Sawtooth switching strategy implementation for Indirect Matrix Converter

The Indirect Matrix Converter (IMC) concept has been gaining recognition as a promising circuit alternative in recent years. An IMC has separate line and load side converters. Each switching period of line side converter is split into two portions. In each portion, the IMC is equivalent to a conventional inverter. Thus, output voltage can be obtained through applying a kind of space vector PWM to the load side converter. Conventional space vector pulse width modulation (CSVPWM) employs conventional switching sequence, which divides the zero vector time equally between two zero states in each modulation cycle. If a double edge CSVPWM used in each portion, each switch of the load side converter would have a switching frequency twice the sampling frequency. Therefore, bus-clamping PWM (BCPWM) techniques which use only one zero state in each modulation cycle can be used to reduce the switching frequency.