Temporary Utility Data

The utility bus type used in modeling the power flow simulation. When you choose a model, those fields which are unavailable are dimmed.

• Swing: A swing bus holds the bus voltage and angle constant. To do this there cannot be limits on the amount of MW or MVAR the swing machine can accept or provide.
• PV: Constant power, constant voltage utility. This is also known as a regulated utility. This model tries to hold a user-specified bus voltage within utility MVAR limits.
• PQG: Constant power, constant var utility. This is also known as an unregulated utility. This model holds the MVAR generation within given voltage limits.

The utility output MW. This may be actual operating or a rated value. This applies only to a PV or PQG utility.

The utility output MVAR. This is only used when the utility is a constant power, constant var (PQG) machine or when a PV utility MVAR limit has been reached and the machine automatically switches to PQG.

The minimum and maximum MVAR limits for a regulated utility (PV). The utility will switch to type PQG if these limits are violated.

The desired control voltage for a regulated utility (PV). The utility will try to control the voltage at the controlled bus to a given value. If the utility bus is the swing bus, this voltage serves as the reference voltage. The voltage is entered in per-unit.