Robustness of Model Predictive Control Algorithms for Systems with Hard Constraints

Author(s):  
Evaghelos Zafiriou
2018 ◽  
Vol 61 ◽  
pp. 77-102 ◽  
Author(s):  
M. Bahadır Saltık ◽  
Leyla Özkan ◽  
Jobert H.A. Ludlage ◽  
Siep Weiland ◽  
Paul M.J. Van den Hof

2018 ◽  
Vol 51 (27) ◽  
pp. 174-179 ◽  
Author(s):  
Dimitri Boiroux ◽  
Vladimír Bátora ◽  
Zeinab Mahmoudi ◽  
John Bagterp Jørgensen

2017 ◽  
Vol 140 (3) ◽  
Author(s):  
Qian Zhong ◽  
Ronald W. Yeung

Model-predictive control (MPC) has shown its strong potential in maximizing energy extraction for wave-energy converters (WECs) while handling hard constraints. However, the computational demand is known to be a primary concern for applying MPC in real time. In this work, we develop a cost function in which a penalty term on the slew rate of the machinery force is introduced and used to ensure the convexity of the cost function. Constraints on states and the input are incorporated. Such a constrained optimization problem is cast into a Quadratic Programming (QP) form and efficiently solved by a standard QP solver. The current MPC is found to have good energy-capture capability in both regular and irregular wave conditions, and is able to broaden favorably the bandwidth for capturing wave energy compared to other controllers in the literature. Reactive power required by the power-take-off (PTO) system is presented. The effects of the additional penalty term are discussed.


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