励磁输入动态不确定的同步发电机鲁棒控制

Excitation Control of Generator with Input Unmodeled Dynamics

非线性励磁控制如果没有考虑励磁输入存在的不确定性,可能影响其实际的控制效果。为了减小励磁输入动态不确定对发电机系统的影响,利用积分反推方法设计名义系统的虚控制,并加入非线性动态阻尼项对虚控制进行再设计,得到系统的鲁棒非线性控制率。控制率的设计未采用任何线性化方法,充分利用了系统的非线性特性。通过仿真试验,证实了该方法在输入动态不确定子系统满足最小相位、相对阶为零的条件下,可以保证发电机的功角、输出电压稳定。

The problem of input unmodeled dynamics in the excitation control of generator is considered. Within the redesign of virtual control of nominal system, LgV-backstepping techniques is used. The robust nonlinear control law is proposed to make the power angle and terminal voltage of generator stable. Since the controller design is based on the nonlinear system without any linearization, and the nonlinear characteristics of the system are sufficiently utilized, it is more potent in application. Simulations show the effectiveness of the proposed control law when the input unmodeled dynamics are minimum phase and relative degree zero.