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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第11期    总第291期    2018年11月

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文章编号:1672-7207(2018)11-2886-08
混合型模块化多电平换流器的改进载波移相控制策略
夏向阳1, 2,邱欣2, 3,曾小勇1, 2,谭黎军4,孟科2,邱靖2,龚芬3,肖辉2,汤赐2,邓丰2

(1. 电网输变电设备防灾减灾国家重点实验室,湖南 长沙,410129;
2. 长沙理工大学 电气与信息工程学院,湖南 长沙,410014;
3. 中车株洲电力机车研究所有限公司,湖南 株洲,412001;
4. 特变电工衡阳变压器有限公司,湖南 衡阳,421007
)

摘 要: 基于半桥子模块和全桥子模块组成的子模块混合型模块化多电平换流器桥臂不仅具备直流侧故障自愈能力,而且具有更高的设备利用率和更低的功率损耗特性,提出一种适用于换流器输出电平数较少的该类子模块混合型模块化多电平换流器(modular multilevel converter,MMC)的改进载波移相控制策略。该控制策略将载波移相调制和基于排序的传统子模块电容电压均衡方法相结合,采用附加控制器维持半桥和全桥子模块阀段间电压平衡,并在PSCAD/EMTDC中搭建子模块混合型MMC仿真模型。研究结果表明:所提出的改进载波移相控制策略是可行和有效的,采用附加控制器可维持半桥和全桥子模块阀段间电压平衡,有效避免最近电平逼近调制(nearest level modulation,NLM)应用于电平数较少换流器带来的谐波问题,提高波形质量,适用于子模块数量较少的低电压场合。

 

关键词: 模块化多电平换流器;子模块混合型;载波移相;直流侧故障;电容电压平衡

Modulation strategy of improved carrier phase shift for hybrid modular multilevel converter
XIA Xiangyang1, 2, QIU Xin2, 3, ZENG Xiaoyong1, 2, TAN Lijun4, MENG Ke2, QIU Jing2, GONG Fen3, XIAO Hui2, TANG Ci2, DENG Feng2

1. State Key Laboratory of Disaster Prevention and Reduction for Power Grid Transmission and Distribution Equipment, Changsha 410129, China;
2. College of Electrical and Information Engineering, Changsha University of Science & Technology,
Changsha 410114, China;
3. China Railway Rolling Stock Corporation, Zhuzhou Research Institute Co. Ltd., Zhuzhou 412001, China;
4. TEBIAN Electric Apparatus Stock Corporation, Hengyang Transformer Co. Ltd., Hengyang 421007, China

Abstract:For that the hybrid modular multilevel converter arm based on half-bridge module and full-bridge module not only has DC side fault self-healing capability, but also has higher equipment utilization and lower power loss characteristics, an improved carrier phase shifting control strategy was presented for the hybrid modular multilevel converter with fewer output levels. The control strategy combined the carrier phase shifting modulation with the traditional sub-module capacitance equalization method based on sorting, and an additional controller was proposed to maintain the voltage balance between the half-bridge and the full-bridge sub-modules. Finally, the simulation model of sub-module MMC was built in PSCAD/EMTDC. The results show that the improved carrier phase shifting control strategy is feasible and effective, the additional controller maintains the voltage balance between the half-bridge and the full-bridge sub-modules. It can effectively avoid the harmonic problems, and is suitable for low voltage occasions with fewer sub-modules.

 

Key words: modular multilevel converter; sub module hybrid; carrier phase shifting; DC side fault; capacitor voltage balance

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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