scholarly journals A novel isolated 36-pulse AC-DC converter for line current harmonic mitigation

2018 ◽  
Vol 16 (4) ◽  
Author(s):  
Rohollah Abdollahi
Keyword(s):  
Harmonic Distortion ◽  
Design Procedure ◽  
Simulation Models ◽  
Test Results ◽  
Quality Indices ◽  
Current Harmonic ◽  
Electrochemical Processes ◽  
Large Current ◽  
Simulation Results ◽  
Load Conditions

In this paper, a novel delta/tapped star transformer for 36-pulse AC-DC converter configuration is designed, modeled, simulated and developed to feed isolated DC varying loads. The proposed AC-DC converter is suitable for large current rating rectifiers such as electrowinning, electrochemical processes, induction heating, etc. Its main feature is its reduced kilovolt-ampere (kVA) rating. The circuit has been designed for retrofit applications, a delta/tapped star-connected transformer platform is also included in the converter. First, we have simulated the proposed scheme via Matlab/Simulink software supplying different load conditions. Then, it has been implemented based on the motivation we have gained throughout the simulation results. The results show significant improvement in power quality indices (according to the IEEE-519) at the point of connection to the utility. We achieve less than 4% of input current total harmonic distortion (THD) with our proposed configuration for supplying different load scenarios. Moreover, we achieve a satisfying power factor (almost unity) for DTCIMD operation. Also, a prototype of the proposed transformer-based 36-pulse ac–dc converter has been developed, and test results are presented to validate the developed design procedure and the simulation models of this ac–dc converter.

scholarly journals Thirty-six pulse rectifier scheme based on zigzag auto-connected transformer

2016 ◽  
Vol 65 (1) ◽  
pp. 117-132 ◽  
Author(s):  
Chen Xiao-Qiang ◽  
Hao Chun-Ling ◽  
Qiu Hao ◽  
Li Min
Keyword(s):  
Induction Motor ◽  
Power Quality ◽  
Design Process ◽  
Design Procedure ◽  
Motor Drives ◽  
Quality Indices ◽  
Induction Motor Drives ◽  
Detailed Design ◽  
Load Variation ◽  
Simulation Results

AbstractIn this paper, a low kilo-volt-ampere rating zigzag connected autotransformer based 36-pulse rectifier system supplying vector controlled induction motor drives (VCIMD) is designed, modeled and simulated. Detailed design procedure and magnetic rating calculation of the proposed autotransformer and interphase reactor is studied. Moreover, the design process of the autotransformer is modified to make it suitable for retrofit applications. Simulation results confirm that the proposed 36-pulse rectifier system is able to suppress less than 35thharmonics in the utility line current. The influence of load variation and load character is also studied to demonstrate the performance and effectiveness of the proposed 36-pulse rectifiers. A set of power quality indices at AC mains and DC link are presented to compare the performance of 6-, 24- and 36-pulse AC-DC converters.

scholarly journals Design and construction of a polygon-connected autotransformer-based 36-pulse AC-DC converter for power quality improvement in retrofit applications

2015 ◽  
Vol 63 (2) ◽  
pp. 353-362 ◽  
Author(s):  
R. Abdollahi
Keyword(s):  
Power Quality ◽  
Harmonic Distortion ◽  
Design Procedure ◽  
Quality Criteria ◽  
Simulation Models ◽  
Unity Power Factor ◽  
Wide Range ◽  
Bridge Rectifier ◽  
Power Quality Improvement ◽  
Point Of Common Coupling

Abstract This paper presents the design and analysis of a polygon connected autotransformer based 36-phase AC-DC converter which supplies direct torque controlled induction motor drives (DTCIMD’s) in order to have better power quality conditions at the point of common coupling. The proposed converter output voltage is accomplished via two paralleled eighteen-pulse AC-DC converters each of them consisting of nine-phase diode bridge rectifier. An autotransformer is designed to supply the rectifier. The design procedure of magnetics is in a way such that makes it suitable for retrofit applications where a six-pulse diode bridge rectifier is being utilized. The proposed structure improves power quality criteria at ac mains and makes them consistent with the IEEE-519 standard requirements for varying loads. Furthermore, near unity power factor is obtained for a wide range of DTCIMD operation. A comparison is made between 6-pulse and proposed converters from view point of power quality indices. Results show that input current total harmonic distortion (THD) is less than 4% for the proposed topology at variable loads. A laboratory prototype of the proposed Polygon-Connected autotransformer-based 36-pulse AC-DC converter is developed and test results are presented to validate the developed design procedure and the simulation models of this AC-DC converter under varying loads

On the Analysis of Experimental Data for External Gear Machines and Their Comparison With Simulation Results

2007 ◽  
Author(s):  
Andrea Vacca ◽  
Germano Franzoni ◽  
Paolo Casoli
Keyword(s):  
Experimental Data ◽  
Simulation Models ◽  
Measuring System ◽  
Gear Pump ◽  
Test Results ◽  
Measuring Systems ◽  
Measuring Device ◽  
Delivery Pressure ◽  
Pressure Ripple ◽  
Simulation Results

This paper deals with the simulation of hydraulic gear machines, focusing on the validation of simulation models and on the comparison between numerical results and experimental data, concerning both steady and unsteady conditions. First authors give a brief overview on the simulation tool HYGESim, which has been presented and discussed in several previous papers. Afterwards, the attention shifts on the analysis of the simulation results for the case of a stock gear pump. Regarding steady state characteristics, the paper shows how HYGESim is able to accurately reproduce the operation of the analyzed pump, in terms of flow, pressures and efficiency maps. Regarding unsteady simulations, namely the delivery pressure ripple, the paper highlights the significant effort done by the authors in order to achieve experimental data clear and suitable for the comparison with simulation results. In fact, the peculiarities of common measuring systems (in particular of the load apparatus and the sampling methods) are often difficult to reproduce numerically: frequently different acceptable assumptions in the numerical model lead to remarkable discrepancies in simulated results. For this purpose, the authors developed a measuring device mainly focused on the easy reproducibility in the simulation environment. Furthermore, an original technique for processing unsteady data (pressure and flow ripples) is proposed, allowing to achieve comparable data indifferently of the adopted sampling method and of the data origin (experimental or numerical). In the final part of the paper, pressure ripple simulations and test results (obtained with the described measuring system and analyzed with the described technique) are presented and compared.

Design and Experimental Verification of 20-Pulse AC–DC Converter for Retrofit Applications and Harmonic Mitigation

2017 ◽  
Vol 26 (10) ◽  
pp. 1750147 ◽  
Author(s):  
Rohollah Abdollahi
Keyword(s):  
Power Quality ◽  
Harmonic Distortion ◽  
Design Procedure ◽  
Quality Criteria ◽  
Simulation Models ◽  
Motor Drives ◽  
Unity Power Factor ◽  
Wide Range ◽  
Bridge Rectifier ◽  
Point Of Common Coupling

This paper presents the design and analysis of a polygon-connected autotransformer based 20-pulse AC–DC converter which supplies direct torque-controlled induction motor drives (DTCIMDs) in order to have better power quality conditions at the point of common coupling. The proposed converter output voltage is accomplished via two paralleled 10-pulse AC–DC converters each of them consisting of five-phase diode bridge rectifier. An autotransformer is designed to supply the rectifiers. The design procedure of magnetics is in such a way that makes it suitable for retrofit applications where a six-pulse diode bridge rectifier is being utilized. The proposed structure improves power quality criteria at AC mains and makes them consistent with the IEEE-519 Standard requirements for [Formula: see text]. Furthermore, near-unity power factor is obtained for a wide range of DTCIMD operations. A comparison is made between six-pulse and proposed converters from the viewpoint of power quality indices. Results show that input current total harmonic distortion (THD) is less than 8% for the proposed topology at variable loads. A laboratory prototype of the proposed polygon-connected autotransformer-based 20-pulse AC–DC converter is developed and test results are presented to validate the developed design procedure and the simulation models of this AC–DC converter under varying loads.

Switching Angles Optimization of Single Phase PWM DC-AC Inverter by Particle Swarm Optimizations

2014 ◽  
Vol 18 (3) ◽  
pp. 435-442 ◽  
Author(s):  
Takuya Shindo ◽  
◽  
Kenya Jin’no
Keyword(s):  
Single Phase ◽  
Particle Swarm Optimization Algorithm ◽  
Harmonic Distortion ◽  
Particle Swarm ◽  
Design Procedure ◽  
Pso Algorithm ◽  
Evaluation Function ◽  
Swarm Optimization ◽  
Simulation Results ◽  
Harmonic Components

We consider the design procedure for a single-phase PWM DC-AC inverter using a particle swarm optimization algorithm. The switching operation is the most important component of the single-phase PWM DC-AC inverter. The PSO algorithm optimizes the switching angle effectively. The design procedure of the switching angle evaluates total harmonic distortion and the effective value of output. The proposed evaluation function restricts the scope to evaluating harmonic components. Based on numerical simulation results, we confirmed that the performance of the proposed design procedure was improved compared to the conventional sinusoidal PWM procedure. We develop an implementation circuit for our PWM DCAC inverter. By using the implemented circuit, we confirmed that results for implementation circuits are consistent with results for numerical simulations, indicating that the proposed algorithm exhibits better performance than the conventional sinusoidal PWM DC-AC inverter.

Zigzag Connected Autotransformer-Based 24-pulse AC-DC Converter

2015 ◽  
Vol 16 (1) ◽  
pp. 23-32 ◽  
Author(s):  
Chen Xiao-qiang ◽  
Qiu Hao
Keyword(s):  
Induction Motor ◽  
Power Quality ◽  
Design Procedure ◽  
Motor Drives ◽  
Quality Indices ◽  
Induction Motor Drives ◽  
Load Variation ◽  
Simulation Results

Abstract In this paper, a zigzag connected autotransformer-based 24-pulse AC-DC converter is designed, modeled and simulated to feed direct torque controlled induction motor drives. Winding arrangements and parameters of the autotransformer and interphase reactor are given. Moreover, the design procedure of the autotransformer is modified to make it suitable for retrofit applications. Simulation results indicate that the system is capable of eliminating up to 21st harmonics in the ac mains current. The effect of load variation and load character is also studied to demonstrate the performance and effectiveness of the proposed 24-pulse converters. A set of power quality indices at ac mains and dc side are presented to compare the performance of 6-, 12- and 24-pulse converters.

Study of delta/polygon-connected transformer-based 36-pulse ac-dc converter for power quality improvement

2012 ◽  
Vol 61 (2) ◽  
pp. 277-292 ◽  
Author(s):  
Rohollah Abdollahi
Keyword(s):  
Quality Improvement ◽  
Power Quality ◽  
Harmonic Distortion ◽  
Design Procedure ◽  
Quality Indices ◽  
Unity Power Factor ◽  
Wide Range ◽  
Bridge Rectifier ◽  
Power Quality Improvement ◽  
Point Of Common Coupling

Study of delta/polygon-connected transformer-based 36-pulse ac-dc converter for power quality improvementDesign of a delta/polygon-connected autotransformer based 36-pulse ac-dc converter is presented in this paper. The 36-pulse topology is obtained via two paralleled eighteen-pulse ac-dc converters each of them consisting of a nine-phase (nine-leg) diode bridge rectifier. For independent operation of paralleled diode-bridge rectifiers, two interphase transformers (IPT) is designed and implemented. A transformer is designed to supply the rectifier. The design procedure of magnetics is in a way such that makes it suitable for retrofit applications where a six-pulse diode bridge rectifier is being utilized. The proposed structure has been implemented and simulated using Matlab/Simulink software under different load conditions. Simulation results confirmed the significant improvement of the power quality indices (consistent with the IEEE-519 standard requirements) at the point of common coupling. Furthermore, near unity power factor is obtained for a wide range of DTCIMD operation. A comparison is made between 6-pulse and proposed converters from view point of power quality indices. Results show that input current total harmonic distortion (THD) is less than 4% for the proposed topology at variable loads.

Hybrid multi-plate magnetorheological clutch featuring two operating modes: Fluid coupling and mechanical friction

2021 ◽  
pp. 1045389X2098808
Author(s):  
Jin-Young Park ◽  
Gi-Woo Kim ◽  
Jong-Seok Oh ◽  
Young-Choon Kim
Keyword(s):  
High Performance ◽  
Design Procedure ◽  
Operating Mode ◽  
Field Analysis ◽  
Test Results ◽  
Bingham Model ◽  
Operating Modes ◽  
Magnetic Field Analysis ◽  
Fluid Coupling ◽  
Simulation Results

Recently, there has been a rising demand for high-performance clutches in mechanical systems owing to the development of industrial technologies. This paper, therefore, proposes a hybrid multi-plate Magnetorheological (MR) clutch that has both fluid coupling and mechanical friction modes. To reduce impact when the plates are in contact with each other, a fluid coupler’s operating mode was used at the beginning of the clutch operation. For this, torque modeling in each mode was induced based on the Bingham model of the MRF. Using the induced torque modeling and ANSYS Maxwell’s magnetic field analysis results, the design procedure for a multi-plate clutch was implemented. Based on the design results, a hybrid multi-plate MR clutch was manufactured. Finally, the performance of the manufactured MR clutch was evaluated using a torque tester. The assessment confirmed that the proposed torque modeling and simulation results mostly matched the test results.

scholarly journals Design and Validation of a Reduced Switching Components Step-Up Multilevel Inverter (RSCS-MLI)

Processes ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 1948
Author(s):  
Mohammad Wasiq ◽  
Adil Sarwar ◽  
Zeeshan Sarwer ◽  
Mohd Tariq ◽  
Shafiq Ahmad ◽  
...  
Keyword(s):  
Power Loss ◽  
Output Voltage ◽  
Hardware Implementation ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Level Control ◽  
Loss Analysis ◽  
Simulation Results ◽  
Insight Into ◽  
Load Conditions

A reduced switching components step-up multilevel inverter (RSCS-MLI) is presented in the paper. The basic circuit of the proposed MLI can produce 11 levels in the output voltage with a reduced number of switching components. The other features of the proposed circuit include a low value of voltage stresses and the inherent generation of the voltage levels pertaining to the negative half without the requirement of an H-bridge. Fundamental frequency switching technique, also known as Nearest Level Control (NLC) technique, is implemented in the proposed topology for generating the switching signals. The experimental total harmonic distortion (THD) in the output voltage comes out to be 9.4% for modulation index equal to 1. Based on different parameters, a comparative study has been shown in the paper, which makes the claim of the proposed MLI stronger. An experimental setup is prepared to carry out the hardware implementation of the proposed structure and monitor its performance under dynamic load conditions, which is also used to verify the simulation results. Power loss analysis, carried out by using PLECS software, helps us to gain insight into different losses occurring while operating the inverter. The different results are explained and analyzed in the paper.

Modeling and Design of Permanent Magnet Vibration-to-Electrical Power Generator’s Induction Coil

2012 ◽  
Vol 588-589 ◽  
pp. 614-617
Author(s):  
Zhi Hua Wang ◽  
Mei Ling Li ◽  
Jian Zhang ◽  
Li Wang ◽  
Yong Xu
Keyword(s):  
Permanent Magnet ◽  
Electrical Power ◽  
Induction Coil ◽  
Test Results ◽  
Coil Design ◽  
Sinusoidal Vibration ◽  
Electrical Generator ◽  
Simulation Results ◽  
Peak Value

The Equivalent Turn Number of Coil (ETNC) is proposed for induction coil design. Simulation results show that the vibrationonthe induction coil’s structure. The optimized coil is composed by two symmetry parts on the condition of sinusoidal vibration. The effective value of output EMF of optimized coil increases 51.39% than uniform coil’s. In the experiment, the optimized and uniform coils are fabricated with 600 turns and comparatively studied in the same vibration-to-electrical generator. The test results show that the peak-to-peak value and effective value of output EMF of the optimized coil can increase up to 52.59% and 48.76%, respectively, compared with the uniform coil.

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