List of Figures

• Figure 1: Inverter Mode
• Figure 2: Rectifier Mode
• Figure 3: Three-Phase Three-Level NPC Converter
• Figure 4: First Arm of the NPC Converter
• Figure 5: PWM Generation for the First Arm of the NPC Converter
• Figure 6: Voltages V_AO, V_AN and V_AB
• Figure 7: Load and Filter in Inverter Mode
• Figure 8: Load and Filter in Rectifier Mode
• Figure 9: Measurements
• Figure 10: Start-Up Panel - Inverter Mode Scenario
• Figure 11: Second Panel - LC Filter Scenario
• Figure 12: Third Panel - Rectifier Mode Scenario
• Figure 13: Changing DC Voltage Source
• Figure 14: Changing AC-source Frequency
• Figure 15: Synchronize Button Activated 
• Figure 16: Changing AC-source Phase Shift; Load More Inductive
• Figure 17: Changing AC-source Phase Shift; Load More Capacitive
• Figure 18: Changing PWM Frequency
• Figure 19: Changing AC-source Amplitude to 75 V 
• Figure 20: Changing AC-source Amplitude to 82 V
• Figure 21: Changing AC-source Phase Shift; Load More Inductive
• Figure 22: Changing AC-source Phase Shift; Load More Capacitive
• Figure 23: Rectifier Mode; LC Filter ON
• Figure 24: Rectifier Mode; LC Filter ON & DC Load Connected

List of Tables

• Table 1: Voltage Levels at the Inverter Output
• Table 2: Converter Parameters and Nameplate Ratings
• Table 3: Control Parameters
• Table 4: Control Buttons and LED fuse status indicators
• Table 5: Content of Scopes and Displayed Waveforms
• Table 6: Content of Displays
• Table 7: Power Dissipated in LC Filter and Converter Bridge
• Table 8: Voltage Outputs and Associated Control Switches
• Table 9: Output Voltage Levels
• Table 10: Changing PWM Frequency with LC Filter ON
• Table 11: Changing PWM Frequency with LC Filter OFF