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Cascaded H-Bridge multilevel inverters synthesize a medium voltage output based on a series connection of power cells which use standard low-voltage component configurations. This characteristic allows one to achieve high-quality output voltages and input currents and also outstanding availability due to their intrinsic component redundancy. Due to these features, the cascaded multilevel inverter...
This paper presents the performance of a 4-switch, 3-phase high performance Z-source inverter (4S3P) fed cost effective induction motor (IM) drive system. In the proposed approach, instead of a conventional 6-switch, 3-phase inverter (6S3P) a 4-switch, 3-phase Z-source inverter is utilized. This reduces the cost of the inverter, the switching losses, and the complexity of the control algorithms and...
Multilevel inverters have gained interest in recent years in high-power medium-voltage industry. This paper considered the most popular structure among the transformer-less voltage source multilevel inverters, the diode-clamped inverter based on the neutral point converter. This paper use conventional switching sequence and optimum switching sequence of SVPWM technique. Simulation results presents...
This paper presents the comparison between improved asymmetric space vector modulation (ASVM) and sinusoidal pulse width modulation (SPWM) for voltage source converters (VSCs) when the switching frequency is as low as 9 times of line frequency. By adding two pulses in each line cycle when the fundamental voltage crosses zero, the total harmonic distortion (THD) of output current can be reduced significantly...
In this paper, the current Harmonics in the 12-Pulse uncontrolled AC/DC converter fed AC Drives was studied. The 12-pulse Δ-Y type AC/DC converter will keep a balanced voltage with 30° phase shifted at the low coupling coefficient condition. Different converter arrangements for 12-pulse-based rectification are also studied and a novel harmonic mitigator capable of suppressing fifth, seventh, and 11...
In recent years multi level inverters are used high power and high voltage applications. In this paper propose PWM control strategy thirteen level cascaded H- bridge multi level inverter. This method introduce sine wave is compared with the triangular carrier wave with different phase relationship. The carrier based Phase disposition PDPWM, PODPWM, APODPWM have been analyzed in this paper. The PWM...
This paper addresses the common mode (CM) electromagnetic noise issues in two switch forward converter. The two switch forward converter has low common mode noise compared to other topologies because its symmetric primary side circuit has two out of phase dv/dts that cancel each other. However parasitic capacitances of the circuit significantly affect the symmetry and degrade the noise reduction....
A buck converter is a step-down AC to DC converter. By eliminating input bridge diodes, the rectifier's efficiency is further improved. More over the rectifier doubles its output voltage which extends usable energy of the buck capacitor after a drop out of the line voltage. In conventional method a bridgeless buck rectifier also works as a voltage doubler, it can be designed to meet harmonic limit...
Multilevel Inverter (MLI) has been recognized as an attractive topology for high voltage DC-AC conversion. Function of a multilevel inverter is to synthesize a desired voltage wave shape from several levels of DC voltages. But the main drawback of MLI is its output voltage amplitude is limited to DC sources voltage summation. To overcome this limitation, a five-level cascaded multilevel inverter based...
A new method to reduce the torque ripple and current harmonics is presented in this paper. A conventional 2 level inverter is fed with two inductor boost converter to drive the induction motor. A Hybrid Pulse Width Modulation (HPWM) algorithm is being used to generate the pulses for the 2 level inverter. In proposed hybrid PWM both continuous PWM and discontinuous PWM techniques are employed. This...
Presently, many industrial processes require high performance switching control of a number of inverter-fed induction machines. Multi-motor drives employ various methods to reduce complexity and minimize the cost. Independent control of motors is required as these motors are subjected to frequently changing operating conditions. Recent researches have ascertained the independent control of parallel...
The work proposes a new real time Harmonic Elimination Pulse Width Modulation (HEPWM) technique for Voltage Source Inverters which is a useful alternative over SPWM (Sinusoidal Pulse Width Modulation) for high power inverters used in the mains and drives. HEPWM provides ideal solution for switching losses in inverters when operated in low frequency range. The switching angle of the HEPWM can be calculated...
Multilevel inverter is a new breed of power converter which is suited for high power applications. The various topologies of multilevel inverter are diode - clamped, capacitor clamped and cascaded H-bridge inverter. It is an effective solution for increasing the number of levels in output waveform with reduced dc sources and switching elements, thereby dramatically reduces harmonics without increasing...
This paper presents the development of three different generalized PWM schemes for a n-phase voltage source inverter (VSI) in matlab/simulink. Multiphase (n-phase) voltage source inverters are dominantly used to supply the multi-phase drives which are used for high power applications. It is necessary to develop suitable switching schemes for the inverters to provide required output voltages to a multiphase...
This Paper deals with the Zero current transition technique, which provides Zero current switching turn off of the main switch and auxiliary switch without additional Conduction loss and current stress. The auxiliary cell consists of switch, a auxiliary diode, a resonant inductor, a resonant capacitor. The auxiliary cell is an parallel with the main switch. The zero current switching condition of...
The latest buzzword, in energy conscious industries, is the improvement of power quality. Good quality of electric power can not only result in handsome savings in power bills but also helps in avoiding unwarranted breakdowns. This paper aims at analyzing the reasons for poor quality of power and solutions for improving it. The change in magnitude and power factor can be corrected without much of...
Analysis and technique for harmonic elimination is introduced in this paper. The proposed technique eliminates harmonics component from the periodic waveform and it requires only knowledge of fundamental frequency of the periodic waveform. This technique utilizes multipliers, unit delay, adder and subtractor. Adaptation process exactly matches amplitude and phase of fundamental frequency component...
Brushless DC (BLDC) motors are widely used for many industrial applications because of their high efficiency, high torque and low volume. The aim of this research is to develop a complete model of the BLDC motor and to design an optimal controller for its position control. Generally PID controller is used for many control problems because of its simple structure and easy implementation. However in...
The main objective of this paper is to achieve low cost BLDC driver by the reduction of switch device, cost down of control, and saving of hall and current sensors. In this paper, a simple position sensor less control strategy for four-switch three-phase BLDC motor drives using closed loop PWM controller technique and FPGA (Field Programmable Gate Array) is proposed. Four-switch inverter can reduce...
In this paper, the space vector modulation technique for an neutral point clamped (NPC) three-level Inverter is described and investigation of the common mode voltage rejection also done. Based on the two level inverter, the paper further deals with space vector PWM technique for an three level inverter with 19 of 27 available voltage vectors are used in order to reduce the amplitude of CM voltage...
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