新能源发电系统要求逆变器具有宽输入电压适应能力，该文基于有源升降压逆变器拓扑，对恒升压比调制和双模态调制两种调制方法进行对比。双模态调制根据不同的直流输入与瞬时的交流输出电压大小关系，使电路呈现出不同的等效电路结构，且每种结构均只有部分开关管高频工作，有利于提高变换效率。还对两种调制下电感电流、开关管电流应力进行分析比较。实验结果表明，该变换器可双模式工作，具有宽输入电压适应能力。“,”The inverter used in new energy power generation system should have the ability to adapt a wide range of DC input voltage. Based on the active buck-boost inverter which consists of a full bridge and Boost AC/AC part, two modulation methods were compared: constant boost ratio modulation and dual mode modulation. Along with the relationship of the input DC voltage and the reference AC voltage, the converter completes buck or boost inversion with different equivalent circuits and there are fewer switches working at high frequency in dual mode modulation, which is in favor of the system with high efficiency. The current of the inductor and the current stress of the switches was analyzed in this paper. Experimental results were presented to verify that the proposed topology can achieve dual mode operation with wide range of input voltage.