In this paper, an improved non-isolated DC-DC boost converter is proposed, which can be used in the distributed generation or storage system in the smart grid. The proposed circuit is composed of three insulated gate bipolar transistor (IGBT) power switches and separated into two stages. With the complementary single-sided multiple pulse width modulation (MPWM) operation of power switches in the first stage, the input current ripple of DC-DC converter can be effectively reduced. And the switched inductor in the second stage can provide high voltage gain for the applications of distributed generation. The performance of proposed converter can be verified with PSIM simulation software.