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发现在进行非线性系统的非线性控制设计时 ,状态方程中输出函数的选取对线性化以后系统状态方程的形式有很大的影响 ,进而影响到所设计的控制器性能。在此研究结果的基础上 ,改进了电力系统非线性控制器的设计方法 ,可以在统一的非线性控制设计框架下同时对多个状态量的性能指标提出要求 ,兼顾受控系统多个状态量的响应特性 ,使系统的动态性能和静态性能能够很好地协调 ,实现高性能的非线性控制。将改进的设计方法应用于发电机组的励磁控制 ,采用逆系统非线性控制原理设计了一种具有综合性能指标的非线性励磁控制规律。将所设计的多指标非线性励磁控制律用于单机无穷大电力系统的同步发电机组中进行仿真实验 ,其结果表明所提出的控制器不仅能明显地提高发电机的动态稳定性 ,而且能准确地将发电机的端电压控制在其给定值上运行 ,不会因受扰而发生偏移。
It is found that the selection of the output function in the state equation has a great influence on the form of the system state equation after linearization when the non-linear control design of the nonlinear system is carried out, thus affecting the performance of the designed controller. Based on the results of this study, the design method of nonlinear controller in power system is improved. The performance of multiple state variables can be put forward simultaneously under the unified nonlinear control design framework, taking into account the multiple state variables of the controlled system Response characteristics, so that the system’s dynamic performance and static performance can be well coordinated to achieve high-performance nonlinear control. The improved design method is applied to the excitation control of generator set, and a non-linear excitation control law with comprehensive performance index is designed by using the inverse system nonlinear control principle. The simulation results show that the proposed controller not only can obviously improve the dynamic stability of the generator, but also can accurately predict the dynamic stability of the generator. The generator terminal voltage control to run on its given value, will not be offset by the disturbance.