Nonlinear adaptive backstepping integrated control for thermal-power-generation units
XI Yan-na
WANG Yin-song
Abstract：For the complete model (boiler-turbine-generator model) of a thermal power generation unit considering both external disturbances and parameter uncertainties,a new nonlinear integrated control strategy is proposed based on adaptive backstepping method and coordinated passivity theory. At first,the steam-valving controller is obtained by using backstepping method for the controlled object subsystems after preprocessing. Then,the excitation part is optimized by taking the high side voltage as the control target. At last,a stepwise recursive design of the fuel controller is presented. In the control law design process,parameter update laws are designed by using sufficiently smooth projection operators to conquer the effect of parameter uncertainties and avoid the possibly parameter-drift. At the same time,the nonlinear-damping is added in control laws to effectively inhibit the impact of external disturbance on the control quality.The results of simulation analysis and a load-changing experiment show that the proposed nonlinear integrated control system has strong positive impact on the performance of active and reactive power of the unit. It has satisfactory performance in load tracking,disturbance rejection and robustness to model uncertain parameters.
Keywords：boiler-turbine-generator unitsnonlinear controladaptive backstepping methodcoordinated passivitysufficiently smooth projection operator
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：14( 184-197 )