review study of multilevel inverter (original) (raw)
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Cascaded H-Bridge Multilevel Inverter Using SPWM and MSPWM Strategies
Nowadays, the multilevel inverter is growing hugely in medium voltage-high power applications. It produces staircase output voltage near sinusoidal waveform. The multilevel inverter is as compared to a two level inverter has high output voltage at high switching frequency , less EMI (electromagnetic interference), lower THD (total harmonics distortion), low voltage stress (dv/dt) and it reduces the size of the filter components. In this paper various techniques cascaded H-bridges inverter are designed and implemented. Single phase sinusoidal pulse width modulation (SPWM) and modified sinusoidal pulse width modulation (MSPWM) topologies of (three, five and seven) levels inverters are designed and implemented. The results in percentage value of THD before and after filter are compared. The simulink/matlab and proteus are used to simulate the systems and finally, result are obtained experimentally using microcontroller (arduino mega 2560). When the number of levels is increased using SPWM technique the THD reduced, THD improves in MSPWM technique too, and comparison table II illustrated that.
European Journal of Electrical Engineering, 2021
The paper introduces the cascaded H-Bridge multi-level inverter with single-phase arrangement connected series with full-bridge inverter and CHBMLI configuration integrated with Double level circuit is proposed to reduce the harmonic distortion to get high power quality. In the proposed configuration, a half-bridge inverter has been implemented to increase the output voltage waveform nearly twice as compared with the conventional Cascaded H-Bridge MLI. For high Power quality, the output voltage waveform with the reference of sinusoidal, the phase opposition disposition carrier arrangement has been utilized in PWM for producing gate pulse of switches. The high waveform of output voltage achieved with the less no of switches, less % THD distortion, less conduction and switching losses. The purposed symmetrical model of CHBMLI is successfully verified using MATLAB based on simulation with DLC configuration.
This paper proposes comparison between symmetrical and asymmetrical Cascaded H-Bridge Multilevel Inverter (CMLI) using the multicarrier based SPWM Technique with induction motor as a load. Multilevel inverter have become more popular over the years in high power medium voltage application without the use of the transformer and with less disturbance & reduced harmonic distortion. In this paper three phase configuration of cascaded h-bridge multilevel inverter are studied. Here, carrier based sinusoidal pulse width modulation (SPWM) Technique is used as the modulation strategy. In this modulation strategy include the phase disposition technique (PD), phase opposition disposition technique (POD), and an alternative phase opposition disposition technique (APOD). All the study of the technique has been carried out the MATLAB/SIMULINK and evaluation of CMLI using SPWM technique in terms of THD. Keywords Cascaded H-bridge multilevel inverter (CMLI), Sinusoidal pulse width modulation (SPWM) technique, and Total harmonic distortion (THD).
A five level cascaded H-bridge inverter based on space vector pulse width modulation technique
Multilevel inverters brought a tremendous revolution in high power superior performance industrial drive applications. Minimizing harmonic distortion is a challenging issue for power electronic drive. This problem can be solved by developing suitable modulation technique. There are number of modulation techniques established in the last decade. Among them, the space vector pulse width modulation (SVPWM) is extensively used because of their easier digital realization, better DC bus utilization and lower THD. Conventional SVPWM requires different number of logical computations of on time calculations and different number of lookup table for each triangle due to having their different number of switching states. In this paper, a simple SVPWM is presented where proposed only four logical computations of on time calculation, four active switching states and four lookup table for each triangle. Five level cascaded h-bridge inverter (CHBI) based on SVPWM technique are modeled and analyzed by using MATLAB/Simulink and origin 6.1 with a passive R-L load that can be extended to any level. These results are compared with other lower levels of inverter and with previous established results. From these results, five level CHBI based on SVPWM shows better performance compared to others in terms of THD.
Cascaded H-Bridge Multilevel Inverter Using Inverted Sine Wave PWM Technique
2013
This paper proposes three phase Seven Level Cascaded H-Bridge Multilevel Inverter by using PD, POD, APOD, INVERTED SINEWAVE methods based on Sinusoidal PWM control techniques. There are 3 types of multilevel inverters named as diode clamped multilevel inverter, flying capacitor multilevel inverter and cascaded multilevel inverter. Compared to diode clamped & flying capacitor type multilevel inverters cascaded H-bridge multilevel inverter requires least no of components to achieve same no of voltage levels and optimized circuit layout is possible because each level have same structure and there is no extra clamping diodes or capacitors. However as the number of voltage levels m grows the number of active switches increases according to 2×(m-1) for the cascaded H-bridge multilevel inverters. By comparing the three methods the performance parameters are calculated. Performance analysis is based on the results of simulation study conducted on the operation of the multilevel inverters us...
Multilevel inverter is an effective and practical solution for increasing power demand and reducing harmonics of AC waveforms. Such inverters synthesize a desired output voltage from several levels of dc voltages as inputs. This paper analyzes the performance of cascaded five level inverter using hybrid pulse width modulation technique. It has been found that this technique reduces the switching losses and total harmonic distortion. The topology used in this technique reduces the number of power switches when compared to the conventional cascaded Hbridge multilevel inverter. The performance has been analyzed by the MATLAB/Simulink. The output shows better performance results.
International Journal of Power Electronics and Drive System (IJPEDS) , 2019
In this paper a hardware implementation of single-phase cascaded H-bridge three level multilevel inverter (MLI) using sinusoidal pulse width modulation (SPWM) is presented. There are a few interesting features of using this configuration, where less component count, less switching losses, and improved output voltage/current waveform. The output of power inverter consists of three form, that is, square wave, modified square wave and pure sine wave. The pure sine wave and modified square wave are more expensive than square wave. The focus paper is to generate a PWM signal which control the switching of MOSFET power semiconductor. The sine wave can be created by using the concept of Schmitt-Trigger oscillator and low-pass filter topology followed by half of the waveform will be eliminated by using the circuit of precision half-wave rectifier. Waveform was inverted with 180º by circuit of inverting op-amp amplifier in order to compare saw-tooth waveform. Two of PWM signal were produced by circuit of PWM and used digital inverter to invert the two PWM signal before this PWM signal will be passed to 2 MOSFET driver and a 3-level output waveform with 45 Hz was produced. As a conclusion, a 3-level output waveform is produced with output voltage and current recorded at 22.5 Vrms and 4.5 Arms. The value of measured resistance is 0.015 Ω that cause voltage drop around 0.043 V. Based on the result obtained, the power for designed inverter is around 100W and efficiency recorded at 75%.
Investigation Study of Three-Level Cascaded H-bridge Multilevel Inverter
This paper analyzed three-level Cascaded H-bridge Multilevel Inverter (CHMLI) utilizing two modulation techniques namely Sinusoidal Pulse Width Modulation (SPWM) and Space Vector Pulse Width Modulation (SVPWM). The performance and the output of CHMLI in terms of Total Harmonic Distotion (THD) % and circuits complexity were compared. The simulations models were constructed using MATLAB/SIMULINK. The results showed the CHMLI produced the lowest THD contents and utilized fewer components. Moreover, the SVPWM produced less THD than SPWM.
ANALYSIS OF CASCADED H-BRIDGE MULTILEVEL INVERTER WITH LEVEL SHIFTED PWM ON INDUCTION MOTOR
Multi-level converter technology has emerged as a very important alternative in the area of high-power medium voltage energy control. Two level inverters are those which creates a voltage or a current with levels either 0 or ±V dc. To achieve an eminence output voltage or a current waveform with a lowest amount of ripple content, they need high switching frequency. When working at high frequency, high power and high voltage applications these two level inverters have a few restrictions. The multi-level inverter is to produce a quasi sinusoidal voltage from many levels of dc voltages. The obtained output waveform has more steps, which creates a staircase wave form that reaches to a preferred wave form, as the number of levels increases. By the on and off the power switches a sequence of pulses can be produced by using SPWM or sinusoidal pulse width modulation technique which is widely used in power electronics. Sinusoidal pulse width modulation is widely used in many industrial applications and also used for so many years and it is characterized by constant amplitude pulses with dissimilar duty cycle for every period because of its circuit ease and strong control mechanism. To minimize the harmonic content and to control the output voltage of inverter the width of this pulses are modulated. Many PWM techniques are present to regulate the motor, but out of that Sinusoidal pulse width modulation or SPWM is the typically used scheme in motor control and inverter application. Finally a unipolar and bipolar SPWM voltage modulation technique is proposed because this method offers the benefit of successfully doubling the switching frequency of the inverter voltage, thus creating the output filter smaller, economical and trouble free to implement.
Design and Simulation of Five Level Cascaded Inverter Using Multilevel Sinusoidal PWM Strategies
The project we have undertaken is “Design and Simulation of Five Level Cascaded Inverter Using Multilevel Sinusoidal PWM Strategies”. Five Level Cascaded Inverter as compared to single level inverter have advantages like minimum harmonic distortion reduced EMI/RFI generation and can operate on several voltage levels. The Multi-level inverter is to synthesize a near sinusoidal voltage from several levels of dc voltages. As number of levels increases, the synthesized output waveform has more steps, which provides a staircase wave that approaches a desired waveform. Also, as steps are added to waveform, the harmonic distortion of the output wave decreases, approaching zero as the number of voltage levels increases. Three phases two level inverter is one of the popular multi-level inverter, designed using Bidirectional chopper cells. Multi-level inverter is being utilized for multipurpose applications such as active power filters, static VAR compensator and machine drives for sinusoidal and trapezoidal current applications. The active power filters are modelled with the inverters and suitable switching control strategies (PWM technique) to carry out harmonic elimination.