US 12,224,682 B2
Common-mode voltage injection control method and apparatus for inverter
Xinyu Yu, Shanghai (CN); Kai Xin, Shanghai (CN); Peng Dong, Shanghai (CN); and Junjie Li, Shanghai (CN)
Assigned to Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed on Jan. 13, 2023, as Appl. No. 18/154,277.
Application 18/154,277 is a continuation of application No. PCT/CN2020/101737, filed on Jul. 13, 2020.
Prior Publication US 2023/0147775 A1, May 11, 2023
Int. Cl. H02M 7/538 (2007.01); H02M 1/12 (2006.01); H02M 7/5387 (2007.01); H02M 7/5395 (2006.01)
CPC H02M 7/53873 (2013.01) [H02M 1/123 (2021.05); H02M 7/5395 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A common-mode voltage injection control method, wherein the common-mode voltage injection control method is applied to a three-phase three-level inverter, and the method comprises:
obtaining a direct current bus voltage and three-phase port voltages of the three-phase three-level inverter;
calculating a common-mode voltage for a discontinuous pulse-width modulation (DPWM) mode based on the three-phase port voltages and an output power command;
calculating a common-mode voltage for a model predictive control (MPC) modulation mode based on the direct current bus voltage, the three-phase port voltages, and the output power command;
determining a modulation proportion based on a maximum phase voltage peak value of the three-phase port voltages, the direct current bus voltage, and a power factor of the output power command; and
generating a common-mode injection voltage based on the common-mode voltage for the DPWM mode, the modulation proportion, and the common-mode voltage for the MPC modulation mode, wherein
the common-mode injection voltage is used to generate an output voltage modulation wave of the three-phase three-level inverter, the common-mode injection voltage comprises a first part and a second part, the first part of the common-mode injection voltage is the common-mode voltage for the DPWM mode, the second part of the common-mode injection voltage is the common-mode voltage for the MPC modulation mode, and a proportion of the first part of the common-mode injection voltage to the second part of the common-mode injection voltage is determined according to the modulation proportion.