According to a complete high-order nonlinear mathematical model(boiler

turbine and generator model)of the power generation unit system with parameter uncertainties

a self-adaptive robust controller was designed based on backstepping dynamic surface control method.A virtual controller and one-order low-pass filter were introduced in backstepping design procedure

to avoid complexity of the algorithm caused by many times differentiation of the nonlinear model

which simplifies the design.Theoretical analysis and simulation results show that

the controller can ensure the semi-global asymptotical stability of the closed-loop system.For the system's parameter uncertainty

this controuer has strong robustness and can ensure stable operation when the system is out of order.