基于复合重复控制的LCL型三相四开关有源电力滤波器

三相四开关有源电力滤波器TF-APF(three-phase four-switch active power filter)作为一种容错拓扑,能够在容错状态下运行,有效抑制谐波电流,其研究对于电力电子功率器件及系统可靠性运行具有重要意义;采用LCL型输出滤波器能进一步提高TF-APF中开关次高频谐波的滤波效果,提高补偿精度。针对LCL三阶系统的谐振峰问题,采用一种电容电流反馈的控制策略,有效抑制谐振峰,提升系统稳定性与可靠性;为提高系统对指令电流跟踪的稳态特性与动态特性,采用一种复合重复控制策略,以实现对TF-APF指令电流的精准、快速跟踪控制。基于Matlab仿真实验,验证了所提基于复合重复控制的LCL型TF-APF系统的可行性与有效性。

Three-phase Four-switch Active Power Filter with LCL-filter Based on Hybrid Repetitive Control

As a kind of fault-tolerant topology, the three-phase four-switch active power filter(TF-APF) can work und-er fault-tolerant conditions, which effectively suppresses harmonic current. Therefore, the research on TF-APF is of great significance for the reliable operation of power electronic devices and the system. Furthermore, the utilization of LCL-filter can improve the filtering effect for high-frequency harmonics during switching, thus increasing the compensation precision. As a three-order system, the LCL-filter has the phenomenon of resonance peak. Accordingly, acapacitor current feedback control strategy is used to effectively suppress the resonance peak and improve the stability and reliability of the system. To enhance the steady-state and dynamic characteristics of the system when tracking the reference current, a hybrid repetitive control strategy is used to realize the accurate and rapid track of reference current of TF-APF. Simulations are carried out based on Matlab, and results verify the validity and feasibility of the proposed system of TF-APF with LCL-filter based on hybrid repetitive control.