Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Harmonics

Harmonics Study of 3-Phase Space Vector PWM Inverter

Ahamed Assad Hadi; Majid K. Al-Khatat

Engineering and Technology Journal, 2011, Volume 29, Issue 12, Pages 2439-2455

This paper proposes the modeling ,implementation and simulation of three phase induction motor driver, using voltage- fed space vector pulse width modulation technique (SVPWM).The sources of total harmonics (i.e. total effective harmonics,inter-harmonics,and sub-harmonics) and how it affects on drive system and their affects on the supply power network are studied. A developed formula of total harmonics distortion factor (THD) including ,inter -harmonic, and sub- harmonic has been introduced while in the previous studies are neglected. The effect of inter-harmonics and sub-harmonics on the performance parameter of total harmonics distortion factor , switching losses factor (SLF) and quality factor (QF) has been deduced. Modeling , and simulation of the system using PSIM software are also presented. All results are obtained by studying the waveforms of voltage and current at the source and load sides with different speeds of motor drive. The simulation and experimental result are consistent with theoretical studies and excellent , they indicate that the model is accurate and practicable.

Harmonics Distribution in Electrical Power System Containing Static Var Compensator

Mohammed K. Edan

Engineering and Technology Journal, 2009, Volume 27, Issue 3, Pages 559-572

This research presents a harmonic analysis of the power system with static VAR
compensator. The model is formed by parallel combination of Thyristor Control
Reactor (TCR) with a bank of capacitor .This model based on use of harmonic
switching functions and this harmonic model is completely general and can be
interpreted as a harmonic admittance equivalent. It is suitable for direct
incorporation into the harmonic domain frame of reference where it combines
easily with frequency dependent admittances of the transmission network, and
with other linearised component. This approach leads to efficient iterative solution
of power networks containing TCR. The general operating condition corresponds
to a case, when the switching instant of thyristor valve are function of network
nodal voltage conditions, this applies to both thyristor turn-on and turn-off
instants. In such situation the voltage zero crossing points calculated with good
accuracy at each iterative step, are used to update the TCR switching function.
Newton-Raphson technique is used to determine the zero-crossing points.