To accurately understand and grasp the inner link of umpteen topologies of Z-source/quasi Z-source inverters is a prerequisite for rational selection or design of novel Z-source inverters（ZSI）. Based on the analysis of characteristics

operating principle and evolution feasibility of traditional ZSI topology

and combined with the characteristics of the existing numerous topologies

the basic evolution mechanism of ZSI/quasi ZSI named location exchanging principle

replacement principle and enhancement principle are proposed. The connotation and application of each principle are elucidated. With the replacement principle and enhancement principle

many other novel topologies such as asymmetric ZSI topology with tapped inductor and symmetric enhanced ZSI topology can be evolved to meet the needs of practice. The simulation results show that

under the conditions of input voltage equals 48 V

shoot-through duty cycle equals 0.17

modulation ratio equals 0.8

the output voltage of the novel topology according to the proposed principles is 80 V

which are higher than those 35 V and 45 V of traditional and existing ones.