Comparison Between Two-Level and Modular Multilevel Converters in High Voltage Direct Current Systems Under Fault Conditions

2021 ◽  
Author(s):  
Mikaela T. M. Barra ◽  
Maxwel S. Santos ◽  
Victor R. F. B. de Souza ◽  
Flavio B. Costa ◽  
Luciano S. Barros ◽  
...  
Keyword(s):  
High Voltage ◽  
Direct Current ◽  
Multilevel Converters ◽  
High Voltage Direct Current ◽  
Modular Multilevel Converters ◽  
Current Systems

scholarly journals Modeling and Enhanced Control of Hybrid Full Bridge–Half Bridge MMCs for HVDC Grid Studies

Energies ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 180 ◽  
Author(s):  
Ricardo Vidal-Albalate ◽  
Jaume Forner
Keyword(s):  
Steady State ◽  
Dynamic Response ◽  
High Voltage ◽  
Direct Current ◽  
Simplified Models ◽  
Multilevel Converters ◽  
Electromagnetic Transient ◽  
High Voltage Direct Current ◽  
Modular Multilevel Converters ◽  
Different Types

Modular multilevel converters (MMCs) are expected to play an important role in future high voltage direct current (HVDC) grids. Moreover, advanced MMC topologies may include various submodule (SM) types. In this sense, the modeling of MMCs is paramount for HVDC grid studies. Detailed models of MMCs are cumbersome for electromagnetic transient (EMT) programs due to the high number of components and large simulation times. For this reason, simplified models that reduce the computation times while reproducing the dynamics of the MMCs are needed. However, up to now, the models already developed do not consider hybrid MMCs, which consist of different types of SMs. In this paper, a procedure to simulate MMCs having different SM topologies is proposed. First, the structure of hybrid MMCs and the modeling method is presented. Next, an enhanced procedure to compute the number of SMs to be inserted that takes into account the different behavior of full-bridge SMs (FB-SMs) and half-bridge submodules (HB-SMs) is proposed in order to improve the steady-state and dynamic response of hybrid MMCs. Finally, the MMC model and its control are validated by means of detailed PSCAD simulations for both steady-state and transients conditions (AC and DC faults).

scholarly journals Control-Induced Time-Scale Separation for Multiterminal High-Voltage Direct Current Systems Using Droop Control

2020 ◽  
Vol 28 (3) ◽  
pp. 967-983 ◽  
Author(s):  
Yijing Chen ◽  
Miguel Jimenez Carrizosa ◽  
Gilney Damm ◽  
Francoise Lamnabhi-Lagarrigue ◽  
Ming Li ◽  
...  
Keyword(s):  
High Voltage ◽  
Direct Current ◽  
Time Scale ◽  
Droop Control ◽  
Scale Separation ◽  
High Voltage Direct Current ◽  
Time Scale Separation ◽  
Current Systems
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