scholarly journals Voltage regulation and phase quantity increase of two high-power 12-phase rectifiers

2019 ◽  
Vol 10 (3) ◽  
pp. 1454
Author(s):  
Valery Safonov ◽  
Mikhail Dziuba
Keyword(s):  
High Power ◽  
Harmonic Distortion ◽  
Voltage Regulation ◽  
Total Harmonic Distortion ◽  
New Method ◽  
Matlab Simulink ◽  
Electromagnetic Processes ◽  
The Common

In this article, we present a new method of simultaneously increasing the phase quantity and regulating the rectified voltage for two 12-phase high-power rectifiers operating at a common load. Self-excited voltage inverters separately form the necessary voltages for voltage regulation and for increasing the phase quantity. The formed voltage is input with the help of a common booster transformer. Separating the inverters functions and using the common booster transformer makes it possible to reduce the installed power of the equipment significantly compared to similar circuits when the regulation range of the rectified voltage is up to 5%. Calculations show that the inverter power for increasing the phase quantity is about 3% of the rectifier power. The circuit was modeled in MatLab/Simulink and the electromagnetic processes in the rectifier were studied. The proposed method makes it possible to reduce the total harmonic distortion of the network current and the pulsation coefficient of the rectified voltage to the values typical for 24-phase rectifiers.

scholarly journals Performance Research of Seven Level Multi-Level Inverter with Reduced Switches using Various PWM Techniques

2019 ◽  
Vol 8 (2S8) ◽  
pp. 1149-1154
Keyword(s):  
High Power ◽  
Harmonic Distortion ◽  
Total Harmonic Distortion ◽  
Switching Topology ◽  
Switching Loss ◽  
Medium Voltage ◽  
Switching Losses ◽  
Multi Level ◽  
Low Efficiency ◽  
Performance Research

A inverter is basically a device that usually converts DC to AC voltage without causing any power loss, applicable to only low to medium voltage applications. But in case of medium to high power applications, it has demerits like high switching losses, reduced cost and low efficiency. To overcome these demerits a Multilevel inverter applicable to high voltage and high-power applications which have low total harmonic distortion (THD) is introduced. This paper is mainly focused on seven-level inverter with five switches and four dc sources. with low total harmonic distortion, less switching loss without adding any complexity to the circuit. The switching topology is integrated with various SPWM techniques like Phase Disposition (PD), Phase Opposition Disposition (POD) and Anti Phase Opposition Disposition (APOD). For better performance of the inverter above three PWM techniques will be compared and analyzed to find the low THD configuration. The simulation of switching topology is done by MATLAB/Simulink.

scholarly journals Circuit Structure and Control Method to Reduce Size and Harmonic Distortion of Interleaved Dual Buck Inverter

Energies ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1531
Author(s):  
Min-Gi Cho ◽  
Sang-Hoon Lee ◽  
Hyeon-Seok Lee ◽  
Yoon-Geol Choi ◽  
Bongkoo Kang
Keyword(s):  
Output Power ◽  
High Power ◽  
Control Method ◽  
Power Conversion ◽  
Harmonic Distortion ◽  
Current Mode ◽  
Total Harmonic Distortion ◽  
Current Mode Control ◽  
Circuit Structure ◽  
And Control

A new circuit structure and control method for a high power interleaved dual-buck inverter are proposed. The proposed inverter consists of six switches, four diodes and two inductors, uses a dual-buck structure to eliminate zero-cross distortion, and operates in an interleaved mode to reduce the current stress of switch. To reduce the total harmonic distortion at low output power, the inverter is controlled using discontinuous-current-mode control combined with continuous-current-mode control. The experimental inverter had a power-conversion efficiency of 98.5% at output power = 1300 W and 98.3% at output power = 2 kW, when the inverter was operated at an input voltage of 400 VDC, output voltage of 220 VAC/60 Hz, and switching frequency of 20 kHz. The total harmonic distortion was < 0.66%, which demonstrates that the inverter is suitable for high-power dc-ac power conversion.

Performance Analysis of Cascade H-Bridge Multilevel Inverter Topology With Filter Circuit and Without Filter Circuit

2020 ◽  
pp. 87-101
Author(s):  
Nikhil Agrawal
Keyword(s):  
Performance Analysis ◽  
High Power ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Total Harmonic Distortion ◽  
Medium Voltage ◽  
Number Of Components ◽  
Modulation Techniques ◽  
Driver Circuit ◽  
Inverter Topology

Multilevel inverter is a modified version of inverter. Multilevel inverter recently emerged in the area of high power and medium voltage application. In the last few decades, the great innovation has been done to improve the inverter performance, and it is challenging even today. The multilevel inverter performance is examined by total harmonic distortion and component required. In multilevel, as level increases, the total harmonic distortion value decreases, but the number of components required and driver circuit increases that make the circuit more complex and also the effect on cost. So, the challenge is to balance the bridge between cost and total harmonic distortion. This chapter simulates the various levels of conventional cascade H-bridge inverter and new proposed topology of multilevel inverter with using different modulation techniques and with using filter circuit and without filter circuit.

Enhanced frequency shift carrier modulation for H-bridge multilevel converter to conquer the impact of instability in deputize condenser voltage

2018 ◽  
Vol 57 (2) ◽  
pp. 164-174
Author(s):  
Yuvaraja T ◽  
KA Ramesh Kumar
Keyword(s):  
Frequency Shift ◽  
High Power ◽  
Output Voltage ◽  
Harmonic Distortion ◽  
Total Harmonic Distortion ◽  
Multilevel Converter ◽  
Control Scheme ◽  
Capacitor Voltage ◽  
Nonlinear Compensation ◽  
The Impact

H-bridge multilevel converter is the most challenging topology from nominal to high power applications. However, when the energy is exchanged between AC side and DC side or vice versa, the fluctuation in the capacitor used in deputize unit is unavoidable. The fluctuation in the deputize unit is due to the increase in the total harmonic distortion by the capacitor in the output voltages. This total harmonic distortion is evaded by exploring the deputize unit capacitor voltage mathematically. This paper proposes the enhanced frequency shift carrier modulation in H-bridge multilevel converter to suppress the influence of fluctuation in deputize unit capacitor voltages. Enhanced frequency shift carrier modulation is considered for nonlinear compensation. The principal results of using this enhanced frequency shift carrier modulation improvise the total harmonic distortion in the output voltage of H-bridge multilevel converter. Simulation and experimental results are done using MATLAB/SIMULINK to verify the effectiveness of the proposed control scheme.

scholarly journals Pemodelan Pengaturan Kecepatan Motor Induksi dengan Pulse Widht Modulation dengan Matlab

2019 ◽  
Vol 4 (1) ◽  
pp. 247
Author(s):  
Zainal Abidin
Keyword(s):  
Voltage Regulation ◽  
New Method ◽  
Alternative Methods ◽  
Motor Speed ◽  
Matlab Simulink ◽  
Advantages And Disadvantages ◽  
Regulation Method

Alternative methods and modeling control of motor speed with the voltage regulation method currently used, namely the constant Volt / Hertz method with Pulse With Modulation (PWM) with several advantages and disadvantages and showing possible advantages and disadvantages to achieve the new method compared to the used today.The characteristics of the use of PWM can be studied together with the use of Matlab / Simulink modeling.

scholarly journals Compare the Symmetric Hybridized Cascaded MLI with 17 levels with the Asymmetric Switched Capacitor MLI Topologies for Dynamic Loading

2021 ◽  
Vol 9 (VII) ◽  
pp. 1951-1958
Author(s):  
Jayesh B. Patil
Keyword(s):  
Renewable Energy ◽  
Dynamic Loading ◽  
Output Voltage ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Total Harmonic Distortion ◽  
Switched Capacitor ◽  
Matlab Simulink ◽  
Energy Applications ◽  
Load Disturbance

This article builds a symmetric hybridized cascaded a switching capacitor unit in a multilayer inverter and compares it to For 17 level inverters, A switched capacitor unit is utilized with an asymmetric multilevel inverter. In the symmetric hybridized multilevel inverter design, a In the midst of a dual-input dc source, there is a bi-directional switch is utilized to create a modified H-bridge inverter with a five-level output voltage instead of three. In the proposed scenario, In an asymmetric multilevel inverter, the switched capacitor unit substitutes the dc sources. which enlarges By a factor of two, The output voltage has been increased. and the voltage levels at the loads are increased by a factor of two. MATLAB-SIMULINK was used to verify the suggested topology using the staircase modulation approach. The findings show that multilayer inverter topologies with low total harmonic distortion, fewer switches, With greater levels of output voltage are better stable during load disturbance circumstances, making them ideal for renewable energy applications.

scholarly journals A 129-level Asymmetrical Cascaded H-Bridge Multilevel Inverter with Reduced Switches and Low THD

2021 ◽  
Vol 9 (8) ◽  
pp. 1982-1989
Author(s):  
Manoj H P
Keyword(s):  
Comparative Analysis ◽  
High Power ◽  
Power Conversion ◽  
Harmonic Distortion ◽  
Alternating Current ◽  
Current Level ◽  
Multilevel Inverter ◽  
Total Harmonic Distortion ◽  
Voltage Reference ◽  
Voltage Ratio

Abstract: The multilevel inverter is a power conversion device which is uses multiple dc sources to provide required alternating current level. It is can be used for medium to high power applications. This paper presents a 129 level asymmetrical cascaded Hbridge multilevel inverter with reduced switching components and higher THD. The proposed inverter uses multiple dc sources with voltage ratio 1:1:2:4:8:16:32. The proposed inverter uses voltage reference technique to control the switching components of the topology. The comparative analysis of 129 level ASCHBMLI and conventional inverter topologies have been presented. The main advantages of the proposed topology is lower switching components, lower losses, and lower THD without the need of filter. MATLAB/SIMULINK software is used to perform simulation and analyse the performance of the proposed topology. Keywords: Multilevel Inverter (MLI), Asymmetrical Cascaded H Bridge Multilevel Inverter (ASCHBMLI), Cascaded H Bridge (CHB), MATLAB, Total Harmonic Distortion (THD).

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