scholarly journals Characteristic Analysis and Fault-Tolerant Control of Circulating Current for Modular Multilevel Converters under Sub-Module Faults

Energies ◽  
2017 ◽  
Vol 10 (11) ◽  
pp. 1827 ◽  
Author(s):  
Wen Wu ◽  
Xuezhi Wu ◽  
Jingyuan Yin ◽  
Long Jing ◽  
Shuai Wang ◽  
...  
Keyword(s):  
Fault Tolerant ◽  
Fault Tolerant Control ◽  
Characteristic Analysis ◽  
Multilevel Converters ◽  
Circulating Current ◽  
Modular Multilevel Converters

scholarly journals Fault-Tolerant Control Strategies and Capability without Redundant Sub-Modules in Modular Multilevel Converters

Energies ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1726 ◽  
Author(s):  
Jinke Li ◽  
Jingyuan Yin
Keyword(s):  
Fault Tolerant ◽  
Control Strategies ◽  
Fault Tolerant Control ◽  
Mathematics Model ◽  
Multilevel Converters ◽  
Modular Multilevel Converters ◽  
Voltage Balance ◽  
And Performance ◽  
Level Converter ◽  
The Impact

Sub-module (SM) faults in modular multilevel converters (MMCs) without redundancies result in unbalanced converter output voltages and improper control of modulation due to an unequal number of SMs inserted between the different phase-legs. The derived mathematics model of the MMC demonstrates the impact of the SM fault in the circulating currents and capacitor voltages. For achieving the SM fault-tolerance, detailed analysis of the MMC’s electrical quantities under SM fault-tolerant algorithms is provided together with two modulation reconfiguration techniques for maintaining voltage balance. Fault-tolerant abilities of the two modulation algorithms are also discussed and defined. Simulation results from a 21-level converter and experimental work in a three-phase five-level converter demonstrate the feasibility and performance of the proposed fault-tolerant control strategies.

scholarly journals Submodule fault-tolerant control based adaptive carrier-PDPWM for modular multilevel converters

2021 ◽  
Vol 7 ◽  
pp. 7288-7296
Author(s):  
Ahmed Elsanabary ◽  
Tuanku Badzlin Hashfi ◽  
Saad Mekhilef ◽  
Mehdi Seyedmahmoudian ◽  
Alex Stojcevski
Keyword(s):  
Fault Tolerant ◽  
Fault Tolerant Control ◽  
Multilevel Converters ◽  
Modular Multilevel Converters

scholarly journals Lifetime and reliability improvements in modular multilevel converters using controlled circulating current

2021 ◽  
Author(s):  
Nasiru B. Kadandani ◽  
Mohamed Dahidah ◽  
Salaheddine Ethni ◽  
Musbahu Muhammad
Keyword(s):  
Control Method ◽  
Semiconductor Devices ◽  
Junction Temperature ◽  
Multilevel Converters ◽  
Control Approach ◽  
Circulating Current ◽  
Inherent Feature ◽  
Modular Multilevel Converters ◽  
Current Loading ◽  
Laboratory Prototype

AbstractCirculating current has been an inherent feature of modular multilevel converters (MMC), which results in second-order harmonics on the arms currents. If not properly controlled, the circulating current can affect the lifetime and reliability of a converter by increasing the current loading, loss distribution, and junction temperature of its semiconductor devices. This paper proposes controlled circulating current injection as a means of improving the lifetime and reliability of an MMC. The proposed method involves modifying the reference modulating signals of the converter arms to include the controlled differential voltage as an offset. The junction temperature of the semiconductor devices obtained from an electro-thermal simulation is processed to deduce the lifetime and reliability of the converter. The obtained results are benchmarked against a case where the control method is not incorporated. The incorporation of the proposed control method results in a 68.25% increase in the expected lifetime of the converter and a 3.06% increase on its reliability index. Experimental results of a scaled down laboratory prototype validate the effectiveness of the proposed control approach.

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