Title:
MICROGRID SYSTEM AND METHOD OF CONTROLLING SAME
Document Type and Number:
WIPO Patent Application WO/2017/133269
Kind Code:
A1
Abstract:
A microgrid system and method of controlling same, the microgrid system comprising a storage battery (5000), an energy storage converter (1000), a monitoring circuit and a controllable switch (2000). When the microgrid system is in grid-connected mode, the energy storage converter outputs steady power under the control of an inner current loop unit (1220); in grid-connected mode, an outer voltage loop unit (1240) does not participate in control, but remains in an operating state, and on the basis of four outer voltage loop unit input signals, estimates in advance a specified current loop signal (uvo) for handover from grid-connected mode to island mode. When the microgrid system hands over from grid-connected mode to island mode, the outer voltage loop unit goes into operation, and the inner current loop unit controls a steady output voltage and frequency from the energy storage converter according to the pre-estimated specified current loop signal output by the outer voltage loop unit. The outer voltage loop unit controls the outputted specified current loop signal to be identical before and after mode handover, and can realize seamless handover between grid-connected and island modes for the microgrid system.
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Inventors:
ZHANG TAO (CN)
YU WEI (CN)
XU HAIBO (CN)
SU JIANHUI (CN)
YU WEI (CN)
XU HAIBO (CN)
SU JIANHUI (CN)
Application Number:
PCT/CN2016/101491
Publication Date:
August 10, 2017
Filing Date:
October 08, 2016
Export Citation:
Assignee:
EAST GROUP CO LTD (CN)
International Classes:
H02J3/38
Foreign References:
| CN105552962A | 2016-05-04 | |||
| CN205429759U | 2016-08-03 | |||
| CN104734193A | 2015-06-24 | |||
| CN104600748A | 2015-05-06 | |||
| US20140192567A1 | 2014-07-10 | |||
| JP2015133785A | 2015-07-23 |
Attorney, Agent or Firm:
ADVANCE CHINA IP LAW OFFICE (CN)
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