单相系统中,利用并联型有源电力滤波器(Active Power Filter,APF)进行谐波治理时,传统的电流比例积分(Proportional Integral,PI)控制方式具有较快的响应速度,但3次谐波电流不能得到充分抑制,针对这一问题采用准比例谐振控制器对3次谐波电流进行跟踪控制。APF系统采用LCL型滤波器结构与单相系统相连,使用陷波滤波器对ip-iq谐波电流检测算法进行改进,以提高谐波电流检测精度,消除数字低通滤波器输出侧直流信号中的低频波动问题。最后通过Matlab/Simulink建立单相并联型APF谐波治理系统模型,验证了所提控制策略的可行性和有效性。
英文摘要:
In a single-phase system, when a parallel active power filter is used for harmonic suppression, the traditional current PI control method has a faster response speed, but the third harmonic current cannot be sufficiently suppressed.A quasi proportional-resonant controller is adopted to track and control the third harmonic current to solve this problem.The LCL type filter is used to connect to the grid.In order to eliminate the problem of low frequency fluctuations in the DC signal output from digital low pass filters and improve the accuracy of harmonic current detection, a notch filter is adopted to improve the traditional ip-iq harmonic current detection method.Finally, a single-phase parallel active power filter harmonic suppression system is built by Matlab / Simulink, which verifies the feasibility and effectiveness of the proposed control method.