scholarly journals Design and implementation of multilevel non-isolated DC-DC converter for variable DC voltage source

2021 ◽  
Vol 12 (2) ◽  
pp. 994
Author(s):  
Ali Ahmed Adam Ismail ◽  
A. Elnady
Keyword(s):  
Power Converter ◽  
Buck Converter ◽  
Voltage Source ◽  
Stable Operation ◽  
Multilevel Converter ◽  
Medium Voltage ◽  
Voltage Stress ◽  
Filter Size ◽  
Converter Topology ◽  
Lc Filter

<span lang="EN-US">In this paper, a non-isolated multi-level DC-DC (MLDC-DC) smooth buck converter with the LC filter is designed and analyzed. The presented topology can be used in low or medium voltage levels in several applications that use DC storage elements. The use of the proposed multilevel converter topology reduces the voltage stress across the power converter switching elements and facilitates the voltage rating of the switches. The designed LC filter for the multilevel converter is characterized by a small inductor size, which reduces the traditional bulky inductor used in the output of the traditional DC-DC converter. The reduction in the filter size is proportional to the number of the connected voltage sources, it works effectively to reduce ripple in the load currents, and it increases the voltage gain. The intensive analysis of the converter system and the experimental results show a stable operation of the proposed converter with precise output voltage.</span>

scholarly journals Reduced Switch Multilevel Inverter Topologies And Modulation Techniques For Renewable Energy Applications

2021 ◽  
Vol 12 (3) ◽  
pp. 4659-4670
Author(s):  
Ujwala Gajula Et.al
Keyword(s):  
Renewable Energy ◽  
Renewable Energy Sources ◽  
Harmonic Distortion ◽  
Power Converter ◽  
Multilevel Inverter ◽  
Medium Voltage ◽  
Multilevel Inverters ◽  
Energy Applications ◽  
Converter Topology ◽  
Overall Performance

Multilevel inverters (MLIs) have been extensively used and gained interest over last few decades in industrial and grid connected renewable energy applications because of its numerous merits. Besides various advantages like obtaining reduced harmonic distortion and lesser dv/dt stress across switches it has the capability of generating any number of levels. The theory of multilevel concept was initiated for high power and high/medium voltage applications as they are helpful in interfacing with renewable energy sources. By proper combination of the switches it generates a stair case output with reduced harmonic distortion because of this MLI is widely used and it became one of the advanced power converter topology. The rise of new topologies has attained importance over conventional multilevel inverter topologies, which generates more number of levels with reduced switch components. This paper presents various conventional MLI topologies and hybrid MLI topologies for renewable energy applications. Also, this review paper includes different modulation strategies which plays an important role to improve the overall performance of MLI.

A Review on Designand Control Methods of Modular Multilevel Converter

2016 ◽  
Vol 7 (3) ◽  
pp. 863
Author(s):  
Ramya G ◽  
Ramaprabha R
Keyword(s):  
High Voltage ◽  
High Efficiency ◽  
Motor Drives ◽  
Voltage Source ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Multilevel Converters ◽  
Power Sources ◽  
Modular Multilevel Converters ◽  
Converter Topology

Modular multilevel converters (MMC) are an emerging voltage source converter topology suitable for many applications. Due to abundant utilization of HVDC power transmission, the modular multilevel converter has become popular converter type to be used in high voltage applications. Other applications include interfacing renewable energy power sources to the grid and motor drives. Modular multilevel converters are beneficial for high voltage and high power motor drives because of the properties of this converter topology, such as, low distortion, high efficiency, etc. For the past few years significant research has been carried out to address the technical challenges associated with operation and voltage balancing of MMC. In this paper, a detailed technical review on the control strategies is presented for ready reference.

Research on the Voltage Balance Strategy of Modular Multilevel Converter

2014 ◽  
Vol 1055 ◽  
pp. 157-160
Author(s):  
Ji Min Jing ◽  
Jing Ze Wang ◽  
Yan Chao Ji
Keyword(s):  
Control Strategies ◽  
Low Frequency ◽  
Voltage Divider ◽  
Voltage Source ◽  
Stable Operation ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Factors Affecting ◽  
Capacitor Voltage ◽  
Voltage Balance

The modular multilevel converter (MMC) does not need clamping devices and multiple independent DC voltage source and has a modular structure which is easy to be extended to any level, share a DC side, easy to direct back to back four-quadrant operation and attracts widespread attention. Due to the use of sub-module MMC suspended on the DC side capacitor voltage divider provides synthetic AC output voltage required voltage level and therefore it is essential to the stable operation of the sub-module capacitor voltage balance of the MMC. In this paper, the factors affecting the MMC sub-module capacitor voltage balancing has been carried out a detailed analysis and this paper focuses on the nominal frequency erupted module capacitor voltage control strategies and the average low frequency sub-module capacitor voltage ripple suppression strategies.

scholarly journals Real-Time Hardware in the Loop Simulation Methodology for Power Converters Using LabVIEW FPGA

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 373 ◽  
Author(s):  
Leonel Estrada ◽  
Nimrod Vázquez ◽  
Joaquín Vaquero ◽  
Ángel de Castro ◽  
Jaime Arau
Keyword(s):  
Power Electronics ◽  
Real Time ◽  
High Speed ◽  
Power Converter ◽  
Buck Converter ◽  
Voltage Source ◽  
Hardware In The Loop ◽  
Power Electronics Converters ◽  
Labview Fpga ◽  
Hil Simulation

Nowadays, the use of the hardware in the loop (HIL) simulation has gained popularity among researchers all over the world. One of its main applications is the simulation of power electronics converters. However, the equipment designed for this purpose is difficult to acquire for some universities or research centers, so ad-hoc solutions for the implementation of HIL simulation in low-cost hardware for power electronics converters is a novel research topic. However, the information regarding implementation is written at a high technical level and in a specific language that is not easy for non-expert users to understand. In this paper, a systematic methodology using LabVIEW software (LabVIEW 2018) for HIL simulation is shown. A fast and easy implementation of power converter topologies is obtained by means of the differential equations that define each state of the power converter. Five simple steps are considered: designing the converter, modeling the converter, solving the model using a numerical method, programming an off-line simulation of the model using fixed-point representation, and implementing the solution of the model in a Field-Programmable Gate Array (FPGA). This methodology is intended for people with no experience in the use of languages as Very High-Speed Integrated Circuit Hardware Description Language (VHDL) for Real-Time Simulation (RTS) and HIL simulation. In order to prove the methodology’s effectiveness and easiness, two converters were simulated—a buck converter and a three-phase Voltage Source Inverter (VSI)—and compared with the simulation of commercial software (PSIM® v9.0) and a real power converter.

scholarly journals An improved model of hybrid multi converter used for grid connected applications

2019 ◽  
Vol 10 (2) ◽  
pp. 860
Author(s):  
E. Catherine Amala Priya ◽  
G. T. Sundar Rajan
Keyword(s):  
High Stability ◽  
High Reliability ◽  
Pi Controller ◽  
Buck Converter ◽  
Voltage Source ◽  
Voltage Converter ◽  
Dc Voltage ◽  
Converter Topology ◽  
Improved Model ◽  
Different Levels

A Hybrid multi converter topology is proposed in this paper, which supplies simultaneous voltage’s for various levels from Renewable energy source. The proposed topology is realized by replacing Multi cuk- buck converter topology. The resultant hybrid multi converter requires less number of switches to operate, as well as various output voltages of different levels without interruption with increased stability. This type of hybrid multi converter with high reliability and high stability are well implemented for loads utilizing various levels of DC voltage. Converter, proposed in this paper is called Hybrid Multi converter topology (HMCT). A study is made on the steady state of the HMCT and a comparative study has been made with the conventional designs. A PI controller based feedback controller is designed to stabilize the various output voltages. A simulated model for the proposed HMCT is used to simulate various output voltages of dissimilar values from mono DC- input. The performance of the converter is demonstrated using simulation model. The proposed design can be protracted to voltage source inverter, multilevel inverter to produce AC output.

scholarly journals A new asymmetric cascaded multilevel converter topology with reduced voltage stress and number of switches

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Rahim Samanbaksh ◽  
Federico M. Ibanez ◽  
Peyman Koohi ◽  
Fernando Martin
Keyword(s):  
Multilevel Converter ◽  
Voltage Stress ◽  
Converter Topology

scholarly journals On the Development of High Power DC-DC Step-Down Converter with Energy Recovery Snubber

2012 ◽  
Vol 2012 ◽  
pp. 1-10
Author(s):  
Alok Singh ◽  
Mangesh B. Borage ◽  
Sunil R. Tiwari ◽  
A. C. Thakurta
Keyword(s):  
High Power ◽  
Energy Recovery ◽  
Design Procedure ◽  
Power Converter ◽  
Buck Converter ◽  
Dual Function ◽  
Turn On ◽  
Switching Losses ◽  
Voltage Stress ◽  
Diode Voltage

The effect of switching losses on the efficiency of a switch mode power converter and methods adopted for its improvement using an energy recovery lossless snubber has been presented. A comparative analysis of various types of soft switching techniques along with effects of dissipative and nondissipative snubbers on efficiency of the converter has been carried out before zeroing in on the selected scheme. The selected snubber serves the dual function of a turn-on and turn-off snubber and thereby reducing the switching losses both during turn-on and turn-off transients, resulting in improved efficiency of the converter. A detailed design procedure of the snubber for high-power applications taking into account various effects such as diode reverse recovery, diode voltage stress, and minimum and maximum duty cycle limits, has been presented in this paper. Importance of practical aspects in layout to minimize wiring inductance is also highlighted. A high-power prototype of buck converter has been developed to experimentally validate the theoretical design and analytical observations.

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