Common mode voltage and neutral point voltage balance control based on virtual vector diode clamped inverter

doi:10.19799/j.cnki.2095-4239.2019.0216

Abstract

Abstract:

The neutral-point voltage balance of three-level inverters has always been a research hotspot for researchers worldwide. This paper discusses common-mode voltage suppression and neutral-point voltage balance in three-level inverters for NPC. When constructing virtual vectors, the positive small vectors are neglected as they cause a large common-mode voltage. Second, depending on the voltage difference between the upper and lower capacitors on the DC side, a virtual vector that meets the demand is constructed to balance the neutral point voltage. Finally, a model that predicts the midpoint voltage in the next sampling period is established and an index measuring the quality of the output waveform is input to a function. Each vector allocation time is optimized by Lagrange multiplication. A simulation study conducted in MATLAB/Simulink showed that the proposed scheme suppresses and effectively controls the common-mode voltage.

Key words: diode clamp inverter, space vector, common mode voltage suppression, neutral point voltage balance

CLC Number:

TM 464

TAO Caixia, WAN Yingli, DU Xue, FU Minglu. Common mode voltage and neutral point voltage balance control based on virtual vector diode clamped inverter[J]. Energy Storage Science and Technology, 2020, 9(3): 927-934.

Figures/Tables 12

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References 16

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大矢量	中矢量	正小矢量	负小矢量	零矢量
PNN（0）	PON（i_a）	ONN（i_a）	POO（-i_a）	PPP（0）
PPN（0）	OPN（i_b）	PPO（i_c）	OON（-i_c）	NNN（0）
NPN（0）	NPO（i_c）	NON（i_b）	OPO（-i_b）	OOO（0）
NPP（0）	NOP（i_b）	OPP（i_a）	NOO（-i_a）
NNP（0）	ONP（i_a）	NNO（i_c）	OOP（-i_c）
PNP（0）	PNO（i_c）	POP（i_b）	ONO（-i_b）

定义矢量	矢量	幅值
零矢量	（000、222）、111	U_dc/2、0
正小矢量	100、010、001、221、122、212	U_dc/3
负小矢量	110、011、101、211、121、112	U_dc/6
中矢量	210、120、021、012、102、201	0
大矢量	200、020、002、220、022、202	U_dc/6