Title:
RECEIVING END ALTERNATING-CURRENT FAULT RIDE-THROUGH CONTROL METHOD FOR HYBRID CASCADED DIRECT-CURRENT POWER TRANSMISSION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2023/201922
Kind Code:
A1
Abstract:
Disclosed in the present invention is a receiving end alternating-current fault ride-through control method for a hybrid cascaded direct-current power transmission system. That is, a rectification-side LCC determines, according to a change in the electrical quantity of a direct-current port of the rectification-side LCC, that a receiving-end alternating-current fault has occurred, and a rectification-side direct-current voltage is rapidly reduced by means of increasing a trigger angle, thereby achieving the effect of rapidly suppressing an overcurrent; and an inversion-side MMC controlled using a fixed active power transmits an active power as much as possible by means of correcting an active power instruction value of an outer ring of the MMC, such that the surplus power of a receiving-end system is reduced, and the overvoltage of an MMC sub-module capacitor is suppressed. By means of the method in the present invention, suppression measures for overcurrent and overvoltage during a receiving-end power grid fault of a hybrid cascaded direct-current power transmission system are provided from the aspect of control, thereby realizing fault ride-through; the method has a good fault recovery process; in addition, by means of the method in the present invention, the energy absorption of a lightning arrester can be reduced, thereby providing a safeguard for the safe and stable operation of the direct-current system.
Inventors:
XU ZHENG (CN)
ZHANG NAN (CN)
ZHANG ZHEREN (CN)
ZHANG NAN (CN)
ZHANG ZHEREN (CN)
Application Number:
PCT/CN2022/107777
Publication Date:
October 26, 2023
Filing Date:
July 26, 2022
Export Citation:
Assignee:
UNIV ZHEJIANG (CN)
International Classes:
H02M1/32; H02J3/36; H02M7/04; H02M7/483
Domestic Patent References:
| WO2018052067A1 | 2018-03-22 |
Foreign References:
| CN111769583A | 2020-10-13 | |||
| CN108988373A | 2018-12-11 | |||
| CN108321829A | 2018-07-24 | |||
| CN110492519A | 2019-11-22 | |||
| CN112952886A | 2021-06-11 | |||
| JP2017011916A | 2017-01-12 |
Attorney, Agent or Firm:
BEIJING FINELAND IP FIRM (CN)
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