Title:
POWER SUPPLY SYSTEM AND POWER SUPPLY METHOD
Document Type and Number:
WIPO Patent Application WO/2017/025022
Kind Code:
A1
Abstract:
A low voltage ride-through control system and method for multiple grid-connected power converter, comprising a photovoltaic array (11) and an inverter (12). The inverter comprises a DC/DC conversion unit (13) and a DC/AC inversion unit (14) connected to an output end of the DC/DC conversion unit. An input end of the DC/DC conversion unit is connected to an output end of the photovoltaic array. The inverter is connected to grids at a grid-connecting point. The inverter further comprises a low voltage ride-through detection unit (15) and a low voltage ride-through control unit (16). The low voltage ride-through detection unit is used for detecting the amplitude of a grid voltage at the grid-connecting point, so as to determine whether to trigger low voltage ride-through. In the case of determining to trigger low voltage ride-through, the low voltage ride-through control unit is used for reducing an input voltage of the DC/DC conversion unit, so as to reduce the output voltage of the photovoltaic array, so that the output voltage of the photovoltaic array is less than the voltage tracked at a maximum power point during the steady-state operation of the inverter. The system and method can effectively reduce the capacitance value of a bus and increase the stability of low voltage ride-through.
Inventors:
XIN KAI (CN)
GUO HAIBIN (CN)
GAO YONGBING (CN)
GUO HAIBIN (CN)
GAO YONGBING (CN)
Application Number:
PCT/CN2016/094228
Publication Date:
February 16, 2017
Filing Date:
August 09, 2016
Export Citation:
Assignee:
HUAWEI TECH CO LTD (CN)
International Classes:
H02J3/38
Foreign References:
| CN105098832A | 2015-11-25 | |||
| CN102738827A | 2012-10-17 | |||
| CN102857089A | 2013-01-02 |
Other References:
See also references of EP 3324509A4
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