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DFIG Motor Drive Exercise 2 DFIG Machine

Testing of Control for the Mitsubishi Drive and the Connection of the DFIG Machine

Materials Needed

  • Variable DC source (8821)
  • IGBT chopper/inverter (8857)
  • Inductance (8374)
  • A-QUAD dynamo (8540)
  • DFIG machine (8505)
  • Motor module (8506)
  • Resistance
  • Measurement (OP8660)

Test Procedure

Once again, before any high power connections are made various tests will be made.

First, we will test the speed and torque control of the Mitsubishi drive.

  • Make sure all modules are connected (see Cabling Connections).
  • Power up the motor drive and, using the touch screen interface, press Computer-Based Control.
  • The touch screen turns red to indicate that it is being controlled by the computer.
  • In the Dyno Control tab of the TestDrive interface, click the Start/Stop button to start the motor.

MotorDrive Control panel in TestDrive

Running the MAS_gen model and using the Matlab console, perform the following sequence:

  1. Change the Start/stop from 0 to 1
    1. The motor should remain still and produce a humming sound
    2. Using the touch screen panel, monitor the torque; it should be 0
  2. Change the Torque reference from 0 to 3
    1. The motor should remain still and produce a humming sound
    2. Using the touch screen panel, monitor the torque; it should be 0.3
  3. Change the Torque reference from 0.3 to 1
    1. The motor should start accelerating up to 300 RPM, this value can be monitored in the console and on the touch screen
    2. Using the touch screen panel, monitor the torque; it should be 1
  4. Change the start/stop from 1 to 0
    1. The motor should come to a complete stop

Now using the Lab-Volt module, refer to Annex C.

Schematic for test2

Note that not all current and voltage are monitored. The current and voltage of the source DC source are on the I1 and V1.

For the rotor, only phase A is connected to I2 and V2, use the connector 7 of the rotor for V2-.

The phase A of the load is connected to I3 and V3. You should also refer to Annex B to ensure no mistakes are made in the connection.

If mistakes are made, the simulated results will be different than the ones obtained with the real setup.

Once the circuit is complete, with the model running, start the motor with a speed of 300 rpm, a torque of 0.8 Nm, turning ON the power of the IGBT bridge and the variable voltage source.

Turning the rheostat slowly to about 40 volts, use the voltage display and make sure to select the right reading.

This time the waveform should also be superimposed except for the stator current whose frequency may be slightly different.

Results of second integration test

Increasing the voltage source to 80 volts, you should now find that the torque is insufficient: the motor should slow down, and make sure that the overvoltage LED from the motor module is not turned ON.

This test has shown the control of the Mitsubishi drive and the inverter module.

This completes the integration test and means the modules are ready to be used with the PF311_068 Wind_farm_4 model.

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