Digital Control of Power Electronics Training Course

Introduction to the

Digital Control of Power

Electronics -4 Day

Training Workshop Get the Digital Power Control

Advantage

601 E DAILY DRIVE, STE 112

CAMARILLO CA 93010

PHONE +1 805 764 2027

E-MAIL: [email protected], WEB: ELMGDIGITALPOWER.COM

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www.ElmgDigitalPower.com 2011-2016 by Hamish Laird. All Rights Reserved. Published by ELMG Ltd.

For more information, please contact:

ELMG Ltd ELMG Digital Power INC

601 E Daily Drive, Ste 112

Camarillo CA 93010

Phone +1 805 764 2027

Skype: hamishlaird-elmg

[email protected]

Web: www.elmgdigitalpower.com

mailto:[email protected]

skype:echo123?call



CAMARILLO CA 93010

PHONE +1 805 764 2027


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Table of Contents I. www.ElmgDigitalPower.com ....................................................................... 1

Table of Contents

Learning Outcomes – After attending the course

you will be able to:

II. Course Outline ................................................................................................ 4

Day 1 Morning – Digital Control of Power

Electronics

Day 1 Afternoon – Converter transfer

measurement lab

Day 2 Morning – Digital Modulators

Day 2 Afternoon – Digital Modulators Precision and

Spectral Control lab

Day 3 Morning – Digital Control and Power

Day 3 Afternoon – Implementation – measuring

the converter and designing the controller lab

Day 4 Morning – Getting digital control robust,

rugged and maintainable

Day 4 Afternoon – Putting it all together lab

III. What other people have said about the

course .............................................................................................................. 8

IV. About the presenter Dr. Hamish Laird ...................................................... 11



CAMARILLO CA 93010

PHONE +1 805 764 2027


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Who should attend?

Practicing Power Electronics Engineers

Experienced engineers moving into digital control of power electronics.

Recent graduates who have some experience (<5 years) and need to up skill in what is

important in digital control.

Software engineers writing software in digital power control teams.

Firmware engineers doing FPGA development in digital power control teams.

Mid-career engineers who are transitioning from analogue control to digital control.

Learning Outcomes – After attending the course you will be able to:

Close a digital power converter feedback loop in a stable fashion by following repeatable easily

understood steps.

Understand what the effect digital control’s limited bandwidth, processing power, number of bits

and dynamic range have in digital power electronic control.

Understand the interaction of power electronics and digital control. This includes sampling and

aliasing in the context of fixed and variable frequency switching power converters.

Take away methods and steps to solve design issues such as one sample noise, precision limits in

filters and controllers, non-linearity, quantisation and other digital effects.



CAMARILLO CA 93010

PHONE +1 805 764 2027


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Course Outline The objectives of this course are to provide solutions to the key issues in digital signal processing

using microcontrollers, microprocessors, DSP and FPGA so these can be used effectively in the

control of power electronics.

Day 1 Morning – Digital Control of Power Electronics

The morning of day 1 presents a short introduction to control. The use of block diagrams, transfer

functions and frequency response is then covered.

The Control Block Diagram – digital differences.

What is important in digital control?

The short history of control

Control FAQs

Frequency responses

Domains and how and when to use them, s, z, modified z, and delta

Key control concepts from a digital point of view, bandwidth, precision, in band and

crossover.

Controllers you will meet, PI, P, LP,

Digital only controllers.

Loop Shaping control design

Truths about control

Day 1 Afternoon – Converter transfer measurement lab

Measuring converter transfers using analysers.

Measuring converter transfers using the digital controllers



CAMARILLO CA 93010

PHONE +1 805 764 2027


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Day 2 Morning – Digital Modulators Digital modulators and why they are so important

Digital PWM characteristics

What we want from digital PWM

Effective numbers of bits

Variable Period Oscillators VPO as modulators

Increasing the effective number of bits

Spectral control of digital modulators

How to “fix” your modulator

Day 2 Afternoon – Digital Modulators Precision and Spectral Control lab

Modulator performance

Modulator improvement

Spectral effects and accuracy improvement



CAMARILLO CA 93010

PHONE +1 805 764 2027


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Day 3 Morning – Digital Control and Power Power converters and their typical characteristics are covered. The usefulness of modelling and

measuring to get transfer functions is covered. Structures of digital controllers are then

presented and used to design a digital controller

The power converter

Modelling of converters

Measuring of converters

Designing with control in mind

Digital controllers

The Unit circle and Pole Zero Plots, useful pole zero combinations.

Implementing these pole zero combinations on your MCU/DSP

Where digital control of power electronics is different from analogue control

Where digital control of power electronics is the same as analogue control

Practising closing the digital power electronic control loop. Worked examples.

Summary, recap and questions.

The building blocks of digital control

Analogue to digital converters, precision, speed, number of bits, linearity

Software, Firmware

Filters for the control block

Other useful domains – modified z and delta transforms

Control blocks integrators, filters, lead and lag

Anti-aliasing filters and aliasing

The use and usefulness of three phase converters

Signal processing for three phase systems

Summary, recap and questions

Day 3 Afternoon – Implementation – measuring the converter and designing the controller lab

Converter measurements

Compensator design and implementation

Loop closing

Performance



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PHONE +1 805 764 2027


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Day 4 Morning – Getting digital control robust, rugged and maintainable

The robust, rugged and maintainable digital controller.

Ensuring that the digital controller design is going to work

Quantisation – assessing the effect and if there is a problem

Precision – fixing any low precision effects

Integrators – why these are usually problematic

Fixing digital integrator problems.

Single sample noise

Aliasing and how to analyse it

Production variation and margins

Converter non linearity

You and your software engineer

Verification of software

Validation of software.


Day 4 Afternoon – Putting it all together lab .

Starting at the very beginning with power converter design

Designing the power converter for control

Choosing the microprocessor

Assessing the processing power you need before buying the processor.

The effect of delay – dealing with delay

Converter non linearity

Number of bits you actually need

Extending the number of bits

Digital Modulators – linearizing for the converter where possible.

Compensator

Analogue to digital converter

Anti-aliasing filter design




CAMARILLO CA 93010

PHONE +1 805 764 2027


8

What other people have said about the

course After the course we ask people what they think. Here are summaries of the responses.



CAMARILLO CA 93010

PHONE +1 805 764 2027


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Talk to someone who has attended the course?

E-mail [email protected] and we will get you talking.

"Had very high expectations of this course. Hamish delivered. Excellent for power

engineers who are starting digital power. Thanks for putting this on...I only regret it

is a 3 day course. I could sit here for 3 more days"

"This course was full of critical material not found in the app notes. Very enjoyable

and well taught."

"Good course. Hamish knows his material. I'll be able to apply this coursework to

my work."

“I would highly recommend the ELMG digital control course to all power

electronics engineers. What makes this course particularly valuable is in the

practical approach and relevance to the control of power electronics. The topic

of digital control is a very broad subject and hence the specific challenges and

applicable tools are very different depending on the application details.

Many digital control / DSP courses try to approach the topic from a very generic

broad approach, treating all applications in the same way. The classic approach

involves starting from a conventional analog control model and then adding ADC

and DAC blocks to change between the analog and digital domains with a

digital controller replacing the traditional analog controller.

The problem with this classic approach is that it is not a practical or applicable

method for designing high bandwidth controllers for use for the control of power

converters.

The ELMG digital control course specifically focuses on the control of power

electronics and hence the course only considers concepts and techniques that

are applicable to the control of power electronics. The course covers a wide




CAMARILLO CA 93010

PHONE +1 805 764 2027


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range of digital control theory and introduces the power electronics engineer to

all of the state of the art digital control concepts. This course is a must for any

power electronics engineer who is involved in the digital control of power

converters.”

Michael Harrison.

Senior Director

Power Conversion Strategy

Enphase Energy

Petaluma CA 94954 USA

What you get at the course

Four days of unique targeted training on digital power electronics control that covers the

detail of both digital control and power electronics and how they go together.

Copy of the slide presentation course booklet covering the material presented.

Lunch – please advise any special dietary needs when you book.

The ability to close a digital power converter feedback loop in a stable fashion by

following repeatable easily understood steps.

Techniques to understand what the effect digital control’s limited bandwidth, processing

power, number of bits and dynamic range have in digital power electronic control.

Knowledge of the interaction of power electronics and digital control. This includes

sampling and aliasing in the context of fixed and variable frequency switching power

converters.

Take away methods and steps to solve design issues such as one sample noise, precision

limits in filters and controllers, non-linearity, quantization and other digital effects.



CAMARILLO CA 93010

PHONE +1 805 764 2027


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About the presenter Dr. Hamish Laird

Dr. Hamish Laird is a Principal Engineer at ELMG Digital Power,

Christchurch, New Zealand.

ELMG Digital Power was formed in 2001 by people who have collectively been involved

worldwide with digital control of power electronics since 1992.

Hamish is also an adjunct Senior Researcher at the University of Canterbury Dept. of

Electrical and Computer Engineering, Christchurch, New Zealand where he has taught

power electronics and is involved in power electronics research.

Hamish Laird is a member of the IEEE.

Hamish Laird studied for the Bachelor of Electrical and Electronic Engineering at the

University of Canterbury, Christchurch, New Zealand from 1987 to 1990. Immediately

following this he completed a Master's at the same University. The area of research was

in active filtering with the Thesis title “A resonant link shunt active filter for the power

system”.

From 1992 to 1994 he worked as a design engineer developing induction motor starters

and variable speed drives at AuCom Electronics, Christchurch, New Zealand.

After traveling, living in the USA, Hamish worked at GEC Alsthom (now Alstom)

Transmission and Distribution Power Electronics Systems, Stafford, England, UK in 1995

and 1996.

Here Hamish worked performing analysis of HVDC transmission systems and SVC

reactive power control systems including the design for series connection of SCRs. In

1996 Hamish joined Eurotherm Drives (now Parker Hannifin SSD Drives), Littlehampton,

England where he worked in product development of DC and AC motor drives.



CAMARILLO CA 93010

PHONE +1 805 764 2027


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In 1998 Hamish commenced study for the PhD degree in the Department of Electrical

and Electronic Engineering, University of Canterbury, Christchurch, New Zealand. The

title of the thesis completed in 2001 was “Modelling and measurement of non-linear

rectifier loads and their interaction with shunt active filters”. Hamish is the author of 17

academic papers on digital power electronics and power quality.

Hamish works in developing digitally controlled power converters and controllers for

converters. Hamish is a well-regarded teacher, engineer, researcher and public

speaker.


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Digital Control of Power Electronics Training Course

Education