scholarly journals Hybrid Modular Multilevel Converter With Arm-Interchange Concept for Zero-/Low- Frequency Operation of AC Drives

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 14756-14766 ◽  
Author(s):  
Ahmed Elserougi ◽  
Ibrahim Abdelsalam ◽  
Ahmed Massoud ◽  
Shehab Ahmed
Keyword(s):  
Low Frequency ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Ac Drives

Research on the Voltage Balance Strategy of Modular Multilevel Converter

2014 ◽  
Vol 1055 ◽  
pp. 157-160
Author(s):  
Ji Min Jing ◽  
Jing Ze Wang ◽  
Yan Chao Ji
Keyword(s):  
Control Strategies ◽  
Low Frequency ◽  
Voltage Divider ◽  
Voltage Source ◽  
Stable Operation ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Factors Affecting ◽  
Capacitor Voltage ◽  
Voltage Balance

The modular multilevel converter (MMC) does not need clamping devices and multiple independent DC voltage source and has a modular structure which is easy to be extended to any level, share a DC side, easy to direct back to back four-quadrant operation and attracts widespread attention. Due to the use of sub-module MMC suspended on the DC side capacitor voltage divider provides synthetic AC output voltage required voltage level and therefore it is essential to the stable operation of the sub-module capacitor voltage balance of the MMC. In this paper, the factors affecting the MMC sub-module capacitor voltage balancing has been carried out a detailed analysis and this paper focuses on the nominal frequency erupted module capacitor voltage control strategies and the average low frequency sub-module capacitor voltage ripple suppression strategies.

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