hi this is niranjani
im doing project in vienna rectifier..this is M.tech project ..can u please help me getting the PTT for three phase vienna rectifier

The Vienna Rectifier is a pulse-width modulation rectifier, invented in 1993 by Johann W. Kolar. It provides:

Three-phase three-level three-switch PWM rectifier with controlled output voltage.
Three-wire input, no connection to neutral.
Ohmic mains behaviour[citation needed]
Boost system (continuous input current).
Unidirectional power flow.
High power density.
Low conducted common-mode EMI emissions.
Simple control to stabilize the neutral point potential.
Low complexity, low realization effort
Low switching losses.
Reliable behaviour (guaranteeing ohmic mains behaviour) under heavily unbalanced mains voltages and in case of mains failure.