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Harmonic compensation and resonance damping for SAPF with selective closed-loop regulation of terminal voltage

机译：SAPF的谐波补偿和谐振阻尼，对端子电压进行选择性闭环调节

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摘要

Shunt active power filter (SAPF) is conventionally designed to compensate harmonic currents from non-linear load. However, due to parallel resonance between line impedance and capacitive load, the distortion of the voltage at point of common coupling (PCC) and grid current may not be mitigated completely by traditional manner of SAPF. This paper investigates harmonic compensation and resonance damping combined control for SAPF with selective closed-loop regulation of PCC voltage. Through developing equivalent circuit model, physical principle of SAPF with the proposed scheme is analysed as well as resonance frequency shifting phenomenon. To compensate specified harmonic currents, compensation reference is extracted flexibly by means of improved recursive discrete Fourier transform algorithm with phase-angle compensation. Meanwhile, selective virtual conductance with proportional–integral (PI) regulation of PCC voltage is proposed to damp parallel resonance. Then, a zero steady-state error controller composed of ordinary PI and advanced repetitive controller in parallel under synchronous rotation frame is adopted to improve current tracking performance of SAPF. Experimental results are provided to verify the effectiveness of the proposed method.
机译：并联有源功率滤波器（SAPF）通常设计用于补偿非线性负载产生的谐波电流。但是，由于线路阻抗和电容性负载之间存在并联谐振，因此传统的SAPF方式可能无法完全减轻公共耦合点（PCC）处的电压失真和电网电流。本文研究了具有选择性闭环调节PCC电压的SAPF谐波补偿和共振阻尼组合控制。通过建立等效电路模型，分析了所提出方案的SAPF的物理原理以及谐振移频现象。为了补偿特定的谐波电流，通过具有相位角补偿的改进的递归离散傅里叶变换算法可以灵活地提取补偿参考。同时，提出了通过比例积分（PI）调节PCC电压的选择性虚拟电导来抑制并联谐振。然后，采用由普通PI和高级重复控制器在同步旋转框架下并联组成的零稳态误差控制器，以提高SAPF的电流跟踪性能。实验结果证明了该方法的有效性。

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