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DC-to-AC Converters LAB 2 - 8. Panel
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8.1 Understanding the Panel
When starting the demo, the panel in figure 23 appears first with the default settings.
Figure 23: Start-Up Panel - Inverter Mode Scenario
The panel is to be operated while following the three steps below:
Step 1: Select Scenario
In the upper left corner, the student can select the scenario using the two tabs:
Inverter Mode
LC Filter
Step 2: Change Parameters / Switch Buttons
In the lower left corner, the student can change the control parameters and can switch the control buttons (to enable/disable their associated functions) in the following categories:
Scope Parameters
Protection
DC Source
Inverter Parameters
AC Source
Table 13 summarizes the control parameters, while table 14 is dedicated to the control buttons.
Step 3: Observe Waveforms
On the right side, the student can observe the waveforms displayed in four scopes.
Additionally, the power flow, the fundamental voltage and total harmonic distortion (THD) for inverter and load are displayed.
More details are given in tables 15 and 16.
Control Parameters | Default Value | Interval of Variation |
|---|---|---|
DC Source Vdc (V) | 120 | [90; 160] |
PWM Frequency (Hz) | 3000 | [900; 3000] |
Reference Amplitude/modulation | 0.8 | [0; 0.8] |
AC-source Amplitude (V) | 70 | [0; 100] |
AC-source Frequency (Hz) | 60 | [0; 60] |
AC-source Phase-Shift (Deg) | 0 | [-90; 90] |
Table 13: Control Parameters
Note
The “Save File” under Scope Parameters allows the student to give different file names for data acquisition, while the “Switch (50 Hz/60 Hz)” allows to select a reference frequency for power, THD and RMS computation.
It is possible to save up to eleven .mat files with the name “FileSavedcurrents_X (where X can be anywhere from 0 to 10).
The student can give X values via the “Save File”, and press “Data Acq.” for acquiring data.
The data acquired can be used for offline harmonic studies.
The saved data are in the following folder:
C:\OPAL-RT\TestDrive\v2.9.0.16\Models\Package3_2_CPU\package3_cpu_sm_master\OpNTtarget
Control Buttons | Associated functions | |
|---|---|---|
Trigger |  | The waveforms are not triggered. They “move” |
| The waveforms are triggered with respect to a reference signal. | |
This button is accessible and enabled in all scenarios | ||
SYNCHRONIZE | | The reference frequency is fixed to 60 Hz (or 50 Hz). |
| The reference frequency used for the PWM generator is dictated by the AC-source frequency. | |
Apply Deadtime | | The dead-time is not applied in the control of the switches. |
| The dead-time is applied in the control of the switches. | |
Connect Filter | | The capacitors mounted in delta configuration are disconnected from the circuit. |
| The capacitors mounted in delta configuration are connected to the circuit, thus enabling the LC filter. | |
This button is accessible in LC Filter Mode scenario only | ||
Neutral | | The load neutral connection is disconnected from the DC bus. |
| The load neutral connection is connected to the DC bus. | |
This button is accessible in Inverter Mode scenario only | ||
Data Acq. | | Data acquisition is disabled. |
| Data acquisition is activated and allows to record .mat files for offline studies, in particular harmonic analysis. | |
Reset | | The reset push button is disabled. |
| The reset push button is activated and simulates replacement of fuses after a fault. | |
| This button is accessible and enabled in all scenarios | |
HELP / BACK | | Open the Help page associated to the scenario currently running. |
| Close the Help page and go back to the simulations. | |
This button is accessible and enabled in all scenarios | ||
Fuse | | The protection fuse is blown. |
| The protection fuse is intact. | |
Switch | | Reference frequency for PWM generation, 50 Hz or 60 Hz. |