scholarly journals Quasi two-level PWM operation of a nine-arm modular multilevel converter for six-phase medium-voltage motor drives

2018 ◽  
Author(s):  
Mohamed S. Diab ◽  
Grain P. Adam ◽  
B. W. Williams ◽  
Ahmed M. Massoud ◽  
Shehab Ahmed
Keyword(s):  
Motor Drives ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Medium Voltage ◽  
Phase Medium

scholarly journals A Hybrid Modular Multilevel Converter for Medium-Voltage Variable-Speed Motor Drives

2017 ◽  
Vol 32 (6) ◽  
pp. 4619-4630 ◽  
Author(s):  
Binbin Li ◽  
Shaoze Zhou ◽  
Dianguo Xu ◽  
Stephen J. Finney ◽  
Barry W. Williams
Keyword(s):  
Motor Drives ◽  
Modular Multilevel Converter ◽  
Variable Speed ◽  
Multilevel Converter ◽  
Medium Voltage ◽  
Variable Speed Motor

Hybrid modular multilevel converter with cascaded full bridges for medium-voltage motor drives

2019 ◽  
Vol 41 (12) ◽  
pp. 3279-3291 ◽  
Author(s):  
Yu Jiali ◽  
Xia Chaoying
Keyword(s):  
High Frequency ◽  
Stable State ◽  
High Amplitude ◽  
Motor Drives ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Voltage Fluctuation ◽  
Constant Frequency ◽  
Medium Voltage ◽  
Capacitor Voltage

Modular multilevel converter (MMC) is especially appropriate in high-voltage constant-frequency systems due to its modularity and scalability. But, so far MMC has not been widely used in motor drives applications. Since the capacitor voltage fluctuation is proportional to the output current amplitude and inversely proportional to the output frequency under constant torque load, at the low-speed, the excessive sub-module (SM) capacitor voltage fluctuation is one of the major obstacles for MMC applied in motor drives. To suppress the SM capacitor voltage fluctuation, an effective solution is to inject a high frequency zero sequence voltage to the three-phase output voltages of MMC and control the circulating current per phase reasonably. However, the introduced high frequency and high amplitude common voltage at the motor side is harmful. In this paper, a hybrid MMC with cascaded full-bridge SMs (HMMC-CFB) topology is used in the medium-voltage motor drives. The high frequency and high amplitude common mode voltage is absorbed by the cascaded full-bridge SMs. Besides, the capacitor voltage fluctuations of each arm and the cascaded full-bridge SMs is easily limited within a reasonable range. Finally, the state space model of HMMC-CFB system is established and a stable state-error feedback control law is given. By the passive theory, the necessary and sufficient condition for the globally uniformly asymptotical stability of the HMMC-CFB closed-loop system is deduced. Simulation results confirm the superiority of this novel topology and the validity of the proposed control strategy.

Modular Multilevel Converter Synthetic Inertia-Based Frequency Support for Medium-Voltage Microgrids

2019 ◽  
Vol 66 (11) ◽  
pp. 8992-9002 ◽  
Author(s):  
Shunfeng Yang ◽  
Jingyang Fang ◽  
Yi Tang ◽  
Huan Qiu ◽  
Chaoyu Dong ◽  
...  
Keyword(s):  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Medium Voltage
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