scholarly journals Model-Based Latency Compensation for Network Controlled Modular Multilevel Converters

Electronics ◽  
2018 ◽  
Vol 8 (1) ◽  
pp. 22 ◽  
Author(s):  
Tomás Corrêa ◽  
Francisco Rodríguez ◽  
Emilio Bueno
Keyword(s):  
Digital Communication ◽  
Communication Protocol ◽  
Dynamic Performance ◽  
Sampling Rate ◽  
Sampling Frequency ◽  
Control Performance ◽  
Multilevel Converters ◽  
Model Based ◽  
Modular Multilevel Converters ◽  
And Control

The use of an internal digital communication network enhances the scalability, implementation and maintenance of Modular Multilevel Converters (MMC). However, it also introduces delays that limit the sampling frequency and the controller dynamic performance. In this paper, we propose a model-based predictor to compensate for the loop delay and overcome these limitations. Two benefits of this approach are possible: either designers can increase the sampling rate and control performance or employ a slower communication protocol/technology. In this paper, we present the mathematical description of the model-based predictor, assess the parameter sensitivity, and show matching simulation and experimental results that validate it. As constraints introduced by the use of digital communications are overcome, the results achieved encourage engineers to adopt a network into the design of Modular Multilevel Converters.

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 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 A Reverse Model Predictive Control Strategy for a Modular Multilevel Converter

Energies ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 297 ◽  
Author(s):  
Weide Guan ◽  
Shoudao Huang ◽  
Derong Luo ◽  
Fei Rong
Keyword(s):  
Computational Complexity ◽  
Model Predictive Control ◽  
Predictive Control ◽  
Control Performance ◽  
Multilevel Converter ◽  
Multilevel Converters ◽  
Computational Burden ◽  
Modular Multilevel Converters ◽  
The Cost ◽  
Fast Dynamic

In recent years, modular multilevel converters (MMCs) have developed rapidly, and are widely used in medium and high voltage applications. Model predictive control (MPC) has attracted wide attention recently, and its advantages include straightforward implementation, fast dynamic response, simple system design, and easy handling of multiple objectives. The main technical challenge of the conventional MPC for MMC is the reduction of computational complexity of the cost function without the reduction of control performance of the system. Some modified MPC scan decrease the computational complexity by evaluating the number of on-state sub-modules (SMs) rather than the number of switching states. However, the computational complexity is still too high for an MMC with a huge number of SMs. A reverse MPC (R-MPC) strategy for MMC was proposed in this paper to further reduce the computational burden by calculating the number of inserted SMs directly, based on the reverse prediction of arm voltages. Thus, the computational burden was independent of the number of SMs in the arm. The control performance of the proposed R-MPC strategy was validated by Matlab/Simulink software and a down-scaled experimental prototype.

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 Current Balancing Control for Interleaved Half-Bridge Submodules in Modular Multilevel Converters

2021 ◽  
Author(s):  
Aleksandr Viatkin ◽  
Mattia Ricco ◽  
Riccardo Mandrioli ◽  
Tamas Kerekes ◽  
Remus Teodorescu ◽  
...  
Keyword(s):  
Dynamic Performance ◽  
Experimental Tests ◽  
Current Control ◽  
System Response ◽  
Loop Current ◽  
Multilevel Converters ◽  
Voltage Balancing ◽  
Modular Multilevel Converters ◽  
Capacitor Voltage ◽  
Balancing Control

This paper presents a closed-loop current balancing control for Modular Multilevel Converters with Interleaved half-bridge Sub-Modules (ISM-MMC). The new control loop solves the well-known problem of proper current balancing among interleaved half-bridge legs in each ISM-MMC submodule while preserving a simple and reliable structure. In addition to that, a novel capacitor voltage balancing strategy for MMCs is developed. The new algorithm contains main advantages of the classical capacitor voltage balancing methods while provides an opportunity to decouple two balancing tasks of ISM-MMC, namely capacitor voltage and interleaved legs current balancing. The proposed control methods feature good dynamic performance and are compliant with a digital processor's operational constraints. The effectiveness of the new balancing methods was verified during extensive numerical simulations and experimental tests on a laboratory prototype by the corresponding system response under the input/output characteristics variation and interleaved current control perturbation.

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