WOLFRAM SYSTEM MODELER

SMEE_DOL

ElectricalExcitedSynchronousMachine starting direct on line

Diagram

Wolfram Language

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SystemModel["Modelica.Magnetic.FundamentalWave.Examples.BasicMachines.SynchronousMachines.SMEE_DOL"]
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Information

This information is part of the Modelica Standard Library maintained by the Modelica Association.

An electrically excited synchronous generator is started direct on line utilizing the damper cage (and the shorted excitation winding) at 0 seconds.

At t = 0.5 seconds, the excitation voltage is raised to achieve the no-load excitation current. Note, that reactive power of the stator goes to zero.

At t = 2 second, a driving torque step is applied to the shaft (i.e. the turbine is activated). Note, that the active (and the reactive) power of the stator change. To drive at higher torque, i.e., produce more electric power, excitation has to be adapted.

Simulate for 3 seconds and plot:

  • smee.tauElectrical: electric torque
  • smee.wMechanical: mechanical speed
  • currentRMSSensor.I: quasi RMS stator current
  • irRMS: quasi RMS rotor current
  • smee.ie: excitation current
  • rotorDisplacementAngle.rotorDisplacementAngle: rotor displacement angle
  • electricalSensor.powerTotal: total electric real power
  • mechanicalSensor.power: mechanical power

Default machine parameters are used.

Note

The mains switch is closed at time = 0 in order to avoid non physical noise calculated by the rotorDisplacementAngle. This noise is caused by the interaction of the high resistance of the switch and the machine, see #2388.

Parameters (6)

m

Value: 3

Type: Integer

Description: Number of phases

VNominal

Value: 100

Type: Voltage (V)

Description: Nominal RMS voltage per phase

fNominal

Value: 50

Type: Frequency (Hz)

Description: Nominal frequency

Ve

Value: smeeData.Re * smeeData.IeOpenCircuit

Type: Voltage (V)

Description: Excitation current

gamma0

Value: 0

Type: Angle (rad)

Description: Initial rotor displacement angle

smeeData

Value:

Type: SynchronousMachineData

Description: Synchronous machine data

Connectors (1)

irRMS

Type: RealOutput

Description: Damper cage RMS current

Components (16)

smee

Type: SM_ElectricalExcited

Description: Electrical excited synchronous machine with optional damper cage

rotorDisplacementAngle

Type: RotorDisplacementAngle

Description: Rotor lagging angle

groundExcitation

Type: Ground

Description: Ground node

mechanicalSensor

Type: MultiSensor

Description: Ideal sensor to measure the torque and power between two flanges (= flange_a.tau*der(flange_a.phi)) and the absolute angular velocity

electricalSensor

Type: MultiSensor

Description: Polyphase sensor to measure current, voltage and power

currentRMSSensor

Type: CurrentQuasiRMSSensor

Description: Continuous quasi current RMS sensor for polyphase system

sineVoltage

Type: SineVoltage

Description: Polyphase sine voltage source

star

Type: Star

Description: Star-connection

ground

Type: Ground

Description: Ground node

rampVoltage

Type: RampVoltage

Description: Ramp voltage source

terminalBox

Type: TerminalBox

Description: Terminal box Y/D-connection

smeeData

Type: SynchronousMachineData

Description: Synchronous machine data

switch

Type: IdealClosingSwitch

Description: Polyphase ideal closer

booleanStep

Type: BooleanStep

Description: Generate step signal of type Boolean

booleanReplicator

Type: BooleanReplicator

Description: Boolean signal replicator

torqueStep

Type: TorqueStep

Description: Constant torque, not dependent on speed