scholarly journals Modeling and Validation of the Switching Techniques Applied to Back-to-Back Power Converter Connected to a DFIG-Based Wind Turbine for Harmonic Analysis

Electronics ◽  
2021 ◽  
Vol 10 (23) ◽  
pp. 3046
Author(s):  
Emmanuel Hernández-Mayoral ◽  
Efraín Dueñas-Reyes ◽  
Reynaldo Iracheta-Cortez ◽  
Eduardo Campos-Mercado ◽  
Vicente Torres-García ◽  
...  
Keyword(s):  
Harmonic Distortion ◽  
Experimental Tests ◽  
Power Converter ◽  
Voltage Profile ◽  
Correct Operation ◽  
Electrical Grid ◽  
Induction Generators ◽  
Electrical Grids ◽  
Proposed Model ◽  
Three Phase

Most power quality problems for electrical grids connected to Doubly-Fed Induction Generators (DFIGs) include flicker, variations of the RMS voltage profile, and injected harmonics because of switching in power converters. These converters have different topologies with the back-to-back (B2B) topology being the most exploited in high-powered three-phase systems. Therefore, in this article a model of a DFIG connected to the B2B power converter is proposed to which different switching techniques are implemented for interharmonic propagation studies. The switching techniques that are implemented include the Sinusoidal PWM (SPWM), the third harmonic injection PWM (THIPWM), and the space vector PWM (SVPWM), to reduce the Total Harmonic Distortion (THD) index of voltage and current in both windings of the machine. MATLAB-Simulink® software is used for modeling and simulating the B2B power converter and the switching techniques. The proposed model is validated with an experimental prototype that includes a 3-kW DFIG, a 10 HP motor, a gear-box with a transmission ratio of 4.5: 1, a B2B power converter, and a three-phase transformer connecting the system to the electrical grid. Finally, it is shown that the results obtained from the experimental tests corroborate the correct operation of the proposed model.

scholarly journals The influence of iron losses on selecting the minimum excitation capacitance for self-excited induction generator (SEIG) with wind turbine

2020 ◽  
Vol 19 (1) ◽  
pp. 11
Author(s):  
Hayder Hussein Kadhum ◽  
Ahmed Samawi Alkhafaji ◽  
Hayder H.Emawi H. Emawi
Keyword(s):  
Iron Loss ◽  
Induction Generator ◽  
Matlab Simulation ◽  
Accurate Analysis ◽  
Induction Generators ◽  
Iron Losses ◽  
Proposed Model ◽  
Three Phase ◽  
Steady State Model ◽  
Selection Of

<p>The capacitance selection of the three-phase self-excited induction generators (SEIG) driven by wind energy is influences by the iron losses. This paper is dealing with this problem by constructing a steady state model of the generator supplying an induction oil pump. No previous literature studying the requirements of selecting the minimum excitation capacitance under the iron loss impact is found. This work is focusing on: (i) a novel evaluation of the characteristics of the induction generator taking iron loss into account. (ii) the errors caused by neglecting the iron loss. (iii) the importance of including the iron-loss in any accurate analysis. (iv) the errors occurred in the selection of the precise excitation capacitance (C<sub>exct</sub>) when the iron-loss neglected. Nodal analysis is suggested to describe the study-state performance of the proposed model. A Matlab/simulation is established to validate the proposed model.</p>

scholarly journals AC Current Ripple Harmonic Pollution in Three-Phase Four-Leg Active Front-End AC/DC Converter for On-Board EV Chargers

Electronics ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 116
Author(s):  
Aleksandr Viatkin ◽  
Riccardo Mandrioli ◽  
Manel Hammami ◽  
Mattia Ricco ◽  
Gabriele Grandi
Keyword(s):  
Smart Grids ◽  
Harmonic Distortion ◽  
Experimental Tests ◽  
Operating Conditions ◽  
Voltage Source ◽  
Switching Frequency ◽  
Voltage Source Converters ◽  
Three Phase ◽  
Ac Current ◽  
Current Ripple

Three-phase four-leg voltage-source converters have been considered for some recent projects in smart grids and in the automotive industry, projects such as on-board electric vehicles (EVs) chargers, thanks to their built-in ability to handle unbalanced AC currents through the 4th wire (neutral). Although conventional carrier-based modulations (CBMs) and space vector modulations (SVMs) have been commonly applied and extensively studied for three-phase four-leg voltage-source converters, very little has been reported concerning their pollution impact on AC grid in terms of switching ripple currents. This paper introduces a thorough analytical derivation of peak-to-peak and RMS values of the AC current ripple under balanced and unbalanced working conditions, in the case of three-phase four-leg converters with uncoupled AC-link inductors. The proposed mathematical approach covers both phase and neutral currents. All analytical findings have been applied to two industry recognized CBM methods, namely sinusoidal pulse-width modulation (PWM) and centered PWM (equivalent to SVM). The derived equations are effective, simple, and ready-to-use for accurate AC current ripple calculations. At the same time, the proposed equations and diagrams can be successfully adopted to design the conversion system basing on the grid codes in terms of current ripple (or total harmonic distortion (THD)/total demand distortion (TDD)) restrictions, enabling the sizing of AC-link inductors and the determination of the proper switching frequency for the given operating conditions. The analytical developments have been thoroughly verified by numerical simulations in MATLAB/Simulink and by extensive experimental tests.

Allocation and Sizing of Dispersed Photovoltaic Generation in Diesel Isolated Electrical Systems Using an Analytical Approach

2014 ◽  
Vol 136 (4) ◽  
Author(s):  
Claudio Goncalves ◽  
J. Paulo A. Vieira ◽  
Dione J. A. Vieira ◽  
M. Emilia L. Tostes ◽  
Bernard C. Bernardes ◽  
...  
Keyword(s):  
Active Power ◽  
Voltage Profile ◽  
Power Losses ◽  
Analytical Methodology ◽  
Photovoltaic Generation ◽  
Electrical Grid ◽  
Medium Voltage ◽  
Electrical Systems ◽  
Electrical Grids ◽  
Active Power Losses

This paper proposes an analytical methodology to allocate and size active power photovoltaic generation (PVG) units with embedded DC/AC inverter (PVGI) to be integrated as concentrated or dispersed generation in isolated medium voltage electrical grids. The methodology considers multiple objectives: improving the electrical grid voltage profile; reducing active power losses and the diesel generation participation. To validate the proposed methodology, the IEEE 33 and 69 buses networks and an isolated real electrical system were simulated. The results obtained demonstrated that the proposed methodology is effective in providing a solution with improvement in voltage profile, active power losses reduction, diesel generation participation reduction.

scholarly journals Modeling of three-limb three-phase transformer relates to shunt core using in industrial microwave generators with n=2 magnetron per phase

2019 ◽  
Vol 9 (6) ◽  
pp. 4556
Author(s):  
H. Outzguinrimt ◽  
M. Chraygane ◽  
M. Lahame ◽  
R. Oumghar ◽  
R. Batit ◽  
...  
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
Analytical Method ◽  
Single Phase ◽  
Digital Simulation ◽  
Experimental Tests ◽  
High Voltage Power Supply ◽  
Proposed Model ◽  
Three Phase ◽  
Microwave Generators

<p>This paper describes the development and implementation of a digital simulation model of a three-phase transformer relates to shunt core transformer, which used to drive magnetron tubes in the microwave. The focus of this study is based on modeling of a new shell-type of three limbs three-phase transformer. The model uses to feed two magnetrons instead of one magnetron per phase. The proposed model is established on the simultaneous analysis of a duo electromagnetic lumped component equivalent circuit. This latter was implemented in a MATLAB environment under rated conditions. The results obtained from the application of the analytical method are provided results in conformity to the experimental tests in the case of single phase high voltage power supply for one magnetron.</p>

scholarly journals Algorithm for Implementation of Optimal Vector Combinations in Model Predictive Current Control of Six-Phase Induction Machines

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3857
Author(s):  
Carlos Romero ◽  
Larizza Delorme ◽  
Osvaldo Gonzalez ◽  
Magno Ayala ◽  
Jorge Rodas ◽  
...  
Keyword(s):  
Computational Cost ◽  
Harmonic Distortion ◽  
Experimental Tests ◽  
Sampling Period ◽  
Induction Machines ◽  
Current Control ◽  
New Techniques ◽  
Three Phase ◽  
Finite Control ◽  
Algorithm Implementation

The development of new control techniques for multiphase induction machines (IMs) has become a point of great interest to exploit the advantages of these machines compared to three-phase topology, for example, the reduced phase currents and lower harmonic contents. One of the most analyzed techniques is the model-based predictive current control (MPC) with a finite control set. This technique presents high x–y currents because of the application of one switching state throughout the whole sampling period. Nevertheless, it is one of the most used due to its excellent dynamic response. To overcome the aforementioned drawbacks, new techniques called virtual vectors have been developed, but although there are several articles with experimental results, the algorithm for implementing the technique has not been appropriately described. This document provides a clear and detailed explanation for algorithm implementation of virtual vectors through two proposed variants VV4 and VV11, in a six-phase machine drive. The first entails lower computational cost and the second lower loss in the x–y plane. According to performance indicators such as the total harmonic distortion and the mean square error for both case studies, experimental tests were evaluated to determine the implementation’s behaviour.

scholarly journals SIMULINK/MODELSIM CO-SIMULATION AND FPGA REALIZATION OF SPWM CONTROLLER FOR THREE PHASE MULTILEVEL INVERTER

2013 ◽  
pp. 254-259
Author(s):  
AMALA MINU C K ◽  
DARSANA VIJAY
Keyword(s):  
Harmonic Analysis ◽  
Output Voltage ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Voltage Source ◽  
Voltage Waveform ◽  
Simulink Model ◽  
Proposed Model ◽  
Three Phase ◽  
Different Levels

In this project a design of application-based adaptable level three-phase diode clamped multilevel voltage source inverter is proposed. The inverter is designed in a fussy manner, that different levels of the inverter can be designed and simulated in a single circuit. Using select input he level switching of inverter is done. A Mat lab/Simulink model of the proposed design is modeled and simulated, with the gating signals generated using FPGA. A Phase opposition disposition sinusoidal PWM (PODSPWM) algorithm is used for generation of gating signals. The harmonic analysis of the output voltage waveform for each levels of inverter is done separately and using proposed model, verified the result. A comparison of total harmonic distortion of different levels of inverter is done. The t o t a l harmonic distortion is very low for higher level inverter. The FPGA implementation of gating signals for the proposed model is done using Xilinx Spartan 3 XCS400PQ208.

scholarly journals Experimental Comparisons and Evaluations of Different Types of DC-link Capacitors for VSI-Based Electric Compressors in Battery Electric Vehicle Systems

Electronics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 1276
Author(s):  
Namhun Kim ◽  
Changju Park ◽  
Sangshin Kwak ◽  
Jeihoon Baek
Keyword(s):  
Electric Vehicle ◽  
Experimental Tests ◽  
Power Converter ◽  
Voltage Source ◽  
Battery Electric Vehicle ◽  
Voltage Source Inverters ◽  
Three Phase ◽  
Vehicle Systems ◽  
Interior Permanent Magnet ◽  
The Cost

Electric compressor systems for air conditioning operations are an essential part in battery electric vehicle systems, which are not applicable to conventional belt-driven compressors due to no combustion engines. Three-phase voltage source inverters (VSI) and interior permanent magnet (IPM) motors are generally used for electric compressor systems in battery electric vehicles. Direct current (DC)-link capacitors are a critical component in the power converter systems, which affect the cost, size, performances and scale. Metallized polypropylene film capacitors are considered more reliable than conventional electrolytic capacitors for high temperature environments such as electric vehicle applications. This paper presents comprehensive comparisons and evaluations of electric compressors with two types of DC-link capacitors. Based on a 5 kW IPM motor drives and a VSI with a nominal DC voltage of 360 V for electric compressors, performances with electrolytic and film capacitors have been evaluated by experimental tests.

scholarly journals Assessment of energy quality impacts for reactive power compensation with capacitor banks and D-STATCOM

2019 ◽  
Vol 16 (2) ◽  
pp. 232-241
Author(s):  
Santiago Benavides Córdoba ◽  
José R. Ortiz Castrillón ◽  
Yesika A. Gutiérrez Villa ◽  
Nicolás Muñoz Galeano ◽  
Juan B. Cano Quintero ◽  
...  
Keyword(s):  
Reactive Power ◽  
Harmonic Distortion ◽  
Experimental Tests ◽  
Industrial Applications ◽  
Electrical Grid ◽  
Electrolytic Capacitors ◽  
Capacitor Banks ◽  
Test Conditions ◽  
Resistive Loads ◽  
Static Compensator

This paper presents an assessment of capacitor banks and Distribution Static Compensator (D-STATCOM) with respect to their impact on energy quality. Tests were done with capacitor banks built with electrolytic capacitors commonly used in industrial applications and a D-STATCOM. Experimental tests were performed for power factor correction in order to reduce the reactive power demanded from the electrical grid for inductive-resistive loads. For comparative purposes, the control of the D-STATCOM was set to operate with similar compensation conditions to that of the capacitor banks. Results show that under the same test conditions capacitor banks produce higher Total Harmonic Distortion (THD) than D-STATCOM.

scholarly journals Performance Analysis of Z-Source Fed Cascaded Multilevel Inverter

2019 ◽  
Vol 8 (11) ◽  
pp. 2648-2653
Keyword(s):  
Electromagnetic Interference ◽  
Electrical Power ◽  
Harmonic Distortion ◽  
Pwm Control ◽  
Voltage Profile ◽  
Electrical Power System ◽  
Multilevel Inverters ◽  
Three Phase ◽  
Cascaded Multilevel Inverter ◽  
Multicarrier Pwm

Three phase multilevel inverters are frequently utilized in moderate and high power industries by minimizing the electromagnetic interference (EMI), enhancing the voltage profile and improving the power capacity. Although various converter topologies are developed for multilevel inverters (MLIs), Z-source MLIs are widely used for higher voltage applications. Z-source MLIs diminishes the total harmonic distortion (THD), and it has good stability and efficacy for various electrical power system applications. This paper aims to develop a three phase Z-source seven-level cascaded H-bridge (CHB) inverter with multicarrier PWM control techniques. The Z-source CHB inverter with multicarrier PWM control is modeled and its performance investigation with shoot through and non-shoot through modes is carried out in MATLAB/Simulink software platform.

Resonant BLDC Motor Drive System for Medical Applications

2019 ◽  
Vol 14 ◽  
Author(s):  
C. Vidhya ◽  
V. Ravikumar ◽  
S. Muralidha
Keyword(s):  
High Frequency ◽  
Pulse Width Modulation ◽  
Power Converter ◽  
Low Power Consumption ◽  
Motor Drive ◽  
Medical Applications ◽  
Bldc Motor ◽  
Three Phase ◽  
High Frequency Ac ◽  
Motor Drive System

: The objective of this paper is to implement an ac link universal power converter controlled BLDC motor for medical applications. The ac link universal power converter is a soft switched high frequency ac link converter, created using the parallel combination of an inductor and a capacitor. The parallel ac link converter handle the ac voltages and currents with low reactive ratings at the link and offers improved power factor, low power consumption, more efficiency and less weight on comparison with the traditional dc link converter. Because of the high throughput, BLDC motors are preferred widely medical applications. A modulation technique called Space Vector Pulse Width Modulation (SVPWM) is used to generate the three phase power for the BLDC motors from the input DC supply. To validate the proposed system, simulations are performed in MATLAB – Simulink and an experimental prototype is constructed to supplement the simulation results.

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