Real-Time Flow Control of Blade Section Using a Hydraulic Transmission System Based on an H-Inf Controller with LMI Design

Tingrui Liu, Kang Zhao, Changle Sun, Jiahao Jia and Guifang Liu
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Tingrui Liu: College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Kang Zhao: College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Changle Sun: College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Jiahao Jia: College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Guifang Liu: College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, China

Energies, 2020, vol. 13, issue 19, 1-16

Abstract: Vibration and real-time flow control of the 2D blade section of wind turbines with three degrees of freedom (3-DOF), excited by external pitch motion, are investigated based on an H-inf (H ∞ ) controller using linear-matrix-inequality (HIC/LMI) design. The real-time flow control for the purpose of aeroelastic flutter suppression includes not only the driving process of real-time physical equipment, but also the realization of real-time control algorithm in the physical controller. The aeroelastic system combined with pitch motion is controlled by a kind of HIC/LMI algorithm. The real-time external pitch motion is driven by rack-piston cylinder (RPC) using a hydraulic transmission system (HTS). The unsteady aerodynamic loads model is simplified by the HTS system. The HTS is actuated by a proportional-flow valve (PFV) which is controlled by another HIC/LMI algorithm, a novel algorithm for waveform tracking. According to the result of waveform tracking, the input current signal of PFV is realized by the configuration of the controller hardware system and its external circuits. In two types of HIC/LMI algorithms, controller stabilities are affirmed using Lyapunov analyses, and controller values are derived and obtained by using LMI designs. Flutter suppression for divergent and instable displacements is shown, with obvious controlled effects illustrated. An online monitoring experimental platform using hardware-in-the-loop simulation, based on Siemens S7-200 programmable logic controller (PLC) hardware and Kingview detection system, is built to implement pitch motion based on HTS and configure the signal input of PFV in pitch control.

Keywords: real-time flow control; aerodynamic load; flutter suppression; H ∞ controller; linear matrix inequality; pitch control; hydraulic transmission system; hardware-in-the-loop simulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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