一种高性能的非线性励磁控制

A HIGH PERFORMANCE NONLINEAR EXCITATION CONTROL FOR GENERATOR UNIT

考虑到在基于微分几何的非线性控制中,输出函数的选取会直接影响到变换后的线性空间的构成,从而影响到控制器的最终控制效果这一事实,该文提出了通过将输出函数选取为多状态变量组合形式的简便方法来解决非线性控制系统的动、静态性能的综合协调问题,从而有效地提高控制系统的整体综合性能;将此方法用于发电机的非线性励磁控制系统中,成功地找到了一种具有较高控制性能的非线性励磁控制律。仿真结果显示,该控制律既能很好地提高发电机端电压控制精度,又能有效地提高发电机组的运行稳定性,并表明所提出的控制器能有效地协调系统中各状态量的动、静态性能,具有较好的工业运用价值。

In the differential geometric based nonlinear control, selection of the output function of the nonlinear system will greatly affect the form of the linearized state space, and further affect the performance of the nonlinear controller. Taking this fact into account, this paper proposes a novel design method of nonlinear controller via selecting the output function as combination of the multiple state variables in order to coordinate the dynamic and the steady-state performances of various state variables of the system. Adopting this method in the design of the generator nonlinear excitation controller, a high performance nonlinear excitation control law is found out successfully. Simulation results show that the proposed controller can effectively coordinate the dynamic and the steady-state performances of the synchronous generator. Both the regulative precision of the generator terminal voltage and the stability of the generator unit with the developed control are enhanced. The proposed controller is valuable for industrial application.