated transmission network

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 22/08/2018, Accepted 17/09/2018, Published 22/10/2018

With the fast development of wind power generation, large-scale wind farms are connected to an electrical network which is series compensated to increase transmission capacity. However, a series-compensated power system may encounter with a sub-synchronous resonance (SSR) problem. Flexible AC transmission systems controllers are widely applied to mitigate SSR and improve the transient stability of the power system. A static synchronous compensator (STATCOM) with an SSR damping controller is proposed to mitigate the potential of SSR in a series-compensated doubly fed induction generator-based wind farm. The local signal is used as the input of the damping controller, which is feasible to be implemented in a practical project. Taking account of different series compensation levels and operating conditions, extensive transient simulations have been carried out using power systems computer aided design/electromagnetic transients including DC (PSCAD/EMTDC) to demonstrate the capability of STATCOM in damping SSR. It is shown that the SSR is successfully alleviated by STATCOM, which also verifies the effectiveness of the proposed STATCOM controller in improving the stability of the transmission system.

Inspec keywords: wind power plants; power generation control; damping; flexible AC transmission systems; time-domain analysis; subsynchronous resonance; power system transient stability; power system stability; static VAr compensators; asynchronous generators

Other keywords: fast development; large-scale wind farms; SSR damping controller; STATCOM controller; wind power generation; series-compensated transmission network; transient stability; transmission capacity; series-compensated power system; different series compensation levels; sub-synchronous resonance mitigation; electrical network; transmission system; sub-synchronous resonance problem; static synchronous compensator; flexible AC transmission systems controllers; operating conditions; extensive transient simulations; doubly fed induction generator-based wind farm

Subjects: Power system control; Control of electric power systems; Wind power plants; a.c. transmission; Other power apparatus and electric machines; Asynchronous machines

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