基于Minimax理论的电力系统非线性干扰抑制和稳定控制研究

本项目主要围绕多机电力系统的暂态稳定控制问题展开深入研究。针对实际电力系统中线路受到短路接地故障或者某号母线发生负荷扰动等大干扰的情形，提出一种新的基于Backstepping理论的Minimax稳定控制器的设计方法，研究多机电力系统的大干扰抑制问题。为避免直接将连续控制器应用到计算机采样系统中，而使得系统随采样周期增加而趋于不稳定，提出Minimax逆推大干扰采样抑制策略，进一步改善多机电力系统的鲁棒性和对大干扰的不敏感性。通过构建合理的逻辑切换律，提出基于Minimax理论的汽轮机调速系统的暂态稳定条件，研究系统输入控制量受幅值约束限制的问题。为验证本项目研究成果在改善动态稳定性方面的有效性，建立基于STATCOM的数字化控制电路系统仿真平台并设计相关实验。本项目研究成果为解决电力系统大干扰抑制和稳定控制问题提供新的途径与方法，具有重要的理论意义和潜在的应用价值。

Research on transient stability control problem for multi-machine power system is carried out in this subject. By considering the effect of large disturbances occurring to practical power system, such as the short-circuit ground fault, the mechanical power of disturbances on generator and the load disturbance on certain bus, the design method of Minimax stable controller based on the Backstepping theory is proposed. If the continuous-time controller is applied to a computer sampled-data system directly, the power system may be transferred to unstable state with the increase of sampling time. To avoid the unstable trend, the large disturbance sampling attenuation method based on Minimax Backstepping is proposed. This method improves the robustness and the insensitivity to large disturbances of the system. By building reasonable logic switching law, transient stability conditions of the steam turbine speed control system based on Minimax theory is proposed，and research the problems of amplitude constraint for system input control variable. In order to verify the research results of the project to improve the effectiveness of the dynamic stability, the digitization control of the circuit system simulation platform based on STATCOM is established and relevant experiments are designed. In order to solve the problem of large interference suppression and stability control of power system, the research project provides new approaches and methods, which has important theoretical significance and potential applications.