4.6 NUETRAL POINT CLAMPED (NPC) INVERTERS
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14-10-2010, 10:46 AM



.ppt   NPC.ppt (Size: 203 KB / Downloads: 144)
4.6 NUETRAL POINT CLAMPED (NPC) INVERTERS


Known as three-level inverters

Problem of 2-level inverter in high-power applications
High DC link voltage requires series connection of devices  difficulty in dynamic voltage sharing during switching

Solved using NPC inverter or multilevel inverter

NPC inverter circuit


NPC (3)

DC link capacitor split to create neutral point 0

Q11, Q14 : main devices (2-level inverter)

Q12, Q13 : auxiliary devices – clamp output potential to neutral point with help of clamping diodes D10 D10’

All PWM techniques apply

NPC inverter operation
Consider HEPWM technique to eliminate 2 lowest significant harmonics (5th and 7th) and control fundamental voltage


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