Application of nonlinear decoupling method based on unscented Kalman filter in thermal power units
WANG Yonggang1, SUN Yumiao1, ZHANG Nannan1, XIAO Ruimin1, ZHANG Mingjian2
1. School of Information and Electrical Engineering, Shenyang Agricultural University, Shenyang 110866; 2. State Grid Liaoning Maintenance Company, Shenyang 110003
Abstract：In view of the strong coupling, strong nonlinearity and parameter uncertainty of thermal power units, it is difficult to use conventional control methods to effectively control them. This article first analyzes the influence of the system's nonlinear strength and the system's model parameter uncertainty on the system. On the basis of in-depth understanding of the dynamic characteristics of the system, the system parameters are estimated by the unscented Kalman filter (UKF) method. The above system is controlled by global linearized control (GLC) strategy. The simulation results show that the UKF method can quickly and effectively estimate the uncertain parameters of this model. In this paper, compared with the feedback linearization control method, the GLC control method could improve the control performance of the system. This model has strong robustness and could provide technical support and theoretical guidance for actual production.
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2021, Vol. 22 
