Effect of time variation of system impedance and voltage harmonics on LC compensation for nonlinear loads

2006 ◽  
Vol 153 (4) ◽  
pp. 619 ◽  
Author(s):  
M.M. Abdel Aziz ◽  
A.F. Zobaa ◽  
A.M. Ibrahim ◽  
A.M. Abdel Monem
Keyword(s):  
Time Variation ◽  
Nonlinear Loads ◽  
Voltage Harmonics

scholarly journals Analytical Modeling and Simulation of Four-Switch Hybrid Power Filter Working with Sixfold Switching Symmetry

2012 ◽  
Vol 2012 ◽  
pp. 1-17 ◽  
Author(s):  
Josef Tlustý ◽  
Jiří Škramlík ◽  
Jan Švec ◽  
Viktor Valouch
Keyword(s):  
Power System ◽  
Active Power ◽  
Electric Power System ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Negative Effects ◽  
Nonlinear Loads ◽  
Current Harmonics ◽  
Power Filter ◽  
Voltage Harmonics

Shunt active power filters are nowadays used for mitigation of harmonic currents from nonlinear loads. Current and voltage harmonics have negative effects on the operation of the electric power system. Thus, a great attention is focused on harmonic generation and control. Several standards have introduced limits on current harmonics injected into the power system and on voltage harmonics at the system busbars. The paper proposes a switching strategy for a four-switch converter as used in conventional six-switch converters. The voltage source converter is controlled by a unique space-vector modulation strategy proposed. Here is presented an analytical solution for a proposed active power filter topology, simulation, and experiments results proving the proposed strategy correctness and its characteristics.

scholarly journals Analysis for Industrial Grid Containing Nonlinear Loads

2018 ◽  
Vol 5 (1) ◽  
pp. 35-58
Author(s):  
Basim Mohammed Al Kadhimi
Keyword(s):  
Harmonic Distortion ◽  
Supply System ◽  
The European Union ◽  
Variable Speed ◽  
Nonlinear Loads ◽  
Variable Speed Drives ◽  
Uninterruptible Power ◽  
Current Flows ◽  
Mathcad Software ◽  
Voltage Harmonics

Harmonics is the most important issue among all issues related to the power quality. Harmonics comes from different non-linear loads like uninterruptible power supplies systems (UPS), variable speed motor drives, rectifiers, personal computers, adjustable speed drives, fluorescent lighting, rectifier banks, data processing loads, arc furnaces, and so on. Simulation of a real power supply system that consists of linear loads and nonlinear loads as variable speed drives has been carried out in the work. Variable speed drives generate harmonics into supply system that contains different values of compensated capacitors. Calculations of equivalent system reactance for generated harmonics, voltage harmonics, voltage harmonics in percentage, THD (Total Harmonic Distortion) of voltage, frequency characteristics, current flows in the system capacitor units have been worked out using Mathcad software. The obtained results have been compared with the European Standard (EN 50160) for supply quality requirements of the European Union.

scholarly journals FPGA-Based Software Implementation of Series Harmonic Compensation for Single Phase Inverters

VLSI Design ◽  
2010 ◽  
Vol 2010 ◽  
pp. 1-14 ◽  
Author(s):  
K. Selvajyothi ◽  
P. A. Janakiraman
Keyword(s):  
Single Phase ◽  
Harmonic Distortion ◽  
Noise Signal ◽  
Current Loop ◽  
Single Chip ◽  
Nonlinear Loads ◽  
Harmonic Compensation ◽  
Single Phase Inverter ◽  
Harmonic Components ◽  
Voltage Harmonics

This paper presents a single chip FPGA (Altera Cyclone II) controlled single phase inverter, programmed for the reduction of harmonics in the output voltage. Separate composite digital observers have been designed for extracting the fundamental and harmonic components of the voltage and the highly distorted current signals, particularly when the inverter supplies nonlinear loads. These observers have been embedded into the FPGA along with the controllers and I/O interfaces. The multiple observers yield very pure in-phase and quadrature voltage signals for use in the outer loop and similar signals for stabilizing the inner current loop. The Inverter could be modeled as a feed back control system with the fundamental component of the voltage as the desired output while the voltage harmonics take the role of noise creeping into the output. To obtain a very low total harmonic distortion in the voltage waveform, the well-known control strategy of using a very large feed back around the noise signal has been employed.

Comparison of the Acoustic Noise caused by Output Voltage Harmonics on Three-Phase Voltage-Fed Inverters

2019 ◽  
Vol 139 (11) ◽  
pp. 901-907
Author(s):  
Jumpei Sawada ◽  
Shin-ichi Motegi ◽  
Yoshitaka Nakamura ◽  
Masaki Yamada
Keyword(s):  
Output Voltage ◽  
Acoustic Noise ◽  
Phase Voltage ◽  
Three Phase ◽  
Voltage Harmonics

Improvement in Computational Accuracy of Output Transition Time Variation Considering Threshold Voltage Variations

2009 ◽  
Vol E92-A (4) ◽  
pp. 990-997
Author(s):  
Takaaki OKUMURA ◽  
Atsushi KUROKAWA ◽  
Hiroo MASUDA ◽  
Toshiki KANAMOTO ◽  
Masanori HASHIMOTO ◽  
...  
Keyword(s):  
Threshold Voltage ◽  
Time Variation ◽  
Transition Time ◽  
Computational Accuracy
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