有源电力滤波器改进电流预测无差拍控制方法

doi:10.16180/j.cnki.issn1007-7820.2021.11.011

摘要/Abstract

摘要：

针对无差拍控制过程中存在的延时及电感参数偏差问题,文中提出了有源电力滤波器改进电流预测无差拍控制方法。该控制方法采用拉格朗日二阶多项式插值法与重复控制相结合预测参考电流,提高了参考电流预测的精度。此外,该方法构造了补偿电流计算式并引入权重系数来减小电流纹波的影响,权重系数的引入又可减小电感参数偏差对系统稳定性的影响,然后通过系统稳定性分析给出权重系数的取值原则。MATLAB仿真结果表明,经该方法滤波后,网侧电流畸变率降至3.38%,有效改善了波形质量,并能够减小电感参数偏差对控制性能的影响。

关键词: 有源电力滤波器, 无差拍控制, 延时, 电感偏差, 改进电流预测, 拉格朗日插值法, 权重系数, 电流纹波

Abstract:

In view of the delay and inductance deviation coefficient problem in the process of deadbeat control, an improved current prediction deadbeat control method for active power filter is proposed. This method uses Lagrangian second-order polynomial interpolation method combined with repeated control to predict the reference current, which improves the accuracy of reference current prediction. Moreover, the compensation current calculation formula is constructed and the weight coefficient which can also reduce the influence of inductance parameter deviations on system stability is introduced to reduce the influence of current ripple. The value principle of the weight coefficient is given by the system stability analysis. MATLAB simulation results show that after filtering by this method, the grid-side current distortion rate is reduced to 3.38%, which indicates that the proposed method can effectively improve the waveform quality and reduce the influence of the inductance parameter deviation on the control performance.

Key words: active power filter, deadbeat control, delay, inductance variation, improved current prediction, Lagrangian interpolation, weight coefficient, current ripple

中图分类号:

TP29

任磊,付子义,雷海勋. 有源电力滤波器改进电流预测无差拍控制方法[J]. 电子科技, 2021, 34(11): 67-74.

REN Lei,FU Ziyi,LEI Haixun. Improved Current Prediction Deadbeat Control Method for Active Power Filter[J]. Electronic Science and Technology, 2021, 34(11): 67-74.

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参数	数值
直流侧电容/μF	2 500
直流母线电压/V	700
滤波电感/mH	2
开关频率/kHz	12
网侧线电压/V	380
负载电阻/Ω	15
负载电感/mH	2