Model-free control of wind farms: A comparative study between individual and coordinated extremum seeking

RENEWABLE ENERGY

卷:113

Article

Ciri, Umberto¹  Rotea, Mario A.¹  Leonardi, Stefano¹ 

[1] Univ Texas Dallas, Dept Mech Engn, 800 W Campbell Rd, Richardson, TX 75080 USA

关键词: Wind farm control;    Optimization;    Extremum seeking control;    Dynamic programming;    Large eddy simulations;   

DOI  :  10.1016/j.renene.2017.06.065

来源: Elsevier

【 摘 要 】

Large Eddy Simulations of the turbulent flow over an array of wind turbines have been performed to evaluate a model-free approach to power optimization. Two different implementations have been tested: (i) individual extremum-seeking control (IESC), which optimizes the power of the single turbines individually; (ii) nested ESC (NESC), which coordinates the single controllers to seek a farm-level optimum. Both schemes provide a gain over the baseline, which operates all the turbines with ideal design set points. These settings are found to be sub-optimal for waked turbines. The NESC provides a slightly larger power production than the independent ESC, albeit it has a slower convergence to the optimum. Therefore, depending on wind variability, both strategies may be employed. IESC is more appropriate for sites with wind conditions changing on a short time scale, while NESC should be preferred when the wind conditions are quite stable. Since the extremum-seeking algorithm is model-free, uncertainties in atmospheric conditions, aging of the turbine or numerical dissipation due to the sub-grid model should not change the general conclusions reached in this paper. This methodology can provide reliable results and permits to gain, through the analysis, a useful knowledge on the mechanisms leading to the performance enhancement. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

Free