Three Phase Five Level Neutral Point Clamped Converter (NPC)

A three phase NPC converter is designed to use the proper voltage sharing across the power switches by using Multi-PWM technique.

An NPC module is often called a multi-level module. When an NPC module is used as in inverter operation, the DC-link voltage can be converted into a variable alternating voltage and variable frequency. In contrast to a half-bridge or sixpack, an NPC topology offers an additional voltage level at the output.

A new neutral-point-clamped pulsewidth modulation (PWM) inverter composed of main switching devices which operate as switches for PWM and auxiliary switching devices to clamp the output terminal potential to the neutral point potential has been developed. This inverter output contains less harmonic content as compared with that of a conventional type.