Title:
PWM CONTROL SIGNAL SYNCHRONIZATION METHOD FOR INVERTER, INVERTER, AND POWER GRID SYSTEM
Document Type and Number:
WIPO Patent Application WO/2019/061186
Kind Code:
A1
Abstract:
A PWM control signal synchronization method for an inverter, an inverter, and a power grid system, configured to enable PWM control signal synchronization for an inverter connected to a power grid. A direct current voltage end of an inverter is connected to an external power supply. An alternating current voltage end of the inverter is connected to an alternating current point of common coupling of a power grid. The method comprises: acquiring a phase θ of an alternating current voltage of the power grid (S101); upon detecting the phase of the alternating current voltage has reached a phase threshold, determining a time period during which the phase of the alternating current voltage varies within a predetermined phase threshold interval (S102), wherein the phase threshold is a start value of the predetermined phase threshold interval; calculating, according to a predetermined carrier ratio and the time period, a period of a predetermined carrier wave (S103); generating the predetermined carrier wave according to the period thereof (S104); and generating a PWM control signal of the inverter according to a PWM modulation signal and the predetermined carrier wave.
Inventors:
YUAN HONGWEN (CN)
XU FUQIANG (CN)
LIU FANGCHENG (CN)
XU FUQIANG (CN)
LIU FANGCHENG (CN)
Application Number:
PCT/CN2017/104067
Publication Date:
April 04, 2019
Filing Date:
September 28, 2017
Export Citation:
Assignee:
HUAWEI TECH CO LTD (CN)
International Classes:
H02J3/38
Foreign References:
| CN106981883A | 2017-07-25 | |||
| CN104901333A | 2015-09-09 | |||
| CN106849721A | 2017-06-13 | |||
| CN104953878A | 2015-09-30 | |||
| CN104682429A | 2015-06-03 | |||
| EP1251632A2 | 2002-10-23 | |||
| US20150357822A1 | 2015-12-10 |
Other References:
See also references of EP 3681007A4
Attorney, Agent or Firm:
BEIJING ZBSD PATENT&TRADEMARK AGENT LTD. (CN)
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