Abstract: The traditional current source inverter has a large DC side inductance value,which has some limitations when applied to medium and small power systems. To solve this problem,this paper analyzes the DC inductor,and finally obtains the relationship between inductance value and inductance current. On this basis,a nonlinear carrier modulation strategy based on the area equivalent principle is proposed. When the DC side adopts a smaller inductor,the output current quality of the AC side is still higher,which effectively solves the problem that the inductor is too large when the single-phase current source inverter is applied to medium and small power systems. Based on the above analysis,the corresponding experimental platform is built to verify the correctness of the theory and simulation.