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Title:
STABILITY INSPECTING METHOD FOR TYING INVERTER TO GRID, AND INVERTER
Document Type and Number:
WIPO Patent Application WO/2017/000740
Kind Code:
A1
Abstract:
Provided are a stability inspecting method for tying an inverter to a grid, and inverter. The method comprises: inputting, by an inverter, a first sequence of disturbing currents to a power grid, and detecting, while inputting the first sequence of disturbing currents, a line voltage and a current of an alternating current (AC) port, so as to obtain a first set of line voltage values (vab 1, vbc 1, vca 1) and a first set of current values (ia 1, ib 1, ic 1); inputting a second sequence of disturbing currents to the power grid, and detecting, while inputting the second sequence of disturbing currents to the power grid, the line voltage and the current of the AC port, so as to obtain a second set of line voltage values (vab 2, vbc 2, vca 2) and a second set of current values (ia 2, ib 2, ic 2); obtaining an equivalent impedance matrix of the power grid according to the first set of line voltage values, the first set of current values, the second set of line voltage values and the second set of current values; and determining whether a stability requirement of the inverter has been met according to an equivalent admittance matrix of the inverter and the equivalent impedance matrix of the power grid. The method can determine an influence of a power grid on an inverter using a reduced measurement cost.

Inventors:
LIU, Fangcheng (Huawei Administration Building, Bantian Longgang Distric, Shenzhen Guangdong 9, 518129, CN)
XIN, Kai (Huawei Administration Building, Bantian Longgang Distric, Shenzhen Guangdong 9, 518129, CN)
Application Number:
CN2016/084340
Publication Date:
January 05, 2017
Filing Date:
June 01, 2016
Export Citation:
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Assignee:
HUAWEI TECHNOLOGIES CO., LTD. (Huawei Administration Building, Bantian Longgang Distric, Shenzhen Guangdong 9, 518129, CN)
International Classes:
H02J3/38
Foreign References:
CN103595065A2014-02-19
CN102142690A2011-08-03
CN104638678A2015-05-20
JP2013116019A2013-06-10
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