scholarly journals Operation and Control of a Seven-Level V-Clamp Multilevel Converter

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4761
Author(s):  
Yao Xue ◽  
Xiaofeng Yang ◽  
Lutian Yuan ◽  
Trillion Q. Zheng
Keyword(s):  
Power Conversion ◽  
Modulation Method ◽  
Multilevel Converter ◽  
Multilevel Converters ◽  
Output Performance ◽  
Flying Capacitors ◽  
Dynamic Voltage ◽  
Set Up ◽  
And Control ◽  
Laboratory Prototype

Multilevel converters are well suited for high-power and high-quality power conversion. This paper presents a new seven-level V-clamp multilevel converter (VMC) with reduced clamping devices. All phases of the VMC share common DC-link capacitors and realize bidirectional power conversion without flying capacitors. Each branch of the VMC sustains only a single-level voltage of the DC-link capacitors during its commutation process. Hence, the series switches can be controlled as simple as one switch and the dynamic voltage unbalancing issue is avoided. In this paper, the operation principle and the modulation method of the VMC are analyzed in detail. In addition, compensation control for non-ideal factors is designed to improve the output performance. The output fundamental distortion is compensated and the harmonics are reduced. Finally, a laboratory prototype of the seven-level VMC is set up to verify the feasibility of the presented topology and analysis.

scholarly journals Five Level Flying-Capacitor Multilevel Converter Using Dynamic Voltage Restorer (DVR)

2012 ◽  
pp. 166-172
Author(s):  
K. Ramakrishna Reddy ◽  
G. Koti Reddy
Keyword(s):  
Distribution System ◽  
Voltage Regulation ◽  
Matlab Simulation ◽  
Multilevel Converter ◽  
Multilevel Converters ◽  
Dynamic Voltage Restorer ◽  
Voltage Restorer ◽  
Flying Capacitors ◽  
Dynamic Voltage ◽  
Level Converter

This paper deals with dynamic voltage restorer (DVR) controlled by a five-level flying-capacitor multi level converter. To decrease the power-quality disturbances in distribution system, such as voltage imbalances, harmonic voltages, and voltage sags. The organisation of this paper has been divided into three parts; the first one eliminates the modulation high-frequency harmonics using filter increase the transient response. The second one deal with the load voltage; and the third is flying capacitors charged with balanced voltages. The MATLAB simulation results effectively for five level flying capacitor multilevel converters charged with balanced voltage regulation.

scholarly journals Five Level Flying-Capacitor Multilevel Converter Using Dynamic Voltage Restorer (DVR)

2021 ◽  
pp. 1-7
Author(s):  
K. Ramakrishna Reddy ◽  
G. Koti Reddy
Keyword(s):  
Distribution System ◽  
Voltage Regulation ◽  
Matlab Simulation ◽  
Multilevel Converter ◽  
Multilevel Converters ◽  
Dynamic Voltage Restorer ◽  
Voltage Restorer ◽  
Flying Capacitors ◽  
Dynamic Voltage ◽  
Level Converter

This paper deals with dynamic voltage restorer (DVR) controlled by a five-level flying-capacitor multi level converter. To decrease the power-quality disturbances in distribution system, such as voltage imbalances, harmonic voltages, and voltage sags. The organisation of this paper has been divided into three parts; the first one eliminates the modulation high-frequency harmonics using filter increase the transient response. The second one deal with the load voltage; and the third is flying capacitors charged with balanced voltages. The MATLAB simulation results effectively for five level flying capacitor multilevel converters charged with balanced voltage regulation.

scholarly journals Voltage Jump Suppression and Capacitor Voltage Fluctuation Analysis for a Four-Level Hybrid Flying Capacitor T-Type Converter

Energies ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 698 ◽  
Author(s):  
Chen Wei ◽  
Xibo Yuan ◽  
Juan Zhou ◽  
Kangan Wang ◽  
Yonglei Zhang ◽  
...  
Keyword(s):  
Dead Time ◽  
Fluctuation Analysis ◽  
Voltage Fluctuation ◽  
Multilevel Converters ◽  
Medium Voltage ◽  
Time Period ◽  
Capacitor Voltage ◽  
And Control ◽  
Laboratory Prototype ◽  
Voltage Jump

In low and medium voltage power conversion systems, multilevel converters are becoming more and more attractive due to improved power density. However, the complexity of topology and control is a big challenge for the application of multilevel converters. In this paper, a four-level (4L) hybrid flying capacitor (FC) T-type converter has been researched in detail. The topological advantage of the converter is displayed in comparison to existing four-level converters. According to the feature of the topology, the operating status has been analyzed and the reason for the voltage jump is researched in detail during the dead-time period. A strategy to reduce voltage jump by adjusting the switching states has be presented. The FC voltages can be balanced by selecting the appropriate switching states. The relationships between the fluctuations of FC voltages and the modulation index and power factor (PF) have been analyzed by simulation results. The performance of the 4L converter has been investigated in MATLAB/Simulink as well as on a down-scaled laboratory prototype.

scholarly journals Hybrid Multilevel Converters: Topologies, Evolutions and Verifications

Energies ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 615 ◽  
Author(s):  
Jianzhong Zhang ◽  
Shuai Xu ◽  
Zakiud Din ◽  
Xing Hu
Keyword(s):  
High Voltage ◽  
Control Strategies ◽  
Multilevel Converter ◽  
Power Devices ◽  
Multilevel Converters ◽  
Voltage Balancing ◽  
In Series ◽  
Good Potential ◽  
And Control ◽  
Balancing Control

Multilevel converters have good potential in high power and high voltage applications due to their advantages of reduced voltage or current stress on power devices. In recent years, hybrid multilevel converter (HMC) have attracted increasing attention since less equipment is required. In this paper, the topologies and evolutions of HMCs are presented, where five topology derivation ways are given by using basic cells in series-parallel/parallel-series. Some general topologies or structures that are used to generate higher levels are also deducted. Then many existing HMCs can be derived, and new topologies of the HMC might be inspired. The capabilities of neutral point and FC voltage balancing control are investigated. The performance of the selected FC-based HMCs is analyzed. Finally, the verifications of operation principle and control strategies for the derived HMCs are carried out.

Continuous PWM Modulation Strategy for NPC/H and H Bridge Hybrid Multilevel Converter

2013 ◽  
Vol 748 ◽  
pp. 510-513
Author(s):  
Hong Zheng ◽  
Yue Lei Shi ◽  
Hang Hui Zhang
Keyword(s):  
Control Strategy ◽  
Output Voltage ◽  
Supply Voltage ◽  
Matlab Simulation ◽  
Multilevel Converter ◽  
Multilevel Converters ◽  
Voltage Variation ◽  
Slave Converter ◽  
And Control

f the ratio of NPC/H and H bridge hybrid multilevel converters DC supply voltage changed, the output voltage PWM waveform will be discontinuous. Thus an improved topology and control strategy is proposed. In new method, master converter operates at the fundamental frequency based on command voltage, slave converter adopts carrier phase shifted PWM technology (CPS-SPWM) at a higher frequency to enhance the quality of output voltage waveform. The amplitude of command voltage is higher than output voltage amplitude of the master converter at any time, to ensure that output voltage variation of both converters keeps in the same direction without any current flow backwards. Matlab simulation results demonstrate the effectiveness of the proposed control strategy and topology.

scholarly journals Selected aspects of Modular Multilevel Converter operation

2014 ◽  
Vol 62 (2) ◽  
pp. 375-385 ◽  
Author(s):  
M. Zygmanowski ◽  
B. Grzesik ◽  
M. Fulczyk ◽  
R. Nalepa
Keyword(s):  
Modulation Method ◽  
Special Focus ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Main Subject ◽  
Direct Modulation ◽  
And Control ◽  
Averaged Model

Abstract The operation of the Modular Multilevel Converter (MMC) is the main subject of this paper. Selected operation aspects are discussed on the basis of the averaged model, with a special focus on power section parameters and control. The direct modulation method has been chosen for the control of the MMC.

A Novel SHE Modulation Method for Modular Multilevel Converter (MMC) with Reduced Switching Frequency

2013 ◽  
Vol 313-314 ◽  
pp. 337-340
Author(s):  
Xiao Xiao Ma ◽  
Ping Wang
Keyword(s):  
High Power ◽  
Power Conversion ◽  
Modulation Method ◽  
Switching Frequency ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Simulated Model ◽  
Converter Topology ◽  
Simulation Results

Modular multilevel converter (MMC) is one of the most attractive converter topology intended for high power conversion without transformer. In this paper, a new modulation method for MMC is proposed and verified by simulated model. The main advantage of reduced switching frequency is also proved in the simulation results.

scholarly journals Wielopoziomowe przekształtniki energoelektroniczne – topologie, zasada działania, metody modulacji

2020 ◽  
pp. 5-18
Author(s):  
Anna Czmil ◽  
Keyword(s):  
General Structure ◽  
Control Loop ◽  
Power Losses ◽  
Multilevel Converter ◽  
Multilevel Converters ◽  
Modulation Technique ◽  
Modulation Methods ◽  
And Control ◽  
Hybrid Converters ◽  
Made In

In this paper selected issues concerning topological structure, operation and control as well as modulation methods used in multilevel converters are presented. There is reviewed general topologies of multilevel converters, which include Diode-Clamped Converters, Capacitor-Clamped Converters, Cascade Converters and Hybrid Converters. The general structure of a multilevel converter consisting of several stages depending on its application and topology is described. In the structure of operation, the stages of Outer Control Loop, Inner Control Loop, DC voltage stabilization and modulation are specified. Next, the division of modulation methods used in multilevel converters is presented and a detailed description of selected modulation methods is made. In the further part of the article the modulation methods were described in detail, i.e. the Level-Shifted Carrier Modulation Technique and Phase-Shifted Carrier Modulation Technique were used to present the analysis of power losses in multilevel converters.

scholarly journals Small Scale Modular Multilevel Converter for Multi Terminal DC Networks Applications: System Control Validation

2018 ◽  
Author(s):  
Elie Talon Louokdom ◽  
Serge Gavin ◽  
Daniel Siemaszko ◽  
Frédéric Biya-Motto ◽  
Bernard Essimbi Zobo ◽  
...  
Keyword(s):  
Control Strategies ◽  
System Level ◽  
Small Scale ◽  
System Control ◽  
Digital Control System ◽  
Multilevel Converter ◽  
Multilevel Converters ◽  
Modular Multilevel Converters ◽  
Set Up ◽  
Reduced Scale

This paper presents the design and implementation of a digital control system for modular multilevel converters (MMC) and its use in a 5-kW small scale prototype. To achieve higher system control reliability and multi-functionality, the proposed architecture has been built with an effective split of the control tasks between a master controller and six slave controllers, one for each of the six arms of the converter. The MMC prototype have been used for testing both converter and system level controls in a reduced scale laboratory set up of a Multi-Terminal DC transmission network (MTDC). The whole control has been tested in order to validate the proposed control strategies. The tests performed at system level allowed to explore the advantages of using an MMC in a MTDC system.

scholarly journals Small Scale Modular Multilevel Converter for Multi Terminal DC Networks Applications: System Control Validation

2018 ◽  
Author(s):  
Elie Talon Louokdom ◽  
Serge Gavin ◽  
Daniel Siemaszko ◽  
Frédéric Biya-Motto ◽  
Bernard Essimbi Zobo ◽  
...  
Keyword(s):  
Control Strategies ◽  
System Level ◽  
Small Scale ◽  
System Control ◽  
Digital Control System ◽  
Multilevel Converter ◽  
Multilevel Converters ◽  
Modular Multilevel Converters ◽  
Set Up ◽  
Reduced Scale

This paper presents the design and implementation of a digital control system for modular multilevel converters (MMC) and its use in a 5-kW small scale prototype. To achieve higher system control reliability and multi-functionality, the proposed architecture has been built with an effective split of the control tasks between a master controller and six slave controllers, one for each of the six arms of the converter. The MMC prototype have been used for testing both converter and system level controls in a reduced scale laboratory set up of a Multi-Terminal DC transmission network (MTDC). The whole control has been tested in order to validate the proposed control strategies. The tests performed at system level allowed to explore the advantages of using an MMC in a MTDC system.

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