09-08-2013, 11:34 PM
A NOVEL THREE PHASE THREE LEG AC-AC CONVERTERS USING NINE IGBTs
THREE-PHASE ac/dc/ac and ac/ac converters with variable frequency (VF) and variable voltage operation have found wide applications in the industry. The most popular configuration uses voltage source inverter (VSI) with a diode rectifier as the front end for adjustable speed drives (ASDs), uninterruptible power supplies (UPS), and other industrial applications.
It generates highly distorted input line currents and does not have regenerative or dynamic braking capability. pulse width modulation (PWM) voltage source rectifier is used to replace the diode rectifier.