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针对网络结构不确定的电力系统,提出了一种数学模型及其控制方案,用于保障发电机的功角稳定。文中从发电机经典3阶模型出发,根据系统结构特点,引入能够反映互联网络线路不确定通断情况的权因子,提出了一种能够反映系统结构不确定特性的非线性不确定模型。经过适当坐标变换后,采用基于Lyapunov方程的鲁棒控制策略,设计了发电机功角鲁棒线性控制器。通过Matlab/Simulink对一个3机系统进行仿真表明,文中所提出的控制器在抑制电力系统网络结构扰动对功角稳定的影响方面是有效的。
Aiming at the power system with uncertain network structure, a mathematical model and its control scheme are proposed to ensure the power angle stability of the generator. Based on the classic third-order generator model, this paper introduces a weighting factor that can reflect the uncertainties of interconnected lines according to the characteristics of the system structure. A nonlinear uncertain model that can reflect the uncertainty of the system structure is proposed. After proper coordinate transformation, a robust control strategy based on Lyapunov equation is adopted to design a robust linear controller of generator power angle. The simulation of a 3-machine system by Matlab / Simulink shows that the controller proposed in this paper is effective in suppressing the influence of power system network structure disturbance on the power angle stability.