Offset Voltage Control Scheme for Modular Multilevel Converter Operated in Nearest Level Control

被引：3
|
作者：
Kim, Jae-Hyuk [1 ]
Kim, Do-Hyun [1 ]
Han, Byung-Moon [1 ]
机构：
[1] Myong Ji Univ, Dept Elect Engn, 116 Myongji Ro, Yongin 449728, Gyeonggi Do, South Korea
来源：
ENERGIES | 2017年 / 10卷 / 07期
基金：
新加坡国家研究基金会;
关键词：
high voltage direct current (HVDC) system; modular multilevel converter (MMC); sub-module (SM); nearest level control (NLC); Offset voltage; modulation index (MI); total harmonic distortion (THD); SPACE-VECTOR; PWM METHOD; HVDC; FREQUENCY; MMC;
D O I：
10.3390/en10070863
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
This paper proposes an offset voltage control scheme for the modular multilevel converter (MMC) operated in nearest level control (NLC) to improve the total harmonic distortion (THD) of AC phase voltages. The offset (neutral-to-zero-point) voltage is adjusted so that the magnitude of each AC pole voltage maintains constant value with N + 1 level in the range of whole modulation index (MI). The validity of the proposed scheme was confirmed by computer simulations for the MMC with 22.9 kV/25 MVA and experimental works for the scaled MMC with 380 V/10 kVA. It was confirmed that the proposed control scheme can generate linearly variable AC phase voltages with improved THD in the over-modulation region as well as the normal-modulation region.
引用
收藏
页数：18
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