Study on Effect of Dead Time of Three-Phase Four-Wire System Three-Level APF and Its Suppression Strategy

doi:10.16628/j.cnki.2095-8188.2021.10.011

Abstract

Abstract:

In order to suppress the effects caused by the addition of dead time to the three-phase four-wire NPC-type three-level active power filter (APF),this paper provides a detailed analysis of the dead time effect generation mechanism and the effects of dead time on the output voltage under different switching states and current directions.The dead-time suppression strategy is proposed for the effect brought by the addition of dead-time,and the experimental results verify the effectiveness of the method.

Key words: active power filter (APF), dead time impact, dead time compensation, dead time impact suppression

CLC Number:

TM761

ZHAO Weijie, CHANG Wenjing, HUANG Haihong. Study on Effect of Dead Time of Three-Phase Four-Wire System Three-Level APF and Its Suppression Strategy[J]. LOW VOLTAGE APPARATUS, 2021, 0(10): 65-72.

Figures/Tables 14

References 11

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电流方向	电路状态	输出电平	VTA1	VTA2	VTA3	VTA4
i_A >0	正	+1	1	1	0	0
	死区时间	+1	0	1	0	0
	零	0	0	1	1	0
	死区时间	0	0	0	1	0
	负	-1	0	0	1	1
	死区时间	0	0	0	1	0
	零	0	0	1	1	0
	死区时间	+1	0	1	0	0
	正	+1	1	1	0	0

电流方向	电路状态	输出电平	影响
i_A>0	正→零	+1	+1的时间增加了T_d
	零→正	+1	无影响
	负→零	0	无影响
	零→负	0	-1的时间减少了T_d
i_A<0	正→零	0	无影响
	零→正	0	+1的时间减少了T_d
	负→零	-1	-1的时间增加了T_d
	零→负	-1	无影响