State observer based capacitor-voltage-balancing method for modular multilevel converters without arm-current sensors

被引：9
|
作者：
Hu, Pengfei [1 ]
Teodorescu, Remus [2 ]
Guerrero, Josep M. [2 ]
机构：
[1] Univ Elect Sci & Technol China, Sch Mech & Elect Engn, Chengdu 611731, Sichuan, Peoples R China
[2] Aalborg Univ, Dept Energy Technol, DK-9220 Aalborg, Denmark
来源：
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS | 2019年 / 113卷
关键词：
Modular Multilevel Converter (MMC); Sorting and selection; Capacitor voltage balancing; State observer; Sensorless; HVDC SYSTEM; OPERATION;
D O I：
10.1016/j.ijepes.2019.05.025
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
This paper proposes a state observer (SO) based capacitor-voltage-balancing method for modular multilevel converters (MMCs) without arm-current sensors. Without the knowledge of the actual arm-current signals, this method can balance capacitor voltages while reducing the sampling signals, compacting the control system and saving the overall cost. In this paper, the arm-current value estimated by an SO, instead of the measured one, is employed to determine which sub-modules (SMs) should be inserted or bypassed. Furthermore, the design procedure of the proposed SO is presented. In addition, a medium voltage MMC (20 kV, 25 MW) simulation model using Matlab/Simulink is constructed to verify the proposed method. Finally, the proposed method is also validated by experimental results based on a scaled-down MMC prototype.
引用
收藏
页码：188 / 196
页数：9
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