AC-DC fault combined ride-through method suitable for cascaded hybrid direct current

A hybrid DC, AC and DC technology, applied in the direction of power transmission and AC network to achieve the effect of improving the reactive power support capacity

Inactive Publication Date: 2021-07-23
JIANGSU ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another example is the DC fault restoration control strategy of the hybrid cascaded HVDC transmission system (References: Yang Shuo, Zheng Anran, Peng Yi, Guo Chunyi, Zhao Chengyong. DC fault characteristics and restoration control strategy of the hybrid cascaded HVDC transmission system[J]. Electric Power Automation Equipment, 2019, 39(09): 166-172+179.), which proposes a recovery control strategy for hybrid cascaded DC transmission systems during DC faults and after fault clearing, which alleviates the overcurrent phenomenon during faults , but this control strategy is only for DC fault
In addition, the coordination strategy of hybrid cascaded HVDC transmission, (references: Zeng Rui, Li Baohong, Liu Tianqi, Yan Heming, Mi Zhiwei. Coordinated control strategy for multi-point cascaded hybrid HVDC transmission system at the receiving end[J]. Electric power automation equipment ,2021,41(02):111-117.), which proposes a coordination strategy for master-slave control hybrid cascaded DC transmission, but the related method needs to design more additional control functions, which is only applicable to the master-slave control mode

Method used

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  • AC-DC fault combined ride-through method suitable for cascaded hybrid direct current
  • AC-DC fault combined ride-through method suitable for cascaded hybrid direct current
  • AC-DC fault combined ride-through method suitable for cascaded hybrid direct current

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Embodiment

[0039] by figure 1 The receiving-end cascaded hybrid HVDC power transmission system shown is taken as an example for verification, in which the rated voltage and power of the high-end LCC converter on the inverter side are 400kV and 2000MW respectively, and the rated voltage and power of the three low-end VSC converters are respectively 400kV and 667MW, the control method is shown in Table 1. The LCC converter station on the inverter side is connected in series with the VSC converter station to form a total rated hybrid DC voltage of 800kV and share the power delivered by the LCC station at the sending end. On the other hand, the inverter station at the receiving end is fed into different locations of the 500kV AC system.

[0040] Table 1 Active power control mode of MMC converter station

[0041]

[0042] Verification scheme 1: Verification of faults on the AC side of the dynamic limiter control strategy.

[0043]In order to verify the reactive power support capability ...

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Abstract

The invention discloses an AC-DC fault joint ride-through method suitable for a cascaded hybrid direct current. A master-slave control mode is adopted, and two dynamic amplitude limiting links are additionally disposed at an MMC2 converter station and an MMC3 converter station which are controlled by flexible DC constant power on an inversion side, thereby multiplying the reactive power support capability for AC faults. Meanwhile, one-way conducting diodes are arranged at the outlets of the DC side lines of the MMC1, the MMC2 and the MMC3. On one hand, the MMC inverters can be completely prevented from being converted into rectifiers; and on the other hand, when there is a single-pole grounding fault on the DC side, the MMCs are prevented from discharging to a fault point, so that the hybrid direct current has the DC side fault ride-through capacity.

Description

technical field [0001] The invention relates to the technical field of hybrid direct current transmission, in particular to an AC / DC fault combined ride-through method suitable for cascaded hybrid direct current. Background technique [0002] Hybrid DC transmission has become an important development direction of DC transmission technology in recent years because it combines the advantages of conventional DC (LCC-HVDC) and flexible DC (VSC-HVDC). Receiver cascaded hybrid DC power transmission (such as figure 1 ) rectifier station consists of two sets of 12-pulse LCCs in series, and the inverter station consists of a set of 12-pulse commutation converters (LCCs) and voltage source converters (VSCs) connected in series in parallel, and the low-end VSC is extended to Multiple VSCs are connected in parallel and placed on different regional power grids. While increasing the transmission power of the hybrid DC system, the multi-location structure is also conducive to the phased c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 赵静波朱宇萌周前岑炳成曾蕊李保宏江琴
Owner JIANGSU ELECTRIC POWER RES INST
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