: Public Class
Created: 02/02/2012 20:08:59
Modified: 23/04/2012 09:00:49
Project:
Advanced:
The class represents IEEE Std 421.5-2005 type AC4A model. The model represents type AC4A alternator-supplied controlled-rectifier excitation system which 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.  The voltage regulator controls the firing of the thyristor bridges. The exciter alternator uses an independent voltage regulator to control its output voltage to a constant value. These effects are not modeled; however, transient loading effects on the exciter alternator are included.<br/><br/><br/>Reference: IEEE Standard 421.5-2005 Section 6.4.<br/>
Attribute
Public PU
  ka
Details:
Notes: Voltage regulator gain (K<sub>A</sub>).  Typical Value = 200.<br/>
Public PU
  kc
Details:
Notes: Rectifier loading factor proportional to commutating reactance (K<sub>C</sub>).  Typical Value = 0.<br/>
Public Seconds
  ta
Details:
Notes: Voltage regulator time constant (T<sub>A</sub>).  Typical Value = 0.015.<br/>
Public Seconds
  tb
Details:
Notes: Voltage regulator time constant (T<sub>B</sub>).  Typical Value = 10.<br/>
Public Seconds
  tc
Details:
Notes: Voltage regulator time constant (T<sub>C</sub>).  Typical Value = 1.<br/>
Public PU
  vimax
Details:
Notes: Maximum voltage regulator input limit (V<sub>IMAX</sub>).  Typical Value = 10.<br/>
Public PU
  vimin
Details:
Notes: Minimum voltage regulator input limit (V<sub>IMIN</sub>).  Typical Value = -10.<br/>
Public PU
  vrmax
Details:
Notes: Maximum voltage regulator output (V<sub>RMAX</sub>).  Typical Value = 5.64.<br/>
Public PU
  vrmin
Details:
Notes: Minimum voltage regulator output (V<sub>RMIN</sub>).  Typical Value = -4.53.<br/>
Object Type Connection Direction Notes
ExcitationSystemDynamics Class Generalization To