Global real-time optimization by output-feedback extremum-seeking control with sliding modes

2012 ◽  
Vol 349 (4) ◽  
pp. 1397-1415 ◽  
Author(s):  
Tiago Roux Oliveira ◽  
Alessandro Jacoud Peixoto ◽  
Liu Hsu
Keyword(s):  
Real Time ◽  
Output Feedback ◽  
Extremum Seeking ◽  
Sliding Modes ◽  
Extremum Seeking Control ◽  
Time Optimization ◽  
Real Time Optimization

Real-Time Optimization of Wind Farm Energy Capture With Delay Compensated Nested-Loop Extremum Seeking Control

2017 ◽  
Author(s):  
Zhongyou Wu ◽  
Yaoyu Li
Keyword(s):  
Wind Turbine ◽  
Real Time ◽  
Wind Farm ◽  
Optimization Techniques ◽  
Extremum Seeking ◽  
Extremum Seeking Control ◽  
Energy Capture ◽  
Time Optimization ◽  
Real Time Optimization ◽  
Nested Loop

Real-time optimization of wind farm energy capture for below rated wind speed is critical for reducing the levelized cost of energy (LCOE). Performance of model based control and optimization techniques can be significantly limited by the difficulty in obtaining accurate turbine and farm models in field operation, as well as the prohibitive cost for accurate wind measurements. The Nested-Loop Extremum Seeking Control (NLESC), recently proposed as a model free method has demonstrated its great potential in wind farm energy capture optimization. However, a major limitation of previous work is the slow convergence, for which a primary cause is the low dither frequencies used by upwind turbines, primarily due to wake propagation delay through the turbine array. In this study, NLESC is enhanced with the predictor based delay compensation proposed by Oliveira and Krstic [1], which allows the use of higher dither frequencies for upwind turbines. The convergence speed can thus be improved, increasing the energy capture consequently. Simulation study is performed for a cascaded three-turbine array using the SimWindFarm platform. Simulation results show the improved energy capture of the wind turbine array under smooth and turbulent wind conditions, even up to 10% turbulence intensity. The impact of the proposed optimization methods on the fatigue loads of wind turbine structures is also evaluated.

Real-time optimization of a chilled water plant with parallel chillers based on extremum seeking control

2017 ◽  
Vol 208 ◽  
pp. 766-781 ◽  
Author(s):  
Baojie Mu ◽  
Yaoyu Li ◽  
John M. House ◽  
Timothy I. Salsbury
Keyword(s):  
Real Time ◽  
Extremum Seeking ◽  
Extremum Seeking Control ◽  
Time Optimization ◽  
Water Plant ◽  
Chilled Water ◽  
Real Time Optimization
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