四桥臂有源滤波器的三电平3D-SVPWM控制策略研究

Research on Three⁃level 3D⁃SVPWM Control Strategy of Four⁃bridge⁃arm Active Power Filter

四桥臂有源滤波器(active power filter,APF)采用传统无差拍控制策略,动态性能好但控制精度差。重复控制动态性能差但控制精度好,两者结合可有效解决单独运用存在的缺陷,电流环采用无差拍重复控制保证响应速度与控制精度。传统三电平3D-SVPWM调制过程繁杂,提出将三电平空间矢量分解为两电平结构,进一步利用简化的两电平调制策略进行脉宽调制,提高APF效率。通过在MATLAB/SIMULINK中建立仿真模型,验证控制策略的正确性。

Four⁃bridge⁃arm active power filter based on the traditional deadbeat control strategy has good dynamic performance but the control accuracy is poor.The repetitive control has poor dynamic performance but the control accuracy is great.The combination of the two strategies can effectively solve the shortcom⁃ings of independent use.The current loop uses deadbeat⁃repetitive control to ensure response speed and control accuracy.The traditional three⁃level 3D⁃SVPWM control strategy of APF is complicated,this thesis proposes a simplified control strategy to make it more effective.The three⁃level voltage vectors can be de⁃composed into two⁃level structures.Then,a simplified two⁃level pulse width modulation control strategy can be utilized to improve the calculation efficiency of APF.By establishing a simulation model in Matlab/Simulink,the effectiveness of the control strategy is verified.