基于非线性变结构控制的统一潮流控制器对电力系统稳定性改善的研究

建立具有UPFC（统一潮流控制器,Unfied Power Flow Controller）的输电系统的动态数学模型.此模型的4个控制变量中,ψ2对系统稳定影响最显著.因此,文章结合非线性微分几何方法和变结构控制理论的优点,对ψ2控制向量进行了非线性变结构控制设计.同时也对m1,ψ1,m2控制向量分别进行线性控制设计.最后对单机--无穷大系统进行仿真分析.结果表明：具有非线性变结构控制的UPFC能更好地改善系统稳定性和鲁棒性.

Power System Stability Improvement Using UPFC Based on Nonlinear Variable Structure Control

The mathematic model of transmission system with UPFC (Unified Power Flow Controller) is built. Because (?)2 has the great effect on power system stability in the model with four variations, the nonlinear variable structure controller of (?)2 is obtained by combining the differential geometry structure theory with the variable structure theory. The line control design of m1, m2 and (?)1 are put forward. An infinite bus power system is simulated and analyzed. Simulation result verifies that nonlinear variable structure controller can make power system with UPFC have better stability and stronger robust.