IEEE (1992/2005) AC4A Model<br /></p><p><br /></p><p>The Type AC4A alternator-supplied controlled-rectifier excitation system is quite different from the other type ac systems. This high initial response excitation system utilizes a full thyristor bridge in the exciter output circuit.<br /></p><p>The voltage regulator controls the firing of the thyristor bridges. The exciter alternator uses an independent<br /></p><p>voltage regulator to control its output voltage to a constant value. These effects are not modeled; however,<br /></p><p>transient loading effects on the exciter alternator are included.<br /></p>