Question

If a voltage controlled bus is treated as a load bus, then which one of the following limits would be violated?
1. Voltage
2. Active power
3. Reactive power
4. Phase angle

Answer 1

Correct Answer - Option 3 : Reactive power

• A voltage-controlled bus is treated as a load bus in subsequent iteration when its reactive power is violated
• For violation of reactive power limit, the PV bus is treated as a PQ bus
• For the iteration, if Q is beyond the limit of Qmax or less than Qmin then choose the latest value from the limit and iterate it as a PV bus

 

Important Points:

The quantities specified for different type of buses shown in the below table.

Type of bus	Specified quantities	Unknown quantities
Generator bus (PV bus)	P, |V|	Q, δ
Load bus (PQ bus)	P, Q	|V|, δ
Slack bus	|V|, δ	P, Q