Abstract: This paper proposed a novel half quasi-Z-source inverter（H-q ZSI） for grid-connected wind power generation systems, which can reduce the generator stator current harmonics and the input inductor current ripple in a great deal. The operation principle of H-q ZSI was discussed in detail, when the input inductor operates in the continuous conduction mode（CCM）. When H-q ZSI operates in the shoot-through zero state, the derivative of generator stator currents is only determined by the instantaneous value of generator stator voltages, so the nonlinear relationship between generator stator currents and stator voltages is improved comparing with the traditional impedance-source inverter. The input inductor current ripple can be calculated according to the maximum and the minimum values of inductor currents in each switching transit moment. It was indicated that input inductor current ripple can be reduced effectively by means of the proposed H-q ZSI. Finally, simulation and experimental results were given to verify the theoretical analysis.