Gao Yifei, Zhu Liancheng, Wang Xiaoyang, Wei Hongshi, Lv Xiaoguo
School of Electrical Engineering, Liaoning University of Technology, Jinzhou, China.
Research and Development Department, Liaoning Rongxin Xingye Electric Power Technology Company, Limited, Anshan, China.
PLoS One. 2025 Feb 20;20(2):e0318558. doi: 10.1371/journal.pone.0318558. eCollection 2025.
Active power filter (APF) is a new type of harmonic mitigation device, and its harmonic mitigation capability mainly depends on the control strategies of current inner loop and voltage outer loop. Traditional proportional integral (PI) control methods cannot track harmonic currents without steady-state error, thereby it leads to the poor tracking accuracy of the harmonic current and is difficult to achieve high-performance harmonic compensation. Thus, in this paper, a repetitive quasi-proportional resonant (QPR) with linear active disturbance rejection control (LADRC) is proposed. Firstly, QPR control is introduced to replace PI control. QPR control can eliminate steady-state error and realize no static error tracking of harmonic current. Meanwhile, QPR control can coordinate control of various frequency components and enhance APF's ability to suppress specific harmonics. Then, the introduction of repetitive control optimizes the QPR control, so that the dynamic performance of the system does not change while further improving the tracking accuracy of the APF system for harmonic current. Finally, LADRC control is used to observe and compensate for the coupled parts of the system. Thereby, it can achieve high-performance decoupling without adding additional sensors. In addition, in order to ensure the stability of the DC-side voltage and enhance its dynamic performance, this paper also designs a voltage outer loop controlled by QPR. The proposed method is verified by real-time digital simulation system (RTDS). The simulation results show that compared with the double closed-loop PI control, the repetitive quasi-proportional resonant with linear active disturbance rejection control (repetitive QPR-LADRC) and QPR double closed-loop control proposed in this paper can not only increase the harmonic current tracking accuracy of APF system, but also improve the dynamic performance of APF system and significantly enhance the harmonic suppression ability of APF.
有源电力滤波器（APF）是一种新型的谐波抑制装置，其谐波抑制能力主要取决于电流内环和电压外环的控制策略。传统的比例积分（PI）控制方法无法无稳态误差地跟踪谐波电流，从而导致谐波电流跟踪精度较差，难以实现高性能的谐波补偿。因此，本文提出了一种带有线性自抗扰控制（LADRC）的重复准比例谐振（QPR）控制方法。首先，引入QPR控制来取代PI控制。QPR控制能够消除稳态误差，实现对谐波电流的无静差跟踪。同时，QPR控制可以对各频率分量进行协调控制，增强APF抑制特定谐波的能力。然后，引入重复控制对QPR控制进行优化，使系统动态性能不变的同时进一步提高APF系统对谐波电流的跟踪精度。最后，采用LADRC控制对系统的耦合部分进行观测和补偿。从而，无需增加额外传感器就能实现高性能解耦。此外，为了保证直流侧电压的稳定性并增强其动态性能，本文还设计了由QPR控制的电压外环。所提方法通过实时数字仿真系统（RTDS）进行了验证。仿真结果表明，与双闭环PI控制相比，本文提出的带有线性自抗扰控制的重复准比例谐振（重复QPR-LADRC）和QPR双闭环控制不仅能提高APF系统的谐波电流跟踪精度，还能改善APF系统的动态性能，并显著增强APF的谐波抑制能力。
