Wind Energy
How wind energy works ?
It involves using wind turbines to convert the kinetic energy of moving air to electrical energy.
what are the types of generators in WECS?
1.Squirrel cage induction generator (SCIG) - Asynchronous
2.Doubly fed induction generator (DFIG) - Asynchronous
What are the principle used in double fed induction generator
Electromagnetic Induction,Slip Ring Technology,Back-Back convertor system,Two-Axis Reference FrameModel,Bidirectional Power Flow
SCIG operates on which principle
Faraday's law of Electromagnetic induction
What are the types of PMSG
Radial Flux PMSG
Axial Flux PMSG
Transverse Flux PMSG
What is mean by anemometer?
To find the direction & speed of the wind.
Define the term slip and formula
Slip is the term used to describe difference between rotor speed and rotating air gap magnetic field speed (synchronous speed). Slip = Synchronous speed-Rotor speed
What is the speed range of the DFIG wind energy system
Around ±30%
Slip range of SCIG
-1% to -5% (Operates slightly above synchronous speed)
What is radial Flux
A radial flux generator is a type of electrical generator where the magnetic flux flows perpendicular to the axis of rotation
What are the types of wind turbines?
Horizontal Axis Wind Turbines (HAWTs)
Vertical Axis Wind Turbines (VAWTs)
What are the electronic components needed wind energy interface?
Wind Generator
Converter
Inverter
For What purpose the Gearbox is used?
Gearbox: Adjusts the low-speed turbine rotation to match the required generator speed.
MW of the largest SCIG wind energy system
3.5MW in offshore wind farms
Application of PMSG
Electrical Vehicles
Wind Energy System
Marine Propulsion
What is tip speed ratio?
Tip Speed Ratio can be defined as the ratio of tip of the blade to the wind speed.
What type of generator is used—synchronous or asynchronous? With eg
Both synchronous generators and asynchronous -Squirrel Cage Induction Generators (SCIG) or Doubly Fed Induction Generators (DFIG).
Power Convertors in DFIG
Rotor-Side Converter (RSC) controls rotor speed and reactive power.
Grid-Side Converter (GSC) ensures smooth power transfer to the grid
SCIG require a DC field excitation voltage State True or false
False it dosent require DC field excitation voltage
Why PMSG has highest efficiency
Due to no rotor losses
What is the equation of wind turbine ?
Pwind = ((1/2)×ρair)×(πR^2)×(Vwind^3)
or
Pwind=1/2PAv^3
What is Grid Side Converter?
It is an AC-DC converter circuit which is used to provide a regulated DC voltage to the inverter.It is used maintain a constant DC link voltage
How does the rotor-side converter regulate active and reactive power independently? answer please
The rotor-side converter regulates active power by controlling the in-phase rotor current and reactive power by managing the quadrature rotor current, using decoupled vector control techniques. This enables independent and precise power management.
Describe the use of capacitor bank in SCIG
A capacitor bank is used to balance power since SCIG cannot control reactive power
What is the RPM of synchoronus generator(PMSG) when the number individual poles is 24 at 50HZ
250