Voltage Unbalance is a common type of power quality problem. Sequence components occur during unbalance in three phase system. For this reason unbalance is assessed with respect to the sequence components present in the system. Voltage unbalance may adversely affect power system components connected to the system. In this paper, for symmetric and asymmetric faults, positive sequence voltage is ...

The simple Selective Harmonic Elimination (SHE) for 3-Phase Voltage Source Inverter (VSI) is presented here. The proposed work is to examine the Selective Harmonic Elimination (SHE) and to eliminate harmonics produced by Pulse Width Modulation (PWM) inverter. The selective harmonic elimination method for three phase Voltage Source Inverter (VSI) is generally based on ideas of opposite harmonic ...

This study describes a novel approach to design of power factor correction (PFC) and total harmonic distortion (THD) reduction-based brushless DC (BLDC) motor drive. The drive was designed obtain reduced THD for PFC. basic the BLDC contains an AC voltage source as input diode bridge rectifier. output is filtered out reduce ripples. smooth supplied modified Zeta converter. converter controlled b...

Electrical drives for large capacity compressors in a liquefied natural gas (LNG) plant have been investigated. There are mainly two topologies for such an electrical drive; load commutated inverters (LCIs) and voltage source inverters (VSIs). Due to commutation of the thyristors, LCIs produce current harmonics with variable frequencies, and their interharmonics are significant. Therefore, tors...

ABSTRACT This paper analyses the dynamic performances of a VSI-DC brushless drive system suitable for an electrical vehicle propulsion. The main original part of the work is a computer simulator realized in Matlab-Simulink sofware package, based on the laboratory practical experiments. To monitorize and control the motor parameter variations and influences during the variable frequency motor dy...

This paper presents the analysis of a photovoltaic bases three-phase five level voltage source inverter (VSI) supplying induction motor driven water pump. The VSI uses a unipolar PWM technique for producing three phase 5 level voltage output and this output is used to drive three-phase induction motor driving a pump load. Multilevel inverters are used for generating AC voltage from several leve...

ABSTRACT—The Z-Source Inverter (ZSI) overcomes the disadvantages of the traditional Voltage-Source Inverter (VSI) and Current-Source Inverter (CSI).It can buck and boost its output voltage by utilizing the shoot-through state which is forbidden in traditional VSI. Different Pulse Width Modulation (PWM) techniques are available for the control of Z-Source Inverters. In the traditional PWM techni...

This paper presents the performance investigation of multi-phase voltage source inverter (VSI) with simple PWM switching techniques namely the harmonic injection and offset injection method. The technique discussed in this paper is easy to implement and avoid complicated controlling algorithm adapted in SVPWM technique. A generalized algorithm suitable for odd number of phases is developed in M...

Many current-controlled PWM methods have been proposed to design high performance of current control for grid-connected inverters in distributed power generation systems. However none of them have good performance in providing low THD and, at the same time, good robustness to parameters mismatch. Two different current control methods, namely, traditional predictive current controller and robust...