Bivariate grid-connection speed control of hydraulic wind turbines |
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| Authors: | Chao Ai Wei Gao Lijuan Chen Jiawei Guo Xiangdong Kong Andrew Plummer |
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| Institution: | 1. School of mechanical engineering, Yanshan University, Qinhuangdao 066004, China;2. Department of Mechanical Engineering, University of Bath, Bath BA2 7AY, United Kingdom;3. Nanjing Institute of Technology, Nanjing 211167, China;1. Fujian Provincial Key Laboratory of Information Processing and Intelligent Control, Minjiang University, Fuzhou 350108, China;2. Digital Fujian IoT Laboratory of Intelligent Production, Minjiang University, Fuzhou 350108, China;3. School of Computing, Engineering and Mathematics, Western Sydney University, Australia;4. Department of Electrical Engineering and Innovation Center for Big Data and Digital Convergence, Yuan Ze University, Taoyuan 320, Taiwan;5. School of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China;1. College of Information Science and Engineering, Northeastern University, Liaoning, China;2. State Key Laboratory of Synthetical Automation for Process Industries, Northeastern University, Shenyang 110819, PR China;1. School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, PR China;2. School of Information Science and Engineering, Chengdu University, Chengdu 610106, PR China;1. Electrical Engineering, Khalifa University of Science and Technology, Sas Al Nakhl, Abu Dhabi, United Arab Emirates;2. Saint-Petersburg State University, Saint-Petersburg, Russia;3. Institute for Problems in Mechanical Engineering of the Russian Academy of Sciences (IPME RAS), St.Petersburg, Russia;4. University of Jyväskylä, Jyväskylä, Finland |
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| Abstract: | The requirement for An electrical grid-connected wind turbine is that the synchronous generator speed is stable within a required speed range for the electrical grid. In this paper, a hydraulic wind turbine (HWT) system is considered, and the working principle and working conditions of the HWT are introduced. A novel speed control method is proposed in this paper, using both a proportional flow control valve and a variable displacement motor, which are adjusted in combination to control the speed of the HWT. By establishing a state space model of the HWT and solving the nonlinear system with a feedback linearization method, a bivariate tracking controller is constructed to realize accurate speed control under fluctuating wind speed and the load disturbance conditions. The effectiveness of the control method is verified by simulation, but experimental results highlight problems with the method. The theoretical controller is simplified to reduce sensitivity to measurement noise and modeling error. The control effect has been improved to some extent, but it is limited. Based on these results, combined with the sliding mode variable structure control method and the feedback linearization method to solve the problem of measurement noise and modeling error, and the effectiveness of the control law is finally verified experimentally. It lays a theoretical foundation for the practical application of HWT. |
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