4xx - DC-AC Inverters
DC to AC power conversion and PWM control.
| Tutorial | Title | Difficulty | Materials |
| 401 | Single-Phase Inverter | ⅔ | circuit |
| 402 | Three-Phase Inverter | ⅔ | PDF + circuits |
| 403 | NPC 3-Level Inverter | 3/3 | README |
Learning Objectives
- Design single-phase PWM converters
- Understand three-phase inverter control
- Analyze voltage source rectifier (VSR) operation
- Study neutral-point-clamped (NPC) multilevel topology
- Compare two-level and multilevel inverters
Contents
401 - Single-Phase Inverter
singlePhase_PWM_converter.ipes - Basic PWM inverter with H-bridge
402 - Three-Phase Inverter
inverter.ipes - Three-phase inverter modelthree-phase_VSR_simpleControl_250kW.ipes - 250kW VSR with controlthree_phase_inverter.pdf / three_phase_inverter_solution.pdf - Exercises
403 - NPC 3-Level Inverter
- Comprehensive README with theory and design guide
- Neutral-point balancing concepts
- PWM strategies for multilevel
Quick Reference
Inverter Types
| Type | Levels | Applications |
| H-Bridge | 3 | Single-phase, low power |
| 3-Phase 2-Level | 2 | Motor drives, general |
| NPC 3-Level | 3 | High power, grid-tie |
| 5-Level | 5 | HVDC, large drives |
Modulation Techniques
| Method | Max Modulation | THD | Notes |
| SPWM | 1.0 | Higher | Simple |
| Third harmonic | 1.15 | Medium | +15% voltage |
| SVPWM | 1.15 | Lower | Best performance |
Prerequisites
- Complete 2xx DC-DC Converters (basics of switching)
- Understanding of three-phase systems
- PWM fundamentals (103 - PWM Basics)