Space vector based PWM sequences for Z-source principal derived inverter topologies

A digital implementation of various pulse width modulation sequences based on space vector approach for the case of Z-source inverter is presented in this paper. Each PWM sequence is studied with respect to two main control techniques, namely maximum boost and maximum constant boost. It is observed that when maximum boost control technique is applied, the number of switching in a sample is reduced as compared to the normal situation when there is no shoot through state inserted in the inverter states. Also, maximum boost control causes 120 degree clamping of each phase to positive dc bus for every sequence. Double switching sequences (advanced bus clamping PWM) are being explored first time in this paper for the case of Z-source inverter. The constraints on number and position of samples in a sector are highlighted in order to achieve symmetry in output voltage waveform. Experimental results have been presented to verify the concept.