scholarly journals Triac Based Novel Single Phase Step-Down Cycloconverter with Reduced THDs for Variable Speed Applications

2021 ◽  
Vol 11 (18) ◽  
pp. 8688
Author(s):  
Tariqul Islam ◽  
Hady H. Fayek ◽  
Eugen Rusu ◽  
Fayzur Rahman
Keyword(s):  
Electromagnetic Interference ◽  
Frequency Conversion ◽  
Pulse Width Modulation ◽  
Power Conversion ◽  
Conversion Process ◽  
Variable Speed ◽  
Phase Step ◽  
Ac Power ◽  
Simulation Results ◽  
Step Down

In variable speed applications, the cycloconverter-based AC to AC power conversion technique has gained more attention among researchers and academics than the traditional rectifier-inverter-based AC to AC power conversion process. The conventional rectifier-inverter-based AC to AC power conversion process has several disadvantages. It uses multi-power stages that increase the converter power conversion losses and increase the cost, volume, and weight of power losses. Besides high conduction and switching losses, the electromagnetic interference problems also accompany the above issues. In this regard, this paper proposes a novel step-down Triac based cycloconverter for variable speed control applications. The proposed topology uses only five Triac devices for one-third and one-fourth frequency conversion of 50 Hz with reduced total harmonics distortion without using any pulse width modulation techniques. The proposed model is designed in the MATLAB/SIMULINK environment. The simulation results show that around 18.85% and 23.67% of total harmonics distortions are reduced in the proposed converter for one-third and one-fourth frequency conversion of 50 Hz, respectively. Two physical experiments are carried out to prove the validity of the simulation results.

scholarly journals A New Generalized Step-Down Single-Stage AC/AC Power Converter

2020 ◽  
Vol 12 (21) ◽  
pp. 9181
Author(s):  
Md. Shihab Uddin ◽  
Shuvra Prokash Biswas ◽  
Md. Rabiul Islam ◽  
Md. Shamim Anower ◽  
Abbas Z. Kouzani ◽  
...  
Keyword(s):  
Pulse Width Modulation ◽  
Power Conversion ◽  
Power Converter ◽  
Single Stage ◽  
Switching Losses ◽  
Multi Stage ◽  
Ac Power ◽  
Modulation Techniques ◽  
Converter Topology ◽  
Step Down

Most traditional AC/AC power converters suffer from power quality problems and multi-stage power conversion losses. The rectifier and inverter-based AC/AC converter topology not only increases multi-stage power conversion losses, but also increases the volume, weight, and cost, and decreases the longevity of the converter due to the DC-link capacitor, line filter and electromagnetic interference (EMI) filter. High-frequency (about 10 kHz) switching advanced pulse width modulation techniques are generally used in order to compensate the power quality problems, which increase the switching losses and introduce the EMI problems. In this paper, a new generalized step-down single-stage line-frequency switching AC/AC power converter topology is proposed. The proposed converter uses line-frequency switching, and does not require any pulse width modulation techniques. The proposed topology offers promising performances in terms of lower order harmonics, total harmonic distortion, the elimination of DC-link capacitors and EMI filters, and switching losses. The circuit was designed and simulated in a MATLAB/Simulink environment. A scaled-down laboratory prototype of the proposed topology was developed in order to validate the feasibility. The experimental and simulation results reveal the feasibility of the proposed generalized step-down single-stage converter topology, and its excellent features.

Comparison of Multicarrier PWM Techniques for Cascaded H-Bridge Multilevel Inverter

2017 ◽  
Vol 8 (2) ◽  
pp. 861 ◽  
Author(s):  
Hashim Hasabelrasul ◽  
Xiangwu Yan
Keyword(s):  
High Power ◽  
Pulse Width ◽  
Output Voltage ◽  
Pulse Width Modulation ◽  
Power Level ◽  
Power Conversion ◽  
Multilevel Inverter ◽  
Multilevel Inverters ◽  
Simulation Results ◽  
Multicarrier Pwm

<p>One of the preferred choices of electronic power conversion for high power applications are multilevel inverters topologies finding increased attention in industry. Cascaded H-Bridge multilevel inverter is one of these topologies reaching the higher output voltage, power level and higher reliability due to its modular topology. Level Shifted Carrier Pulse Width Modulation (LSCPWM) and Phase Shifted Carrier Pulse Width Modulation are used generally for switching cascaded H-bridge (CHB) multilevel inverters. This paper compares LSCPWM and PSCPWM in terms of total harmonics distortion (THD) and output voltage among inverter cells. Simulation for 21-level CHB inverter is carried out in MATLAB/SIMULINK and simulation results are presented.</p>

scholarly journals Opposite Triangle Carrier with SVPWM for Common-Mode Voltage Reduction in Dual Three Phase Motor Drives

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 282
Author(s):  
Seon-Ik Hwang ◽  
Jang-Mok Kim
Keyword(s):  
Electromagnetic Interference ◽  
Pulse Width Modulation ◽  
Motor Drives ◽  
Common Mode ◽  
Pwm Inverter ◽  
Common Mode Voltage ◽  
Voltage Vector ◽  
Three Phase ◽  
The Common ◽  
Zero Voltage

The common-mode voltage (CMV) generated by the switching operation of the pulse width modulation (PWM) inverter leads to bearing failure and electromagnetic interference (EMI) noises. To reduce the CMV, it is necessary to reduce the magnitude of dv/dt and change the frequency of the CMV. In this paper, the range of the CMV is reduced by using opposite triangle carrier for ABC and XYZ winding group, and the change in frequency in the CMV is reduced by equalizing the dwell time of the zero voltage vector on ABC and XYZ winding group of dual three phase motor.

Bridgeless single‐phase step‐down PFC converter

2016 ◽  
Vol 9 (14) ◽  
pp. 2631-2636 ◽  
Author(s):  
Mahdi Malekanehrad ◽  
Ehsan Adib
Keyword(s):  
Single Phase ◽  
Phase Step ◽  
Step Down

scholarly journals Low Order Harmonics Control in Stair Case Waveform by a Novel Estimation based Technique

2018 ◽  
Author(s):  
Salman Ahmad ◽  
Atif Iqbal ◽  
Imtiaz Ashraf ◽  
Sanjeevikumar Padmanaban ◽  
Mohammed Meraj
Keyword(s):  
Pulse Width Modulation ◽  
Jacobian Matrix ◽  
Initial Guess ◽  
Singularity Problem ◽  
Linear Set ◽  
Medium Voltage ◽  
Switching Losses ◽  
Voltage Application ◽  
Simulation Results ◽  
Subsequent Iteration

Few switching transitions in high power and medium voltage application of Power converters are desirable. The selective harmonics elimination (SHE) pulse width modulation offers a better quality waveform with lower switching transitions and hence lower switching losses. The SHE is a pre-programmed modulation technique where certain amounts of lower order harmonics are removed and fundamental voltage is controlled. After Fourier analysis of output waveform, a set of nonlinear transcendental equations is obtained which exhibits, multiple, unique or no solution in different range of modulation index (MI). In this paper, an iterative method based on the Jacobian estimate is proposed to solve a highly non-linear set of SHE equations. The proposed technique is easy in implementation and can solve a large number of such equations as computation of the Jacobian matrix in the subsequent iteration is estimated from the previous values.&nbsp; Moreover, the proposed method also removes the singularity problem, especially for large SHE equations. High accuracy in the initial guess is also not essential for this method and can converge to the solution with any random initial guess. The computational and simulation results are given to validate the concept. The hardware result is provided to confirm the computational and simulation results.

scholarly journals Performance Improvement of Sensorless Vector Controlled Induction Motor Drive for Medium Power Applications

2019 ◽  
Vol 9 (2) ◽  
pp. 2061-2068
Keyword(s):  
Induction Motor ◽  
Performance Improvement ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Motor Drive ◽  
Induction Motor Drive ◽  
Space Vector ◽  
Torque Pulsations ◽  
Multi Level ◽  
Simulation Results

This paper deals with sensorless vector controlled induction motor in which torque pulsations are reduced with improved input of induction motor. In proposed technique two multi winding transformers are used for generation of 18 sinusoidal signals given to rectifier unit and the rectifier output given as input to 9 level multi level inverter. In this proposed technique gating signals to the inverter switches will be provided through space vector pulse width modulation which considers speed as reference. This configuration was simulated in MATLAB/Simulink.and the simulation results are presented here with improvement in reduction of THD.

Prototype of an Electric Drive Elevator

2017 ◽  
Vol 0 (0) ◽  
Author(s):  
M. Gaiceanu ◽  
S. Epure ◽  
C. R. Dache ◽  
S. Ciuta
Keyword(s):  
Electric Drive ◽  
Induction Machine ◽  
Power Converter ◽  
Experimental Platform ◽  
Electric Drive System ◽  
Ac Power ◽  
Three Phase ◽  
Chain Transmission ◽  
Simulation Results ◽  
Quality Features

Abstract The research purpose of the authors is reducing the energy consumption of the main worldwide consumer - the electric motors- by useful utilization of the input energy through the Regenerative Electric Drive System having also the power quality features. The prototype of the electric elevator consists mainly of two trolley: one serve for the active load, and the other as counterweight, gearbox, power converter, induction machine and chain transmission. The elevator is driven by using 4kW three-phase induction machine through AC-AC power converter and has the capacity of 450 kg. The numerical simulation results and the experimental platform are shown.

scholarly journals Research and design of grid connection and waste heat utilization of marine generating units

2020 ◽  
Vol 165 ◽  
pp. 06003
Author(s):  
Anning Yi ◽  
Hongtao Guo
Keyword(s):  
Power Generation ◽  
Service Life ◽  
Temperature Difference ◽  
Electromagnetic Interference ◽  
Frequency Conversion ◽  
Waste Heat ◽  
Economic Benefits ◽  
Energy Output ◽  
Utilization Rate ◽  
Energy Unit

This work is based on the use of waste heat from the temperature difference semiconductor heat exchanger, which can effectively use the waste heat in the exhaust gas, and convert it into electrical energy output through the temperature difference semiconductor material, which can increase engine efficiency and reduce energy consumption; at the same time, it can reduce engine noise and vibration. Extended service life. Due to the strong electromagnetic interference and severe vibration of the generator, there are few remote control devices on the market for the generator. This project uses a 2.4G wireless communication module to control the frequency conversion and speed regulation of the generator. In order to save manpower, start remotely, stop as soon as possible, monitor the operating status of the waste heat temperature difference power generation, reasonably replace the power, start quickly, and reach the electromechanical Integrated product. The realization of intelligent frequency conversion technology can adjust the engine speed according to different electrical appliances, adapt to external loads, realize automatic voltage adjustment, and save fuel consumption. The grid-connected system solves the frequency and phase problems of generators of different models, generations, and manufacturers in parallel, and realizes the re-mixing of old generators, which greatly improves the service life of engines and the best power generation supply, and reduces power generation systems and storage. The configuration cost of the energy unit improves the comprehensive utilization rate of the equipment, has a higher working efficiency, has good economic benefits, and can achieve the purpose of energy saving and emission reduction.

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