Various Topology of Multilevel Inverter Used for Minimization of Total Harmonics (original) (raw)
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A Comparative Study between Different Types of Multilevel Inverter
IRJET, 2022
This paper compares between four different topologies of cascaded H-bridge multilevel inverter. Inverter can be defined as a power electronic device which can convert dc to ac at specified output voltage and frequency. Multilevel inverters are the preferred choice of industry for application in high voltage and high power. The basic advantage of a multilevel inverter is that it can give high power at the output while working under medium voltage source. It does so with the help of multiple dc sources at the input. The main merits of the paper are Comparative Study of Different Types of Multilevel Inverter and also study on minimizing the total harmonic distortion which will help the designer to design an appropriate multilevel inverter.
Evaluation of Different Multilevel Inverter Topologies for Harmonics and Power Losses
International Journal for Research in Applied Science and Engineering Technology, 2017
With the emission norms becoming more stringent and escalating cost of hydrocarbon fuels automotive companies are developing Electric Vehicles (EV), Hybrid Electric Vehicles (HEVs), and Plug-in Hybrid Electric Vehicles (PHEV). All this vehicles need a traction motor and a power converter to drive the traction motor. The requirements for the power converters include high peak power, optimum consumption of energy, low output harmonics and inexpensive circuit. One of the promising technologies that can be made to meet these requirements is Multilevel Inverters (MLI). This paper discusses the three types MLI namely of diode clamped, cascaded H-bridge, and reduced switch multilevel inverters (MLI). This paper focuses on evaluation of harmonics and power losses in the above inverter topologies. Based on the simulation results obtained it is found that Total Harmonic Distortion (THD) of MLI is less compared to H-Bridge inverter where as power loss in H-Bridge inverter is less compared to MLI.
International Journal of Engineering Research and Technology (IJERT), 2021
https://www.ijert.org/comparative-analysis-of-cascaded-h-bridge-multilevel-inverters-in-reducing-harmonic-distortion-by-eppwm-and-pdpwm-techniques https://www.ijert.org/research/comparative-analysis-of-cascaded-h-bridge-multilevel-inverters-in-reducing-harmonic-distortion-by-eppwm-and-pdpwm-techniques-IJERTV10IS060179.pdf Multilevel inverter (MLI) technologies are suitable for conversion in renewable sources and high-power industrial applications due to their many advantages such as low power dissipation on power switches, low harmonic contents, high power rating and high efficiency that can be achieved without using transformer. Multi-level inverter is a DC to AC power convertor which is implemented using power electronic semiconductor switches like IGBT or MOSFET. The proposed system uses Equal Phase (EP) and Sinusoidal pulse width modulation (SPWM) method for generating gating/firing signal in the multilevel inverter to convert DC voltage from battery storage to supply AC loads. In the EP method, the effectiveness of eliminating low-order harmonics in the inverter output voltage is studied and compared to that of the sinusoidal PWM method. In SPWM, Phase Disposition (PD) PWM method is used to control the output of multilevel inverter. The distortion of the output voltage decreases and rms output voltage increases as the number of level increases. This paper presents the simulation and comparative analysis of the single phase three, five, seven and eleven level inverters. All the topologies are modelled using MATLAB/Simulink and the results are validated and compared.
Three Stage Cascaded Multilevel Inverter using Pulse Width Modulation Technique
In the last few years, the necessity of increasing the power quality enhancement in industry has sustained the continuous development of multilevel- inverters due to high efficiency with low switching frequency control method. The inverter is a semiconductor device which is used to convert the fixed DC voltage into symmetrical AC voltage without changing the magnitude. To improve the power quality (AC) from the inverter output by performing the power conversion in small voltage steps resulted in lower harmonics. The output voltage on the AC side can take several discrete levels of equal magnitude. The harmonic content of this output voltage waveform is greatly reduced, if compared with a two level voltage wave form (inverter). This method is called as multilevel inverter. Multi-level power inverters employ power semiconductor switches in the inverter to select one or more of multi dc voltage source to create staircase voltage waveform at the inverter output. In the multilevel inverter the output voltage is in the form of stepped waveform, so that the harmonics will be reduced and thereby increase the voltage gain and power quality of the output AC from the MLI.
Comparative Study of Three level and Five level Inverter
This paper analyses and compares the different cascaded H-Bridge multilevel inverter used for dc to ac power conversion. The simulation of multilevel inverters is done in MATLAB/SIMULINK software.The activepoweroutput,reactive power output and Total Harmonic Distortion (THD) in output voltage produced in 3-level and 5-level inverters are obtained and compared.It was observed that THD in 5-level inverteris less as compared to 3-level inverter & THD in 7-level inverter is less as compared to 3-level and 5-level inverter. KEYWORDS: Cascaded H-Bridge Multilevel Inverter,Three level inverter.Five level inverter,Comparison. I.INTRODUCTION The use of renewable energy sources is increasing to supply the increasing demand of electricity due to urbanisation. Solar energy produces dc power which needs to be converted into ac for further applications. Conversion of dc power to ac is done using cascaded H bridge multilevel inverter with less THD. The high power cascaded H bridge multilevel inverter should be analysed with respect to its output active power, reactive power and THD in output voltage. This study will help the design engineer in selecting the appropriate multilevel inverter for required application. Multilevel inverters are classified as current source inverter and voltage source inverter. In case of multilevel current source inverter, it was observed that if there is short circuit in the circuit, the fault current will be very high further damaging the other equipment's connected in the circuit. Therefore multilevel voltage source inverters are more commonly used [3].Multilevel voltage source inverters are classified into three main categories as (i) cascaded H-bridge multilevel inverter, (ii) Neutral point clamped multilevel inverter and (iii) Flying capacitor multilevel inverter. Cascaded H bridge multilevel inverter is more commonly used because it gives high output voltage, reliability, power levels and simplicity of control. II.CASCADED H-BRIDGE MULTILEVEL INVERTER The cascaded H-Bridge multilevel inverter are the most advanced and important method of power electronic converters that analyses output voltage with number of dc sources as inputs.As compared to neutral point clamped multilevel inverter and flying capacitor multilevel inverter,the cascaded H-Bridge multilevel inverters requires less number of components and it reaches high quality output voltage which is close to sinewave. By increasing the number of output levels the total harmonic distortion in output voltage can be reduced.In cascaded H-Bridge multilevel inverterrequired AC output voltage is obtain by synthesizing number of DC sources.The number of H-Bridge units with different DC sources is connected in series or cascade to produce cascaded H-Bridge multilevel inverter[4]. III.SINGLE PHASE 3-LEVEL CASCADED H-BRIDGE MULTILEVEL INVERTER Fig 1 shows Single phase Three level Cascaded H-Bridge inverter consisting of single isolated DCsource,four IGBT switches& R-L load. The result of output voltage waveform of three level multilevel inverter is shown in fig 3.consists of three levels 0,+Vdc,-Vdc[1].
Study Of The Modulation Schemes In The Hybrid Three-phase Multilevel Inverter
Eletrônica de Potência, 2018
This work proposes and analyzes modulation strategies for a hybrid three-phase multilevel inverter, which employs two different topologies in a cascade connection, a three-phase Neutral Point Clamped (NPC) converter and single-phase half-bridge converters. Two different modulation schemes are proposed: the hybrid modulation and the space vector modulation. The both modulation schemes can synthesize five voltage levels in the output phase voltage at the hybrid three-phase multilevel inverter with symmetrical dc sources. The modulation schemes operate the three-phase NPC in low-switching frequency and the half-bridge converters in high-switching frequency. Thus, semiconductors with low conduction losses can be used for three-phase NPC, decreasing the semiconductor losses. The hybrid three-phase multilevel inverter structure and modulation schemes are explained in detail and verified by simulation and experimental results.
Performance Analysis of Three Phase Cascaded Multilevel Inverter
In this paper, a modular cascaded H-bridge multilevel inverter for single-phase and three-phase renewable applications has been described. HCMMLI (Hybrid Cascaded Modular Multilevel Inverter) is one of the useful power electronic interface strategy for PV system The primary operation of single phase module and the cascaded hybrid inverter has been explained in this paper. The operation of symmetrical mode has been analyzed. The Nearest Level Control method of multilevel inverter topology is discussed. With this topology, less number of switches could be used which reduces switching losses and harmonic distortion. The size and cost of the system is reduced with the reduced power switches. In this paper, the main focus is on utilization of above discussed topology for several H Bridge configuration with equal and unequal magnitude of DC source. This configuration are considered to be symmetrical and asymmetrical. Here, in order to find an optimum arrangement with high quality output voltage, the comparison of symmetrical, binary asymmetrical and trinary asymmetrical topologies are analyzed.
Comparative Analysis of Three Topologies of Three-Phase Five Level Inverter
This paper presents the simulation and analysis of the three topologies of three phase 5-level inverter. We have considered the Flying Capacitor Multilevel Inverter (FCMLI), the Neutral Point Clamped or the Diode Clamped Multilevel Inverter (NPCMLI or DCMLI) and the Cascaded H-Bridge Multilevel Inverter (H-bridge MLI). The comparison between these inverters is based on the %THD present in the output voltage. Each inverter is controlled by the multi-carrier sinusoidal pulse width modulation (SPWM). The analysis shows that the total harmonic distortion (THD) is approximately 23% for DCMLI and 22% for PWM H-Bridge topologies, and it is about 24% for the FCMLI topology. The comparative results of the harmonic analysis have been obtained in MATLAB/SIMULINK.
International Journal of Engineering Research and Technology (IJERT), 2019
https://www.ijert.org/Cascade-Multilevel-Inverter-as-a-Solution-to-Improve-the-Voltage-Level-and-Reduce-the-Harmonics https://www.ijert.org/research/cascade-multilevel-inverter-as-a-solution-to-improve-the-voltage-level-and-reduce-the-harmonics-IJERTCONV7IS02044.pdf The cascaded multilevel inverter (CMLI) has gained much attention in recent years due to its advantages in high voltage and high power with low harmonics applications. A standard cascaded multilevel inverter requires n DC sources for 2n+1 levels at the output, where n is the number of inverter stages. This paper presents a topology to control cascaded multilevel inverter that is implemented with multiple DC sources to get 2 n+1-1 levels. With using Pulse Width Modulation (PWM) technique, the firing circuit can be implemented which greatly reduces the Total Harmonic Distortion (THD) and switching losses.