scholarly journals Characteristic and Non-Characteristic Harmonics, Harmonic Cancellations and Relevant International Standards in Variable Speed Drives

2002 ◽  
Vol 7 (1) ◽  
pp. 123
Author(s):  
Syed M. Islam
Keyword(s):  
Single Phase ◽  
Supply Voltage ◽  
International Standards ◽  
Wave Form ◽  
Variable Speed ◽  
Variable Speed Drives ◽  
Front End ◽  
Three Phase ◽  
Research Findings ◽  
Voltage Wave

This paper will present a review of characteristic harmonics in both single phase and three phase drive front end rectifiers, discuss recent research findings in identifying sources and production of non-characteristic harmonics and amplification of harmonic levels when the front end rectifiers are fed from non-ideal supply conditions. Significant amount of triplens may be generated due to unbalances in utility supply voltage wave form and anticipated harmonic levels may vary widely. The paper will also discuss international harmonic standards such as the AS 2279, IEEE 519, and IEC 61000 series applicable to rectifier loads. Finally, the paper will present techniques to reduce harmonic levels by mixing of single phase and three phase non-linear loads resulting from mutual cancellations.  

scholarly journals Systematic Implementation of Multi-Phase Power Supply (Three to Six) Conversion System

Electronics ◽  
2019 ◽  
Vol 8 (1) ◽  
pp. 109 ◽  
Author(s):  
Rashid Al-Ammari ◽  
Atif Iqbal ◽  
Amith Khandakar ◽  
Syed Rahman ◽  
Sanjeevikumar Padmanaban
Keyword(s):  
Phase Transformation ◽  
Phase Difference ◽  
Power Supply ◽  
Phase System ◽  
Variable Speed ◽  
Variable Speed Drives ◽  
Pulse Input ◽  
Wind Energy Generation ◽  
Three Phase ◽  
Multi Phase

Multiphase (more than three) power system has gained popularity due to their inherent advantages when compared to three-phase counterpart. Multiphase power supply is extensively used in AC/DC multi-pulse converters, especially supply with multiple of three-phases. AC/DC converter with multi-pulse input is a popular solution to reduce the ripple in the DC output. Single-phase and three-phase transformers and phase transformation from single to multiphase are employed in variable speed drives application to feed the multi-cell H-Bridge converters and multi-pulse AC-DC converters. Six-phase system is extensively discussed in the literature for numerous applications ranging from variable speed drives to multiphase wind energy generation system. This paper shows the systematic phase transformation technique from three-phase to six-phase (both symmetrical and asymmetrical) for both understanding and teaching purposes. Such an approach could help students understand a promising advanced concept in their undergraduate courses. When phase difference between the two consecutive phases of six phases has a phase difference of 60, it is called a symmetrical six-phase system; while an asymmetrical or quasi, six-phase has two set of three-phase with a phase shift of 30 between the two sets. Simulation and experimental results are also presented.

Variable speed drive with PFC front‐end for three‐phase induction motor

2017 ◽  
Vol 53 (16) ◽  
pp. 1139-1140 ◽  
Author(s):  
M. Gonzalez‐Ramirez ◽  
C.A. Cruz‐Villar
Keyword(s):  
Induction Motor ◽  
Variable Speed ◽  
Variable Speed Drive ◽  
Front End ◽  
Three Phase

scholarly journals Analysis and performance evaluation of a three-phase sparse neutral point clamped converter for industrial variable speed drives

2021 ◽  
Author(s):  
Davide Cittanti ◽  
Mattia Guacci ◽  
Spasoje Mirić ◽  
Radu Bojoi ◽  
Johann Walter Kolar
Keyword(s):  
Degrees Of Freedom ◽  
Performance Comparison ◽  
Neutral Point ◽  
Modulation Scheme ◽  
Phase System ◽  
Variable Speed ◽  
Variable Speed Drives ◽  
Chip Area ◽  
Three Phase ◽  
Clamped Converter

Abstract This paper analyzes the operation and characterizes the performance of a three-phase three-level (3-L) Sparse Neutral Point Clamped converter (SNPCC) for industrial variable speed drives (VSDs). The operating principle of the SNPCC, which advantageously employs a lower number of power transistors than a conventional 3-L inverter, is described in detail, focusing on the AC-side differential-mode and common-mode voltage formation and on the DC-side mid-point current generation processes. The degrees of freedom in the SNPCC modulation scheme are defined and several switching sequences are investigated. Afterwards, the stresses on the active and passive components (e.g. semiconductor losses, machine phase current ripple, DC-link capacitor RMS current, etc.) are calculated by analytical and/or numerical means, enabling a straightforward performance comparison among the identified switching sequences. The most suited modulation strategy for VSD applications is then selected and a chip area sizing procedure, aimed at minimizing the total semiconductor chip size, is applied to a 800V 7.5kW three-phase system. The performance limits of the designed SNPCC are evaluated and finally compared to the ones of conventional 2-L and 3-L solutions, highlighting the promising cost/performance trade-off of the analyzed topology.

Sign in / Sign up

Export Citation Format

Share Document