Simple fuzzy proportional control on DC-link voltage of active power filters

doi:10.3969/j.issn.2097-0706.2022.04.004

Abstract

Abstract:

Active power filter（APF）is the most effective device for mitigating current harmonics.And its DC-link voltage must be sufficiently constant in value so that APF can work properly.There have been literatures about the studies on DC-link voltage regulation,but they haven't released the internal mechanisms of DC-link voltage or presented an optimal control algorithm.Based on the analysis on characteristics of APF,a simple fuzzy proportional（SFP）control algorithm for DC-link voltage is proposed.The SFP controller adjusts proportional gain K_p based on fuzzy logic.Keeping the K_p low in steady state can improve the compensation quality,and increasing the value of K_p in transient state can accelerate the convergence.Thus,the controller performs well in harmonics suppression and stabilizing operation.Besides,the proposed SFP controller is of simple structure and clear physical meaning.Finally,simulation and experiments proved that the proposed method can accelerate the convergence of APF,and suppress the harmonics stably and effectively..

Key words: APF, DC-link voltage, SFP control, steady state, transient state, power quality

CLC Number:

TK01：TM60

LIANG Xiwen, WANG Yingpin, LI Lin, XIE Yunxiang. Simple fuzzy proportional control on DC-link voltage of active power filters[J]. Integrated Intelligent Energy, 2022, 44(4): 28-35.

Figures/Tables 20

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规则	ΔU_dc	K_p
1	NL,PL	L
2	NS,PS	M
3	ZE	S

项目	符号	值
电网电压/V	U_s	220
基波频率/Hz	f	50
开关频率/kHz	f_sw	9.6
变换器侧L滤波器/（mH·Ω^-1）	L₁/R₁	0.45/0.02
C滤波器/μF	C	20
电网侧L滤波器/mH	L₂	0.07
参考直流电压/V	u_dc	700
直流侧电容/μF	C_dc	5 000

控制算法	13 kW负载	9 kW负载	低直流电压
PI	4.62	4.02	3.53
VPI	4.53	3.99	3.46
SFP	4.35	3.89	3.39