In this section, the single-phase two-level inverter and its functional operation are discussed.
Figure 1 shows the simulated circuit for the study of the single-phase two-level inverter.
The power flows from the DC side to the AC side.
The load is a combination in series of resistance, inductance, and a three-phase AC-source.
Notice that the AC-source can be interpreted as a back-electromotive force (BEMF) for motors applications or an electric generator for power grid applications.

Additionally, a capacitor can be inserted at the output of the inverter, preceded by an inductance, leading thus to an LC-filter.
The student can control (i) the amplitude of the DC source, (ii) the inverter parameters, namely, the PWM frequency and the reference amplitude, (iii) the AC-source parameters, namely, the amplitude, the frequency, and the phase-shift.

Figure 1: Simulated Circuit for the Study of the Single-Phase Two-Level Inverter

The rest of this laboratory is organized as follows:

• 3. Circuit description: Describes the circuit block by block, namely, (i) the converter topology, (ii) the control of the switches and the PWM generation (iii) the load and filter (iv) the circuit parameters and (v) the measurement stations.
• 4. Panels: Description of the panel.
  The two tabs associated with the two scenarios, namely, (i) Inverter Mode and (ii) LC Filter are covered in detail.
  The goal of this section is to explain to the students the functionalities of the control parameters, the control buttons, the scopes, the displays, and the help menu, making them capable of monitoring the panels and solving the exercises.
• 5. Exercises: All the exercises associated with the inverter mode, as well as the LC filtering.
  It is worth noticing that, for this level-one courseware, most of the exercises will consist of changing the control parameters/buttons and observing/interpreting the results.