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Comparative Analysis of Pulse Width Modulation Schemes Comparative Analysis of Pulse Width Modulation Schemes Новинка

Comparative Analysis of Pulse Width Modulation Schemes

4839 руб.
Space vector pulse width modulation (SVPWM) is an optimum pulse width modulation technique for an inverter used in a variable frequency drive applications. It is computationally rigorous and hence limits the inverter switching frequency. This book discusses a time equivalent SVPWM and neural Network based SVPWM technique for a five-phase voltage source inverter in under modulation region. A neural network has the advantage of very fast implementation of an SVPWM algorithm that can increase the inverter switching frequency. The scheme has been simulated and comparative study is given with the existing PWM schemes. The simulation results are given to validate the concept of proposed schemes.
Development Of Svpwm Controller For Three Level Inverter Development Of Svpwm Controller For Three Level Inverter Новинка

Development Of Svpwm Controller For Three Level Inverter

4839 руб.
Voltage Source Inverters(VSI) are widely used in Variable frequency drives, power conditioning equipment, Flexible AC transmission systems(FACTS), custom power devices and uninterruptible power supplies(UPS). The conventional two-level inverter synthesize voltage waveforms with high harmonics current, high dv/dt stress on connected equipment. To improve output wave form quality, the switching frequency has to be raised which causes additional switching losses. For high voltage induction motors, there are several approaches for realizing high voltage and high power inverters. Multi level voltage source pwm inverters are recently showing growing popularity because of easy sharing of large voltage between the series devices and lower THD in output voltage compared to two-level inverter.
Gesong Chen Variable Frequency Transformers for Large Scale Power Systems Interconnection. Theory and Applications Gesong Chen Variable Frequency Transformers for Large Scale Power Systems Interconnection. Theory and Applications Новинка

Gesong Chen Variable Frequency Transformers for Large Scale Power Systems Interconnection. Theory and Applications

9286.45 руб.
This book is an all-in-one resource on the development and application of variable frequency transformers to power systems and smart grids. It introduces the main technical issues of variable frequency transformers (VFT) systematically, including its basic construction, theory equations, and simulation models. Readers will then gain an in-depth discussion of its control system, operation performance, low frequency power oscillation, and technical economics, before proceeding to practical implementation and future developments. The related concepts of energy revolution, third generation grids, and power system interconnection are discussed as well. The first, comprehensive introduction to variable frequency transformers (VFT) An in-depth look at the construction of VFT, with simulations and applications Demonstrates how to assess the control system and overall system performance Analyses future developments, energy revolution and power system interconnections Variable Frequency Transformers for Large Scale Power Systems is a timely overview of the state of the art for VFT as it is increasingly adopted in smart grids. It is intended for engineers and researchers specializing in power system planning and operation, as well as advanced students and industry professionals of power engineering.
First Certificate Grammar Practice for the Revised Exam with Key First Certificate Grammar Practice for the Revised Exam with Key Новинка

First Certificate Grammar Practice for the Revised Exam with Key

199 руб.
Focus on First Certificate Grammar Practice provides extra practice in the main grammar and vocabulary areas covered in Focus on First Certificate. There are 12 units corresponding to the units of the course, with cross references to the Study Boxes and Focus on Grammar sections. Focus on First Certificate Grammar Practice can also be used as a free-standing workbook for students who wish to prepare for the Cambridge First Certificate examination. This new edition reflects the changes to the new edition of Focus on First Certificate and to the revised First Certificate in English examination. Focus on First Certificate Grammar Practice includes: study tips to help with common grammatical problems; four progress tests; exam-style exercises. Editions are available both with and without an answer key.
First Certificate Grammar Practice for the Revised Exam First Certificate Grammar Practice for the Revised Exam Новинка

First Certificate Grammar Practice for the Revised Exam

199 руб.
Focus on First Certificate Grammar Practice provides extra practice in the main grammar and vocabulary areas covered in Focus on First Certificate. There are 12 units corresponding to the units of the course, with cross references to the Study Boxes and Focus on Grammar sections. Focus on First Certificate Grammar Practice can also be used as a free-standing workbook for students who wish to prepare for the Cambridge First Certificate examination. This new edition reflects the changes to the new edition of Focus on First Certificate and to the revised First Certificate in English examination. Focus on First Certificate Grammar Practice includes: study tips to help with common grammatical problems; four progress tests; exam-style exercises.
Implementation of drive circuit for three phase inverter(Using VLSI) Implementation of drive circuit for three phase inverter(Using VLSI) Новинка

Implementation of drive circuit for three phase inverter(Using VLSI)

4839 руб.
The three phase inverter (using MOSFETs) is designed successfully.The PWM pulses are generated using VHDL.The Field Programmable Gate Array is used.The four modes 00 to 11 are used to change the frequencies, four different frequencies are used.The readmode index 0000 to 1010 are used to change the intensity or amplitude of the frequencies. Maximum intensity will be achieved at 1010 readmode index.This is the design of Three Phase Inverter and provide the flexibility to change the frequency as well as amplitude or intensity of the circuit.These PWM pulses are used to the inverter by using IGBT also.The three inverter is very important for Agriculture field. Because most of the Agriculture pumps are run on Three-Phases.If the battery sources run on renewable energy then the Three- phase inverter is very useful.As four different frequencies are generated then this system becomes universal system because Every country they have different Mains supply frequency.
Reduced Switch Z-Source Inverter Fed Induction Motor Drive Reduced Switch Z-Source Inverter Fed Induction Motor Drive Новинка

Reduced Switch Z-Source Inverter Fed Induction Motor Drive

5790 руб.
This work focuses on the performance analysis of a reduced switch three phase Z-source inverter fed cost effective induction motor drive system. In the proposed approach, instead of a conventional six switch three phase inverter a four switch three phase Z-source inverter is utilized. This reduces the cost of the inverter, the switching losses, and the complexity of the control algorithms. The new Z-source inverter system provides ride-through capability during voltage sags, reduces line harmonics, improves power factor, reliability and extends output voltage range. Validations of the theory and reduction methods are performed experimentally. This proposed method is able to reduce conduction noise in contrast with the existing conventional inverters. Analysis, simulation and experimental results are presented to demonstrate these new features.
Continuously Variable Rotorcraft Propulsion System Continuously Variable Rotorcraft Propulsion System Новинка

Continuously Variable Rotorcraft Propulsion System

4839 руб.
Explore the variable speed operation and shift response of a prototype of a continuously variable rotorcraft propulsion system and development of a Comprehensive Variable Speed Rotorcraft Propulsion system Modeling (CVSRPM) tool.Simulate the drive system dynamics in steady forward speed condition in an attempt to build upon previous variable speed rotorcraft propulsion studies by including, fully nonlinear first principles based transient gas-turbine engine model with shaft flexibility and incorporating a basic flight dynamics model to account for interactions with the flight control system. Explore the interactions between the various subsystems and obtain insight into the continuing development of variable speed rotorcraft propulsion systems and a study of various variable ratio transmissions that have already been explored.
Design & Analysis of five level inverter controlled with DVR Design & Analysis of five level inverter controlled with DVR Новинка

Design & Analysis of five level inverter controlled with DVR

3549 руб.
In this book an attempt has been to circuit modeling and simulation of dynamic voltage restorer (DVR) using cascaded five level inverter. However, under input disturbances noise is present in the response characteristics. Multilevel cascade inverter with separate dc sources has been proposed for sensitive load. Simulation results have shown that with control strategy that operate the switches at fundamental frequency. These inverters have low total harmonic distortion (THD) and high efficiency. The main advantages of using multilevel inverters for sensitive load is given as follows: It is suitable for high-voltage and high –current applications It has higher efficiency because the devices can be switched at a low frequency. NO EMI problem exists. No charge unbalance problem results when the converters are in either charge mode (rectification) or drive mode (inversion). This book is to improve the output voltage response in dynamics and steady state operation inverter. In this work leads to modeling and simulation of dynamic voltage restorer using cascade five level inverter to improve the voltage quality due to disturbances in supply system and to reduced hamonics.
Induction Motor Performance Improvement Induction Motor Performance Improvement Новинка

Induction Motor Performance Improvement

4839 руб.
In this book, Induction Motor (IM) efficiency and power factor improvement is proposed. Procedure of obtaining maximum efficiency point is demonstrated. When operating at slip of max. eff. the motor characteristics are compared with the motor conventional ones operating at rated voltage. It gives suitable operating voltage to drive motor at maximum efficiency for certain load torque. A general – purpose voltage – frequency pattern is investigated. Optimum efficiency operation at variable frequencies is presented with sample points. The required voltage relations at any frequency to drive the motor at optimum efficiency are deduced too. Load torque types operated at optimum efficiency are introduced also. Adaptive model of induction motor using neural networks is created. Two ANN sensorless units are displayed one for voltage reduction at motor max. eff. with base frequency; while second for voltage at any load torque value with frequency for motor optimum efficiency. Experimental part is illustrated to verify theoretical one with a complete test-bed and finally ANN Experimental model depending on experimental data is adopted to be used in speed estimation.
Cascaded Multilevel Inverter Based Transformerless Traction Drive Cascaded Multilevel Inverter Based Transformerless Traction Drive Новинка

Cascaded Multilevel Inverter Based Transformerless Traction Drive

4839 руб.
Electric railways have been introduced as a solution to the environmental problem caused by the diesel engines. Generally, in an electrified railway system, a transformer is used to step down the AC supply which can be used by the traction motors. This magnetically coupled transformer lead to high weight, several losses and reduced efficiency. This book presents the application of the cascaded multilevel inverter in the railway traction drive, thus leading to a transformer less traction drive. An IGBT based-cascaded multilevel inverter can be used to lower the supply voltage to a level convenient for the induction motors. This eliminates the need of a transformer in the railway traction drives and also results in the reduction in the Total Harmonic Distortion of the voltage to be supplied to the traction motors.
Electric Drives Principles Electric Drives Principles Новинка

Electric Drives Principles

6690 руб.
Modern electric drives are used extensively in industrial applications to perform a mechanical maneuver for a given load. In addition, they have other widespread applications, ranging from robots to automobiles to aircraft. Recent advances in the design of electric drives have resulted in low-cost, lightweight, reliable motors. Moreover, advances in power electronics have resulted in a level of performance that was not possible a few years ago. For example, induction and synchronous motors were never used in variable-speed applications until variable frequency and rapid switching were developed. In addition, owing to advances in power electronics, several designs of electric motors are now available.The essential goal of this book is to offer simple and concentrated scientific material about the principles of electric drives equipped with enough applied examples, and tutorial problems for those students and engineers who are interested with electric drive science.
ASPECTS OF INDUCTION MOTOR STATOR VOLTAGE AND FREQUENCY CONTROL ASPECTS OF INDUCTION MOTOR STATOR VOLTAGE AND FREQUENCY CONTROL Новинка

ASPECTS OF INDUCTION MOTOR STATOR VOLTAGE AND FREQUENCY CONTROL

5890 руб.
Direct implementation of Constant Flux Control of Induction Motor is difficult due to the lumped nature of winding parameters. Engineers have tried to solve this problem by using Volts/Hertz control which permits the indirect control of flux. To make full use of the motor torque capability at start and low speed, a modified Volt/Hertz control strategy which utilises low frequency boost-voltage is developed in this book. This, unlike the basic Volts/Hertz control, provides a boost-voltage at low frequencies thereby compensating for the stator impedance drops, offering constant flux operation and maximum motoring torque from zero to rated speed. This modified strategy is applied in the closed loop control of Induction Motor using Six Step Inverter. The results obtained show that variable voltage and frequency control allows simultaneous realization of good running and transient performances from squirrel cage induction motor which, inherently, is not capable of variable speed operation. All MATLAB/SIMULINK files used in realizing these results are included as appendix. The book is highly recommended for graduate level teaching and research in the area of Electric Machines and Drives
Fundamentals of Channel Estimation For Mobile Communications Fundamentals of Channel Estimation For Mobile Communications Новинка

Fundamentals of Channel Estimation For Mobile Communications

4839 руб.
Recently, mobile communications have developed rapidly due to the endless demand for broadband multimedia access and wireless connection anywhere, and any time. To harvest the advantages of these enabling technologies maximally, both tremendous opportunities, and major challenges are current in the research of signal processing specially for channel estimation (CE). CE algorithms allow the receiver to approximate the impulse response of the channel and explain the behavior of the channel. The focus of this work is to investigate and evaluate the different CE techniques in a single carrier frequency division multiple access (SC-FDMA) system. Here we analyze new variable step size (VSS)-least mean squares (LMS) and normalized VSS (NLMS)-normalized LMS (NLMS) blind CE algorithm that can automatically adapts the optimum weighting coefficients to the channel condition. This time-varying step size method is updated at each iteration to minimize the sum of the squares of the prior estimation errors up to that current time point. In addition, this CE algorithm uses phase discriminating weighting scheme such that algorithm is reduces error owing to noise as well as decision error.
Cambridge First Certificate: Practice Tests 2: For the First Certificate in English Examination (+ аудиокурс на 4 CD) Cambridge First Certificate: Practice Tests 2: For the First Certificate in English Examination (+ аудиокурс на 4 CD) Новинка

Cambridge First Certificate: Practice Tests 2: For the First Certificate in English Examination (+ аудиокурс на 4 CD)

939 руб.
Cambridge First Certificate Practice Tests 1 & 2 has been designed to familiarise students with the exact format of each part of the Cambridge First Certificate in English examination (FCE) as well as to expand their vocabulary and improve the skills required in the examination. Формат: 20,5 см х 27,5 см.
François Auger Signal Processing with Free Software. Practical Experiments François Auger Signal Processing with Free Software. Practical Experiments Новинка

François Auger Signal Processing with Free Software. Practical Experiments

4178.9 руб.
An ideal resource for students, industrial engineers, and researchers, Signal Processing with Free Software Practical Experiments presents practical experiments in signal processing using free software. The text introduces elementary signals through elementary waveform, signal storage files and elementary operations on signals and then presents the first tools to signal analysis such as temporal and frequency characteristics leading to Time-frequency analysis. Non-parametric spectral analysis is also discussed as well as signal processing through sampling, resampling, quantification, and analog and digital filtering. Table of Contents: 1. Generation of Elementary Signals. Generation of Elementary Waveform. – Elementary Operations on the Signals. – Format of Signal Storage Files. 2. First tools of Signal Analysis. Measurement of Temporal and Frequency Characteristics of a Signal. Time-Frequency Analysis of a Signal. 3. Non-parametric Spectral Analysis. 4. Signal Processing. Sampling. – Resampling. – Quantification. – “Analog” Filtering. Digital Filtering
Cambridge First Certificate Practice Tests 1: For the First Certificate in English Examination (+ аудиокурс на 4 CD) Cambridge First Certificate Practice Tests 1: For the First Certificate in English Examination (+ аудиокурс на 4 CD) Новинка

Cambridge First Certificate Practice Tests 1: For the First Certificate in English Examination (+ аудиокурс на 4 CD)

1059 руб.
Cambridge First Certificate Practice Tests 1 has been revised in line with the updated Cambridge First Certificate in English examination (FCE). The tests have been designed to familiarise students with the exact format of the new examination as well as to expand their vocabulary and to improve the skills required in the examination.
Complete First Certificate: Workbook with Answers (+ CD) Complete First Certificate: Workbook with Answers (+ CD) Новинка

Complete First Certificate: Workbook with Answers (+ CD)

729 руб.
COMPLETE FIRST CERTIFICATE is a brand new course for the revised First Certificate exam. It combines the very best in contemporary classroom practice with stimulating topics aimed at teenagers and young adults. The course covers every part of the First Certificate exam in detail providing preparation, practice, information and advice to ensure that students are fully prepared for every part of the exam. Informed by the Cambridge Learner Corpus and providing a complete First Certificate exam paper specially prepared by Cambridge ESOL, COMPLETE FIRST CERTIFICATE is the most authentic exam preparation course available. COMPLETE FIRST CERTIFICATE STUDENT'S BOOK WITH ANSWERS: - contains 16 topic-based units. Each unit covers one part of each First Certificate paper - is informed by the Cambridge Learner Corpus to help students tackle typical First Certificate problem areas - includes a complete model exam paper supplied by Cambridge ESOL - includes a CD-ROM for self-study - provides Writing and Speaking reference sections dedicated to the Writing and Speaking papers - contains a comprehensive Grammar reference section - contains an answer key and recording scripts. COMPLETE FIRST CERTIFICATE WORKBOOK WITH ANSWERS: - contains an answer key and recording scripts. - includes 16 topic-based units providing additional exam-style practice - includes a CD with workbook audio - includes answer key and recording scripts.
Complete First Certificate: Workbook with Answers (+ CD) Complete First Certificate: Workbook with Answers (+ CD) Новинка

Complete First Certificate: Workbook with Answers (+ CD)

1479 руб.
COMPLETE FIRST CERTIFICATE is a brand new course for the revised First Certificate exam. It combines the very best in contemporary classroom practice with stimulating topics aimed at teenagers and young adults. The course covers every part of the First Certificate exam in detail providing preparation, practice, information and advice to ensure that students are fully prepared for every part of the exam. Informed by the Cambridge Learner Corpus and providing a complete First Certificate exam paper specially prepared by Cambridge ESOL, COMPLETE FIRST CERTIFICATE is the most authentic exam preparation course available. COMPLETE FIRST CERTIFICATE STUDENT'S BOOK WITH ANSWERS: - contains 16 topic-based units. Each unit covers one part of each First Certificate paper - is informed by the Cambridge Learner Corpus to help students tackle typical First Certificate problem areas - includes a complete model exam paper supplied by Cambridge ESOL - includes a CD-ROM for self-study - provides Writing and Speaking reference sections dedicated to the Writing and Speaking papers - contains a comprehensive Grammar reference section - contains an answer key and recording scripts. COMPLETE FIRST CERTIFICATE WORKBOOK WITH ANSWERS: - contains an answer key and recording scripts. - includes 16 topic-based units providing additional exam-style practice - includes a CD with workbook audio - includes answer key and recording scripts.
Objective First Certificate: Student's Book Objective First Certificate: Student's Book Новинка

Objective First Certificate: Student's Book

439 руб.
Objective: First Certificate is a brand new exam preparation course from Cambridge University Press. This new course provides an introduction to the Cambridge First Certificate examination, whilst providing intermediate level students with the essential language and vocabulary training they need before starting an FCE-level preparation course.
Easier English Student Dictionary Easier English Student Dictionary Новинка

Easier English Student Dictionary

959 руб.
This edition offers over 32,000 terms used in international English. The selection is based on the frequency with which words occur in everyday language and analyses of the Certificate in Advanced English (CAE) exam syllabuses. Includes phonetic pronunciation, collocations, example sentences and information on social and cultural life.
First Certificate Writing: Teacher's Book First Certificate Writing: Teacher's Book Новинка

First Certificate Writing: Teacher's Book

449 руб.
First Certificate Writing helps students studying at upper intermediate level to develop their writing skills.Through a focused analysis of exam tasks, carefully staged activities and model texts. First Certificate Writing gives students all the guidance and practice they need to successfully answer any question in the Writing paper of the First Certificate exam. The First Certificate Writing Teacher's Book includes: An overview of the Writing paper of the First Certificate examination. A detailed description of the units in the Students' Book. An analysis of the writing skills required for Paper 2 of the FCE exam. A sample marked composition with a suggested correction code. An explanation of the marking criteria for FCE Paper 2. Lesson-by-lesson notes, with complete answer key, suggested answers and additional tips for the teacher. Формат: 21 см х 29,5 см.
Complete First Certificate: Class Audio CD Set (аудиокурс на CD) Complete First Certificate: Class Audio CD Set (аудиокурс на CD) Новинка

Complete First Certificate: Class Audio CD Set (аудиокурс на CD)

729 руб.
Complete First Certificate offers the most authentic preparation for the revised FCE exam available.
Adaptive Electricity Energy Saving Strategy for Industrial Motors Adaptive Electricity Energy Saving Strategy for Industrial Motors Новинка

Adaptive Electricity Energy Saving Strategy for Industrial Motors

4839 руб.
This book discusses investigation on induction motor energy saving strategy particularly applied in the small and medium scale industry. A walk-through motor energy audit is carried out in a typical type of industry in Indonesia to collect some important data. Three induction motor energy saving strategies, by which energy efficient motor, variable speed drive, and capacitor bank are considered with respect to five criteria thought to influence the decision making in selecting suitable energy saving strategy for motor. Besides, motor energy saving is assessed using technical approach considering annual energy saving obtained from energy efficient motor, variable speed drive, and capacitor bank. In addition, assessments are carried out to find energy efficiency indicator such as specific energy consumption and energy intensity, as well as assessment on carbon dioxide emission and mitigation.
THE VARIABLE BEHAVIOR OF /-R/ IN ANDALUSIAN SPANISH THE VARIABLE BEHAVIOR OF /-R/ IN ANDALUSIAN SPANISH Новинка

THE VARIABLE BEHAVIOR OF /-R/ IN ANDALUSIAN SPANISH

7256 руб.
This book investigates the linguistic and social factors influencing the variable pronunciation of /-r/ in the Spanish variety of Alcala de Guadaira (Seville) from the perspective of Bybee’s (2000, 2001, 2002) theory about lexical frequency. The results of this investigation indicate that both linguistic and social constraints are significant in deletion of /-r/, as it is favored by all the following phonetic contexts other than obstruents and vowels, infinitives, word-final position, and stressed syllables, as well as by the youngest generation, the lower education groups, and females. Word frequency was also found to be a significant factor: high-frequency items favor deletion of /-r/ and low-frequency words disfavor it. These findings show that /-r/ deletion in Andalusian Spanish is not random or categorical but that it can be accounted for by linguistic, social and lexical factors. This book will, therefore, be useful not only for scholars interested in phonological variation and/or in Andalusian varieties, but also for those who want to learn more about usage-based approaches to language variation and change.
Spurs in Fractional-N Frequency Synthesizers Spurs in Fractional-N Frequency Synthesizers Новинка

Spurs in Fractional-N Frequency Synthesizers

4839 руб.
The performance of a fractional-N frequency synthesizer is degraded due to the presence of unwanted spurious tones (spurs) in the output spectrum. The Digital Delta-Sigma Modulator can be directly responsible for the generation of spurs because of its inherent nonlinearity and periodicity. In this booklet we have predicted that specific nonlinearities in a fractional-N frequency synthesizer produce spurs at well-defined frequencies even if the output of the DDSM is spur free. Different spur free DDSM architectures have been investigated for the analysis of spurious tones in the output spectrum of fractional-N frequency synthesizers.
Фоторамка Image Art Certificate 6011-8 Фоторамка Image Art Certificate 6011-8 Новинка

Фоторамка Image Art Certificate 6011-8

846 руб.
Фоторамка Image Art Certificate 6011-8 это отличная фоторамка, которая прекрасно впишется в ваш интерьер. Классический дизайн совмещен с оригинальными деталями, что добавляет легкость и романтичность в домашнее окружение. Такая рамка может подойти и для офиса, ведь глазам так необходимо отдыхать от строгого офисного дизайна. Рамку можно повесить на стену, либо установить на плоской поверхности.
R.E.M. - Parallel R.E.M. - Parallel Новинка

R.E.M. - Parallel

1119 руб.
Tracklist: 01. Intro 02. Drive 03. Man on the moon 04. The sidewinder sleeps tonite 05. Everybody hurts 06. Nightswimming 07. Find the river 08. What's the frequency, Kenneth? 09. Bang and blame 10. Star 69 11. Strange currencies 12. Crush with eyeliner 13. Credits
Фоторамка Image Art Certificate 6010-8 Фоторамка Image Art Certificate 6010-8 Новинка

Фоторамка Image Art Certificate 6010-8

920 руб.
Фоторамка Image Art Certificate 6010-8 это отличная фоторамка, которая прекрасно впишется в ваш интерьер. Классический дизайн совмещен с оригинальными деталями, что добавляет легкость и романтичность в домашнее окружение. Такая рамка может подойти и для офиса, ведь глазам так необходимо отдыхать от строгого офисного дизайна. Рамку можно повесить на стену, либо установить на плоской поверхности.
Стиральная машина LG F-H0C3ND Стиральная машина LG F-H0C3ND Новинка

Стиральная машина LG F-H0C3ND

20920 руб.
LG F-H0C3ND Габариты: 85х60х44 см. Максимальная загрузка: 6 кг. Скорость отжима: 1000 об/мин. Класс стирки: A. Класс отжима: В. Класс энергопотребления: A. Система Прямого Привода Inverter Direct Drive™ Технология 6 движений заботы 6 Motion™ Мобильная диагностика SmartDiagnosis™.
Frequency Control For Wind Mill Applications Frequency Control For Wind Mill Applications Новинка

Frequency Control For Wind Mill Applications

3549 руб.
The wind power is a popular form of energy generation, the construction of wind farms and small wind electric generators are not universally welcomed because of the power quality issues due to which the converted energy could not be used more effectively. The frequency mismatch is one of the major crisis under the power quality issues when the renewable energy system is connected to the grid. Therefore the main objective of this project is to equalize the number of cycles per second in the grid as well as number of cycles per second in the inverter under different load conditions at various time periods. Hence the proposed project regarding frequency control scheme using grid integrated inverter for wind mill applications effectively compromises the drawbacks. Mainly the frequencies mismatch in the existing systems by equalizing the frequencies difference between the grid as well as the inverter.
Шина направляющая Bosch 1.4м FSN 140 (2.602.317.031) Шина направляющая Bosch 1.4м FSN 140 (2.602.317.031) Новинка

Шина направляющая Bosch 1.4м FSN 140 (2.602.317.031)

7100 руб.
Направляющая шина Fsn 140 Bosch 2602317031 Предназначена для электроинструмента Особенности: Парная струбцина отсутствует Выполнена из высококачественного материала Совместима с Gks 18 V; Gks 24 V; Gks 55; Gks 55 Ce; Gks 65; Gks 65 Ce; Gks 66 Ce; Gks 68 B; Gks 68 Bc; Gks 85; Gmf 1400 Ce; Gof 900 Ce; Gof 1300 Ce; Gof 1600 Ce; Gof 2000 Ce; Guf 4-22 A Professional; Pks 40; Pks 54; Pks 54 Ce; Pks 66; Pks 66 Ce; Pof 1200 Ae; Pof 1400 Ace Длина шины, см 140
Speed Control of Switched Reluctance Motor Speed Control of Switched Reluctance Motor Новинка

Speed Control of Switched Reluctance Motor

4839 руб.
The Switched Reluctance Machine (SRM)is the least expensive electrical machine to produce, yet one of the most reliable. As such, research has blossomed during the last decade, and the SRM and variable drive systems using SRMs are receiving considerable attention from industry. However, successful realization of an SRM variable drive system demands an understanding of the converter and controller subsystems and their integration with the machine. Switched Reluctance Motor Drives provides that understanding a unified view of the machine and its drive system from all of its system and subsystem aspects. With a careful balance of theory and implementation, the author develops the analysis and design of SRMs from first principles, introduces a wide variety of power converters available for driving the SRM, and systematically presents both low and high-performance controllers.The book includes an in depth study of Power converters and controllers SRM drives enables readers to learn all aspects of SRM drive systems and apreciate the interdependence of the various subsystems in performance optimization.
An Augmented Phase-Leg Configuration with Shoot-through Immunity An Augmented Phase-Leg Configuration with Shoot-through Immunity Новинка

An Augmented Phase-Leg Configuration with Shoot-through Immunity

9716 руб.
This book presents a new inverter phase-leg configuration that is inherently immune to shoot- through failures, eliminating one of the most serious failure modes in the conventional phase-leg configuration. The augmented phase-leg configuration (APLC) requires a single command signal and a simplified gate drive configuration to control the phase leg operation. The APLC also provides a significant advantage of eliminating the need for introducing dead-time intervals in the control of standard inverter phase legs. Very low levels of both harmonic distortion and nonlinearity are demonstrated using this new phase-leg configuration, making it attractive for many motor drive applications including low-frequency sensorless vector control, flux estimation, and open- loop voltage control. An alternative APLC topology is presented using a synchronous rectifier MOSFET that offers reduced losses by decreasing the forward conduction drop of the series diode. The results of this book provide valuable techniques and tools for developing new integrated power electronic modules that are highly integrated, intelligent, and robust.
Online Optimal Pulsewidth Modulation (OPWM) Online Optimal Pulsewidth Modulation (OPWM) Новинка

Online Optimal Pulsewidth Modulation (OPWM)

4839 руб.
Online Optimal Pulsewidth Modulation (OPWM) for a Multilevel Inverter explains a control scheme in controlling a 5-level Cascaded H-bridge Multilevel Inverter (CHMI) output voltage based on the OPWM switching strategies. For better CHMI output voltage magnitude control resolution, a curve fitting technique (CFT) for online computation of the OPWM switching angles is presented. Focus is given on the CFT and the multilevel control design aspect of the control scheme for the CHMI. This control scheme is generally suitable for AC power supply applications that do not involve variations in the multilevel inverter operating frequency. In addition, its suitability is also identified for applications that require high quality output voltage but at the same time do not allow increase in the multilevel inverter power devices switching frequency. This may be due to the technological limits of the power devices employed for high voltage applications or certain environmental condition. To show the feasibility of the control scheme, results of a simulation study and experimental work on a 5-level CHMI operation are presented.
Педаль эффектов BOSS CE-2W Педаль эффектов BOSS CE-2W Новинка

Педаль эффектов BOSS CE-2W

17490 руб.
Процессор хоруса для гитаристов в виде напольной педали, серия Waza Craft, совмещает в себе схемотехнику оригинальных CE-1 и CE-2. Две ручки регулировки, переключатель выбора одного из трех режимов: CE-2, CE-1 chorus и CE-1 vibrato. Два выхода для создания стереоэффекта.
Отбойный молоток Bosch GSH 5 CE Professional Отбойный молоток Bosch GSH 5 CE Professional Новинка
Vertical axis wind turbines Vertical axis wind turbines Новинка

Vertical axis wind turbines

7790 руб.
Vertical axis wind turbines or VAWTs have some advantages compared to the better known horizontal axis turbines or HAWTs. VAWTs based on the Darrieus rotor principle are more efficient and economical than the Savonius type, but fixed pitch Darrieus VAWTs lack starting torque. This can be overcome with variable pitch blades, but active pitch control is complex and impracticable for stand-alone, non-electrical applications. Passive or self-acting variable pitch allows blades to pitch under the combined action of aerodynamic and inertial forces such that that a favourable blade angle of attack is maintained without the complexity of conventional variable pitch systems. This work assesses the potential of both fixed pitch and passive variable pitch vertical axis wind turbines to provide economical stand-alone power for direct mechanical drive applications. It is shown that the starting torque and low speed torque problems of VAWTs can be overcome either by passive variable pitch or by a combination of suitable blade aerofoil sections, either rigid or flexible, and transmissions which unload the rotor at low speeds so that high starting torque is not necessary.
Мультиварка Moulinex CE 500E32 Мультиварка Moulinex CE 500E32 Новинка
Мультиварка Moulinex CE 503132 Мультиварка Moulinex CE 503132 Новинка
Cambridge KET For Schools Practice Tests: Teacher's Book Cambridge KET For Schools Practice Tests: Teacher's Book Новинка

Cambridge KET For Schools Practice Tests: Teacher's Book

579 руб.
Cambridge Key Certificate for Schools Practice Tests been prepared in line with the Cambridge Key Certificate in English for Schools examination.
Rising Star: A Pre-First Certificate Course: Teacher's Book Rising Star: A Pre-First Certificate Course: Teacher's Book Новинка

Rising Star: A Pre-First Certificate Course: Teacher's Book

2306 руб.
Rising Star – современный двухуровневый курс английского языка, обеспечивающий подготовку учащихся к сдаче ЕГЭ по английскому языку и международного экзамена First Certificate in English (FCE).
Skills for First Certificate: Listening and Speaking Skills for First Certificate: Listening and Speaking Новинка

Skills for First Certificate: Listening and Speaking

2079 руб.
The Longman Exams Skills series is for students preparing for the First Certificate exam. The book in each set provide through preparation for each of the papers with lots of practice based on real exam tasks.
Laser FCE: Teacher's Book Laser FCE: Teacher's Book Новинка

Laser FCE: Teacher's Book

1666 руб.
A modern, fun and exciting First Certificate course specifically designed for young students. Laser FCE offers thorough and systematic exam preparation together with solid grammar and vocabulary development to help give students the skills they need when taking the First Certificate exam.
First Certificate Passkey: Student's Book First Certificate Passkey: Student's Book Новинка

First Certificate Passkey: Student's Book

3539 руб.
Part of a course for the revised Cambridge First Certificate English examination. The course aims to provide a combination of motivating material and systematic development of language and exam skills, and consists of 12 topic-based units.
Simon Haines, Barbara Stewart First Certificate Masterclass: Teacher's book Simon Haines, Barbara Stewart First Certificate Masterclass: Teacher's book Новинка

Simon Haines, Barbara Stewart First Certificate Masterclass: Teacher's book

244 руб.
This course prepares upper-intermediate students thoroughly for the First Certificate English exam. The material is pitched at the level of the exam, supported by systematic revision pages, reference material at the back of the Student's Book, and tests in the Teacher's Book.
Think First Certificate: Practice Exams Think First Certificate: Practice Exams Новинка

Think First Certificate: Practice Exams

187 руб.
This course is designed to prepare students for the revised First Certificate exam using worked examples, increased listening and reading tasks, and a grammar section new to this edition.

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COMPLETE FIRST CERTIFICATE is a brand new course for the revised First Certificate exam. It combines the very best in contemporary classroom practice with stimulating topics aimed at teenagers and young adults. The course covers every part of the First Certificate exam in detail providing preparation, practice, information and advice to ensure that students are fully prepared for every part of the exam. Informed by the Cambridge Learner Corpus and providing a complete First Certificate exam paper specially prepared by Cambridge ESOL, COMPLETE FIRST CERTIFICATE is the most authentic exam preparation course available. COMPLETE FIRST CERTIFICATE STUDENT'S BOOK WITH ANSWERS: - contains 16 topic-based units. Each unit covers one part of each First Certificate paper - is informed by the Cambridge Learner Corpus to help students tackle typical First Certificate problem areas - includes a complete model exam paper supplied by Cambridge ESOL - includes a CD-ROM for self-study - provides Writing and Speaking reference sections dedicated to the Writing and Speaking papers - contains a comprehensive Grammar reference section - contains an answer key and recording scripts. COMPLETE FIRST CERTIFICATE WORKBOOK WITH ANSWERS: - contains an answer key and recording scripts. - includes 16 topic-based units providing additional exam-style practice - includes a CD with workbook audio - includes answer key and recording scripts.
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