Modular Multilevel Converter for Low-Voltage Ride-Through Support in AC Networks

被引：5

作者：

Franca Bezerra de Souza, Victor Ramon ^{[1
]}

Barros, Luciano Sales ^{[2
]}

Costa, Flavio Bezerra ^{[1
]}

机构：

[1] Univ Fed Rio Grande do Norte, Grad Program Elect & Comp Engn, BR-59064720 Natal, RN, Brazil

[2] Univ Fed Paraiba, Comp Syst Dept, BR-58051900 Coronel Joao Pessoa, Brazil

来源：

ENERGIES | 2021年 / 14卷 / 17期

关键词：

modular multilevel converter (MMC); fault support; low-voltage ride-through (LVRT); multilevel converters; grid-connected systems; ENERGY;

D O I：

10.3390/en14175314

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：

New grid-connected systems have imposed additional requirements regarding reliability, power quality, high levels of power processing capacity, and fault support, where power converters have a crucial role in fulfilling these requirements. Overcoming one of these challenges, this paper proposes a new alternative application to improve the low-voltage ride-through (LVRT) support based on the arm impedance employment of the modular multilevel converter (MMC) by attenuating the fault impacts, avoiding overcurrents and overvoltages. This proposal does not require additional hardware or control loops for LVRT support, only using PI controllers. This paper evaluates symmetrical and asymmetrical grid fault impacts on the converter DC side of four converter topologies: two-level voltage source converter topology (2L-VSC), neutral point clamped (NPC), MMC, and 2L-VSC equipped with a DC-chopper, employing the same control structure for the four topologies, highlighting that the MMC contributed better to LVRT improvement under severe grid conditions.

引用

页数：12

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