Chapter 1_ Power Electronics for Renewable Energy Sources - Alternative Energy in Power Electronics
POWER ELECTRONICS FOR RENEWABLE ENERGY ...POWER ELECTRONICS FOR RENEWABLE ENERGY SYSTEMS UNIT I...
Transcript of POWER ELECTRONICS FOR RENEWABLE ENERGY ...POWER ELECTRONICS FOR RENEWABLE ENERGY SYSTEMS UNIT I...
UNIT I INTRODUCTION Environmental aspects of electric energy conversion: impacts of renewable energy generation on environment (cost-GHG Emission) - Qualitative study of different renewable energy resources: Solar, wind, ocean, Biomass, Fuel cell, Hydrogen energy systems and hybrid renewable energy systems.
UNIT II ELECTRICAL MACHINES FOR RENEWABLE ENERGY CONVERSION Reference theory fundamentals-principle of operation and analysis: IG, PMSG, SCIG and DFIG.
UNIT III POWER CONVERTERS Solar: Block diagram of solar photo voltaic system -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
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 Need for Hybrid Systems- Range and type of Hybrid systems- Case studies of Wind-PV Maximum Power Point Tracking (MPPT)
UNIT II
ELECTRICAL MACHINES FOR RENEWABLE ENERGY CONVERSION
Reference theory fundamentals-principle of operation and analysis: IG, PMSG, SCIG and DFIG.
GENERATORS USED FOR WIND ENERGY CONVERSION SYSTEM● IG –power factor poor● SEIG- power factor improved● SCIG –constant speed WECS● DFIG(WRIG)- variable speed generator● PMSG –Permanent Magnet Synchronous Generator
Induction Generators● Same basic construction as squirrel-cage induction motors● Drive at a speed greater than the synchronous speed● Not started as a motor● Operated by wind turbines, steam turbines, etc.
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PMSGAdvantages over the DFIG● The PMSG does not require DC excitation as the
magnetic field is produced by the permanent magnets rather than by the coil.
● Hence, the PMSG does not require slip rings and brushes, which reduces the weight, cost, losses, and maintenance
● PMSG, connected to the power electronic converter, can operate at low speeds; hence, a gearbox is not required
Classification of PMSGBased on the direction of the flux lines:● Radial flux PMSGs● Axial flux PMSGs and ● Transverse flux PMSGsBased on the location of the permanent magnets on the
rotor: ● Surface inset PMSGs● Surface mounted PMSGs and ● Interior PMSGs
Clarke’s Transformation● It transforms abc quantity into stationary and● coincides with phase a-axis and leads the by ● The equation with
The inverse
Park’s Transformation● It was proposed by Robert H. Park from MIT● There are wide ranges of application from machine
simulation, control, drives, etc. ● This transform is one of the most important application for
power engineers.
Park’s Transformation (3)● A vector in space can be seen from several coordinate
● We can change from one coordinate to another coordinate