A synchronous generator connected in parallel to an infinite power grid, if the excitation current remains unchanged, reduce the output active power(
) under the condition of, at this time ().
A.
The power Angle decreases and the power factor decreases
B.
The power factor decreases when the power Angle increases
C.
The power Angle decreases and the power factor increases
D.
As the power Angle increases, the power factor increases