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Slack bus
In electrical power systems a slack bus (or swing bus), defined as a Vδ bus, is used to balance the active power |P| and reactive power |Q| in a system while performing load flow studies. The slack bus is used to provide for system losses by emitting or absorbing active and/or reactive power to and from the system.
== Load flow studies ==
For power systems engineers, a load flow study explains the power system conditions at various intervals during operation.
The use of a slack bus has an inherent disadvantage when dealing with uncertain input variables: the slack bus must absorb all uncertainties arising from the system and thus must have the widest possible nodal power distributions. Even moderate amounts of uncertainty in a large system may allow the resulting distributions to contain values beyond the slack bus's margins.
A load flow approach able to directly incorporate uncertainties into the solution processes can be very useful. The results from such analyses give solutions over the range of the uncertainties, i.e., solutions that are sets of values or regions instead of single values.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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