MULTI-INFEED SYSTEM COMMUTATION FAILURE PREVENTION COORDINATED CONTROL METHOD TAKING COMMUTATION MARGIN INTO CONSIDERATION

WIPO Patent Application WO/2024/027088

A1

Disclosed in the present invention is a multi-infeed system commutation failure prevention (CFPREV) coordinated control method taking a commutation margin into consideration. The method comprises the following steps: step (1) performing asymmetric fault detection and symmetric fault detection on an inverter side, and implementing CFPREV control starting output according to the amplitude of a detection voltage; step (2) measuring an extinction angle value of each direct-current system, performing per-unit processing, and dividing the minimum extinction angle by the maximum extinction angle, so as to obtain a conversion coefficient; and step (3) selecting the current direct-current system having the maximum current extinction angle value for coordinated control, and multiplying an output proportional coefficient of the direct-current system by the conversion coefficient, so as to realize coordinated output of CFPREV control. The present invention ensures a successive commutation failure inhibition effect of a direct current having a relatively high risk of commutation failure, and can effectively inhibit successive commutation failure of a multi-infeed direct-current system.

TANG YI (CN)
DAI JIANFENG (CN)
GU RUI (CN)
QIAN JUNLIANG (CN)
ZHOU JI (CN)
HAO SHANSHAN (CN)

PCT/CN2022/142192

February 08, 2024

December 27, 2022

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LIYANG RESEARCH INSTITUTE OF SOUTHEAST UNIV (CN)

H02J3/00

CN113300360A	2021-08-24
CN115000960A	2022-09-02
CN113078672A	2021-07-06
JP2012120285A	2012-06-21

NANJING XINZHIHANG INTELLECTUAL PROPERTY AGENCY (SPECIAL GENERAL PARTNERSHIP) (CN)

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