
A ‘Slack’ bus (or ‘swing’ bus) is defined as Vδ bus, that is used to balance the active |P| & reactive power |Q| in the system while performing Load flow studies in Electrical Power Systems. For Power Engineers, Load flow study is very important as it explains the power system conditions at various intervals during operation. Slack Bus is...
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http://en.wikipedia.org/wiki/Slack_bus

an infinite bus where the voltage magnitude is predetermined and which is at the same time reference node and balancing bus
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=603-02-32
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