A Back-Stepping Control Method for Modular Multilevel Converters

2021 ◽  
Vol 68 (1) ◽  
pp. 443-453 ◽  
Author(s):  
Mohammadali Ahmadijokani ◽  
Majid Mehrasa ◽  
Mohammad Sleiman ◽  
Mohammad Sharifzadeh ◽  
Abdolreza Sheikholeslami ◽  
...  
Keyword(s):  
Control Method ◽  
Multilevel Converters ◽  
Modular Multilevel Converters ◽  
Back Stepping Control

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.

A simple control method for modular multilevel converters

2017 ◽  
Author(s):  
Mohammad Sleiman ◽  
Bachir Kedjar ◽  
Handy Fortin Blanchette ◽  
Hadi Kanaan ◽  
Kamal Al-Haddad
Keyword(s):  
Control Method ◽  
Multilevel Converters ◽  
Modular Multilevel Converters

Variable Rounding Level Control Method for Modular Multilevel Converters

2021 ◽  
Vol 36 (4) ◽  
pp. 4791-4801
Author(s):  
Jiapeng Yin ◽  
Jose I. Leon ◽  
Marcelo A. Perez ◽  
Leopoldo G. Franquelo ◽  
Abraham Marquez ◽  
...  
Keyword(s):  
Control Method ◽  
Level Control ◽  
Multilevel Converters ◽  
Modular Multilevel Converters

scholarly journals A Modified One-Cycle-Control Method for Modular Multilevel Converters

Energies ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 157 ◽  
Author(s):  
Xu Tian ◽  
Yue Ma ◽  
Jintao Yu ◽  
Cong Wang ◽  
Hong Cheng
Keyword(s):  
Simple Structure ◽  
Pulse Width Modulation ◽  
Reactive Power ◽  
Control Method ◽  
Supply Voltage ◽  
Multilevel Converter ◽  
Grid Environment ◽  
Multilevel Converters ◽  
Modular Multilevel Converters ◽  
Drive Signals

In this paper, a new One-Cycle-Control (OCC) method is designed for a modular multilevel converter (MMC) based on the principle of the equivalent resistance constant. The proposed controller has a simple structure and a small amount of calculation by cancelling the current inner loop proportional integral (PI) controller and the inverse transform in the traditional direct-quadrature (DQ) control. Compared to the traditional OCC controller, the new one separates the control method from the modulation strategy, making it possible to use not only carrier-based pulse-width modulation (PWM), but also nearest level modulation PWM to generate drive signals. Besides, the independent control of the active and the reactive power is implemented by injecting a reference current with the same phase of the supply voltage or a reference current which lags the supply voltage by π/2 into the controller, so the converter can operate in four quadrants and it can work in either a grid-connect or off-grid environment. The feasibility and the performance of the proposed OCC method have been validated by both the simulation under the MATLAB/SIMULINK (R2012a) environment and experimental results.

Decentralized Control Method for Modular Multilevel Converters

2019 ◽  
Vol 34 (6) ◽  
pp. 5117-5130 ◽  
Author(s):  
Bing Xia ◽  
Yaohua Li ◽  
Zixin Li ◽  
Georgios Konstantinou ◽  
Fei Xu ◽  
...  
Keyword(s):  
Decentralized Control ◽  
Control Method ◽  
Multilevel Converters ◽  
Modular Multilevel Converters
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