基于滑模变理论的APF谐波控制方法研究

针对三相四线制系统谐波控制中有源电力滤波器特性,以四桥臂三相四线制为电路基本结构,提出了一种谐波补偿控制方法。由于APF具有非线性特性,为了免受系统外部的耦合干扰,通过滑模变结构控制方法对谐波进行补偿控制,定义滑模面,通过等效控制设计滑模变结构控制器,进而锁定滑模面参数范围,求得系统开关函数。通过MATLAB仿真,验证方法具有稳定性好,补偿效果优良等优点。研究成果对APF的工程实际应用具有一定的借鉴意义。

Research of Harmonic Control based on Sliding Mode Variable Theory

This paper puts the APF that can compensate for harmonic in three-phases four wires system to the researching object, in the basis of the four bridges three phases four wires mains circuits structure, studying the new methods for harmonic compensation controlling strategies for APF.Taking into accounting the nonlinear natures of the APF, sliding mode variable structures controlling strategy is adopted as its small affecting by system parameters and external disturbance and better statics and performance, on the target of minimize tracking errors, defining the slid surface, sliding modes controller is designed by equivalent control, analyzing reach ability condition, determining the range of the surface parameters and obtaining the function. Simulation result shows that the proposed method has the advantage of better stability. The research of this paper has a little certain referenced value for engineering applications of three-phase four-wire system APF.