公开(公告)号：US20240266972A1

公开(公告)日：2024-08-08

申请号：US18640731

申请日：2024-04-19

申请人： Huawei Technologies Co., Ltd.

发明人： Sebastian Rosado ,  Zhaohui Wang ,  Miroljub Bakic ,  Piniwan Thiwanka Bandara Wijekoon

IPC分类号： H02M7/483 ,  H02M1/00 ,  H02M3/335 ,  H02M7/493

CPC分类号： H02M7/4833 ,  H02M1/0043 ,  H02M7/493 ,  H02M3/33584

摘要： A power conversion system includes a first direct current to alternating current (DC-AC) inverter, a second DC-AC inverter, an inverter controller, a direct current (DC)-link circuit connecting the first DC-AC inverter and the second DC-AC inverter, a neutral-point balancer (NPB), an NPB circuit, and an NPB controller. The inverter controller is configured to provide a pulse-width modulation (PWM), signal to the first DC-AC inverter and the second DC-AC inverter. The NPB circuit is configured to reduce low frequency current oscillations in the DC-link circuit by switching between a first state for transferring charge from a positive voltage line to a neutral voltage line, and a second state for transferring charge from the neutral voltage line to a negative voltage line. The NPB controller is configured to control the switching of the NPB circuit and is synchronized with the PWM signal from the inverter controller.