[L8]_WIND TURBINES AND THE GRID

Question 1

ENGY-688

(True/False): A one-line riser diagram represents all the mechanical components of a wind turbine generation system.

[L8]

Answer 1

False. It represents all electrical components, including wires, wire sizes, shielding, and grounding.

[L8]

Question 2

ENGY-688

Match the components to their primary role in a wind turbine system:

A. Generator grounding
B. Power electronics converter
C. Soft starter

1. Controls in-rush current
2. Provides phase compensation and AC-DC-AC conversion
3. Ensures safety during fault conditions

[L8]

Answer 2

A: 3
B: 2
C: 1

[L8]

Question 3

ENGY-688

What is the primary material used in ACSR 26/7 cables for overhead transmission lines?

A. Pure aluminum
B. Aluminum Conductor Steel Reinforced
C. Aluminum Composite Conductor Reinforced
D. Copper

[L8]

Answer 3

B. Aluminum Conductor Steel Reinforced

[L8]

Question 4

ENGY-688

(True/False): Wind turbine generator (WTG) projects under 10 MW typically connect to transmission lines.

[L8]

Answer 4

False. They connect to distribution lines.

[L8]

Question 5

ENGY-688

(Multiple Choice): What is the minimum power factor wind farms are required to maintain since 2005?

A. 0.85
B. 0.90
C. 0.95
D. 1.00

[L8]

Answer 5

C. 0.95

[L8]

Question 6

ENGY-688

(True/False): Power flow studies analyze if energy transfer from generators to consumers meets grid requirements in terms of voltage levels and line loading.

[L8]

Answer 6

True

[L8]

Question 7

ENGY-688

(True/False): A lower power factor reduces the apparent power required for a system to produce the same amount of real power.

[L8]

Answer 7

False. A higher power factor reduces the apparent power required.

[L8]

Question 8

ENGY-688

What is the maximum allowable voltage drop duration for low-voltage ride-through (LVRT)?

A. 0.5 seconds
B. 0.625 seconds
C. 1 second
D. 1.5 seconds

[L8]

Answer 8

B. 0.625 seconds

[L8]

Question 9

ENGY-688

(True/False): Harmonics in wind turbines are caused by the imperfect sinusoidal wave generated during the AC-DC-AC conversion stage.

[L8]

Answer 9

True.

[L8]

Question 10

ENGY-688

Match the wind farm layouts to their descriptions:

A. Radial
B. Feeder-sub-feeder
C. Looped feeder

1. High redundancy, minimizes generator downtime.
2. Most commonly used layout.
3. Lowest cost but highest risk of system downtime.

[L8]

Answer 10

A: 3
B: 2
C: 1

[L8]

Question 11

ENGY-688

(True/False): Intelligent electronic devices (IEDs) in WTGs are responsible for real-time protection, monitoring, and logic system operations.

[L8]

Answer 11

True.

[L8]

Question 12

ENGY-688

Which interconnection request type is for systems greater than 20 MW?

A. SGIR
B. LGIR
C. AGIR
D. TGIR

[L8]

Answer 12

B. LGIR

[L8]

Question 13

ENGY-688

What is the typical reaction time for circuit breakers in WTG protection systems?

A. 0.05 seconds
B. 0.1 seconds
C. 0.5 seconds
D. 1 second

[L8]

Answer 13

B. 0.1 seconds

[L8]

Question 14

ENGY-688

(True/False): Grounding systems in wind turbines ensure equipotential bonding among all metallic components.

[L8]

Answer 14

True

[L8]

Question 15

ENGY-688

Which standard governs lightning protection design for WTGs?

A. IEEE 1547
B. IEC 61400-24
C. NFPA 70
D. EN 55022

[L8]

Answer 15

B. IEC 61400-24

[L8]