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.

Table 13: Control Parameters

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.

Table 14: Control Buttons and LED Fuse Status Indicators

On scope localization, the indices used will be like those of matrix elements.
Hence, the scope located in 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 15: Content of Scopes and Displayed Waveforms

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 7.5.

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 16: Content of Displays

Consequently, the power dissipated in the LC Filter and the converter bridge can be deduced as shown in table 17 below:

Table 17: Power Dissipated in LC Filter and Converter Bridge

8.2 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 23 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 9.2.

8.3 Second Scenario - Adding LC Filter at the Inverter Output

When clicking on the “LC Filter” tab, the panel in figure 24 is displayed.

Figure 24: Second Panel – LC Filter Scenario

By clicking the Connect Filter button, the student activates the LC filtering and can start the exercises of section 9.3 that are associated with this scenario.