Analysis and Control of Three-Phase Modular Multilevel Converters Under the Single Arm Fault Condition

2019 ◽  
Vol 34 (9) ◽  
pp. 8293-8298 ◽  
Author(s):  
Chao Wang ◽  
Kui Wang ◽  
Zedong Zheng ◽  
Bo Yang ◽  
Kai Sun ◽  
...  
Keyword(s):  
Multilevel Converters ◽  
Three Phase ◽  
Modular Multilevel Converters ◽  
And Control

scholarly journals Fault Simulations in a Multiterminal High Voltage DC Network with Modular Multilevel Converters Using Full-Bridge Submodules

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1653
Author(s):  
Ioan-Cătălin Damian ◽  
Mircea Eremia ◽  
Lucian Toma
Keyword(s):  
High Voltage ◽  
Energy Resource ◽  
Fault Analysis ◽  
Renewable Energy Resource ◽  
Dynamic Simulations ◽  
Multilevel Converters ◽  
Strong Focus ◽  
Modular Multilevel Converters ◽  
Overhead Power Lines ◽  
And Control

The concept of high-voltage DC transmission using a multiterminal configuration is presently a central topic of research and investment due to rekindled interest in renewable energy resource integration. Moreover, great attention is given to fault analysis, which leads to the necessity of developing proper tools that enable proficient dynamic simulations. This paper leverages models and control system design techniques and demonstrates their appropriateness for scenarios in which faults are applied. Furthermore, this paper relies on full-bridge submodule topologies in order to underline the increase in resilience that such a configuration brings to the multiterminal DC network, after an unexpected disturbance. Therefore, strong focus is given to fault response, considering that converters use a full-bridge topology and that overhead power lines connect the terminals.

Analysis and Control of Modular Multilevel Converters Under Unbalanced Conditions

2013 ◽  
Vol 28 (4) ◽  
pp. 1986-1995 ◽  
Author(s):  
Yuebin Zhou ◽  
Daozhuo Jiang ◽  
Jie Guo ◽  
Pengfei Hu ◽  
Yiqiao Liang
Keyword(s):  
Multilevel Converters ◽  
Modular Multilevel Converters ◽  
And Control

Decoupled Current Model and Control of Modular Multilevel Converters

2015 ◽  
Vol 62 (9) ◽  
pp. 5382-5392 ◽  
Author(s):  
Ricardo Lizana ◽  
Marcelo A. Perez ◽  
David Arancibia ◽  
Jose R. Espinoza ◽  
Jose Rodriguez
Keyword(s):  
Current Model ◽  
Multilevel Converters ◽  
Modular Multilevel Converters ◽  
And Control

scholarly journals High-power modular multilevel converters: Modeling, modulation and control

2021 ◽  
Author(s):  
Apparao Dekka
Keyword(s):  
Model Predictive Control ◽  
Predictive Control ◽  
Harmonic Distortion ◽  
Switching Frequency ◽  
Multilevel Converters ◽  
Direct Model ◽  
Modular Multilevel Converters ◽  
Dual Stage ◽  
And Control ◽  
Circulating Currents

THIS dissertation addresses the technical challenges associated with the operation and control of high-power modular multilevel converters. To improve the performance of modular multilevel converter (MMC), a generalized three-phase mathematical model with common-mode voltage (CMV) is proposed. By using the proposed mathematical model, the magnitude of circulating currents, capacitors voltage ripple, and the ripple in DC-link current during balanced and unbalanced operating conditions can be minimized. The modulation scheme and switching frequency are directly affected the output power quality and the performance of the converter and control method. In this dissertation, a novel sampled average and space vector modulation scheme is proposed. These modulation schemes are suitable to control the MMC with any number of submodules (without modifications), operates at low switching frequency, minimizes the ripple in output current and voltage harmonic distortion, and reduces the output filter size. For reliable operation of MMC, the voltage balancing among submodules is mandatory. This dissertation proposes a generalized single-stage balancing approach with reduced current sensors to control the MMC. The proposed balancing approach is suitable to implement with both phase-shifted and level-shifted pulse width modulation schemes. With the proposed approach, it is also possible to control the MMC with half-bridge and three level flying capacitor submodules. Also, an improved balancing approach often referred as the dual-stage balancing approach is proposed to minimize the voltage harmonic distortion and device power losses. This dissertation also proposes a direct model predictive control (D-MPC) approach to minimize the ripple in submodule capacitors voltage. To implement D-MPC approach, a discrete-time model of MMC with CMV is proposed. With the use of proposed model, the D-MPC approach does not require a cost function to minimize the circulating currents. The computational complexity is one of the major issues in the implementation of D-MPC approach for MMC. In this dissertation, a novel reduced computational MPC approaches named as dual-stage D-MPC and indirect model predictive control (I-MPC) approach are proposed. These approaches significantly minimize the computational complexity and, improve the voltage and current waveform quality while operating at the low switching frequency. Finally, the simulation and experimental studies are presented to validate the dynamic and steady-state performance of proposed methodologies. Index Terms • Modular Multilevel Converters. • Capacitors Voltage Balancing. • Pulse Width Modulation Schemes. • Circulating Currents. • Capacitors Voltage Ripple • Direct Model Predictive Control. • Dual-Stage Direct Model Predictive Control. • Indirect Model Predictive Control. • Total Harmonic Distortion.

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