In DC systems, power typically flows from higher to lower voltage.
Not for AC systems
Power flows from higher to lower angles.
Voltage magnitude determines reactive power.
Angle difference determines actual power.
A slight angle variation can transmit hundreds of megawatts over lengthy transmission lines.
When reactance increases, angle separation needs to be larger and stability margins decrease.
This is why long transmission corridors is required.
Series compensation.
FACTS devices &
Thorough stability testing
Voltage is more important than conductor size.
Power follows angle, not voltage
Stability restricts transmission capability.
Understanding these fundamentals differentiates calculations from engineering.
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