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This paper deals with the development of a V/F control of an induction motor with THD optimization using cascaded multilevel converters. The optimization algorithm was a genetic algorithm, which allows to obtain a voltage vs. frequency ratio (V/F) that decreases the voltage value as the frequency is reduced by maintaining the total harmonic distortion (THD) at levels very close to 0% over the entire...
The comparisons of the new offered optimum three-segment and the previously considered five-segment variants of the space vectors switching sequence are continued in values of the first three orders of the n-order integral voltage harmonics factors and in values of the first three orders of some unified indices, the so-called n-order aggregate switchings and integrated voltage harmonics factors. The...
In this study, a modified carrier is proposed to generate PWM gating signal. Proposed PWM method reduces total harmonic distortion (THD) of the output voltage of inverter up to 5.8% than the traditional triangular carrier based PWM. Major harmonic components in output voltage are less in magnitude when proposed PWM technique is applied to inverter. Fundamental component of output voltage is also higher...
In this paper cascaded h-Bridge multilevel inverter with SPWM technique is presented. Multilevel inverter have high power application & low harmonics due to these applications it is used widely in the area of control and energy distribution. This paper includes performance of 3-Level, 5-Level & 7-Level cascaded H-Bridge multilevel inverter with respect to number of switches, total harmonic...
Recently multilevel inverters are emerged as very important factor in high power and medium voltage application. Number of inverter topologies have been introduced and used for various application. Among these inverters cascaded MLI is used because of its advantages over other MLIs. Different control techniques are available to control these inverters. This paper presents a comparison of different...
The objective of this paper is to design and implement a third harmonic injection PWM strategy THIPWM on an FPGA, to control a two-level three phase PWM inverter, in order to generate a fundamental component, with variable amplitude and frequency of the inverter output voltage, by varying the modulation index and reference frequency. The developed strategy aims to explore the maximum of the available...
Non-linear behavior of power semiconductor switch and non-linear load creates power quality problem in an ac to ac converter. These non-linear switches and load injects significant harmonic on Load side as well as on source side. In this paper an attempt has been made to reduce these harmonics using staircase PWM technique and passive filter. For load side harmonic mitigation, staircase PWM technique...
This work proposes a comparison study of cascaded H-bridge multilevel inverter (CHBMLI) in which symmetrical and asymmetrical arrangement of five level and seven level H-bridge inverters are compared in order to find an optimized output voltage quality with lower harmonic distortion. Several studies have been conducted on the three phase cascaded symmetrical multilevel inverter (MLI). However, there...
An approach of harmonics component analysis, portraying the presence of certain amount of harmonics at the inverter output terminal, has been indicated in this paper. Some unwanted impacts are caused by the harmonics such as unbalance and excessive neutral currents, interference in nearby communication networks and disturbance to other consumer, torque pulsations in electric motor drives are and so...
The multilevel inverters (MLIs) are classified into three topologies such as Diode Clamped, Flying Capacitor and Cascade Multilevel Inverter (CMLI). CMLI topologies include two kind of structure that is named symmetric and asymmetric topologies. Asymmetric Cascade MLI (ACMLI) topologies consist of unequal DC sources. Many modulation techniques have been used in ACMLI topology such as Multi-Carrier...
Multilevel inverters when supplied from equal and constant DC sources does not have a practical sense of applications. For each of the specific harmonic profiles the variation of the DC sources affects the values of the switching angles. This increases the difficulty of the harmonic elimination's equations. This paper presents the application of the cascaded asymmetrical multilevel inverter in the...
This paper addresses a new multi-carrier modulation technique called wave shift multi-carrier modulation (WSHM), which used to control the cascade multilevel converter (CMC). The proposed switching technique generates lower voltage total harmonic distortion (THD) in comparison with conventional multi-carrier based pulse width modulation (PWM) schemes, phase-shift (PSHM) and level-shift (LSHM) modulations...
This paper presents the development of a state-of-the-art remotely controlled single phase Sinusoidal Pulse Width Modulated (SPWM) inverter with the incorporation of RISC microcontroller. A provision of remote control from a PC in addition to the local control is incorporated in order to control the functionality of the inverter. The microcontroller itself generates the required pulse according to...
Stair-case modulation technique, generally applied in multilevel inverter is now applied in AC to AC converter for reducing harmonics in the output for both cyclo-inverters as well as for cyclo-converter mode. Simulation results are shown for single-phase to single-phase matrix converter configuration using SIMULINK software. A relation has been obtained between the carrier frequency and output frequency...
Many papers have been written analyzing losses in AC machines and also losses in inverters. A much smaller number of papers are available which discuss the combined loss effect of AC machines operated by inverters. In those papers, either experimental results or finite element analysis are used to investigate these loss effects. To develop a better understanding of the means by which these losses...
Voltage or current converters generate discrete output waveforms, which require large inductances connected in series with the respective load to generate the desired current waveform. Mostly, neither the voltage nor the current waveforms are as expected and also have distorted voltages and currents waveforms produces harmonic contamination, additional power losses, and high frequency noise. In this...
Class D amplifiers are becoming the most feasible solution for embedded audio application. However, distortions due to the non-linear nature of switching stage are the main drawback for this amplifier topology. This paper discusses the design and implementation of high fidelity audio class D using sliding mode control scheme. This design method proves to be a cost effective solution for industrial...
High energy conversion efficiency of grid tied inverters for renewable energy applications constitutes a prime design goal of these systems. On the other, presently employed PWM techniques seem to set a bound to the efficiency since the associated switching losses are difficult to reduce. This paper introduces a new approach to synthesis of sinusoidal waveform in which the switching frequency is relatively...
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