SVPWM Technique Research Articles

DTC-SVPWM of an Energy Storage Flywheel Associated with a Wind Turbine Based on the DFIM

In this article we will control the energy storage inertial noted inertial energy storage system to partner with a wind energy conversion system that aims to improve the power quality transit network. Inertial storage is considered a flywheel coupled to an induction motor and controlled by a voltage inverter type power converter. First step, a model of inertial energy storage system (flywheel + asynchronous machine) is presented, then two control methods are proposed: the direct torque control (DTC and DTC-conventional SVPWM) (space vector pulse with modulation). The two control methods give similar performance, but the DTC-SVPWM requires less computation time. The two regulators and the proportional integrator SVPWM technique were used to determine the switching frequency. Using direct control with vector modulation strategy has enabled the inertial energy storage system of demonstrating good continuation even under rather severe operating conditions, and the torque ripples are significantly reduced compared to the case of conventional DTC. Then we come to the presentation of simulation results obtained.

Modeling, Analysis and Comparative of Down Sampling based Clamping SV PWM for Cascaded and Diode Clamped Multilevel Inverter fed Induction Motor Drive

This paper presents investigation and performance analysis of novel down sampling based clamping SV PWM technique for diode and cascaded Multi-level Invereter fed to Induction motor drive. A novel down sampling based clamping SVPWM has developed by adding triangular off set to sinusoidal fundamental waveform is modified by down sampling the reference wave by order of 10 so this technique is called clamping space vector pulse width modulation techniques such as PD, POD and APOD. so as to shift the lower order harmonics to higher order side. This novel carrier is compared with the offset injected space vector reference waveform to generate the required PWM pulses to the inverter. To analyze the performance of the proposed PWM technique it is implemented on seven level diode and cascaded Multi-level Inverter using Matlab/Simulink software tool for output line, phase voltage, currents, speed, torque and Total harmonic distortion analysis.

Investigation of TTMC-SVPWM Strategies for Diode Clamped and Cascaded H-bridge Multi-level Inverter Fed Induction Motor Drive

This paper presents a concept of two types multilevel inverters such as diode clamped and cascaded H-bridge for harmonic reduction on high power applications. Normally, multilevel inverters can be used to reduce the harmonic problems in electrical distribution systems. This paer focused on the performance and analysis of a three phase seven level inverter including diode clamped and cascaded H-bridge based on new tripizodal triangular space vector PWM technique approaches. TTMC based modified Space vector Pulse width modulation technique so called tripizodal triangular Space vector Pulse width modulation (TTMC-SVPWM) technique. In this paper the reference sine wave generated as in case of conventional off set injected SVPWM technique. It is observed that the TTMC-Space vector pulse width modulation ensures excellent, close to optimized pulse distribution results and THD is compared to seven level, diode clamped and cascaded multi level inverters. Theoretical investigations were confirmed by the digital simulations using MATLAB/SIMULINK software.

Investigation of TTMC-SVPWM Strategies for Diode Clamped and Cascaded H-bridge Multi-level Inverter Fed Induction Motor Drive

This paper presents a concept of two types multilevel inverters such as diode clamped and cascaded H-bridge for harmonic reduction on high power applications. Normally, multilevel inverters can be used to reduce the harmonic problems in electrical distribution systems. This paer focused on the performance and analysis of a three phase seven level inverter including diode clamped and cascaded H-bridge based on new tripizodal triangular space vector PWM technique approaches. TTMC based modified Space vector Pulse width modulation technique so called tripizodal triangular Space vector Pulse width modulation (TTMC-SVPWM) technique. In this paper the reference sine wave generated as in case of conventional off set injected SVPWM technique. It is observed that the TTMC-Space vector pulse width modulation ensures excellent, close to optimized pulse distribution results and THD is compared to seven level, diode clamped and cascaded multi level inverters. Theoretical investigations were confirmed by the digital simulations using MATLAB/SIMULINK software.

Performance Evaluation and Comparison of Two Cascaded Configurations of PV Generators-Five Levels Inverter for a Stand-Alone Application in South Algeria

In this paper two configurations of solar photovoltaic energy conversion using the NPC five levels inverter for stand-alone application in south Algeria are proposed and their performances compared. The first cascade uses four separate PV sources and the second configuration use only one PV generator. In these two cases and without DC/DC converter introduced between PV source and inverter and to get a stable AC voltage, authors in propose a proportional regulator of inverter modulation index. The SVPWM technique is used in order to get the best voltage waveform. For the second configuration proposed, we introduce in the control loops another algorithm which uses the redundant vectors of space vector diagram of inverter to stabilise the DC bus voltages. A real data of temperature and solar irradiation obtained by radiometric station in Ghardaïa city in south Algeria are used to test the performance of proposed controls. The simulation results show that the inverter output voltage is stable for the two configurations proposed despite the variation of solar irradiation, temperature and load. Also, the THD obtained is in the limits of international standards. Then, the PV cascade with separate PV sources is the best solution, seeing that we do not need to use another algorithm in the control loops.

DVR for Power Quality Improvement by using SVPWM technique

DVR for Power Quality Improvement by using SVPWM technique

Comparative study of two linearization methods for time intervals generation of SVPWM technique

According to the large number of variable voltage/variable frequency drive (VVVFD) systems, a continuous effort for developing new switching techniques to minimize the harmonics level and improve the power quality in such systems. The Space Vector Pulse Width Modulation SVPWM techniques, which are based on trigonometric functions, have dense calculations that require considerable processing time in system implementation.In this paper a comparative study for two linearization methods are carried out for generating the time intervals of SVPWM technique. The proposed linearization methods achieve a minimum computational time rather than the trigonometric sine function which is considered the base for the time interval calculations of the SVPWM technique. The first linearization method is based on the first order equation, and the second method is the (Takagi–Sugeno) fuzzy modeling system. The comparative study includes the accuracy of the two models, also a simulation model is carried out for current THD estimation using the two proposed methods compared with the current THD generated by SVPWM based on the trigonometric sine function.

Performance Comparison of SVPWM and ANN based SVPWM Technique for Power Quality Improvement

In this paper a modulator based on ANN for power quality improvement is presented. A low computational intensive ANN based SVPWM is designed for controlling a three-phase neutral clamped bidirectional three level rectifier. The performance of the system with SPWM and SVPWM technique is investigated and compared under different operating conditions through a developed simulation model in MATLAB/Simulink environment.

Analysis of PWM Techniques for Power Quality Improvement in PMSM Drives

Inverter fed adjustable speed drives are very much needed in today motion Industry. The switching of inverter plays a vital role in the operation of a drive. This paper presents a comparison of two different pulse width modulation techniques and its performance characteristics are analyzed for PMSM drives. The analysis is carried out for the different Modulation Index (MI). The SVPWM inverter allows to nourish the motor with a greater voltage and less harmonic distortions than the conventional sinusoidal PWM inverter. The SVPWM technique is better than previous switching methodologies and comparison of both SPWM and SVPWM using MATLAB is given with respect to its RMS voltage, THD and other power quality terms.

Discontinuous SVPWM Techniques of Three-Leg VSI-Fed Balanced Two-Phase Loads for Reduced Switching Losses and Current Ripple

In this paper, various types of discontinuous space vector pulse-width modulation techniques for a three-leg voltage source inverter supplying balanced two-phase loads are proposed. The main objectives of the paper are to analyze switching loss characteristics associated with semiconductor devices and to reduce output current ripple by dealing with various types of zero space vector time in each switching sequence. Capabilities of reductions in switching losses and current ripple for both balanced and unbalanced output phase voltages at high modulation index and load power factor angle of 30° lagging are focused. The validity of the proposed techniques is verified by simulation and experimental results in terms of voltage spectrum, current waveforms, reductions in switching losses, and output current ripple at high modulation index when compared to a continuous space vector pulse-width modulation technique.

Harmonic Reduction in Variable Frequency Drives Using Active Power Filter

In this paper Voltage Source Inverter (VSI) is used to supply a variable frequency variable voltage to a three phase induction motor drive in a variable speed application. One important complication is that, Voltage Source Inverter (VSI) used in VFD causes non-sinusoidal output voltage and current due to presence of harmonics. Shunt active filter with VSI topology is proposed for current harmonic elimination. The current control scheme proposed for SAPF is Synchronous Reference Frame theory applied to SVPWM. The reference current can be calculated by using Reference Frame Transformation, reference current are transformed from a−b−c stationary frame to d−q rotating frame. In SVPWM technique, the Active Power Filter reference voltage is generated and desired Active Power Filter output voltage is generated by SVPWM. The analysis of simulation results are carried out in MATLAB/SIMULINK model.

Theory and Modeling of a 150KW Doubly Fed Induction Machine with Bidirectional Multi-level Converters Control Using SVPWM Technique

This paper elucidates a direct approach to the theory and modeling of a standard 150KW doubly fed induction machine (DFIM) model for voltage and power stability analysis. It includes all models of major system components such as the DFIM model, the grid and the bidirectional multi-level power converter models using space vector pulse width modulation technique. All network models were implemented and simulated using the αβ transformation realized in MATLAB 7.5. The simulation results obtained from the proposed research work for the power converter and grid path of the network were duly presented for clarity. A comparative analysis of the simulation results of the DFIM with and without a protective crowbar is also presented as a contribution for further analysis of the machine understudy.

Modeling and Simulation of Improved Vector Control System for PMSM

In the AC control system, vector control theory is very popular as it makes the AC motor achieve the performance as perfect as DC motor [1]. In the paper, the vector control theory is briefly introduced, and then a vector control system model is builded in the matlab/simulink, and the SVPWM technique is adopted. The results show that the improved vector control sytem of PMSM has a excellent performance.

A Modeling and Simulation Method for SVPWM

The SVPWM technique plays an important role in the DC-AC transform. The modeling and simulation for SVPWM were proposed in this paper. The sector calculating model and basic vector working time model were set up. The effective vector function of time was set up. The triangle wave symmetry modulation was established too. The simulation results show that the model proposed in this paper is effective and has application value.

Microcontroller Based Efficient Multilevel Inverter Using SVPWM Technique

This paper presents the implementation of microcontroller based multilevel inverter using SVPWM technique. The output harmonic content is reduced by using multilevel inverter. The voltage and power increase with increase in the number of levels of inverter. The switching angle for the pulse is selected in such way to reduce the harmonic distortion. The model of the multilevel inverter system is developed with space vector modulation (SVM) strategy to run the induction motor. Space vector modulation technique is used to reduce the harmonics. Space vector modulation is required due to vector selection in d-q stationary reference frame.SVPWM technique proposed here can also work in over modulation range. The simulation work for space vector modulation and sinusoidal pulse width modulation (SPWM) are done and the results are compared. The THD content is reduced in case of SVM technique. In hardware, microcontroller based multilevel inverter is implemented. The hardware is implemented for a two level inverter. The multilevel inverter output has reduced harmonic level. A microcontroller based gating circuit generates the pulses required by the inverter. The multilevel inverter hardware is successfully fabricated and tested.

Frequency, Voltage and Angle Tracking for Photovoltaic Grid-Connected Inverter based on SVPWM Technique

Frequency, Voltage and Angle Tracking for Photovoltaic Grid-Connected Inverter based on SVPWM Technique

A Comparison of Carrier-Based and Space Vector PWM Techniques for Three-Level Five-Phase Voltage Source Inverters

Multilevel inverter supplied multiphase variable-speed drive systems have in recent times started attracting more attention, due to various advantages that they offer when compared to the standard three-phase two-level drives. For proper functioning of such systems good pulsewidth modulation (PWM) strategy is of crucial importance. Control complexity of multiphase multilevel inverters increases rapidly with an increase in the number of phases and the number of levels. This paper deals with a three-level neutral point clamped (NPC) inverter supplied five-phase induction motor drive and analyses five PWM strategies: three are carrier-based (CBPWM) and two are space vector based (SVPWM). The aim is to provide a detailed comparison and thus conclude on pros and cons of each solution, providing a guideline for the selection of the most appropriate PWM technique. Experimental results are provided for all analysed PWM methods. The comparison of the PWM techniques is given in terms of the voltage and current waveforms and spectra, as well as the total harmonic distortion (THD) in a whole linear modulation index range, which is used as the global figure of merit. Properties of the common mode voltage (CMV) are also investigated. Complexity of the algorithms, in terms of the computational time requirements and memory consumption, is addressed as well. It is shown that the performance of the PWM techniques is very similar and that one CBPWM and one SVPWM technique are characterised with identical performance. However, using the algorithm complexity as the main criterion, space vector techniques are more involved.

Performance Investigation of Multi-phase VSI with Simple PWM Switching Techniques

This paper presents the performance of multi-phase voltage source inverter (VSI) with simple PWM switching techniques, namely the harmonic injection and offset injection method. The technique discussed in this paper is easy to implement and avoid complicated controlling algorithm adapted in SVPWM technique. The generalized switching techniques are proposed in this paper. A generalized algorithm suitable for odd number of phases is developed in Matlab/Simuli nk environment and discussed in detail for both the switching methods. The performance of the 5, 7 and 9-phase VSI is studied with the above-said switching methods. The results of the simulation are presented for different modulation indices and a comparison in terms of fundamental voltage and THD identifies the better scheme suitable for multi-phase inverter fed drives.

FPGA Implementation of SVPWM Technique for Seven-Phase VSI

This paper presents the performance investigation of FPGA implementation of SVPWM technique for seven-phase voltage source inverter (VSI). Seven-phase voltage source inverters are dominantly used to supply the seven-phase drives which are used for high power applications. In the SVPWM technique a large space vectors are detailed. A voltage source inverter with the proposed SVPWM is simulated in Matlab/Simulink. The performance of the 7-phase VSI is analyzed in terms of fundamental voltage and THD. In the proposed work, SVPWM algorithm is described in high-speed integrated circuit hardware description language coding and implemented in an XILINX Spartan 3A FPGA processor. The selection of zero and active space vector sequence are discussed and the possibilities of realization on FPGA are analyzed.

A Novel Power Control Scheme of Zero Headed Power Generation by SVPWM Technique

A Novel Power Control Scheme of Zero Headed Power Generation by SVPWM Technique