多机电力系统固定时间动态面高阶滑模控制

A Study on the Fixed-Time Dynamic Surface High-Order Sliding Mode Control for the Multi-Machine Power System

针对含有参数不确定性和外部扰动的多机电力系统,设计了静止无功补偿器(SVC)与发电机励磁的协调控制器。动态面控制(DSC)方法与高阶滑模控制方法相结合,并引入固定时间概念,不仅避免了反步法中存在的“微分爆炸”问题,同时保证了系统的收敛时间上界独立于初始状态;采用范数估计方法,在线估计模糊逼近器权重向量的范数,大大减轻了控制器的计算负担。最后,在MATLAB仿真软件上对所提出控制算法进行了验证,实验结果表明设计的控制器具有较强的鲁棒性。

In this paper,the coordinated controller of the static var compensator(SVC)and the coordinated controller of the generator excitation are designed for the multi-machine power system with parameter uncertainties and external disturbances.The dynamic surface control(DSC)method is combined with the high-order sliding mode,and the concept of fixed time is introduced,which not only avoids the“differential explosion”problem in the backstepping method,but also ensures that the upper bound of the system s convergence time is independent of the initial status.The norm estimation method is used to estimate the norm of the weighted vector of the fuzzy approximator online,which greatly reduces the computational burden of the controller.Finally,the proposed control algorithm is verified on the MATLAB simulation software,and the experimental results show that the designed controller has strong robustness.