scholarly journals Modified Venturini Modulation Method for Matrix Converter Under Unbalanced Input Voltage Conditions

2019 ◽  
Vol 17 (1) ◽  
pp. 60-68
Author(s):  
Neerakorn Jarutus ◽  
Yuttana Kumsuwan
Keyword(s):  
Control Strategy ◽  
Input Voltage ◽  
Matrix Converter ◽  
Modulation Method ◽  
Energy Storage Devices ◽  
Two Phase ◽  
Storage Devices ◽  
Voltage Unbalance ◽  
Phase Condition ◽  
The Matrix

Based on Venturini method, it is in favor of the modulation technique for controlling the matrix converter due to only use of the comparison between the duty cycles in time domain and the triangular carrier wave for generating the gating signals and the achievable voltage ratio between fundamental output magnitude and fundamental input magnitude to 0.866. However, even with simple modulation method and achieving maximum fundamental output magnitude, the possible input voltage unbalance conditions accordingly influence on the output performances (more reduction and distortion). Thus, a control strategy based on Venturini method is presented in this paper, in order to solve the impacts of unbalanced input voltage conditions on the matrix converter performances. Conceptually, this strategy is done by modifying the mathematical model for controlling the modulating waves to satisfy the desirable feature, as generated in the event of normal situation. Up to this approach, it can support either single-phase condition or two-phase condition. Performance of the proposed control strategy was verified by the simplified simulation model in the MATLAB/Simulink software. It is clearly shown that the matrix converter can be controlled for regulating the balanced output voltages with showing good steady-state and dynamic operations without the energy storage devices.

scholarly journals Modified Venturini Modulation Method for Matrix Converter under Unbalanced Input Voltage Conditions

2018 ◽  
Author(s):  
Neerakorn Jarutus ◽  
Yuttana Kumsuwan
Keyword(s):  
Single Phase ◽  
Input Voltage ◽  
Matrix Converter ◽  
Modulation Method ◽  
Two Phase ◽  
Voltage Unbalance ◽  
Duty Cycles ◽  
Phase Condition ◽  
Desirable Feature ◽  
The Matrix

Based on Venturini method, it is in favor of the modulation technique for controlling the matrix converter due to only use of the comparison between the duty cycles in time domain and the triangular carrier wave for generating the gating signals and the achievable voltage ratio between fundamental output magnitude and fundamental input magnitude to 0.866. However, even with simple modulation method and achieving maximum fundamental output magnitude, the possible input voltage unbalance conditions accordingly influence on the output performances (more reduction and distortion). Thus, a modified Venturini modulation method is presented in this paper, in order to solve the problems of unbalanced input voltage conditions on the matrix converter performances. The proposed strategy is to satisfy the desirable feature of the duty cycle modulating waves, as generated in the event of normal situation. Up to this approach, it can support either single-phase condition or two-phase condition. Performance of the proposed control strategy was verified by the simulated implementation in the MATLAB/Simulink software with showing good steady-state and dynamic operations.

ADDITIVE MANUFACTURING OF HIGH-LOADING POLYMER NANOCOMPOSITES WITH MULTISCALE ALIGNMENT

2021 ◽  
Author(s):  
SOYEON PARK ◽  
KUN (KELVIN) FU
Keyword(s):  
Additive Manufacturing ◽  
Polymer Nanocomposites ◽  
High Performance ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
High Productivity ◽  
Macro Scale ◽  
The Matrix ◽  
Multiscale Structures ◽  
Printing Direction

Polymer nanocomposites have advantages in mechanical, electrical, and optical properties compared to individual components. These unique properties of the nanocomposites have attracted attention in many applications, including electronics, robotics, biomedical fields, automotive industries. To achieve their high performance, it is crucial to control the orientation of nanomaterials within the polymer matrix. For example, the electric conductivity will be maximized in the ordered direction of conductive nanomaterials such as graphene and carbon nanotubes (CNTs). Conventional fabrication methods are commonly used to obtain polymer nanocomposites with the controlled alignment of nanomaterials using electric or magnetic fields, fluid flow, and shear forces. Such approaches may be complex in preparing a manufacturing system, have low fabrication rate, and even limited structure scalability and complexity required for customized functional products. Recently, additive manufacturing (AM), also called 3D printing, has been developed as a major fabrication technology for nanocomposites with aligned reinforcements. AM has the ability to control the orientation of nanoparticles and offers a great way to produce the composites with cost-efficiency, high productivity, scalability, and design flexibility. Herein, we propose a manufacturing process using AM for the architected structure of polymer nanocomposites with oriented nanomaterials using a polylactic acid polymer as the matrix and graphite and CNTs as fillers. AM can achieve the aligned orientation of the nanofillers along the printing direction. Thus, it enables the fabrication of multifunctional nanocomposites with complex shapes and higher precision, from micron to macro scale. This method will offer great opportunities in the advanced applications that require complex multiscale structures such as energy storage devices (e.g., batteries and supercapacitors) and structural electronic devices (e.g., circuits and sensors).

Research on a Novel Non Dead-Time Compensation Two-Phase Modulation SVPWM Control Strategy

2012 ◽  
Vol 546-547 ◽  
pp. 1050-1055
Author(s):  
Bao Lian Liu ◽  
De Fei Jin
Keyword(s):  
Control Strategy ◽  
Phase Modulation ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Dead Time ◽  
Modulation Method ◽  
Two Phase ◽  
Switching Losses ◽  
Dead Time Compensation ◽  
Switching State

A space vector pulse-width modulation (SVPWM) strategy was developed to solve the failure of traditional SVPWM. A two-phase modulation method is adopted basing on the analyses of traditional SVPWM to select the null switching state in each sector according to the power factor angle. As a result, when the current is crossing zero, the corresponding phase does not commute and dead-time compensation is avoided; and when the current is nearing the peak, the corresponding phase also don’t commute, which leads to lower switching losses. The simulation and experimental results validate that the proposed strategy can effectively improve the current wave, minimize the current distortion and reduce the switching losses. Furthermore, the algorithm is easy to implement.

scholarly journals Justification of the Parameters of a DC/DC Converter for an Autonomous Power Supply Source

2020 ◽  
Vol 20 (4) ◽  
pp. 86-95
Keyword(s):  
Power Supply ◽  
Electric Power Industry ◽  
Active Phase ◽  
Input Voltage ◽  
Energy Storage Devices ◽  
Supply Source ◽  
Power Sources ◽  
Storage Devices ◽  
Voltage Change ◽  
Power Supply Source

As the Smart Grid concept has become a part of the electric power industry development, DC/DC conver­ters have turned into a matter of increased interest. This is due to their effective coordination in the DC-bus system operating different types of power sources, including renewable ones and energy storage devices (batteries, supercapacitor modules), and various loads. The article analyzes switch mode power supply DC/DC converters for autonomous power supply systems. The application of the SEPIC (Single Ended Primary Inductance Converter) type converter is substantiated. The techniques of determining the parameters of the converter are presented. The active phase at the duty cycle operation has been demonstrated, and justified in accordance with the theoretical behavior in response to an input voltage change above and below the desired output value. A simulation of the converter's operation in the buck and boost modes in order to stabilize the output voltage at a set level has been performed in the MATLAB / Simulink package. The obtained simulation results show the effectiveness of the suggested solution for an autonomous power supply source.

scholarly journals Performance Improvement of Matrix Converter Direct Torque Control System

Energies ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 3247
Author(s):  
Bowei Zou ◽  
Yougui Guo ◽  
Xi Xiao ◽  
Bowen Yang ◽  
Xiao Wang ◽  
...  
Keyword(s):  
Control Strategy ◽  
Control Method ◽  
Asynchronous Motor ◽  
Direct Torque Control ◽  
Torque Ripple ◽  
Matrix Converter ◽  
Torque Control ◽  
Theoretical Simulation ◽  
Existing Problems ◽  
The Matrix

In asynchronous motor direct torque control systems, the power supply using the matrix converter can achieve the effect of direct torque control and also has the advantages of the matrix converter. Nonetheless, direct torque control still has drawbacks in terms of pulsation. In this paper, the characteristics of direct torque control method and its existing problems are analyzed in depth. In view of the shortcomings of torque ripple, an improved scheme of torque tracking control is proposed based on conventional control methods. On the basis of theoretical simulation, DSP and FPGA algorithms are designed respectively in C language and VHDL to implement the proposed control strategy. Finally, a highly integrated experimental platform of matrix converter has been developed to verify the proposed control strategy. The simulation and experimental results verify the correctness and effectiveness of the improved scheme.

scholarly journals Elimination of Common Mode Voltage in Three-To-Six-Phase Matrix Converter

Energies ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1662 ◽  
Author(s):  
Janina Rząsa ◽  
Elżbieta Sztajmec
Keyword(s):  
Pulse Width Modulation ◽  
Electronic System ◽  
Matrix Converter ◽  
Modulation Method ◽  
Common Mode ◽  
Common Mode Voltage ◽  
M Phase ◽  
The Matrix ◽  
Displacement Angle ◽  
Vector Modulation

The matrix converter (MC) is the n-phase input and m-phase output power electronic system. To synthesis the controllable sinusoidal output voltage and input current with controllable input displacement angle, the pulse width modulation method (PWM) is used in the MC. During the modulation process a problem of the common mode voltage (CMV) exists. The elimination of the CMV in three-to-six-phase MC by usage of only rotating voltage space vectors is analyzed in the paper. The carrier based implementation of the space vector modulation (SVM) with Venturini modulation functions is applied to the control of the three-to-six-phase MC. Entire elimination of the CMV in three-to-six-phase MC is presented in the paper. The simulation and experiment results confirm utility of the proposed modulation method.

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