Title:
PULSE WIDTH MODULATION METHOD, PULSE WIDTH MODULATION SYSTEM, AND CONTROLLER
Document Type and Number:
WIPO Patent Application WO/2018/098975
Kind Code:
A1
Abstract:
A pulse width modulation method, a pulse width modulation system, and a controller. According to the present application, the rate of change of a common-mode component of a three-phase inverter is changed as the degree of modulation of the inverter is changed, so that the stability and harmonic characteristics of the three-phase inverter are improved, and flexible adaptive adjustment is implemented. The pulse width modulation method comprises: obtaining an initial three-phase modulation wave and a degree of modulation of an inverter (601); calculating an adjustment coefficient of the rate of change of a common-mode component according to preset modulation parameters and the degree of modulation of the inverter; calculating a modulation wave set corresponding to the initial three-phase modulation wave according to a preset maximum modulation wave amplitude limiting value, a minimum modulation wave amplitude limiting value, the initial three-phase modulation wave, and the adjustment coefficient of the rate of change of the common-mode component, and selecting, from the modulation wave set, a modulation wave with a minimum absolute value as a common-mode modulation wave (603); and performing waveform superimposition on the initial three-phase modulation wave and the common-mode modulation wave to obtain a three-phase output modulation wave.
Inventors:
LIU FANGCHENG (CN)
XIN KAI (CN)
GUO HAIBIN (CN)
XIN KAI (CN)
GUO HAIBIN (CN)
Application Number:
PCT/CN2017/081600
Publication Date:
June 07, 2018
Filing Date:
April 24, 2017
Export Citation:
Assignee:
HUAWEI TECH CO LTD (CN)
International Classes:
H02M7/537; H02M1/12
Foreign References:
| CN103051227A | 2013-04-17 | |||
| CN106100430A | 2016-11-09 | |||
| CN104753375A | 2015-07-01 | |||
| US7400518B2 | 2008-07-15 | |||
| JP5830298B2 | 2015-12-09 | |||
| CN201611080630A | 2016-11-30 |
Other References:
See also references of EP 3537589A4
Attorney, Agent or Firm:
SHENPAT INTELLECTUAL PROPERTY AGENCY (CN)
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