scholarly journals A New Asymmetrical MLI with Reduced Switch Count for a Three Phase Induction Motor

2020 ◽  
Vol 9 (7) ◽  
pp. 728-737
Keyword(s):  
Induction Motor ◽  
Output Voltage ◽  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Circulating Current ◽  
Three Phase ◽  
Power Switches ◽  
Frequency Components ◽  
Sinusoidal Shape ◽  
Bidirectional Switches

This work explores a novel multilevel inverter (MLI) topology to minimize the number of power switches in the passage of current to accomplish each level of the output voltage. The unequal magnitudes of the dc voltage sources in attempt to realize higher levels of the output voltage bring in the asymmetrical nature of operation. It involves a series parallel switched configuration with bidirectional switches to avert the flow of circulating current in between the two H - bridges in each phase of the MLI. The effort incites to use the theory of a new Pulse Width Modulation (PWM) strategy for mitigating the higher frequency components of the voltage applied to the stator. It imbibes the Phase Disposition (PD) principles in the modulating strategy for arriving at the sinusoidal shape for the output voltage . Total Harmonic Distortion (THD) indexed by lower values for the output voltage over the traditional firing scheme serves to be the highlight for the MLI in acclaiming its place in the inverter world. The results obtained through MATLAB based simulation over a range of modulation indices. The performance measured in terms of the THD claims its suitability for use in Induction Motor (IM) drives.

New series parallel switched multilevel inverter for a three phase induction motor

2016 ◽  
Vol 24 (8) ◽  
pp. 1440-1454 ◽  
Author(s):  
R Geetha ◽  
M Ramaswamy
Keyword(s):  
Induction Motor ◽  
Output Voltage ◽  
Pulse Width Modulation ◽  
Multilevel Inverter ◽  
Sinusoidal Voltage ◽  
Three Phase ◽  
Frequency Components ◽  
Simulation Results ◽  
Improved Performance ◽  
Inverter Topology

The paper develops a new topology for a three phase multilevel inverter with a view to reduce the number of switches in the path of the current. It encompasses a mechanism to reach the desired target voltage and in turn enable the three phase induction motor to operate at the specified speed. The formulation incorporates the theory of an appropriate pulse width modulation strategy to ensure the elimination of higher frequency components of the output voltage. The use of relatively smaller number of carriers in the process of generating the switching pulses serves to enhance the output voltage spectrum. The intriguing merits of the phase disposition over the other modulation schemes enable to arrive at a nearly sinusoidal voltage. The performance obtained from the prototype substantiate the MATLAB based simulation results and establish the ability of the series parallel switched multilevel inverter topology to offer an improved performance for the induction motor.

A new three-phase multilevel DC-link inverter topology with reduced switch count for photovoltaic applications

Circuit World ◽  
2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Anbarasan P. ◽  
Krishnakumar V. ◽  
Ramkumar S. ◽  
Venkatesan S.
Keyword(s):  
Power Loss ◽  
Output Voltage ◽  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Photovoltaic Cell ◽  
Content Type ◽  
Energy Applications ◽  
Three Phase ◽  
Photovoltaic Applications ◽  
Inverter Topology

Purpose This paper aims to propose a new MLI topology with reduced number of switches for photovoltaic applications. Multilevel inverters (MLIs) have been found to be prospective for renewable energy applications like photovoltaic cell, as they produce output voltage from numerous separate DC sources or capacitor banks with reduced total harmonic distortion (THD) because of a staircase like waveform. However, they endure from serious setbacks including larger number of capacitors, isolated DC sources, associated gate drivers and increased control difficulty for higher number of voltage levels. Design/methodology/approach This paper proposes a new three-phase multilevel DC-link inverter topology overpowering the previously mentioned problems. The proposed topology is designed for five and seven levels in Matlab/Simulink with gating pulse using multicarrier pulse width modulation. The hardware results are shown for a five-level MLI to witness the viability of the proposed MLI for medium voltage applications. Findings The comparison of the proposed topology with other conventional and other topologies in terms of switch count, DC sources and power loss has been made in this paper. The reduction of switches in proposed topology results in reduced power loss. The simulation and hardware show that the output voltage yields a very close sinusoidal voltage and lesser THD. Originality/value The proposed topology can be extended for any level of output voltage which is helpful for sustainable source application.

scholarly journals Novel approach for SVPWM of two-level inverter fed induction motor drive

2020 ◽  
Vol 11 (4) ◽  
pp. 1750
Author(s):  
Olwi A. Elkholi ◽  
Mohamed A. Enany ◽  
Ahmed F. Abdo ◽  
Mahmoud Eid
Keyword(s):  
Induction Motor ◽  
Pulse Width Modulation ◽  
Frequency Converter ◽  
Harmonic Distortion ◽  
Motor Drives ◽  
New Approaches ◽  
Novel Approach ◽  
Three Phase ◽  
Dc Bus ◽  
Bus Voltage

<p class="Abstract">Due to their better DC bus utilization and easier digital realization, Space Vector Pulse Width Modulation (SVPWM) scheme is the most widely used PWM scheme. Also two level inverter is the traditional frequency converter because it has fewer components and is lower complex to control, but on the other hand it generates higher harmonic distortion. This paper presents the realization of novel SVPWM approaches applied to the three phase induction motor drives. Specifically various schemes are based on using more combinations of step operation in each cycle to approximate the reference vector, such as 24 and 48 step operations in each cycle. The basic principle of conventional SVPWM with different modulation index M is presented. The switching sequences of new approaches are described. The modulation signals waveforms, DC bus voltage utilization, De-rated motor torque, standard error of average torque, voltage and current harmonic of new approaches are analyzed by the MATLAB/SIMULINK software. The results confirms that 48 step SVPWM approach is the best compared to other approaches.</p>

scholarly journals Implementation of the conventional seven-level single-phase symmetrical cascaded h-bridge MLI based on PSIM

2020 ◽  
Vol 11 (1) ◽  
pp. 169
Author(s):  
Hassan Salman Hamad
Keyword(s):  
Electromagnetic Interference ◽  
Output Voltage ◽  
Single Phase ◽  
Pulse Width Modulation ◽  
Feasible Solution ◽  
Harmonic Distortion ◽  
Operating Principle ◽  
Multilevel Inverters ◽  
Simulation Performance ◽  
Power Switches

<span>Researchers<strong> </strong>have found interest in the multilevel inverters (MLI) owing to the low total harmonic distortion (THD) associated with their output voltage, as well as their low electromagnetic interference (EMI). The MLI represents an effective and feasible solution for enhancing power demand and minimizing AC waveforms’ harmonics as they generate a preferred level of output voltage as inputs from varying levels of DC voltages. In this paper, the performance of a seven-level cascaded H-bridge MLI with an asymmetrical number of power switches was evaluated. The simulation performance is shown to validate the operating principle of the single-phase cascaded H-bridge inverter. To control the MLI, a pulse width modulation approach was utilized. The operating principle of the MLI was verified via simulation using PSIM software.</span>

scholarly journals Investigation of Passive Filter Performance on Three Phase DC to AC Converter

2018 ◽  
Vol 9 (3) ◽  
pp. 1016
Author(s):  
S.Z. Mohammad Noor ◽  
N. Rosmizi ◽  
N. Aminudin ◽  
Faranadia A.H
Keyword(s):  
Output Voltage ◽  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Switching Frequency ◽  
Power Circuit ◽  
Matlab Simulink ◽  
Passive Filter ◽  
Insulated Gate Bipolar Transistor ◽  
Filter Performance ◽  
Three Phase

<p>This work presents investigation of passive filter performance on three-phase inverter with 180° conduction mode. The simulation model of the inverter is developed by using MATLAB/Simulink. The power circuit used Insulated Gate Bipolar Transistor (IGBT) as switching device. The inverter is controlled by using bipolar Sinusoidal Pulse Width Modulation (SPWM) technique. The IGBT was set to 25 kHz for switching frequency (fs). Three types of passive filters which are LC, RC and PI filters are used to investigate the ability to remove the unwanted signal that occurred on the inverter. The result is analyzed based on the performances of output filter in term of Total Harmonic Distortion in voltage (THD<sub>v</sub>), current (THD<sub>i</sub>), shape of output voltage and current. The THD must be less than 5% at rated inverter output voltage or current by referring to IEC 61727 Standard. The passive filter is modeled in MATLAB/Simulink environment to study the characteristics and performance of the filters.</p>

New Topology for Asymmetrical Multilevel Inverter: An Effort to Reduced Device Count

2017 ◽  
Vol 27 (04) ◽  
pp. 1850055 ◽  
Author(s):  
Kishor Thakre ◽  
Kanungo Barada Mohanty ◽  
Vinaya Sagar Kommukuri ◽  
Aditi Chatterjee
Keyword(s):  
Output Voltage ◽  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Dc Voltage ◽  
Experimental Implementation ◽  
Voltage Stress ◽  
Power Switches ◽  
Driver Circuit ◽  
Gate Driver

Nowadays, multilevel inverters (MLI) are receiving remarkable attention due to salient features like less voltage stress on switches and low total harmonic distortion (THD) in output voltage. However, the required switch count increases with number of voltage levels. This paper presents a new topology for asymmetric multilevel inverter as a fundamental block. Each block generates 13-level output voltage using eight switches and four unequal dc voltage sources. The proposed configuration offers special features such as reduced number of switches, isolated dc sources, cost economy, less complex and modular structure than other similar contemporary topologies. Moreover, significant reduction in voltage stress on the circuit switches can be achieved. Comparative studies of proposed topology with the conventional and recent topologies have been presented in terms of power switches, gate driver circuit requirement, isolated dc voltage sources and total standing voltage. Multicarrier-based sinusoidal pulse width modulation (SPWM) scheme is adopted for generating switching signals using dSPACE real-time controller. In addition, proposed topology offers a fewer number of ON-state switches that lead to reduction in power loss. The proposed topology is validated through simulation and experimental implementation.

A Symmetrical Multilevel Inverter Topology with Minimal Switch Count and Total Harmonic Distortion

2020 ◽  
Vol 29 (11) ◽  
pp. 2050174 ◽  
Author(s):  
Kavali Janardhan ◽  
Arvind Mittal ◽  
Amit Ojha
Keyword(s):  
Output Voltage ◽  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Total Harmonic Distortion ◽  
Lookup Table ◽  
Control Technique ◽  
Power Switches ◽  
Dspace 1104 ◽  
Working Principle

A multilevel inverter (MLI) with reduced number of power devices, especially for the higher output levels, is presented in this paper. The generalized topology for ([Formula: see text]) level MLI is developed with symmetrical isolated dc sources and ([Formula: see text]) number of switches. A five-level MLI is developed with five power switches and then by adding each one additional switch two more levels are added in the output voltage waveform. With the help of lookup table, the working principle of the proposed five-level MLI topology is explained. Sinusoidal pulse width modulation–phase disposition control technique has been used to get a minimal total harmonic distortion (THD). The proposed MLI topology is simulated on the MATLAB platform. The laboratory prototype is developed for five-level MLI, and the experimental results obtained validate the simulation studies. The dSPACE 1104 is used for generating gate pulses in case of experimentation. The output voltage and current THDs obtained are 9.20% and 4.60%, respectively; the harmonics are mitigated more with five-level inverter. The proposed topology is compared with the cascaded H-bridge multilevel inverter.

scholarly journals A Multicarrier PWM Technique for Five Level Inverter Connected to the Grid

2018 ◽  
Vol 9 (4) ◽  
pp. 1774
Author(s):  
M. Khanfara ◽  
R. El Bachtiri ◽  
M. Boussetta ◽  
K. El Hammoumi
Keyword(s):  
Spectral Analysis ◽  
Pulse Width ◽  
Output Voltage ◽  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Passive Filter ◽  
Renewable Power ◽  
Three Phase ◽  
Simulation Results ◽  
Multicarrier Pwm

In this paper, a three-phase multilevel cascaded H-bridge inverter is developed for injecting renewable power energy into the grid through a filter. The main contribution of this work is to reduce the total harmonic distortion (THD) by using a passive filter and to enhance the output voltages by adopting a multicarrier pulse width modulation (MCPWM). The simulation results affirm a good performance of the proposed multicarrier PWM control using a three-phase five-level inverter. The proposed inverter is tested as well as the THD and the spectral analysis of the output voltage are calculated using Simulink/Matlab software.

scholarly journals Three Phase Eleven Level Modular Multilevel Inverter with PD-PWM for Grid Connected System

2020 ◽  
pp. 86-91
Author(s):  
P Yogini Dr. Sujatha Balaraman,
Keyword(s):  
Pulse Width ◽  
Output Voltage ◽  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Utilization Factor ◽  
Multilevel Inverters ◽  
Three Phase ◽  
Conversion System ◽  
Effective Use

The prominence of Modular Multilevel Inverters (MMI) is rising owing their merits of simple mechanical construction and good voltage sharing for semiconductor devices. Mostly Multilevel Inverters use more than one source; however, the effective use of all the sources at all levels is rare. Conventional Multilevel Inverters will diminish the energy efficiency of the conversion system. When compared to conventional multilevel inverter, Modular Multilevel Inverter with a high numbers of voltage levels seem to be the most suitable because of the use of an isolated dc source. This paper explores a three-phase eleven level modular multilevel inverter with phase disposition pulse width modulation technique (PD-PWM) that can extract power from all the sources at all the levels. Besides, this paper develops a synchronous d-q reference frame controller to control the current of 11kV. When compared with Reduced Switch Count based Multilevel Inverter Series/Parallel switching topologies, the Modular Multilevel Inverter provides better Total Harmonic Distortion (THD) of output voltage and utilization factor.

Simulation and dSPACE Based Implementation of Various PWM Strategies for A New H-Type FCMLI Topology

2015 ◽  
Vol 6 (3) ◽  
pp. 615
Author(s):  
Chinnapettai Ramalingam Balamurugan ◽  
S.P. Natarajan ◽  
T.S. Anandhi ◽  
B. Shanthi
Keyword(s):  
High Voltage ◽  
High Power ◽  
Output Voltage ◽  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Crest Factor ◽  
Third Harmonic ◽  
Switching Losses ◽  
Three Phase ◽  
Inverter Topology

<p>Depending on the number of levels in output voltage, inverters can be divided into two categories: two level inverter and Multi Level Inverters (MLIs). An inverter topology for high voltage and high power applications that seems to be gaining interest is the MLI. In high power and high voltage applications, the two level inverters have some limitations in operating at high frequency mainly due to switching losses and constraints of device rating.In this paper, a three phase H + type FCMLI (Flying Capacitor MLI) using sinusoidal reference, third harmonic injection reference, 60 degree reference and stepped wave reference are initially developed using SIMULINK and then implemented in real time environment using dSPACE. In H-type FCMLI with R-load it is inferred that bipolar COPWM-C provides output with relatively low distortion for 60 degree reference and bipolar COPWM-C strategy is found to perform better since it provides relatively higher fundamental RMS output voltage for THI reference. The five level output voltages of the chosen MLIs obtained using the MATLAB and dSPACE based PWM (Pulse Width Modulation) strategies and the corresponding %THD (Total Harmonic Distortion), V<sub>RMS</sub> (fundamental), CF (Crest Factor) and FF (Form Factor) are presented and analyzed.</p>

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