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3. Alternating current (AC) sources
3.1 Synchronous generator
The alternator is the most widely used rotating machine for generating alternating current. Alternators are generally three-phase, which is what we're talking about here. They are "excited" either by a permanent magnet, or by a field winding through which direct current flows.
In the case of line flow, a simple alternator model can be that of an ELR circuit (figure 12 ).
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Alternating current (AC) sources
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