AC-DC Rectifiers, Harmonics and Related Standards

A 3 month course through which detailed knowledge on AC-DC Rectifiers will be provided with the help of MATLAB and LTspice

  • Domain : ELECTRICAL
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A Quick Overview

A Rectifier is a power electronic device that converts a bi-directional AC into uni-directional DC. The applications of this device are vast, which includes popular electronic devices that we use daily like mobile phones, laptops, TVs, radios, audio amplifiers, charging circuits etc. A classic example of an AC-DC Rectifier is the home inverters which we rely on when the power goes off. AC-DC Converters (Rectifiers) are the back-bone of any power electronic systems. With the evolution of power electronics, the importance of AC-DC converters has increased significantly. Therefore, it is essential for an electrical/electronics engineer to understand the field of AC-DC converters thoroughly. 

The topics that will be covered in this course AC-DC Rectifiers, Harmonics and Related Standards using MATLAB and LTspice include 

  • Single-Phase & Three-Phase Uncontrolled AC-DC Converters, 
  • Semi Controlled Rectifiers, 
  • Phase Controlled AC-DC Converters (Single-Phase & Three-Phase),
  • Thyristor Based Circuits, 
  • Modes of Operation, 
  • Concepts of Power Quality, 
  • Passive & Active Compensation, 
  • Active Filtering, 
  • Study & Analysis of PWM Rectifiers, 
  • AC-DC Converters in Real-world & Industrial Applications, 
  • Harmonic Compensation and the Study of IEEE/IEC Standards. 

Through this course, students will gain detailed theoretical knowledge and design insights of AC/DC converters. With this knowledge, students will be able to design, simulate and analyze AC-DC Converters. The details of rectifier circuits covered in this course will be helpful to tackle the challenges that exist today in the power electronics industries.

During the coursework, students will be working extensively on simulation circuits using softwares like MATLAB and LTspice. Students will also be working on 2 projects in which they will be able to put their theoretical knowledge for practical use. 

Students pursuing their bachelors degree in engineering and Phd scholars who wish to pursue their research in this domain, can study this course. Only prerequisite is to have a basic understanding about electronic circuits.


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COURSE SYLLABUS

1Overview of Power Electronic Devices

  • Importance of AC-DC converter in any power electronic  converter application
  • Advantages of AC-DC converters
  • Applications of AC-DC converters in residential and industrial  applications
  • Introduction to device characteristics of Diode
  • Thyristor, MOSFET and IGBT (Only relevant details to this course will be covered)
  • Introduction to state of the art wide-bandgap devices  (SiC and GaN)
  • Criterion of device selection.

2Introduction to Simulation tools And Classification of AC-DC converters

  • Introduction to simulation platforms of MATLAB and LTspice
  • Basic details of simulating any general circuit in MATLAB and LTspice
  • Device installation in LTspice
  • Usefulness of these software tools for different scenarios
  • Detailed classification of AC-DC converters
  • Examples of these converters with their circuit diagrams (Half wave, full wave,  boost rectifier, PWM rectifiers, etc.)
  • Applications of these circuits for different scenarios

3Uncontrolled AC-DC converters: Diode based circuits and Simulations (Single phase)

  • HWR operation with R, RL, RLE and RC loads
  • Simulations and analysis 
  • FWR operation with R, RL and RC loads
  • Effect of source inductance and process of commutation
  • Simulations and analysis 
  • Power computations (instantaneous, average, energy and power  difference, digital computations with examples)
  • Power quality  parameter computations and study of harmonic issues (average, peak and rms values, ripple factor, form factor,  harmonic distortion, THD, etc)

4Three-phase uncontrolled AC-DC converters

  • HWR operation with R loads and analysing the effect of transformer on operation
  • Simulations and analysis 
  • Operation of Full-bridge three-phase rectifier and effect of  transformer on its operation
  • A case study with large capacitive filter 

5Phase controlled AC-DC converters: Thyristor based circuits and Simulations (Single phase)

  • Need of thyristor-controlled rectifiers
  • Design guidelines for usage of thyristor for rectifiers
  • Operation of Thyristor based HWR with R, RL and RLE load
  • Typical design issue in RL load case and its solution
  • Simulations and analysis 
  • FWR with R, RL load (with a case study using simulation) 
  • Effect of source inductance 
  • Different configurations of semi controlled rectifier circuits
  • Operation of these circuits for R and RL load scenarios with simulations.

6Phase controlled AC-DC converters: Thyristor based circuits and Simulations (Three phase)

  • Operation of three-phase fully controlled rectifier
  • Simple  technique to analyze these rectifiers
  • Cases study for various values of firing angle and load cases
  • Effect of transformer on its operation
  • Simulation and analysis. 

7Inverter mode operation of AC-DC converters and notion of power quality in rectifiers

  • Case study of full bridge rectifier operating in inverter mode
  • Applications of these converter mode
  • Dual converter case  study
  • Simulation and analysis 
  • Power quality in rectifier circuits
  • Active and reactive powers
  • Understanding power factor
  • Basics of power factor correction  

8Harmonics and Input power factor correction in rectifiers: Passive and active compensation, Active filtering and PWM rectifiers

  • Introduction to methods to improve input power factor in  rectifiers
  • Classification of PFC rectifiers and examples
  • Concept of active filtering
  • Operating principle of PFC rectifier
  • Control of PFCs and different controlling methods
  • PWM rectifiers (regenerative, non-regenerative) 

9Design and analysis of PWM rectifier and Study of AC-DC converters in real-world applications

  • A case study for PWM rectifier
  • Closed loop operation
  • Designing of PWM rectifier
  • Simulation and analysis 
  • Industrial applications: Induction heating (resonant converters and integral cycle converters) 

10Study of AC-DC converters in real-world applications

  • Industrial applications: DC motor drive
  • A case study of DC motor drive
  • Speed control
  • Modes of operation and applications 
  • Utility applications: High voltage DC HVDC transmission system (Rectifier and inverter mode of operation, harmonic compensation and control) 

11Harmonic compensation and Study of IEEE/IEC standards

  • Principle of Harmonic compensation
  • Passive and Active harmonic compensation
  • Static VAR compensators: TCR, TSC, STATCOM etc.,
  • Comparison of different compensators 
  • Study of IEEE 518, 519, IEC 61000-4-7, etc.,
  • Understanding terminologies necessary for design. 

12Design methodology for Industrial AC-DC converter

  • System overview
  • Objectives of AC-DC converter
  • Design procedure
  • Name plate study of AC-DC converter
  • Challenges in  AC-DC converter design
  • State of the art converters
  • Research topics
  • Future applications
  • Overview of this course and conclusion 


Projects Overview

Project 1

Highlights

In this project, students will be asked to design and simulate the three-phase uncontrolled and controlled rectifier circuits for the given design parameters. They need to design the circuit in one of the simulation platforms (MATLAB  or Ltspice/Simetrix) and obtain the circuit waveforms. Based on their simulation studies, they will be asked to find the average dc voltage, peak to peak ripple, input current THD, DPF, PF and the average dc current of the circuits. 

Project 2

Highlights

In this project, students will be asked to design and simulate the closed loop single phase high-power factor rectifiers with the following objectives: 

  • Observation of source current THD and its reduction to IEEE recommended value. 
  • Compute and control the input power factor and displacement factor 
  • Regulation of load voltage with change in load current and dc voltage reference  
  • Demonstration of current and voltage control

WHO IS THIS COURSE FOR ?


  • One should be familiar with the basics of electronics.
  • The knowledge of basic power electronic switches can be beneficial but not necessarily required as it will be covered in brief.

SOFTWARE COVERED

MATLAB

MATLAB allows matrix manipulations, plotting of functions and data, implementation of algorithms, creation of user interfaces, and interfacing with programs written in other languages.  Simulink, adds graphical multi-domain simulation and model-based design for dynamic and embedded systems such as power electronics system. Power electronics simulation with Simulink® lets you model complex topologies with multiple switching devices using standard circuit components. You can run fast simulations with average models or ideal switching behavior, or use detailed nonlinear switching models for parasitics and detailed design.



LTspice

LTspice is a high performance SPICE simulation software, schematic capture and waveform viewer with enhancements and models for easing the simulation. It is a powerful, straightforward, and freeware SPICE simulation tool that is widely used in the industry. In this course this software will be utilized in parallel with the MATLAB, so that one should not be limited with the analytical capabilities of single software tool.


COURSE FEE

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Frequently Asked Questions

1Who can take your course?

The course is specifically designed for: 

  1. Engineering students doing bachelor and master degree who wish to expand their knowledge in AC-DC converters
  2. PhD scholars who wish to do their research in the field of AC-DC converter 
  3. Industrial persons and faculty members who would like to develop capabilities in AC-DC converter 
  4. Individuals seeking career in domains of power electronics and its applications
  5. Graduates who seek job in electrical domain 

In this course you will be learning popular AC-DC converter circuits, their analysis and associated issues. You will also learn the methods and tools to analyse any  industry level AC-DC converter circuits. The course will also cover relevant IEEE/IEC standards to prepare you for power electronic industry. The course will  include dedicated session for introduction to software tools such as MATLAB and LTspice which are widely used in industry and practical case studies to make you familiar with industry level analysis using these tools. This course will also discuss applications and design methodologies of rectifier circuits.  

The basic requirements to opt this course are as follows: One should be familiar with the basics of electronics. The knowledge of basic power electronic switches  can be beneficial but not necessarily required as it will be covered in brief.  

2What is included in your course?

In this course you will be learning popular AC-DC converter circuits, their analysis and associated issues. You will also learn the methods and tools to analyse any  industry level AC-DC converter circuits. The course will also cover relevant IEEE/IEC standards to prepare you for power electronic industry. The course will  include dedicated session for introduction to software tools such as MATLAB and LTspice which are widely used in industry and practical case studies to make you familiar with industry level analysis using these tools. This course will also discuss applications and design methodologies of rectifier circuits.  

3What will the student gain from your course?

AC-DC converters are the back-bone of any power electronic systems. With the evolution of power electronics, the importance of AC-DC converters is increased  significantly. Therefore, it is essential for an electrical engineer to understand the field of AC-DC converter thoroughly. In this course, students will get detailed  theoretical knowledge and design insights of AC/DC converters. With this knowledge, students will be able to design, simulate and analyze the AC-DC converters  (rectifiers). The details of rectifier circuits covered in this course will be helpful to tackle the challenges in power electronic industries.    

4What software skills are you teaching and how well are these tools used in the industry?

This course cover dedicated learning sessions on two relevant software tools viz MATLAB and LTspice. MATLAB is predominantly used in the industry for analysis  of power electronic circuits. While, Ltspice is an open source software tool, which is exactly similar to Pspice/Saber/Simetrix used in most of the industries. Thus,  students will be trained in multiple software tools. They will also be given mini projects involving designing and analysis of the circuits using these software tools in  order to develop proficiency in these software tools. Students can use this knowledge in any power electronic industry.  

5What is the real world application for the tools and techniques will you teach in this course?

The course content is designed to cover real world applications of AC-DC converter circuits. In this course, students will be learning AC-DC converter circuits used  every day in real life such as AC-DC converters in DC motor drives, harmonic compensation circuits (STATCOM, etc), chargers in mobile/laptop, DC power  transmission etc. The analytical methods and software tools taught in this course can be directly applied to the circuits in these applications. 

6Which companies use these techniques and for what?

As already mentioned, AC-DC converter is a back-bone of power electronic system. Therefore, most of the power electronic industries deals with these converters.  The major players in this area are ABB, Siemens, CG, General Electric, Semikron, Alstom, Hitachi etc. These companies use AC-DC converters as the front-end converter for various products like industrial motor drives, EV charging stations, etc. The techniques taught in this course will be directly applied to design and  analyse these systems. 

7How is your course going to help me in my path to MS or PhD?

For future education, whether it be MS or PhD, the detailed knowledge of the field is very important. This course aims to not only train the students in this topic  but also will develop a analytical skills which are important for MS/PhD. It is an advanced course with industrial synergy and also includes content that are taught  in top notch Universities in the world. Therefore, with this course students will be able to use this knowledge in further research and education. 

8How is this course going to help me get a job?

Most of the industries expect a candidate with sound basics and profound knowledge of analytical tools. Additionally, the practical knowledge and problem-solving skills benefits the candidate. Since this course is prepared to cover all these points, students trained with this course will be preferred choice by any power  electronic industry. The analytical tools and problem-solving skills learned by students in this course will be applicable to real-world power electronic applications  and thus, chances of getting a job will be high. Since hands on training are given to the learners, they will get more confidence about this field so that they can face  the interview in an effective way when compared to other candidates. 


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  • Access Duration : 2 Months
  • Mode of Delivery : Online
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  • Access Duration : Lifetime
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  • Top 5% of the class will get a merit certificate
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