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1. (WO2018098974) PULSE WIDTH MODULATION METHOD, PULSE WIDTH MODULATION SYSTEM, AND CONTROLLER

Pub. No.:    WO/2018/098974    International Application No.:    PCT/CN2017/081589
Publication Date: Fri Jun 08 01:59:59 CEST 2018 International Filing Date: Tue Apr 25 01:59:59 CEST 2017
IPC: H02M 7/00
H02M 1/12
Applicants: HUAWEI TECHNOLOGIES CO., LTD.
华为技术有限公司
Inventors: LIU, Fangcheng
刘方诚
XIN, Kai
辛凯
GUO, Haibin
郭海滨
Title: PULSE WIDTH MODULATION METHOD, PULSE WIDTH MODULATION SYSTEM, AND CONTROLLER
Abstract:
A pulse width modulation method, a pulse width modulation system, and a controller. The method comprises: obtaining modulation parameters of a three-phase inverter, the modulation parameters of the three-phase inverter comprising a degree of modulation and an operating parameter of the inverter, the operating parameter being used for indicating the operating state of the three-phase inverter (501); when the modulation parameters meet a continuous pulse width modulation (CPWM) condition, selecting CPWM as the modulation mode of the three-phase inverter (502); when the modulation parameters meet a discontinuous pulse width modulation (DPWM) condition, selecting DPWM as the modulation mode of the three-phase inverter (503); and when the modulation parameters do not meet the CPWM condition and do not meet the DPWM condition, selecting the modulation mode of the three-phase inverter during the previous control period as the modulation mode during the current control period (504), the modulation mode being CPWM or DPWM. By means of the method, a modulation mode is selected according to modulation parameters, so that a harmonic standard requirement is met while the normal operation of a three-phase inverter is ensured, and the stability of a three-phase inverter system is improved.