Recommend with justification the generators used in SWT.

1 Answer

Answer :

1. Fixed Speed Induction Generator: This is squirrel cage induction generator for fixed speed. This is 1) reliable 2) self-starting 3) easy to adjust 4) have low maintenance. 

2. Permanent Magnet Synchronous Generator: This is synchronous generator for variable speed. This is 1) eliminate field copper loss 2) high power density 3) low rotor inertia 4) high efficiency 5) optimizes use of given grid capacities 6) Better cooling performance 7) Reduced noise level of moving parts.

Related questions

Description : Prepare preventive maintenance schedule for SWT related to i) Oiling and greasing ii) Electronic equipment iii) Towers

Last Answer : Preventive maintenance schedule for SWT: I. Oiling and greasing: 1) Checking geared motor oil, greasing, lubrication and maintenance of drive train. 2) Changing oil, belts, bearing lubrication. 3 ... tower. 3) Every 6 months inspection for loop condition, safety norms, tower surface.

Description : Explain with neat sketch working of direct drive SWT. Give any two advantages of it over geared type SWT.

Last Answer : Direct Drive SWT: This plant has no gear box. Turbine blades are very light weight made up of stiff carbon fibre material. Blades are flat shaped. Due to this shape, lift increases. ... needed is less 4. More reliable 5. Better performance 6. Light weight 7. Less maintenance

Description : List any four mechanical and electrical faults in SWT.

Last Answer : Mechanical Faults in SWT: 1. Bearing and gearbox issue 2. Blade design , manufacturing, installation issue 3. Mechanical break down 4. Hydraulic failure 5. Nacelle ... failure, power regulator failure 12. Torque reversal due occasional connecting and disconnecting generator to grid

Description : Name any four main parts of SWT. Give function of each part.

Last Answer : Parts of SWT:  1. Rotor - It includes blades for converting wind energy to low speed rotational energy.  2. Gear box - It converts low speed rotational energy to high speed.  3. ... 5. Other Equipment: Control equipment, electric cables, hub, tale vane, sensors, anemometer to implement control.

Description : Name any two power electronic components in SWT.

Last Answer : Power Electronic Components in SWT: Boost converter Buck converter Buck Boost converter Cuk converter Voltage Source Inverter Current Source Inverter

Description : Give the classification of SWT on any two factors.

Last Answer : Classification of SWT: According to axis of rotor 1. Horizontal axis wind turbine 2. Vertical axis wind turbine According to direction 1. Up wind 2. Down wind According to number of blades 1 ... 1. Constant speed 2. Variable speed According to drive 1. Direct Drive 2. Geared Drive

Description : List various types of generators used in WPP.

Last Answer : Various Types of Generators Used in WPP: 1. Squirrel Cage Induction Generator ( SCIG ) 2. Wound Rotor Induction Generator ( WRIG ) 3. Doubly Fed Induction Generator ( DFIG ) 4. Wound Rotor synchronous Generator ( WRSG) 5. Permanent Magnet Synchronous Generator ( PMSG)

Description : Recommend & explain with neat sketch a suitable braking mechanism for the large WPP.

Last Answer : Braking Mechanism For The Large WPP: 1. Furling Mechanism: Furling allows the whole set of blades to change its position and blades turned away from wind, if wind speed is beyond safety limit. It ... 1.To harness optimum power from wind 2.To protect turbine in case of high wind speed.

Description : Explain scheduled maintenance of Stall Pitch, Active Pitch controlled of WPP.

Last Answer : Scheduled Maintenance of Stall Pitch: In scheduled maintenance of stall pitch, following maintenance activities are performed quarterly or yearly basis: 1. Grease the cable, which pulls the blade ... battery. In case of power failure, batteries will ensure the movement of blade to safe position.

Description : Identify & explain any two difficulties faced while connecting WPP to the power grid.

Last Answer : Difficulties Faced while Connecting WPP to Power Grid: There are several technical issues associated with grid connected systems like power quality issues, power and voltage fluctuations, storage, protection ... that is out of phase with grid voltage and so provide power factor correction.

Description : Identify the sensors for the following : i) Wind speed ii) RPM of generator shaft iii) Temperature in generator iv) Cable untwisting v) Vibration vi) Wind direction

Last Answer : i) Wind Speed : Anemometer. ii) RPM of Generator Shaft: Accelerometers. iii) Temperature in Generator: Thermistor, thermocouple, RTD. iv) Cable Untwisting : Cable Twisting sensor. v) Vibration : Accelerometer, piezoelectric. vi) Wind direction: Wind vane.

Description : Describe the general maintenance issues of the horizontal axis WPPs.

Last Answer : General Maintenance Issues of Horizontal Axis WPPs:  1. Gearbox failure.  2. Misalignment between generator and gearbox.  3. Problems related to lubrication.  4. Variation among the components by ... charging gear oil, brake pads, filters, bearings, sensors, actuators. 6. Bearing failure issue. 

Description : Related to WPP define following wind speeds  i) Cut in  ii) Cut out iii) Survival iv) Threshold

Last Answer : i) Cut-in wind speed: This is the minimum wind speed at which the turbine blades overcome friction and begin to rotate.  ii) Cut out speed: This is the speed at which the turbine ... this range, it is ensured that available energy is above the minimum threshold and structural health is maintained.

Description : Explain lift & drag wind energy conversion principle.

Last Answer : Two primary aerodynamic forces work in wind turbine rotors are:- 1) Lift which acts perpendicular to the direction of wind flow and 2) Drag acts parallel to wind flow. ... aero foil type blade offer better performance and higher rotational speed and make them ideal for power generation.

Description : Draw a block diagram of WPP substation. State function of each block.

Last Answer : Block Diagram of WPP Substation: OR Wind Turbine : Converts wind power to rotational mechanical energy Gear Box: Transfer low speed to high. Generator: Converts rotational ... to DC and vice-versa of correct frequency. Transformer: Step up the voltage to grid level.

Description : Prepare maintenance schedule of various actuators used in large wind power plants. 

Last Answer : Maintenance Schedule of Various Actuators: Maintenance of Yaw System Actuator: The maintenance of Yaw system actuator is done quarterly or yearly. Following maintenance activities are to be ... , then send alarming signal. 7.Monitor change in temperature, pressure and mechanical stresses. 

Description : List any four towers related to WPP. Explain any one in brief.

Last Answer : List of Towers Related to WPP: Tubular Steel / concrete Tower Lattice Tower Guyed Pole Tower Hybrid Tower 1. Tubular steel tower: Generally used for a large wind turbine and normally manufactured in ... type tower and thin, tall lattice type tower in the middle instead of single pole.

Description : Identify any two weekly maintenance activities for WPP.

Last Answer : Weekly Maintenance Activities: Routine checkup, monitoring, periodic reports. Blade cleaning. Higher voltage equipment maintenance. Turbines require periodic lubrication, oil changes. Bolt and electrical ... . Machine should be checked for corrosion. Check guy wire for proper tension.

Description : Name any two aerodynamic controls for WPP.

Last Answer : Aerodynamic Control for WPP: Pitch control Passive stall control Active stall control Yaw control

Description : List any two advantages of vertical axis WPPs.

Last Answer : Advantages of Vertical Axis WPPs: They can produce electricity in any wind direction. Low production cost as compared to horizontal axis wind turbine. Easy construction. Low maintenance ... weather conditions. Variable speed operation. Yaw and pitch control mechanism are not needed.

Description : State approximate wind power generation in India.

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Description : The main purpose of the Project Management Plan is to: a. provide justification for undertaking the project in terms of evaluating the benefit, cost and risk of  alternative options. b. ensure ... the  project. d. document the outcome of the risk, change and configuration management processes.

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