Journal
RENEWABLE ENERGY
Volume 128, Issue -, Pages 108-124Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2018.05.047
Keywords
Ancillary services; Doubly-fed induction generator; Fast-frequency response; Primary frequency control; Wind power integration; Wind power smoothing
Funding
- Secretaria de Educacion Superior, Ciencia, Tecnologia e Innovacion (SENESCYT), Government of the Republic of Ecuador [2015-AR6C5141]
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This paper presents a new approach to address the issue of the frequency deviations induced by the fluctuating power injected into the grid by doubly-fed induction generator based wind turbines in a weak or isolated power system that is based in a frequency dependent smoothing of the wind power. An algorithm that allows an improved maximum power point tracking curve shifting as a function of the blade pitch angle variation has been proposed, taking advantage of the combined effect of two frequency control strategies: one based on the use of the stored kinetic energy by means of the concept of virtual inertia, and the other, by limiting the captured wind power through blade pitch angle regulation. This algorithm has been devised to reduce the turbine deload requirements, and at the same time, to increase the available kinetic energy in the turbine. This results in a more effective fast-frequency response with a lower amount of non-dispatched wind energy. The effectiveness of the proposed method is assessed by considering a real wind profile in time-domain simulations. (C) 2018 Elsevier Ltd. All rights reserved.
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