Title:
PWM METHOD, MODULATOR AND SYSTEM FOR THREE-LEVEL RECTIFIER SUPPRESSING COMMON MODE VOLTAGE
Document Type and Number:
WIPO Patent Application WO/2020/082762
Kind Code:
A1
Abstract:
Disclosed in the present invention are a PWM method, a modulator and a system for a three-level rectifier suppressing a common mode voltage. The PWM method for suppressing a common mode voltage is applicable to an NPC three-level PWM rectifier, and comprises: sector determination: determining a sector number according to the phase angle of a reference voltage vector; basic vector selection: selecting two medium vectors and one zero vector according to the sector where a reference voltage vector is located, and then selecting a P-type or N-type small vector according to a difference value between two capacitance voltages on a direct current side; basic vector action time calculation: writing a voltage-second balance equation according to the selected basic vectors, and solving the voltage-second balance equation so as to obtain the action time of each basic vector; switch sequence design; and PWM driving signal generation: generating a corresponding PWM driving signal according to the switch sequence, and controlling the turning on and off of a power switch transistor. Said invention achieves the purpose of suppressing the magnitude and frequency of the common mode voltage.
Inventors:
ZHANG CHENGHUI (CN)
XING XIANGYANG (CN)
QIN CHANGWEI (CN)
LI XIAOYAN (CN)
XING XIANGYANG (CN)
QIN CHANGWEI (CN)
LI XIAOYAN (CN)
Application Number:
PCT/CN2019/091776
Publication Date:
April 30, 2020
Filing Date:
June 18, 2019
Export Citation:
Assignee:
UNIV SHANDONG (CN)
International Classes:
H02M7/219; H02J3/24; H02J3/38; H02M1/44; H02M7/53
Foreign References:
| CN109217701A | 2019-01-15 | |||
| CN103731055A | 2014-04-16 | |||
| CN106712564A | 2017-05-24 | |||
| CN108574403A | 2018-09-25 |
Attorney, Agent or Firm:
JINAN SHENGDA INTELLECTUAL PROPERTY AGENCY CO., LTD. (CN)
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