4.1 Understanding the Panel

When starting the demo, the panel in figure 7 appears first with the default settings.

Figure 7: Start-Up Panel of the Single-Phase Inverter Laboratory – 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 3 below summarizes the control parameters, while table 4 is dedicated for 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 5 and 6.

Table 3: Control Parameters of the Single-Phase Two-Level Inverter

Table 4: Control Buttons and LED Fuse Status Indicators of the Single-Phase Inverter

On scope localization, the indices used will be like those of matrix elements.
Hence, the scope located at the upper left corner (first row, first column) is denoted Scope₁₁, while the scope in the upper right corner (first row, second column) is Scope₁₂.
By the same token, the scope in the lower left corner is Scope₂₁ while the scope in the lower right corner is Scope₂₂.

Table 5: Content of Scopes and Displayed Waveforms of the Single-Phase Inverter

Three power displays are available in all the scenarios.
They are located below the scopes in the observation section.
From left to right they are identified as Display₁, Display₂ and Display₃.
They refer to the power measurements described in section 3.5.
Additionally, two RMS voltage displays and two THD (related to inverter and load currents) displays, referred to as Display₄ to Display₇, are located below the scopes of Inverter mode and LC Filter scenarios.
Finally, an extra display, referred to as Display₈, is available for RMS filter current in the LC Filter scenario.

Table 6: Content of Displays of the Single-Phase Inverter

Consequently, the power dissipated in the LC Filter and the converter bridge can be deduced as shown in table 7:

Table 7: Power Dissipated in LC Filter and the Single-Phase Converter Bridge

4.2 First scenario - Inverter Mode with Load: R, L, AC-Source

When starting the demo, the panel corresponding to the Inverter Mode scenario opens by default, as shown in figure 7 above.
A concise scheme of the circuit is given below the tabs in the scenario selection area.
More details on the circuit, the control parameters, and buttons, as well as the observed waveforms are available when clicking the Help button.
The student can directly start exercises related to the Inverter Mode, available in section 5.1.

4.3 Second scenario – Adding LC Filter at the Inverter Output

When clicking on the “LC Filter” tab, the panel in figure 8 below is displayed.

Figure 8: Second Panel in the Single-Phase Inverter Laboratory – LC Filter Scenario

By clicking the Connect Filter button, the student activates the LC filtering and can start the exercises of section 5.2 that are associated with this scenario.