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The subsystem consists of three areas as shown in figure 2:
The grayarea is for receiving data from the simulator and monitoring the signals
The blue area labeled as “Inverters control”is used to control the simulated model or the test bench, adjust the DC reference voltage, and enable/disable the inverter control signals that are sent to the simulator.
The orange area presents important notes regarding the test instruction
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The “OpComm” block receives the signals sent from the SC_Offline_User_Interface subsystem.
The gray area simulates the inverter DC-link using SimPowerSystems’ universal IGBT bridge.
The blue area labeled “OP8219 and OP8662 IO Interface” is used to transfer data between the target and the OP8662 unit as well as the OP8219.
The DC bus control block diagram labeled as “DC-link Voltage Regulation” in the yellow area is shown in figure 4.
A PI-based cascaded voltage and current controller is developed in this area to control the three-phase currents of the inverter based on the desired voltage of the DC link.
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Make sure that the phase voltages of the grid are properly connected to a corresponding input terminal of the inverter (A-to-A, B-to-B, and C-to-C).
The phases can be distinguished using an oscilloscope.
A Mismatch between the sequence of the phases applied to the inverter leads to the trip of the inverter when the GSC controller is activated.Launch RT-LAB.
Import the model zip file (see below) in RT-LAB.
Build, load, and execute the model.
Ensure the Lab volt power supply unit 8525 is powered on and the voltmeter’s selection knob is set to AC 4-5.
Ensure the 8509 resistive load is switched off.
Increase the variable voltage knob to set the AC line voltage level to 55 Vrms.
Select the source or “Reference Control” (figure 12):
1: The model will run a simulation of a DC-bus control.
3: The model will control the Festo hardware to regulate a DC-bus.
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Based on the preceding tests, the hardware and software included in Festo models are declared fully functional and compliant with OPAL-RT specifications.
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