access icon free Post-retirement utilisation of synchronous generators to enhance security performances in a wind dominated power system

Power system security concerns due to significant wind generation could be twofold: first, the frequency response and second, the short-circuit performance. Continuous development of wind energy may cause economic replacement and retirement of existing synchronous generators. Modern wind turbine generators do not inherently offer inertia and governor response after a disturbance, which may result in declining frequency response behaviour. Besides, they have limited fault current contribution, which may cause unacceptable short-circuit ratio at the grid connection point of those wind power plants. Traditionally, frequency response and short-circuit performance are individually improved. However, both of them are concurrently affected by high wind penetration. Hence, a common approach to simultaneously enhance both indices is essential. Therefore, this study introduces an idea of operating some of the retired synchronous generators in the synchronous condenser mode, which is termed as ‘post-retirement scheme (PRS)’. Such a second use of the retired synchronous generators can jointly upgrade frequency response and short-circuit strength during high wind generation. This study also proposes a methodology to evaluate when and how much PRS should be deployed for ensuring an adequate security performance in a wind dominated power system.

Inspec keywords: synchronous generators; wind power plants; power system security; wind turbines

Other keywords: frequency response behaviour; wind dominated power system; fault current; retired synchronous generators; wind power plants; post-retirement utilisation; unacceptable short-circuit ratio; short-circuit strength; synchronous condenser mode; grid connection point; wind turbine generators

Subjects: Power system protection; Synchronous machines; Wind power plants

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http://iet.metastore.ingenta.com/content/journals/10.1049/iet-gtd.2016.0267
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