Research on Harmonic Detection and Active Power Filter Control Based on FFT-Kalman Filter

doi:10.16628/j.cnki.2095-8188.2026.06.004

Abstract

Abstract:

Aiming at the defects of poor real-time performance and low detection accuracy existing in traditional harmonic detection algorithms, a harmonic detection method combining fast Fourier transform (FFT) and Kalman filter is proposed, which is applied to the control system of shunt active power filter (APF). Firstly, the FFT algorithm is used to perform spectrum analysis on current signals and extract the amplitude and phase of each harmonic component. Secondly, the Kalman filter is adopted to dynamically estimate detection data and suppress noise, so as to improve detection precision and anti-interference capability. A double closed-loop control structure combining DC-side voltage PI control and current hysteresis tracking control is adopted in the system. Simulation results indicate that the proposed method can detect grid harmonic currents rapidly and accurately. After compensation, the total harmonic distortion of source current drops from 25.38% to 2.67%, which satisfies the national standard requirements and verifies the validity of the proposed method.

Key words: fast Fourier transform, Kalman filtering, harmonic detection, active power filter, power quality

CLC Number:

TM761.1

LU Wenjiang, ZHAO Yun. Research on Harmonic Detection and Active Power Filter Control Based on FFT-Kalman Filter[J]. LOW VOLTAGE APPARATUS, 2026, 0(6): 28-36.

Figures/Tables 8

References 15

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参数	数值
电网电压有效值U_s/V	220
电网频率f/Hz	50
直流侧电压参考值${\mathit{U}}_{\mathrm{d}\mathrm{c}}^{\mathrm{*}}$/V	700
直流侧电容C_dc/μF	4 700
滤波电感L/mH	2
采样频率f_s/kHz	10
FFT点数N	256
滞环带宽h/A	0.5
过程噪声协方差矩阵Q	diag([0.01,0.001])
测量噪声协方差矩阵R	diag([1,0.1])

谐波次数	补偿前/%	补偿后/%	补偿率/%
5	19.2	1.8	90.6
7	13.5	1.2	91.1
11	8.6	0.8	90.7
13	6.2	0.5	91.9
THD	25.38	2.67	89.50