Synchronous Machine Field Circuit

Synchronous machine field circuit per-unit interface with voltage input and current output

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Libraries:
Simscape / Electrical / Electromechanical / Synchronous

Description

The Synchronous Machine Field Circuit block applies specified voltage to, and measures current through, the field circuit of the synchronous machine that it is connected to.

The SI model converts the SI values that you enter in the dialog box to per-unit values for simulation. For information on the relationship between SI and per-unit machine parameters, see Per-Unit Conversion for Machine Parameters. For information on per-unit parameterization, see Per-Unit System of Units.

The block 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 physical signal input Efd defines the voltage, in V, and the physical signal output Ifd provides the current, in A.

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

This figure shows the pu model of the Synchronous Machine Field Circuit block.

This figure shows the SI model of the Synchronous Machine Field Circuit block.

Examples

Three-Phase Synchronous Machine Control

Control and initialize a Synchronous Machine (SM). The test circuit shows the SM operating as a generator. The terminal voltage is controlled using an AVR and the speed is controlled using a governor.

• Open Model

Ports

Input

Efd — Field voltage

physical

Physical input port associated with the field voltage.

Dependencies

This port is visible only when you set the PS input and output unit parameter to SI.

Efd_pu — Per unit field voltage

physical

Physical input port associated with the field voltage, in per-unit..

Dependencies

This port is visible only when you set the PS input and output unit parameter to Per unit.

Output

Ifd — Field current

physical

Physical input port associated with the field current.

Dependencies

This port is visible only when you set the PS input and output unit parameter to SI.

Ifd_pu — Per-unit field current

physical

Physical input port associated with the field current, in per-unit..

Dependencies

This port is visible only when you set the PS input and output unit parameter to Per unit.

Conserving

fd+ — Field winding positive terminal

electrical

Electrical conserving port associated with the field winding positive terminal.

fd- — Field winding negative terminal

electrical

Electrical conserving port associated with the field winding negative terminal.

Parameters

The additional parameters for this block are visibile only if you set the PS input and output unit parameter to Per unit.

Main

PS input and output unit — Unit-system configuration

SI (default) | Per unit

Unit-system configuration for the block.

Selecting:

• SI exposes the SI ports.

• Per unit exposes the per-unit ports and parameters.

Rated apparent power — Rated apparent power

555e6 V*A (default)

Rated apparent power of the connected machine.

Rated electrical frequency — Nominal electrical frequency

60 Hz (default)

Nominal electrical frequency at which rated apparent power of the connected machine is quoted.

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

Field circuit current (default) | Field circuit voltage

Choose between Field circuit voltage and Field circuit current.

Field circuit current — Field circuit current

1300 A (default)

This value is used to calculate the per-unit bases for the field circuit (nonreciprocal per-unit system).

Dependencies

This parameter is visible only when you set the Specify field circuit input required to produce rated terminal voltage at no load by parameter to Field circuit current.

Field circuit voltage — Field circuit voltage

92.95 V (default)

This value is used to calculate the per-unit bases for the field circuit (nonreciprocal per-unit system).

Dependencies

This parameter is visible only when you set the Specify field circuit input required to produce rated terminal voltage at no load by parameter to Field circuit voltage.

Machine Parameters

Specify parameterization by — Machine parameterization

Fundamental Parameters (default) | Standard Parameters

Choose between Fundamental Parameters and Standard Parameters.

Stator d-axis mutual inductance (unsaturated), Ladu — Stator d-axis mutual inductance (unsaturated)

1.66 (default)

Unsaturated stator d-axis mutual inductance.

Dependencies

This parameter is visible only when you set the Specify parameterization by parameter to Fundamental Parameters.

Rotor field circuit resistance, Rfd — Rotor field circuit resistance

0.0006 (default)

Rotor field-circuit resistance.

Dependencies

This parameter is visible only when you set the Specify parameterization by parameter to Fundamental Parameters.

Stator leakage reactance, Xl — Stator leakage reactance

0.15 (default)

Stator leakage reactance.

Dependencies

This parameter is visible only when you set the Specify parameterization by parameter to Standard Parameters.

d-axis synchronous reactance, Xd — d-axis synchronous reactance

1.81 (default)

The d-axis synchronous reactance.

Dependencies

This parameter is visible only when you set the Specify parameterization by parameter to Standard Parameters.

d-axis transient reactance, Xd' — d-axis transient reactance

0.3 (default)

The d-axis transient reactance.

Dependencies

This parameter is visible only when you set the Specify parameterization by parameter to Standard Parameters.

d-axis subtransient reactance, Xd'' — d-axis subtransient reactance

0.23 (default)

d-axis subtransient reactance.

Dependencies

This parameter is visible only when you set the Specify parameterization by parameter to Standard Parameters.

Specify d-axis time constant — d-axis time constant specification

Open-circuit value (default) | Short-circuit value

Choose between Open-circuit value and Short-circuit value.

Dependencies

This parameter is visible only when you set the Specify parameterization by parameter to Standard Parameters.

d-axis transient open-circuit, Td0' — d-axis transient open-circuit

8 s (default)

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

Dependencies

This parameter is visible only when you set the Specify parameterization by parameter to Standard Parameters and the Specify d-axis transient time constant to Open-circuit value.

d-axis transient short-circuit, Td' — d-axis transient short-circuit

1.3260 s (default)

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

Dependencies

This parameter is visible only when you set the Specify parameterization by parameter to Standard Parameters and the Specify d-axis transient time constant to Short-circuit value.

d-axis subtransient open-circuit, Td0'' — d-axis subtransient open-circuit

0.03 (default)

d-axis subtransient open-circuit.

Dependencies

This parameter is visible only when you set the Specify parameterization by parameter to Standard Parameters and the Specify d-axis transient time constant to Open-circuit value.

d-axis subtransient short-circuit, Td'' — d-axis subtransient short-circuit

0.0230 (default)

d-axis subtransient short-circuit.

Dependencies

This parameter is visible only when you set the Specify parameterization by parameter to Standard Parameters and the Specify d-axis transient time constant to Short-circuit value.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2014b