Documentation

Synchronous Machine Field Circuit (pu)

Synchronous machine field circuit per-unit voltage supply and current measurement

Library

Machines

Description

The Synchronous Machine Field Circuit (pu) block applies specified voltage to, and measures current through, the field circuit of the synchronous machine that it is connected to. It includes an electrical reference. The physical signal input Efd_pu defines the voltage and the physical signal output Ifd_pu provides the current, both in per-unit.

The per-unit bases are the nonreciprocal per-unit system, Efd and Ifd, rather than the reciprocal per-unit system, efd and ifd.

The figure shows the schematic for the Synchronous Machine Field Circuit (pu) block.

Parameters

Main Tab

Rated apparent power

Rated apparent power of the connected machine. The default value is 555e6 V*A.

Rated electrical frequency

Nominal electrical frequency at which rated apparent power of the connected machine is quoted. The default value is 60 Hz.

Specify field circuit input required to produce rated terminal voltage at no load by

Choose between Field circuit voltage and Field circuit current. The default value is Field circuit current.

Field circuit current

This value is used to calculate the per-unit bases for the field circuit (nonreciprocal per-unit system). This parameter is visible only when Specify field circuit input required to produce rated terminal voltage at no load by is set to Field circuit current. The default value is 1300 A.

Field circuit voltage

This value is used to calculate the per-unit bases for the field circuit (nonreciprocal per-unit system). This parameter is visible only when Specify field circuit input required to produce rated terminal voltage at no load by is set to Field circuit voltage. The default value is 92.95 V.

Machine Parameters Tab

Specify parameterization by

Choose between Fundamental Parameters and Standard Parameters. The default value is Fundamental Parameters.

Stator d-axis mutual inductance (unsaturated), Ladu

Unsaturated stator d-axis mutual inductance. This parameter is visible only when Specify parameterization by is set to Fundamental Parameters. The default value is 1.66 pu.

Rotor field circuit resistance, Rfd

Rotor field-circuit resistance. This parameter is visible only when Specify parameterization by is set to Fundamental Parameters. The default value is 0.0006 pu.

Stator leakage reactance, Xl

Stator leakage reactance. This parameter is visible only when Specify parameterization by is set to Standard Parameters. The default value is 0.15 pu.

d-axis synchronous reactance, Xd

The d-axis synchronous reactance. This parameter is visible only when Specify parameterization by is set to Standard Parameters. The default value is 1.81 pu.

d-axis transient reactance, Xd'

The d-axis transient reactance. This parameter is visible only when Specify parameterization by is set to Standard Parameters. The default value is 0.3 pu.

Specify d-axis transient time constant by

This parameter is visible only when Specify parameterization by is set to Standard Parameters. Choose between Open-circuit value and Short-circuit value. The default value is Open-circuit value.

d-axis transient open-circuit, Td0'

The d-axis transient open-circuit time constant. This parameter is visible only when Specify d-axis transient time constant by is set to Open-circuit value. The default value is 8 s.

d-axis transient short-circuit, Td'

The d-axis transient short-circuit time constant. This parameter is visible only when Specify d-axis transient time constant by is set to Short-circuit value. The default value is 1.326 s.

Ports

The block has the following ports:

Efd_pu

Field voltage input, per-unit

Ifd_pu

Field current output, per-unit

fd+

Electrical conserving port corresponding to the field winding positive terminal

fd-

Electrical conserving port corresponding to the field winding negative terminal

Introduced in R2014b

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