METHOD FOR ONLINE ADAPTIVE SUPPRESSION OF HIGH-FREQUENCY OSCILLATION CAUSED BY FLEXIBLE DIRECT CURRENT

WIPO Patent Application WO/2019/140584

A1

A method for online adaptive suppression of high-frequency oscillation caused by a flexible direct current, comprising: installing a plurality of notch filters having characteristic frequencies capable of being adjusted online in series in an MMC-HVDC control system, performing notch filtering after a local commutation bus voltage is subjected to Parker transformation, setting a frequency range threshold and a harmonic amplitude threshold, performing FFT transformation on the voltage signal of the commutation bus to obtain the amplitude of each harmonic, and detecting the maximum value and corresponding frequency of the amplitude in the harmonics having a frequency greater than the frequency range threshold; when the operating mode of an alternating current power grid changes and causes significant high-frequency oscillation between the alternating current and direct current systems, the notch filter that suppresses the frequency harmonic is input, and the input state is locked. The present method can reduce the high-frequency harmonic amplitude to below the harmonic amplitude threshold in a short time, and the direct current voltage and direct current power are also restored to the setting values, thereby effectively suppressing the problem of high-frequency oscillation caused by MMC-HVDC systems, and improving the dynamic response of the system.

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LIU CHONGRU (CN)
XIE GUOCHAO (CN)
WANG YU (CN)
KONG WEI (CN)
WANG JIECONG (CN)
LING BOWEN (CN)
LIU HAOYU (CN)
XU SHITIAN (CN)
YU JIANYU (CN)

PCT/CN2018/073176

July 25, 2019

January 18, 2018

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UNIV NORTH CHINA ELECTRIC POWER (CN)

H02J3/24

CN104934991A	2015-09-23
US6388517B1	2002-05-14
CN102799125A	2012-11-28
US20170025978A1	2017-01-26

See also references of EP 3624291A4

BEIJING ZHCC INTELLECTUAL PROPERTY CO., LTD (CN)

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