Page 55 – Complete Comparison of Multilevel Inverters
Subject: Power Electronics
Level: GATE / PSU / Interview Revision
🔹 1. Overview
There are three major types of Multilevel Inverters:
- Cascaded H-Bridge (CHB)
- Neutral Point Clamped (NPC)
- Flying Capacitor (FC)
🔹 2. Comparison Table
| Parameter | CHB | NPC | Flying Capacitor |
|---|---|---|---|
| DC Source | Multiple Isolated | Single (Split) | Single Source |
| Clamping Diodes | Not Required | (m−1)(m−2) | Not Required |
| Flying Capacitors | Not Required | Not Required | (m−1)(m−2)/2 |
| Switches per Phase | 4n | 2(m−1) | 2(m−1) |
| Voltage Stress | Vdc | Vdc/(m−1) | Vdc/(m−1) |
| Control Complexity | Simple | Medium | High |
| Main Issue | Multiple DC supplies | Neutral balancing | Capacitor balancing |
| Best Application | Solar, Drives | HVDC, FACTS | Reactive power control |
🔹 3. Quick Formula Summary
✔ CHB Levels = 2n + 1 ✔ NPC Diodes = (m−1)(m−2) ✔ FC Capacitors = (m−1)(m−2)/2 ✔ Switch stress (NPC & FC) = Vdc/(m−1) ✔ More levels → Lower THD
🔹 4. GATE Exam Trick
If question says:
• Multiple DC sources → CHB
• Many diodes → NPC
• Many capacitors → Flying Capacitor
Multilevel Inverter Comparison Series – Shaktimatha Learning
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