scholarly journals Experimental Evaluation on the Influence of RCD Snubbers in a 3-Level Thyristor Based MLCR CSC

2016 ◽  
Vol 2016 ◽  
pp. 1-18
Author(s):  
Bhaba P. Das ◽  
Neville R. Watson ◽  
Yonghe Liu
Keyword(s):  
Experimental Evaluation ◽  
Output Voltage ◽  
Current Source ◽  
Harmonic Distortion ◽  
Experimental Results ◽  
Input Current ◽  
Trade Off ◽  
Current Harmonic ◽  
Line Current ◽  
Snubber Circuit

Multilevel current reinjection (MLCR) concept provides self-commutation capability to thyristors, enabling thyristor based current source converters (CSC) to operate under negative firing angle. It also lowers the input current harmonic distortion. This is achieved by using an auxiliary reinjection bridge. Extensive experimental results are presented in this paper to analyse the performance of the 3-level MLCR CSC for different snubber components across the reinjection bridge. The trade-off in the choice of the snubber circuit is illustrated, with its influence on the AC side line current and DC side output voltage of the 3-level MLCR CSC.

scholarly journals Multi-Pulse SCR Rectifiers

2021 ◽  
Author(s):  
Mei Li
Keyword(s):  
Experimental Verification ◽  
Current Source ◽  
Harmonic Distortion ◽  
Motor Drives ◽  
Line Current ◽  
High Voltage Direct Current ◽  
Battery Chargers ◽  
Power Battery ◽  
Harmonic Elimination ◽  
Three Phase

This thesis presents the introduction, analysis and experimental verification of the six-pulse SCR rectifier and multi-pulse SCR rectifiers. As a fundamental three-phase controllable ac-dc converter, the six-pulse SCR rectifier is widely used in industry. However, it generates high Total Harmonic Distortion (THD) in the line current. One of the solutions is to use multi-pulse rectifiers. Multi-pulse rectifiers could be classified into the 12-, 18-, and 24-pulse configurations. Application examples include high voltage direct current transmission systems, high power battery chargers and load commutated current source inverter powered motor drives. In this thesis, the six-, 12-, 18- and 24-pulse SCR rectifiers with inductive and capacitive loads are introduced. The line current THD and the input PF of various rectifiers are investigated. The principle of the harmonic elimination through phase-shifting transforms is analyzed by Fourer analysis and positive/negative sequence analysis. The experimental verification is accomplished on a prototype of the 12-pulse SCR recitifier.

scholarly journals A comparative study of cascade H-bridge multilevel voltage source inverter and parallel inductor multilevel current source inverter

2019 ◽  
Vol 10 (3) ◽  
pp. 1355
Author(s):  
Nik Fasdi Nik Ismail ◽  
Norazlan Hashim ◽  
Dalina Johari
Keyword(s):  
Output Voltage ◽  
Current Source ◽  
Harmonic Distortion ◽  
Voltage Source ◽  
Voltage Source Inverter ◽  
Analysis Study ◽  
Multilevel Inverters ◽  
Advantages And Disadvantages ◽  
Current Source Inverter ◽  
Current Source Inverters

This paper presents the analysis study between multilevel inverters that are often classified into multilevel voltage source and multilevel current source inverters.  For multilevel voltage source inverter (MVSI), the specific topology studied for this work is the Cascaded H-Bridge MVSI.  Whereas, the multilevel current source inverter (MCSI) is based on Paralleled Inductor Configuration MCSI.  For this study, the analysis between these converters are done with respect to the number of components, the advantages and disadvantages of each converters during performing inverter operation. In term of output voltage and current quality, the percentage of the Total Harmonic Distortion (THD) are measured and compared for both topologies.  MATLAB/Simulink software has been used in this research to design and simulate in order to study the performances of both inverters.

scholarly journals A Hybrid Control Scheme with Fast Transient and Low Harmonic for Boost PFC Converter

Electronics ◽  
2021 ◽  
Vol 10 (15) ◽  
pp. 1848
Author(s):  
Sen-Tung Wu ◽  
Fu-Yuan Chen ◽  
Min-Chu Chien ◽  
Jian-Min Wang ◽  
Yan-Ying Su
Keyword(s):  
Control Strategy ◽  
Feedforward Control ◽  
Harmonic Distortion ◽  
Dynamic Responses ◽  
Input Current ◽  
Direct Reading ◽  
Peak Voltage ◽  
Current Harmonic ◽  
Control Loops ◽  
Control Circuits

In this study, a new control strategy was proposed to improve transient response and the input current harmonic distortion of power factor correction (PFC) regulators operating in an average current mode. The proposed technique required only two additional gain selectors and a peak detector circuit on the feedforward voltage loop and output voltage feedback loops. It provided a direct reading for the average voltage value of feedback control loops and the peak voltage of feedforward control loops, producing PFC boost regulators with fast dynamic responses and low-input current harmonic distortion. The use of digital potentiometers for directly changing the gain of control loops did not require any divider or squarer to reduce the complexity of control circuits. The operating principles and control strategies of 300 W boost PFC with the new control strategy are presented with detailed analysis and discussion. The experimental results were satisfactory.

Voltage Ripple Reduction in Voltage Loop of Voltage Source Converter

2017 ◽  
Vol 8 (2) ◽  
pp. 869
Author(s):  
Jedsada Jaroenkiattrai ◽  
Viboon Chunkag
Keyword(s):  
Output Voltage ◽  
Harmonic Distortion ◽  
Input Voltage ◽  
Input Power ◽  
Input Current ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Dynamical Response ◽  
Voltage Ripple ◽  
Ripple Reduction

In order to achieve a good dynamical response of a full-bridge AC-DC voltage source converters (VSC). The bandwidth of PI controller must be relatively wide. This leads to the voltage ripple produced in the control signal, as known that its ripple frequency has twice of the line frequency and cause the 3rd harmonic of an input current. A Ripple Voltage Estimator (RVE) algorithm and Feed-Forward Compensation (FFC) algorithm are proposed and added to the conventional control. The RVE algorithm estimated the ripple signal to subtract it occurring in the voltage loop. As a result, the 3rd harmonic of the input current can be reduced, and hence the Total Harmonic Distortion of input current (THDi) are improved.  In addition, the FFC algorithm will offer a better dynamical response of output voltage. The performance evaluation was conducted through the simulation and experiment at 110Vrms/50Hz of the input voltage, with a 600 W load and 250 V<sub>dc</sub> output voltage. The overall system performances are obtained as follows: the power factor at the full load is higher 0.98, the harmonic distortion at AC input power source of the converter is under control in IEC61000-3-2 class A limit, and the overall efficiency is greater than 85%.

Efficiency Optimized Brushless DC Motor Drive based on Input Current Harmonic Elimination

2015 ◽  
Vol 6 (4) ◽  
pp. 869
Author(s):  
Tridibesh Nag ◽  
Arijit Acharya ◽  
Debashis Chatterjee ◽  
Ashoke Kumar Ganguli ◽  
Arunava Chatterjee
Keyword(s):  
Harmonic Distortion ◽  
Input Current ◽  
Brushless Dc Motor ◽  
Motor Drive ◽  
Efficiency Improvement ◽  
Current Harmonic ◽  
Brushless Dc ◽  
Harmonic Elimination ◽  
Selective Harmonic Elimination ◽  
Core Losses

<p>This paper describes efficiency improvement of a position sensorless brushless DC (BLDC) motor with improved PWM scheme for the inverter compared to existing ones. This is based on Selective Harmonic Elimination (SHE). The proposed method reduces total harmonic distortion (THD) from the input current and armature flux and thereby reducing the core losses. The effectiveness of the proposed scheme is demonstrated through simulation and experimental results.</p>

Analytical Model of 12-Pulse AC-DC Converter Based on Switch Function

2011 ◽  
Vol 143-144 ◽  
pp. 223-227
Author(s):  
Lei Gao ◽  
Wei Ming Tong ◽  
Fan Gang Meng
Keyword(s):  
Frequency Domain ◽  
Analytical Model ◽  
Power Factor ◽  
Output Voltage ◽  
Input Current ◽  
Frequency Domain Method ◽  
Input Line ◽  
Line Current ◽  
Domain Method ◽  
Simulation Results

This paper proposes a frequency domain method to analyze the harmonics components of input current and ripple coefficients of output voltage in 12-pulse diode rectifier system. Based on frequency domain linearity and analysis of commutation, the dc side output voltage and input line current are divided into two segments, and then expressions of the input current and output voltage are obtained. Some simulation results about THD, power factor and ripple coefficient are shown to validate the correctness of the proposed method

scholarly journals Single-stage Current Source Inverter With Amplified Sinusoidal Output Voltage: Analysis, Simulation And Experimental Results

2011 ◽  
Vol 16 (3) ◽  
pp. 222-232 ◽  
Author(s):  
Lucas Sampaio Garcia ◽  
Luiz Carlos de Freitas ◽  
João Batista Vieira Júnior ◽  
Ernane Antônio Alves Coelho ◽  
Valdeir José Farias ◽  
...  
Keyword(s):  
Output Voltage ◽  
Current Source ◽  
Single Stage ◽  
Experimental Results ◽  
Current Source Inverter
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