Renewable Energy Engineering: Wind Energy Systems

A: Driving yaw from SCADA risks dragging engaged brakes and scoring the ring gear. Checking motor phase rotation before brake release can give a false pass because motors are still mechanically locked. PLC limit switch checks don't confirm the hydraulic system is ready to move. Verifying brake release pressure first prevents mechanical damage and sets the condition for all later functional tests.

A: 0.33 MW comes from dropping the 0.5 factor in the power equation. 0.52 MW results from using rotor radius instead of diameter in the swept area. 1.48 MW assumes Cp close to the Betz limit rather than the stated value. 1.04 MW follows P = 0.5ρACpV³ with the given numbers and units carried correctly.

A: Assuming the GA overrides risks underspecifying protection without checking the fault basis. Treating the datasheet as transient only ignores how breakers are thermally rated. Peak-to-RMS conversion doesn't reconcile these specific numbers. Generator breakers are typically specified on symmetrical RMS fault current, making the datasheet the governing value.

A: Static tower collapse isn't the first response to overspeed. Bearing wear is a long-term effect, not an acute failure. Yaw control doesn't govern rotor speed under loss of grid. Uncontrolled acceleration drives centrifugal and aerodynamic loads past blade design limits.