renewable energy system

1. POWER ELECTRONICS FOR
RENEWABLE ENERGY SYSTEMS
(U19EEE73)
Department of Electrical and Electronics
Engineering

2. Course Objectives
• To discover the importance of renewable energy on
power generation.
• To learn the various operating modes of solar and wind
energy systems.
• To understand the different power converters for
renewable energy systems.
• To gain knowledge on stand-alone and grid connected
renewable energy systems.
• To acquire importance of hybrid renewable systems and
maximum power point tracking algorithms.

3. Course Outcomes
After completion of the course, the students will be able to
CO1 - Design and analyze the electrical generators for
renewable energy conversion.(K2)
CO2 - Interpret the applications of power electronics in
wind and solar energy systems. (K2)
CO3 - Design different power converters for renewable
energy systems. (K2)
CO4 -Analyze standalone and grid connected operating
modes of wind, solar energy systems. (K2)
CO5 - Implement maximum power point tracking
algorithm and gain knowledge on hybrid systems. (K2)

4. Syllabus
UNIT I ELECTRICAL MACHINES FOR RENEWABLE ENERGY CONVERSION (9 Hrs)
Environmental aspects of electric energy conversion – impacts of renewable energy
generation on environment – qualitative study of different renewable energy resources
– Modeling and analysis of Doubly Fed Induction Generator – Permanent Magnet
Synchronous Generator – Squirrel Cage Induction Generator.
UNIT II SOLAR ENERGY AND WIND ENERGY (9 Hrs)
Solar and Wind potential in India - Solar energy: solar thermal conversion devices and
storage – solar cells – characteristics and photovoltaic conversion – estimation of
solar radiation – PV systems – analysis of PV systems – applications of PV Systems-
Harmonic standards-Harmonic problems- MPPT
Wind Energy: nature of wind – Power in wind-site selection consideration – basic
components of wind energy conversion system – types of wind machines – control
techniques – applications of wind energy – inter connected systems - Harmonics and
power factor improvement.

5. Syllabus
UNIT III POWER CONVERTERS (9 Hrs)
Principle of operation: line commutated converters (inversion-mode) - Boost
and buck-boost converters- selection of inverter, battery sizing, array sizing.
Wind: Three phase AC voltage controllers- AC-DC-AC converters:
uncontrolled rectifiers, PWM Inverters, Grid Interactive Inverters-matrix
converters
UNIT IV ANALYSIS OF WIND AND PV SYSTEMS (9 Hrs)
Stand-alone operation of fixed and variable speed wind energy conversion
systems and solar system- Grid connection Issues -Grid integrated PMSG, SCIG
Based WECS, grid Integrated solar system
UNIT V HYBRID RENEWABLE ENERGY SYSTEMS (9 Hrs)
Need for Hybrid Systems- Range and type of Hybrid systems- Case studies of
Wind-PV Maximum Power Point Tracking

6. Syllabus
Text Books
S. N. Bhadra, D.Kastha, S.Banerjee, “Wind Electrical Systems”, Oxford
University Press, 1st Edition, 2005.
B. H. Khan, “Non-conventional Energy sources”, Tata McGraw-hill
Publishing Company, 3rd Edition, 2017.
K. Venkataratnam, “Special Electrical Machines”, Universities Press,
1st Edition, 2008.
Reference Books
M. H. Rashid, “Power Electronics Hand book”, Academic press, 4th
Edition, 2017.
Ion Boldea, “Variable speed generators”, Taylor and Francis group,
2nd Edition, 2015.
Remus Teodorescu, Marco Liserre, Pedro Rodriguez, “Grid Converters
for Photovoltaic and Wind Power Systems”, John Wiley and Sons,
Ltd., 1st Edition, 2011.
Gray, L. Johnson, “Wind energy system”, Prentice hall linc, Electronic
Edition, 2006.
Andrzej M. Trzynnadlowski, “Introduction to Modern Power
Electronics”, Wiley, India Pvt. Ltd, 2nd Edition, 2012.

7. INTRODUCTION
 Energy is an important input for development.
 It aims to the natural resources, energy
resources are also renewable as well as non
renewable.
 Renewable energy resources : Energy sources
that are easily replaced after being consumed.
 Non-renewable energy resources : Energy
sources that are not replaced or replenished
after being used. (May take several years to
replace). 3

8. Sources of energy
Conventional sources Non-conventional sources
● Solar energy
● Wind energy
Commercial
● Coal
●Oil & natural
gas
●Thermal power
Non-commercial
● Firewood
(Fuel wood)
●Hydro power
●Nuclear power
● Tidal energy
● Geothermal
energy
● Biomass -
based energy
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Environmental aspects of electric energy conservation
• Quality of the environment (main constituent air , soil, water)
is degrading
• To create public awareness June 5th is observed as World
Environment Day.
• During every energy conversion process pollutants are
produced as a by-product.
• The various pollutants and its harmful effects is an
important environmental aspects of electric energy
conservation.
• Particulate matter (complex mixture of extremely small
particles and liquid droplets), CO2,CO,SOX,NOX are the
various pollutants.
• Their harmful effects are change in climatic condition, global
warming , depriving oxygen and increase in cardiovascular
diseases, corrosion of architectural buildings etc

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GHG Emission
• Gases that trap heat in the atmosphere are called greenhouse gases
(GHG) .
• The greenhouse is an enclosure having transparent glass pane trapping
the heat in the atmosphere.
• Similarly the CO2 is an enclosure present around the globe which
prevents the heat from the earth to escape. This cause the global
warming.
•This effect of GHG such as
• methane,
• CO2,
• nitrous oxide,
• Sulphur hexafluoride,
• water vapour,
• hydroflurocarbon is lead to global warming.
•The CO2 leads to 82% of total GHG emission.
The main factors which influence the GHG emission is –
(i) Large scale fossil fuel combustion of power plant all over the world.
(ii) Felling of trees- deforestation –industrialization
(iii) Pollution due to vehicles and byproducts of industries.

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GHG Emission
(i) Carbon dioxide enters the atmosphere through burning fossil fuels (coal,
natural gas, and oil), solid waste, trees and wood products, and also as a
result of certain chemical reactions (e.g., manufacture of cement).
(ii) Particulate matter lead to reduced sunlight and low visibility-
respiratory problems
(iii) SO2,SO3 due to combustion of fuel from motor vehicles, power plant,
waste disposal
(iv) Methane is emitted during the production and transport of coal,
natural gas, and oil.
(v) Nitrous oxide is emitted during agricultural and industrial activities, as
well as during combustion of fossil fuels and solid waste.
(vi) Fluorinated gases: Hydrofluorocarbons, perfluorocarbons, sulfur
hexafluoride, and nitrogen trifluoride are synthetic, powerful greenhouse
gases that are emitted from a variety of industrial processes.

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Modeling and Analysis of DFIG
DFIG system with converters, turbine and grid.

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Fig 2.2: Power Flow in DFIG

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