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Example Model

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Example Model

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To practically demonstrate the operation of PELab-6PH, a generic model is developed that allows the user to test the power modules of the unit in a stand-alone mode of operation. Through this model, the user is able to control the modulation index, fundamental frequency, switching frequency besides observing all the measured signals and faults.

Schematic Diagrams

Figure 9 presents the circuit diagram of the PELab power modules and measurements in the stand-alone mode. As demonstrated, the DC links of both modules are connected to an ITECH power supply to feed the loads connected on the AC side of the converters. The external voltage and current measurements are also connected to the power modules for monitoring the input DC current, as well as the line voltages.

image-20240402-204121.png
Figure 9. Schematic diagram of the test bench configured for the example model

The necessary power and sensor connections with respect to the model schematic are illustrated in figure 10. As shown, a single unit ITECH power supply is used to feed both power modules. The cut-off switches are used between the output of the modules and the loads. The three-phase load banks are configured using resistive heater fans. The external voltage and current sensors are also involved in demonstrating their performance. Accordingly, V1 and V2 are used to measure the first and second line-to-line voltages of the first module, while V3 and V4 measure the same voltages of the other module. The external current sensors, including i1 and i2, are respectively measuring the input DC current of module1 and module2.

image-20240402-204228.png
Figure 10. Power and sensor connections on the back panel

Test Setup Specifications

The model and test setup specifications are presented in table 8.

Table 8. Model and test setup parameters

Parameter

Unit

Value

Parameter

Unit

Value

Maximum DC voltage

Volt

500 V

Maximum DC current

Ampere

15 A

Maximum switching frequency

Hertz

50 kHz

ITECH voltage rise time

Second

15 s

Switching dead time

Micro second

0.6 us

Control sampling time

Micro second

20 us

Maximum load power

Watt

5 kW

Simulator model

-

OP4512

Bitstream model

-

TE0741_3-EX-0001-3_2_10_45-IOConfig1_4OP8110SFP-01-01.bin

This model is developed and tested on an OP4512 simulator with the I/O configurations shown on the left column in figure 11. It can be used as it is for an OP4610XG simulator with a similar I/O configuration.

If the power supply is not ITECH make sure that the voltage is not stepped up immediately after enabling the output. Otherwise, it will damage the DC-link capacitors. Accordingly, use a power supply with a controllable slew rate or voltage rise time.

RT-LAB Model Descriptions

Figure 12 depicts the overall view of the computation and user interface subsystems that are used to control and monitor the PELab unit in the stand-alone configuration.

User Interface Dashboard

The user dashboard shown in figure 13 runs on the user PC. This interface allows the user to control the modulation index, adjust the fundamental frequency, set the switching frequency, enable or disable the PWM signals, and monitor the measured analog signals besides the fault flags.

The following table details the function of each subsystem block and scope exist in the user interface. Please note that the control and monitoring features of both modules in the user interface are identical.

Table 9. Detailed description of the user interface subsystem

Block

Function

Block

Function

 

Receives the fundamental frequency and the modulation index and then transfers them to the simulator to generate the switching reference signal

 

 

Sets the switching frequency from 2 kHz to 50 kHz