针对电力系统的强非线性和不确定性的特点，直接对其非线性不确定对象设计了非线性状态PI励磁汽门协调控制器。
As for the strong nonlinear and uncertain characteristic of the power system, the nonlinear state PI coordinated controller of excitation and valve is proposed in this paper.
实验结果证明，这一控制器跟踪精度高，并且对系统的非线性和不确定性表现出很强的鲁棒性。
The experimental results demonstrate that this nonlinear controller is of fine robustness and a high degree of tracking accuracy.
系统包含状态时滞、控制输入时滞、参数不确定性和未知的非线性扰动。
The system under consideration involves state time delay, control input time delay, parameter uncertainties and unknown nonlinear disturbances.
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