Load changing behaviour significantly affects the compensating current control performance of active power filters (APFs). Owing to this effect, harmonic currents at the source can significantly degrade the power quality of the system. This work proposes an adaptive repetitive controller based on a fuzzy logic algorithm to improve current control performance. In addition, a new design approach to fuzzy membership functions is also proposed. The design concept for the adaptive repetitive controller follows a stability analysis of the compensating current control and a mathematical model of the APF. In experimental testing, a power system was implemented with the proposed controller using the processor - in - the - loop technique on an eZdsp™ F28335 board and the MATLAB / Simulink programme. The experimental results indicated that the proposed adaptive repetitive controller would provide better harmonic current-tracking performance compared with conventional repetitive controllers. Also, the APF used in conjunction with the proposed controller would efficiently mitigate harmonic currents even where non-linear loads changed. Moreover, the percentage of total harmonic distortion would be maintained within the IEEE standard 519–2014.

中文翻译：

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适用于有源滤波器的自适应重复控制器分为三类--第四阶段--电线系统

负载变化行为会严重影响有源功率滤波器（APF）的补偿电流控制性能。由于这种影响，电源上的谐波电流会大大降低系统的电能质量。这项工作提出了一种基于模糊逻辑算法的自适应重复控制器，以提高电流控制性能。此外，还提出了一种新的模糊隶属度函数设计方法。自适应重复控制器的设计概念遵循补偿电流控制的稳定性分析和APF的数学模型。在实验测试中，使用建议的控制器使用处理器来实现电源系统 -- 在 -- 的 -- eZdsp™F28335板上的循环技术和MATLAB / Simulink程序。实验结果表明，与传统的重复控制器相比，该自适应重复控制器将提供更好的谐波电流跟踪性能。而且，即使非线性负载发生变化，与所提出的控制器结合使用的APF也会有效地减轻谐波电流。此外，在IEEE标准519–2014中，总谐波失真的百分比将保持不变。