Design of passive filter based on magnetic integrated technology for single-phase grid-connected inverter

In response to the need for smaller and lighter power supply equipment, there has been a push towards higher power density in current power electronic converters. This development aligns well with the requirements of photovoltaic grid-connected inverters. Among various passive filters utilized in these inverters, the LCL filter stands out as a popular choice. Nevertheless, it should be noted that traditional LCL filters have limited core utilization and exhibit significant redundancy. In view of the above problems, this paper proposes a magnetic integrated passive filter based on ripple transfer technology and carries out volume optimization design. Compared to the conventional LCL filter, the magnetic integrated passive filter offers a reduction in size and weight while preserving its capability to ripples attenuate. Finally, a laboratory prototype with a rated power of 2 kW is built to verify the effectiveness of the proposed magnetic integrated passive filter. In this paper, a magnetic integrated passive filter based on ripple transfer technology is proposed, and the volume optimization design is carried out. The magnetic integrated passive filter reduces the size, weight, and inductance loss, while maintaining the ripple attenuation ability. image