Wind Power

Question 1

A __________________ is a rotating device used to convert the kinetic energy of the wind into electrical energy

Answer 1

Wind turbine

Question 2

Wind turbine axles can be ______________ or _______________.

Answer 2

Horizontal or vertical

Question 3

_________________ turbines are towed into place- minimal lift equipment is required

Answer 3

Floating

Question 4

T or F
Most wind generators that are of commercial interest generated AC and tie directly into the grid

Answer 4

True

Question 5

T or F
Power in wind turbines is not generated at high voltage

Answer 5

True

Question 6

Large GE turbines generate at _________ V coming down to a transformer that might typically step up voltage to possible _______kv

Answer 6

690v
34.5kV

Question 7

T or F
Wind turbine generators in grid tie systems do not match the system voltage and frequency by connection

Answer 7

False

Question 8

Maximum power transfer in an electric circuit occurs when the _________________ matches the __________________.

Answer 8

Load resistance
Source resistance

Question 9

Maximum power is transferred between mechanical source and load at a _______________________

Answer 9

Specific point of loading

Question 10

A DFIG is basically a _______________

Answer 10

Wound rotor motor

Question 11

______________________ and voltage enables the DFIG to remain synchronized with the grid while the wind turbine (rotor) speed varies

Answer 11

Varying rotor frequency

Question 12

DFIGs use the available wind resource more ____________ than a fixed speed wind turbine, especially during _____________________.

Answer 12

Efficiently
Light wind conditions

Question 13

T or F
The efficiency of the DFIG is not good

Answer 13

False

Question 14

By controlling blade _______________ and rotor_______________ ________________ power can be harnessed for a wide range of wind speeds

Answer 14

Blade pitch angle

Rotor frequency

Maximum power

Question 15

_____________________ control allows blades to be feathered at dangerously high wind speeds

Answer 15

Blade pitch angle

Question 16

T or F wind power output cables cannot over twist

Answer 16

True

Question 17

______________ and ________________ send signals to the controller

Answer 17

Angle sensors

Turn controllers

Question 18

The controller will be programmed for a maximum limit of ________________

Answer 18

Cable twists

Question 19

Basic parts of a small wind electric system are as follows

Answer 19

Rotor
Generator/alternator
Tail
Tower