Zero vector initial SVPWM neutral-point voltage balancing method and related assembly

Zero vector initial SVPWM neutral-point voltage balancing method and related assembly

The invention discloses a zero-vector initial SVPWM neutral-point voltage balancing method and a related component. The method comprises the following steps: acquiring a preset unbalance margin factor K and a direct-current side voltage Udc of a three-level inverter; the neutral-point voltage unbala...

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Hauptverfasser: GAO ZHAN, LAI NA, XIE YANGXU, CAI QI, ZHOU ZHIDA, WU XUANQIN, GENG CHENGFEI
Format: Patent
Sprache:chi ; eng
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APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS
CONTROL OR REGULATION THEREOF
CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
GENERATION
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creator GAO ZHAN
LAI NA
XIE YANGXU
CAI QI
ZHOU ZHIDA
WU XUANQIN
GENG CHENGFEI
description The invention discloses a zero-vector initial SVPWM neutral-point voltage balancing method and a related component. The method comprises the following steps: acquiring a preset unbalance margin factor K and a direct-current side voltage Udc of a three-level inverter; the neutral-point voltage unbalance value Udcdev of the three-level inverter is calculated; when Udcdev is greater than K * Udc, correcting the zero sequence voltage Uzero of the initial SVPWM of the zero vector at the peak value of the triangular carrier; when the Udcdev is less than-K * Udc, correcting the zero sequence voltage Uzero of the zero vector initial SVPWM at the triangular carrier zero point; and injecting the Uzero into a three-phase original modulation wave of the three-level inverter. According to the invention, when the neutral-point voltage unbalance value is positive or negative, neutral-point voltage balance control is realized by correcting the zero-sequence voltage, so that the reliability of the three-level NPC inverter und
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subjects APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS
CONTROL OR REGULATION THEREOF
CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
GENERATION
title Zero vector initial SVPWM neutral-point voltage balancing method and related assembly
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