非线性状态PI励磁控制器

利用扩张状态观测将原来的非线性系统变换成线性系统，然后用状态PI控制器的设计思想设计了非线性状态PI控制器；并将其用于发民机励磁控制，以及解决电力系统的强非线性和不确定性问题，避免了反馈线性化非线性励磁控制由于数学模型的误差而影响控制器性能的特点。所得控制规律与系统运行点和网络结构完全无关，同时控制器结构简单。仿真计算表明，非线性状态PI励磁控制器对系统运行点和网络结构变化具有良好的适应能力，可以有效地改善系统的稳定性。

A NONLINEAR STATE PI EXCITATION CONTROLLER

The paper proposes a nonlinear state PI excitation controller to deal with the highly nonlinear and uncertain characteristics of the power system.The controller design is undertaken directly based on the uncertain system and it avoids the shortcoming of feedback linearization excitation controller in which the control performance is affected by the error of the mathem atical m odel. The control law is com pletely independent of the power system operation condition and disturbances. The controller structure is simple. The simulation results show that the nonlinear state PI excitation controller has excellent perform ance and robustness.It is able to im prove power system stability.