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- Title
Universal finite‐time observer design and adaptive frequency regulation of hydraulic turbine systems.
- Authors
Liu, Yijian; Lan, Qixun; Qian, Chunjiang; Qian, Weixing; Chu, Hongyan
- Abstract
In this study, the authors consider the problem of frequency regulation via output feedback for a hydraulic turbine system under unknown load variations. First, to address the difficulties in estimating the unmeasurable states and the unknown load variation, they introduce a universal finite‐time observer (UFTO) which can estimate unmeasurable states, unknown parameters and disturbances under a unified framework. Based on the proposed UFTO, the unmeasurable wicket gate position, the flow rate and the load variation are estimated in a finite time for the hydraulic turbine system. Then by introducing a coordinate transformation, the state‐space model of hydraulic turbine system is converted into a simple form for which a state feedback control law is constructed using the adding a power integrator approach. Combining the UFTO with the finite‐time control law, an output feedback controller is designed to regulate the frequency of the hydraulic turbine system. Computer simulations are also given to validate the proposed finite‐time output feedback controller.
- Publication
IET Control Theory & Applications (Wiley-Blackwell), 2016, Vol 10, Issue 3, p363
- ISSN
1751-8644
- Publication type
Article
- DOI
10.1049/iet-cta.2015.0310