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A DC fault ride-through method for a hybrid multi-terminal HVDC transmission system

A DC fault ride-through and high-voltage DC technology, applied in the direction of power transmission AC network, etc., can solve the problem that the system cannot operate effectively and normally

Active Publication Date: 2020-04-10
XUJI GRP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a DC fault ride-through method for a hybrid multi-terminal high-voltage direct current transmission system, which is used to solve the problem that the system cannot effectively operate normally when a DC fault occurs in the multi-terminal hybrid high-voltage direct current transmission system

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  • A DC fault ride-through method for a hybrid multi-terminal HVDC transmission system
  • A DC fault ride-through method for a hybrid multi-terminal HVDC transmission system
  • A DC fault ride-through method for a hybrid multi-terminal HVDC transmission system

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Embodiment Construction

[0015] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0016] In this embodiment, a hybrid three-terminal HVDC power transmission system is proposed, and its topology is as follows figure 1 As shown, the system includes three converter stations, namely, converter station A, converter station B, and converter station C. The three converter stations are respectively connected to three AC systems, and the converter station B is connected to a weak AC grid system. The full-bridge modular multilevel converter (FB-MMC) is used in the converter station B connected to the weak AC grid, which is called the FB-MMC converter station. The phase converter (LCC) is called the LCC type converter station, the LCC type converter station is a large-capacity station, and the FB-MMC is a small-capacity station. The system is a branch structure, and the three converter stations are connected to the same DC transmi...

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Abstract

A direct-current fault ride-through method, wherein same is applied to a hybrid multi-terminal high-voltage direct-current transmission system. The hybrid multi-terminal high-voltage direct-current transmission system comprises at least two line commutated converter (LCC) type converter stations and at least one full-bridge modular multilevel converter (FB-MMC) type converter station. The method comprises: when a direct-current fault signal is detected, forcing an LCC type rectifier to perform a phase shift, so as to rapidly inhibit a fault current, with the LCC type rectifier being a converter in the LCC type converter stations for rectification; switching an FB-MMC type converter to a direct-current control mode, the FB-MMC type converter being a converter in the FB-MMC type converter station; after it is detected that the direct-current fault signal disappears, detecting a stable running signal of the LCC type rectifier; and after the stable running signal is detected, switching the FB-MMC type converter to be in an active power mode.

Description

technical field [0001] The invention belongs to the field of power electronics technology and direct current transmission, and in particular relates to a direct current fault ride-through method for a hybrid multi-terminal high-voltage direct current transmission system. Background technique [0002] At present, HVDC transmission systems generally use two-end topology, that is, a rectifier station and an inverter station, which are respectively connected to two AC power grids. However, in many occasions, it is more suitable to adopt the multi-terminal HVDC transmission system structure, such as: transmitting a large amount of power from the energy base to several load centers in the distance, connecting the middle branch of the DC transmission line to the load or power supply, and implementing several isolated AC systems with DC lines Asynchronous contact. With the improvement of DC transmission reliability and cost reduction, as well as the development of DC circuit breake...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 彭忠李少华李泰荆雪记苏匀周金萍赵静苏进国胡永昌李艳梅徐留杰陈晓民
Owner XUJI GRP