Title:
CONTROL METHOD FOR SUPPRESSING OVERVOLTAGE UNDER FAULT OF RECEIVING-END POWER GRID OF HYBRID DIRECT-CURRENT POWER TRANSMISSION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2023/029813
Kind Code:
A1
Abstract:
Disclosed in the present invention is a control method for suppressing overvoltage of a receiving-end converter under a fault of a receiving-end power grid of a hybrid direct-current power transmission system. When a short-circuit fault occurs in a receiving-end alternating-current power grid of a hybrid direct-current power transmission system, the receiving-end alternating-current bus voltage drops, and an effective value of the alternating-current bus voltage at this time is measured; because a hybrid MMC has the capability of actively reducing the direct-current voltage to operate, while ensuring that the output current of a receiving-end MMC is always within a rated current range, the receiving-end power can be sent out by a control mode of setting a direct-current voltage reference value and making the same not higher than the effective value of the alternating-current bus voltage, thereby suppressing overvoltage of a receiving-end converter. According to the present invention, by actively reducing the direct-current voltage of the receiving end, energy absorption at the receiving end is reduced, and power surplus of the receiving-end system is avoided, thereby suppressing overvoltage of the receiving-end converter, and improving the operation reliability of the system; the present invention is suitable for long-distance large-capacity flexible direct-current transmission.
Inventors:
XU ZHENG (CN)
ZHANG NAN (CN)
ZHANG ZHEREN (CN)
ZHANG NAN (CN)
ZHANG ZHEREN (CN)
Application Number:
PCT/CN2022/107809
Publication Date:
March 09, 2023
Filing Date:
July 26, 2022
Export Citation:
Assignee:
UNIV ZHEJIANG (CN)
International Classes:
H02J3/00; H02H9/04; H02J3/36; H02M1/32; H02M7/483
Foreign References:
| CN113629708A | 2021-11-09 | |||
| CN103701145A | 2014-04-02 | |||
| CN105406499A | 2016-03-16 | |||
| CN105896585A | 2016-08-24 | |||
| US20180120367A1 | 2018-05-03 |
Other References:
XU, ZHENG; WANG, SHIJIA; ZHANG, ZHEREN; XU, YUZHE; XIAO, HUANGQING: "Inverter Station Connection Modes and Control Strategies of LCC-MMC Hybrid HVDC Systems", DIANLI JIANSHE = ELECTRIC POWER CONSTRUCTION, DIANLI JIANSHE ZAZHISHE, CN, vol. 39, no. 7, 1 July 2018 (2018-07-01), CN , pages 115 - 122, XP009544252, ISSN: 1000-7229
Attorney, Agent or Firm:
BEIJING FINELAND IP FIRM (CN)
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