Multilevel Inverter Fed Induction Motor Research Articles

Effect of supply voltage variations on single-phase capacitor clamped multilevel inverter fed induction motor drive

This article presents the effect of supply voltage variations on single-phase capacitor-clamped multilevel inverter-fed induction motor drives. This research is tailored at determining the best torque value and speed to attain a stable state under input voltage variation and minimum time response to realize low percentage harmonic distortions. The effect of constant power quality disturbance harms the performance and behavior of asynchronous motors based on harmonic contents and other energy source integrations. The multilevel inverter has shown good performance in motor drives. This paper deals with the effect of input voltage variations on a single-phase multilevel capacitor-clamped inverter for asynchronous induction motor drives. A five-level capacitor-clamped inverter with an in-phase disposition pulse width modulation technique is adopted. Four high-frequency triangular carrier signals are generated and compared with a reference sinusoidal signal. As a result of this approach, the inverter switches firing signals are generated. The open-loop model is designed and simulated utilizing MATLAB/Simulink and results based on different values of supply voltage are presented. The current and voltage total harmonic distortions (THDs) obtained are 4.97% and 4.46% respectively at the best operating voltage of 400 V and at maximum torque of 47 Nm.

PI Controller and Space Vector Modulation based Direct Torque Control of Multi-level Inverter fed Induction Motor

Managing speed and Torque in various applications can raise the AC motor's efficiency and significantly save energy. Direct Torque Control (DTC) is significant among the several methods used to regulate AC motors. It is well known that the DTC of AC motors has very favorable control performance and implementation qualities. The control strategy uses the stator flux field orientation to control Torque and flux. DTC makes it possible to manage speed and Torque over a huge range. With a squirrel-cage induction motor model, a cascaded H bridge multi-level inverter, and a PI controller, this work makes an effort to examine and analyze the characteristics and operating principle of the DTC scheme. MATLAB/SIMULINK simulation results have been used to validate the efficacy and viability of this regulating strategy.

Loss minimization in Quadratic Boost Converter Multilevel Inverter fed induction motor system by Tuning of FOPID controller using PSO

Particle swarm optimization algorithm (PSO) is suggested to discover fractional order PID (FOPID) controller optimal variables for a better performance of induction motor. This PSO algorithm is designed to handle multiple optimization issues, due to its ease of application. A Closed Loop Quadratic Boost Converter Multilevel Inverter Fed Induction Motor (QBCMLIIM) system is simulated to earn reduced switching losses and reduced THD by incorporating particle swarm optimization(PSO) tuned Fractional Order PID controller. PSO stands to be one of the popular Artificial Intelligence (AI) method. The PSO algorithm starts its process from the initial particles by allotting initial velocities to the particles. At each location the objective function and the corresponding best values are evaluated. The double loop feedback system enhances the performance and robustness by suppressing the oscillations and overshoots.

Reduction in Selected Torque Harmonics in a Three-Level NPC Inverter-Fed Induction Motor Drive

The reduction or elimination of selected torque and current harmonics is widely used in multilevel inverter fed induction motor drives. A wide range of methods are employed to achieve this goal. Those modes of operation allow the avoidance of certain torque and current harmonics that may lead to disturbance and even mechanical and electrical resonance. In this paper, the selective harmonic elimination technique (SHE-PWM) is employed to reduce the chosen torque harmonics in a three-level NPC inverter-fed induction motor drive. The proposed method is compared with the synchronized carrier pulse width modulation technique (SCPWM). For both schemes of control simulation, a model is proposed using Simulink software. Furthermore, laboratory stand experiments are carried out to verify the correctness of torque harmonics formation.

Wavelet Transform Based Fault Identification and Reconfiguration for a Reduced Switch Multilevel Inverter Fed Induction Motor Drive

The multilevel inverter-based drive system is greatly affected by several faults occurring on switching elements. A faulty switch in the inverter can potentially lead to more losses, extensive downtime and reduced reliability. In this paper, a novel fault identification and reconfiguration process is proposed by using discrete wavelet transform and auxiliary switching cells. Here, the discrete wavelet transform exploits a multiresolution analysis with a feature extraction methodology for fault identification and subsequently for reconfiguration. For increasing the reliability, auxiliary switching cells are integrated to replace faulty cells in a proposed reduced-switch 5-level multilevel inverter topology. The novel reconfiguration scheme compensates open circuit and short circuit faults. The complexity of the proposed system is lower relative to existing methods. This proposed technique effectively identifies and classifies faults using the multiresolution analysis. Furthermore, the measured current and voltage values during fault reconfiguration are close to those under healthy conditions. The performance is verified using the MATLAB/Simulink platform and a hardware model.

Multiwinding Transformer Fed CHB Inverter With On-Line Switching Angle Calculation Based SHE Technique for Vector Controlled Induction Motor Drive

A multiwinding transformer for ac–dc converter with multilevel inverter fed induction motor drive (IMD) is presented in this article. An 18 pulse ac–dc conversion is used on input side of the IMD, to meet the power quality requirement as per the IEEE-519 standard. At IM side, a ternary configured nine-level cascaded H-bridge (CHB)-inverter is used to enhance the response of the IMD. A simple online calculation of switching angles and its implementation of selective harmonic elimination strategy, are proposed to control a nine-level CHB-inverter. In this article, a nine-level CHB-inverter is operated at fundamental frequency switching for reducing the losses and suppressing the lower order harmonics (fifth, seventh, and eleventh) to a negligible value and to enhance the torque profile of the IMD. The performances of IMD are evaluated in MATLAB-Simulink environment and then simulated results are verified by test results taken from developed prototype in the laboratory to show its effectiveness for medium power applications.

Evaluation of POD and APOD multicarrier SPWM techniques for three-phase seven-level diode clamped multilevel inverter fed induction motor drive using FPGA

Multilevel inverters have drawn tremendous interest in high power high voltage applications due to their merits such as reduced voltage stress on switches, lower EMI problems and reduction in THD. The MLI technology is also advantageous in improving output waveforms due to the higher number of levels in the waveform of output voltage along with a reduced input filter size which is useful for grid connected applications. This paper focuses on implementation of three-phase diode clamped multilevel inverter fed induction motor drive using various multicarrier-based sinusoidal pulse width modulation techniques. The performance analysis of the inverter is carried out using phase opposition disposition (POD) and alternate phase opposition disposition (APOD) techniques. In addition to this, the comparison of the modulation methods is also analysed. Simulation is performed using MATLAB/Simulink. The POD and APOD carrier-based sinusoidal pulse width modulation techniques for three-phase seven-level diode clamped multilevel inverter are implemented on VPE Spartan 3A DSP board using Xilinx field programmable gate array (FPGA) and the experimental results are presented to validate the effectiveness of the operation of the seven-level diode clamped multilevel inverter using PWM strategies.

Evaluation of POD and APOD multicarrier SPWM techniques for three-phase seven-level diode clamped multilevel inverter fed induction motor drive using FPGA

Evaluation of POD and APOD multicarrier SPWM techniques for three-phase seven-level diode clamped multilevel inverter fed induction motor drive using FPGA

Extending the Linear Modulation Range to Full Base Speed Independent of Load Power Factor for a Multilevel Inverter Fed IM Drive

In this article, a method is proposed for the first time, to increase the linear modulation range till full base speed irrespective of load power factor for a multilevel inverter fed induction motor drive. A five-level inverter with a single dc source is used for the proposed scheme. Using this method, linear pulsewidth modulation (PWM) operation of the inverter can be achieved till peak phase fundamental voltage of 0.637 V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">dc</sub> without exceeding machine phase voltage rating. This method eliminates all the lower order harmonics from machine phase voltage till the full speed range of operation. The proposed five-level inverter scheme is realized by cascading a two-level inverter with a capacitor fed H-bridge, feeding open-end induction motor drive from one end and a capacitor fed two-level inverter from the other end. The proposed scheme uses space vector redundancy to balance all the capacitors during its operation. Operation of the proposed drive is analyzed extensively for normal five-level operation as well as during the extended modulation range. Experimental results for steady state and transient state operation are presented to validate the proposed scheme.

Comparison of Various Modulation Techniques for a Symmetrical Nine-Level Cascaded H-Bridge Multilevel Inverter Fed Induction Motor Drive

This paper discusses the comparison of different modulation techniques for a symmetrical 9-level cascaded H- bridge multilevel inverter fed induction motor drive. For all the modulation studies carried out flat topped sine wave is used as the reference wave which increases the fundamental voltage and reduces the switching losses. The comparative study of different modulation techniques like PD, POD, APOD and Phase shift for a 9-level inverter is done and based on the results obtained, POD PWM is chosen as the efficient technique with reduced THD output for the better performance of single phase induction motor load. The performance characteristics like speed and torque of the induction motor are also obtained.

Performance enhancement in a multilevel inverter fed PTC induction motor drive by optimal voltage vector selection

&lt;p&gt;This paper proposes a novel predictive control strategy for a multilevel inverter fed Induction Motor Drive (IMD) with optimal voltage vector selection at every sampling interval. The proposed predictive control strategy, apart from enhancing the dynamic speed and torque responses of the drive, strives to reduce the number of switching transitions by choosing optimal voltage vector, thereby reducing the switching losses significantly. The algorithm put forth here chooses the most suitable switching state among the redundant switching combinations, such that minimum number of switches change their states from the previous switching combination to the present one. This results in perceptible reduction in the switching losses thereby increasing the efficiency of the converter. The proposed Predictive Torque Control (PTC) strategy is modeled and simulated in Matlab/ Simulink environment and the results are reported for a 2-level and 3-level inverter fed IMD configurations. The results demonstrate the effectiveness of the proposed PTC for both 2-level and 3-level inverter fed IMDs.&lt;/p&gt;

Analysis and design of a novel hybrid topology for power quality improvement using multilevel inverter fed induction motor by reducing vibration for textile wastewater treatment applications

The proposed research involves the design and implementation of a novel hybrid topology for power quality improvement using multilevel inverter fed induction motor by reducing vibration for Textile applications. Various modern applications have started to require higher power gadgets as of late. Staggered inverter is equipped for giving wanted substituting voltage level at output utilizing different low-level DC voltage as an input. In H-connect staggered inverter, the quantity of output level is characterized by the quantity of exchanged capacitor cells. A small amount of voltage can be utilized to produce a supported output voltage by exchanging the capacitor in parallel and in series. Staggered inverter produces less Total Harmonic Distortion (THD), less electromagnetic interference and less voltage inrush on switches. The proposed topology delivers a staircase waveform with higher number of output level utilizing less segments contrasted with a few existing exchanged capacitor multilevel inverter. The task manages cascaded H-connect staggered inverter that can be utilized for both single and three stage change. The structure is created with H-bridge inverter including DC-DC converter. A sine pulse width twist is decided on PWM pulses. The inverter essentially takes care of the issue of capacitor voltage adjusting as every capacitor is charged to the esteem equivalent to one of the information voltages at each cycle. Recreation is finished with the assistance of MATLAB Simulink programming and the exploratory outcomes for current and voltage at various THD esteems are appeared and the equivalent is done for equipment. The prototype structure is conceded and analysed for various parameters of proposed method, which results in reduced switches and proves more efficient than other conventional methods and in addition it is more proficient for pumping process in textile industry for wastewater treatment.

Analysis of coupled and decoupled PWM techniques for induction motor drive

Dual inverter fed induction motor drive-in open-end winding gives more advantages than multilevel inverter fed induction motor drives. For better quality of output voltage with low common mode voltage (CMV), in this paper analysis of coupled and decoupled PWM techniques for open end winding induction motor are carried. The analysis is carried in MATLAB/simulink environment for vector controlled open end winding induction motor drive. The performance of drive and PWM techniques are evaluated both in transient, steady state and loaded conditions.

Analysis of coupled and decoupled PWM techniques for induction motor drive

Dual inverter fed induction motor drive-in open-end winding gives more advantages than multilevel inverter fed induction motor drives. For better quality of output voltage with low common mode voltage (CMV), in this paper analysis of coupled and decoupled PWM techniques for open end winding induction motor are carried. The analysis is carried in MATLAB/simulink environment for vector controlled open end winding induction motor drive. The performance of drive and PWM techniques are evaluated both in transient, steady state and loaded conditions.

Solar powered hybrid multilevel inverter fed induction motor using fuzzy proportional integral speed controller

In this paper, speed control of solar powered single phase hybrid multilevel inverter fed induction motor using fuzzy proportional integral controller is proposed. The proposed control system has been developed using MATLAB/SIMULINK. Performance of the proposed controller is tested in reference speed conditions with step change. The parameter analyzed for the proposed controller is steady-state error and settling time. This is compared with the proportional integral controller. Proposed speed controller is tested with two speed region such as low speed region and high speed region. In low speed region, speed command is varied from 40, 60, and 80 rad/s with 0.6 s step time. In high speed region, speed command is varied from 100, 120, and 140 rad/s with 0.6 s step time. Corresponding, performance parameters are measured and analyzed for both regions with proposed controller and proportional integral controller. From the test results, fuzzy proportional integral speed controlled hybrid multilevel inverter fed induction motor outperforms than proportional integral controller. Finally, the results are verified experimentally.

Improving Of Performance Characteristics Of Induction Motor Using Inverter Topologies

This paper presents the simulation and implementation of multilevel inverter fed induction motor drive. The output harmonic content is reduced by using multilevel inverter. In symmetrical circuit, the voltage and power increase with the increase in the number of levels of inverter. The switching angle for the pulse is selected in such way to reduce the harmonic distortion. This drive system has advantages like reduced total harmonic distortion and higher torque. The model of the multilevel inverter system is developed with PWM strategy to control the induction motor. The rate of change of voltage with respect to time i.e. dv/dt is very high at these edges, of the order of 500–5000 V/μs.The two-level inverter topology has attracted attention in low power low voltage drive applications where as Three-Level inverter topology has attracted attention in high power High performances voltage drive applications. Single-phase VSI cover low-range power applications and three-phase VSI cover the medium- to high-power applications. The Main purpose of these three level inverter topologies is to provide a three-phase voltage source, where the amplitude, phase, and frequency of the voltages should always be controllable. Although most of the applications require sinusoidal voltage waveforms.

Level Shifted Discontinuous PWM Algorithms to Minimize Common Mode Voltage for Cascaded Multilevel Inverter Fed Induction Motor Drive

This paper presents combinations of level shifted pulse-width modulation algorithm with conventional discontinuous pulse-width modulation methods for cascaded multilevel inverters. In the proposed DPWM a zero sequence signal is injected in sinusoidal reference signal to generate various modulators with easier implementation. The analysis four various control strategies namely Common Carrier (CC), Inverted Carrier (IC), Phase Shifted (PS) and Inverted Phase Shift (IPS) for cascaded multilevel inverter fed induction motor drive has been illustrated. To validate the proposed work experimental tests has been carried out using dSPACE controller. Experimental study proves that using proposed algorithms reduction in common-mode voltage with fewer harmonics along with reduced switching loss for a cascaded multilevel inverter fed motor drive has been achieved.

Improvised predictive torque control strategy for an open end winding induction motor drive fed with four‐level inversion using normalised weighted sum model

Open end winding induction motor (OEWIM) drives are better alternate for multi-level inverter fed induction motor drives. OEWIM drives can be used in industries and electric vehicles but they entail ripple-free torque. Predictive torque control (PTC) strategy offers high dynamic performance and lesser ripple in torque, flux when compared with direct torque control. Classical PTC involves high switching frequencies and empirical methods to select weighting factors. The selection and tuning of weighting factors are cumbersome. In this article, a new normalised weighted sum model (WSM) based PTC of four-level inverter fed OEWIM is introduced to curtail torque, flux ripples, switching frequency and enhance the selection of weighting factors. The proposed algorithm uses multi-objective cost function and the optimisation of cost function is performed by using normalised WSM. The normalisation of individual cost function simplifies the selection of weighting factors to select optimal voltage vector. As a result, the proposed PTC offers all the features of classical PTC and overcomes the difficulties involved in classical PTC. Simulation and experimental studies are performed on dual inverter fed OEWIM with four-level inversion. The effectiveness of proposed algorithm is verified by comparing proposed PTC algorithm with classical PTC algorithm.

Improved Field-Oriented Control for PWM Multi-level inverter-Fed Induction Motor Drives

&lt;p class="Abstract"&gt;&lt;em&gt;&lt;span lang="EN-US"&gt;T&lt;/span&gt;&lt;/em&gt;&lt;span lang="EN-US"&gt;his paper proposes a new approach to ensure the torque decoupled to the rotor flux of an induction machine based on the Field Oriented Control (FOC). The suggested method consists of inserting into the conventional d-q synchronous current controller, coupling terms of motor and multi-level inverter models. Making, the dynamic response of stator current components decoupled as well as the rotor flux and torque. In this paper, the mathematic model of an induction motor and multi-level inverter are first derived. Then, the synchronous current controller and modulation strategy for high power inverters are investigated. Finally, the validation through implementation and simulation of a 4.16 kV electric drive with MATLAB/Simulink and SimPowerSystems is performed. The model simulated in this paper includes an induction motor, nine-level cascaded H-bridge inverter and a carrier based space vector pulse-width-modulation.&lt;/span&gt;&lt;span lang="EN-US"&gt;The results of the simulations of each method has been recorded and the comparison results reveal that the proposed method effectively maintains the rotor flux decoupled to the torque.&lt;/span&gt;&lt;/p&gt;

Performance Analysis of FPGA based Diode Clamped Multilevel Inverter Fed Induction Motor Drive using Phase Opposition Disposition Multicarrier Based Modulation Strategy

&lt;p&gt;Multilevel inverters (MLI) are becoming more popular over the years for medium and high power applications because of its significant merits over two level inverters. This paper presents an implementation of multicarrier based sinusoidal pulse width modulation technique for three phase seven level diode clamped multilevel inverter. This topology is operated under phase opposition disposition pulse width modulation technique. The performance of three phase seven level diode clamped inverter is analyzed for induction motor (IM) load. Simulation is performed using MATLAB/SIMULINK. Experimental results are presented to validate the effectiveness of the operation of the diode clamped multilevel inverter using field programmable gate array.&lt;/p&gt;