IEEE (2005) AC7B Model<br /></p><p><br /></p><p>These excitation systems consist of an ac alternator with either stationary or rotating rectifiers to produce the<br /></p><p>dc field requirements. Upgrades to earlier ac excitation systems, which replace only the controls but retain<br /></p><p>the ac alternator and diode rectifier bridge, have resulted in this new model. Some of the features of this excitation system include a high bandwidth inner loop regulating generator field voltage<br /></p><p>or exciter current (KF2, KF1), a fast exciter current limit, VFEMAX, to protect the field of the ac alternator, and<br /></p><p>the PID generator voltage regulator (AVR). An alternative rate feedback loop (KF, TF) is provided for<br /></p><p>stabilization if the AVR does not include a derivative term. If a PSS control is supplied, the Type PSS2B or<br /></p><p>PSS3B models are appropriate.<br /></p>