This component models a set of IEEE Standard 421.5-2016 DC exciter models. Models included are DC1C, DC2C, DC3A and DC4C. According to the standard, DC1A, DC2A and DC4B, introduced in the older revisions of the standard, may be replaced with the newer models (with appropriate new parameter selection, which are included in the new component).
The models provide a continuous DC current for the field winding of a synchronous machine using closed-loop control. The main theories behind this model are introduced in IEEE Std 421.5-2016.
The main objectives of an excitation system based on its application are as follows:
Constant terminal voltage: Helps a synchronous generator to maintain its terminal voltage at the desired level.
Constant power factor: Helps a synchronous motor to maintain its power factor at the desired level.
Inputs:
Ef0: Input for the corresponding synchronous machine output field voltage signal during the initialization period in per-unit [pu].
[VT/IT]: Input for the synchronous machine output RMS terminal voltage, real terminal current and imaginary terminal current, in 3-element signal array format.
Vref: Input for the desired reference voltage for the synchronous machine terminal in per-unit [pu].
VS: Input for the output signal generated by the corresponding power system stabilizer in per-unit [pu].
This input is provided only when using the exciter with a power system stabilizer. Please note that no VS input is available for exciter DC3A.
Outputs:
Ef: Outputs the calculated field voltage signal in per-unit, to be applied directly to the corresponding synchronous machine [pu].
Vref0: Outputs the initialized value of the reference voltage (Vref) in per-unit [pu]. This port is visible only if the parameter Output Internally Computed Initial Vref? is selected as Yes.
More: |
DC Exciter Transfer Functions (2016) |
DC1C: Rate Feedback Parameters
DC2C: Rate Feedback Parameters
DC4C: Rate Feedback Parameters