带电压调节的非线性鲁棒励磁控制策略研究

Nonlinear robust excitation control strategy with voltage regulation

针对电力系统的非线性特性和内外扰动的影响,结合微分几何精确反馈线性化和非线性鲁棒H∞控制理论,提出了一种新的励磁控制器设计方法,在励磁控制规律引入了机端电压反馈,使得所设计的控制器不仅提高了电力系统暂态稳定性,而且在机械功率由于负荷或调速而变化时机端电压仍能回复到给定点上运行。将该控制方法运用到单机无穷大电力系统设计中,用Matlab/Simulink进行三相短路实验和机械功率扰动实验,结果表明:与非线性励磁控制器及传统的PID控制器相比,所设计的带电压调节功能的非线性鲁棒H∞控制器在提高电力系统的稳定性及稳定机端电压方面有很好的控制效果。

Combined with the exact feedback linearization based on differential geometry and the nonlinear robust H∞ control theory,an excitation control strategy is proposed,which takes the nonlinearity of power system and the inner or external disturbances of power system into consideration and introduces the terminal voltage feedback of generator to control rules. The designed controller enhances the transient stability of power system and stabilizes the terminal voltage about the given operating point when mechanical power varies with load or speed regulation. It is applied to a single- machine infinite power system and tested by both three- phase short- circuit and mechanical power disturbance simulations with Matlab/Simulink. Results show that,compared with the nonlinear excitation controller and the traditional PID controller,the designed nonlinear robust H∞ controller with terminal voltage regulation has better control effect on stabilizing power system and generator terminal voltage.