Open AccessDesign and application of a thyristor switched capacitor bank for a high harmonic distortion and fast changing single‐phase electric welding machine
Author(s) -
Ko WeiHsiang,
Gu JyhCherng
Publication year - 2016
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2016.0310
Subject(s) - thyristor , total harmonic distortion , integrated gate commutated thyristor , distortion (music) , capacitor , welding , electrical engineering , thd analyzer , single phase electric power , harmonic , mos controlled thyristor , switched capacitor , materials science , electronic engineering , computer science , engineering , acoustics , power factor , physics , voltage , mechanical engineering , nonlinear distortion , amplifier , cmos
A single‐phase electric machine invokes a great reactive power demand in operation, resulting in a large voltage fluctuation in the supply system. Furthermore, the frequent and rapid operating characteristics of an electric welding machine cause a serious voltage flicker problem. The operation of welding equipment also generates significant harmonic current distortion, and distorts the voltage waveform of the supply system. Hence, this study focused on designing and applying a thyristor switched capacitor (TSC) bank for voltage flicker improvement. However, the single‐phase TSC should also satisfy the reactive power demand and compensation speed, considering proper ratings of TSC to bear high harmonic distortion. This study shows the calculation results and discusses the impact of different capacities and different step numbers on TSC design. In addition, thyristor switches and a single‐phase power factor controller were designed and implemented. The experimental results are also presented.