一种三相并联有源滤波器的仿真研究

针对广泛使用的非线性负载产生谐波和导致功率因数较低的问题，在建立三相并联型有源电力滤波器数学模型的基础上，把滑模变结构控制和模糊控制趋近律相结合，设计了一种基于模糊滑模变结构控制策略、用于抑制电网谐波、提高负戴功率因数的三相并联型有源电力滤波器。模糊滑模变结构控制方案不仅消除了滑模变结构控制固有的高频颤动现象，对模型不确定性和外部干扰具有较强的鲁棒性，而且改善了系统到达段的品质，同时跟踪误差可收敛到零的一个邻域内。通过仿真对该控制模型进行了验证，结果表明，方案切实可行，系统具有良好的动静态性能。

Simulation Research of Shunt Three Phase Active Power Filter

Aiming to the problem of harmonics and low power factor caused by widely-used nonlinear load, and according to the mathematic mode of shunt three-phase active power filter, a shunt three-phase active power filter based on fuzzy-sliding mode variable structure control strategy which was by incorporating the sliding mode variable structure control and fuzzy control reaching-law was designed to suppress the harmonics and improve power factor. It could not only eliminate the chattering of sliding model variable structure control and make system have strong robustness against model uncertainties and external disturbance, but could also improve the character of reaching segment and tracking errors converge to a range of zero, This control method was verified by simulation, and the results of simulation show the control method is feasible, and have good dynamic and static performance in this system.