Title:
SEAMLESS SWITCHING METHOD AND SYSTEM FOR MICRO-GRID SYSTEM
Document Type and Number:
WIPO Patent Application WO/2015/096586
Kind Code:
A1
Abstract:
A seamless switching method and system for a micro-grid system. The method comprises: a first voltage collection module collecting values of various phase voltages at a grid side connected thereto; a PCS determining the power-loss ratio of the current voltage value of each phase voltage relative to a standard value, and counting the sum of the number of times of the power-loss ratios of various phase voltages being lower than a predetermined value; and if the PCS judges that the value of the sum is larger than a threshold value, executing V/F switching, and at the same time, triggering a PCC switch between the grid connected thereto and a micro-grid to be disconnected. By means of the manner of switching from on-grid to off-grid, the current impact is very small, and the smooth switching from on-grid to off-grid can be achieved.
Inventors:
LIU ZHIQIANG (CN)
ZHANG DONGSHENG (CN)
SU WEIFENG (CN)
WEI SANMIN (CN)
GOU RUIFENG (CN)
ZHANG DONGSHENG (CN)
SU WEIFENG (CN)
WEI SANMIN (CN)
GOU RUIFENG (CN)
Application Number:
PCT/CN2014/092365
Publication Date:
July 02, 2015
Filing Date:
November 27, 2014
Export Citation:
Assignee:
CHINA XD ELECTRIC CO LTD (CN)
International Classes:
H02J9/06; H02J3/00
Foreign References:
| CN103683283A | 2014-03-26 | |||
| CN103023132A | 2013-04-03 | |||
| CN102709946A | 2012-10-03 | |||
| US8269374B2 | 2012-09-18 |
Other References:
HUANG, XING ET AL.: "A Microgrid System Control Method with Fast Grid Connection Capability", JOURNAL OF BEIJING JIAOTONG UNIVERSITY, vol. 36, no. 5, 31 October 2012 (2012-10-31), pages 9 - 10
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW (CN)
北京集佳知识产权代理有限公司 (CN)
北京集佳知识产权代理有限公司 (CN)
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