A Novel Series-Connected Asymmetric Hybrid Modular Multilevel Converter for HVDC Tapping Application

被引：5

作者：

Wang, Can ^{[1
]}

Yang, Yunming ^{[1
]}

Long, Zhili ^{[1
,2
]}

Pan, Xuewei ^{[1
]}

机构：

[1] Harbin Inst Technol, Dept Mech Engn, Shenzhen 518055, Peoples R China

[2] Guangdong Univ Technol, Minist Educ, Key Lab Precis Microelect Mfg Technol & Equipment, Guangzhou 510006, Guangdong, Peoples R China

来源：

IEEE ACCESS | 2019年 / 7卷

关键词：

Modular multilevel converter (MMC); HVDC tap; fault ride-through; harmonic suppression; unbalanced fault; CONTROL SCHEME; MODEL; TRANSFORMERLESS; REDUCTION;

D O I：

10.1109/ACCESS.2019.2906378

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

In this paper, a three-phase series-connected asymmetric hybrid modular multilevel converter (SCAH-MMC) tap is proposed. The proposed SCAH-MMC reduces the requirement of switches by connecting phases in series to withstand the dc-bus voltage and possesses the dc fault ride-through capability by partially employing full bridge sub-modules. The system structure and operation principle of SCAH-MMC are presented in detail, which reveals the immunity of the SCAH-MMC from dc faults. In order to solve the third harmonic problem of SCAH-MMC, the interactions of harmonic components in arms are investigated. Based on that, two feed-forward third harmonic suppression methods are proposed. Furthermore, a control strategy for the SCAH-MMC is introduced to maintain dc voltage balancing in each phase under unbalanced ac fault conditions. The effectiveness of third harmonic suppression methods and the proposed control strategies of SCAH-MMC are validated by simulations using PSCAD/EMTDC. The proposed SCAH-MMC is compared with other MMC topologies in terms of cost and control to show the merits of it.

引用

页码：41336 / 41348

页数：13

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