弱电网APF系统稳定性分析及有源阻尼方法  

Stability Analysis and Active Damping Scheme for APF System Under Weak Grid Condition

作　　者：刘兴龙 谢懿晗 杨子阳 张志龙 易皓[2] 卓放[2] LIU Xinglong;XIE Yihan;YANG Ziyang;ZHANG Zhilong;YI Hao;ZHUO Fang(Measurement Center,Yunnan Power Grid Co.,Ltd.,Kunming 650051,Yunnan,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China)

机构地区：[1]云南电网有限责任公司计量中心,云南昆明650051 [2]西安交通大学电气工程学院,陕西西安710049

出　　处：《电气传动》2024年第8期10-18,26,共10页Electric Drive

基　　金：南方电网公司科技项目(YNKJXM20222155)。

摘　　要：有源电力滤波器(APF)被广泛应用于电力系统谐波的动态补偿。然而在弱电网条件下,APF、非线性负载与电网线路阻抗间的交互容易引发补偿频率附近谐波振荡的稳定性问题,导致APF谐波补偿失效,系统的电能质量进一步恶化。通过对APF系统环路的小信号建模,揭示了弱电网APF系统的谐波振荡机理,并根据稳定性分析结论提出了一种基于电感电流反馈的有源阻尼方法抑制了这类谐波振荡,从而保证了APF在弱电网条件下稳定的谐波补偿能力。该方法的有效性经PLECS时域仿真及硬件平台实验得以验证。Active power filters(APF)are widely used for dynamic compensation of power system harmonic.However,under weak grid conditions,the interaction between APF,nonlinear loads and grid impedance can easily lead to the stability issue of harmonic oscillation around the compensation frequency,resulting in the fault of harmonic compensation and further deterioration of the system's power quality.Through small-signal modelling of the loop,the harmonic oscillation mechanism in APF system under weak grid conditions was revealed,and an active damping scheme based on inductor current feedback was proposed to suppress harmonic oscillation according to the conclusion of stability analysis,which ensures the stable harmonic compensation capability of APF under weak grid conditions.The effectiveness of the proposed scheme was verified by PLECS time-domain simulations and hardware platform experiments.

关 键 词：有源电力滤波器 弱电网 小信号建模 稳定性分析 有源阻尼 

分 类 号：TM712[电气工程—电力系统及自动化]