ExcIEEEAC3A
Class Description
IEEE 421.5-2005 type AC3A model. The model represents the field-controlled alternator-rectifier excitation systems designated type AC3A. These excitation systems include an alternator main exciter with non-controlled rectifiers. The exciter employs self-excitation, and the voltage regulator power is derived from the exciter output voltage. Therefore, this system has an additional nonlinearity, simulated by the use of a multiplier whose inputs are the voltage regulator command signal, <i>Va</i>, and the exciter output voltage, <i>Efd</i>, times <i>K</i><i><sub>R</sub></i>. This model is applicable to excitation systems employing static voltage regulators. Reference: IEEE 421.5-2005, 6.3.
Attributes
| Name | Type | Description |
|---|---|---|
| efdn | PU | Value of <i>Efd </i>at which feedback gain changes (<i>E</i><i><sub>FDN</sub></i>) (> 0). Typical value = 2,36. |
| ka | PU | Voltage regulator gain (<i>K</i><i><sub>A</sub></i>) (> 0). Typical value = 45,62. |
| kc | PU | Rectifier loading factor proportional to commutating reactance (<i>K</i><i><sub>C</sub></i>) (>= 0). Typical value = 0,104. |
| kd | PU | Demagnetizing factor, a function of exciter alternator reactances (<i>K</i><i><sub>D</sub></i>) (>= 0). Typical value = 0,499. |
| ke | PU | Exciter constant related to self-excited field (<i>K</i><i><sub>E</sub></i>). Typical value = 1. |
| kf | PU | Excitation control system stabilizer gains (<i>K</i><i><sub>F</sub></i>) (>= 0). Typical value = 0,143. |
| kn | PU | Excitation control system stabilizer gain (<i>K</i><i><sub>N</sub></i>) (>= 0). Typical value = 0,05. |
| kr | PU | Constant associated with regulator and alternator field power supply (<i>K</i><i><sub>R</sub></i>) (> 0). Typical value = 3,77. |
| seve1 | Float | Exciter saturation function value at the corresponding exciter voltage, <i>V</i><i><sub>E1</sub></i>, back of commutating reactance (<i>S</i><i><sub>E</sub></i><i>[V</i><i><sub>E1</sub></i><i>]</i>) (>= 0). Typical value = 1,143. |
| seve2 | Float | Exciter saturation function value at the corresponding exciter voltage, <i>V</i><i><sub>E2</sub></i>, back of commutating reactance (<i>S</i><i><sub>E</sub></i><i>[V</i><i><sub>E2</sub></i><i>]</i>) (>= 0). Typical value = 0,1. |
| ta | Seconds | Voltage regulator time constant (<i>T</i><i><sub>A</sub></i>) (> 0). Typical value = 0,013. |
| tb | Seconds | Voltage regulator time constant (<i>T</i><i><sub>B</sub></i>) (>= 0). Typical value = 0. |
| tc | Seconds | Voltage regulator time constant (<i>T</i><i><sub>C</sub></i>) (>= 0). Typical value = 0. |
| te | Seconds | Exciter time constant, integration rate associated with exciter control (<i>T</i><i><sub>E</sub></i>) (> 0). Typical value = 1,17. |
| tf | Seconds | Excitation control system stabilizer time constant (<i>T</i><i><sub>F</sub></i>) (> 0). Typical value = 1. |
| vamax | PU | Maximum voltage regulator output (<i>V</i><i><sub>AMAX</sub></i>) (> 0). Typical value = 1. |
| vamin | PU | Minimum voltage regulator output (<i>V</i><i><sub>AMIN</sub></i>) (< 0). Typical value = -0,95. |
| ve1 | PU | Exciter alternator output voltages back of commutating reactance at which saturation is defined (<i>V</i><i><sub>E1</sub></i>) (> 0). Typical value = 6,24. |
| ve2 | PU | Exciter alternator output voltages back of commutating reactance at which saturation is defined (<i>V</i><i><sub>E2</sub></i>) (> 0). Typical value = 4,68. |
| vemin | PU | Minimum exciter voltage output (<i>V</i><i><sub>EMIN</sub></i>) (<= 0). Typical value = 0. |
| vfemax | PU | Exciter field current limit reference (<i>V</i><i><sub>FEMAX</sub></i>) (>= 0). Typical value = 16. |
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