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DC fault crossing method for hybrid multiterminal HVDC system

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

Active Publication Date: 2017-02-22
XUJI GRP +2
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  • Abstract
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  • 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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  • DC fault crossing method for hybrid multiterminal HVDC system
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  • DC fault crossing method for hybrid multiterminal HVDC 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

The invention relates to a DC fault crossing method for a hybrid multiterminal HVDC system. The hybrid multiterminal HVDC system comprises at least two LCC type converter stations and at least one FB-MMC type converter station, when a DC fault occurs, LCC type rectifiers are forced to realize phase shift to 120 degree, and a fault current is rapidly inhibited; after an FB-MMC type converter receives a fault signal, the FB-MMC type converter is switched to a DC current control mode, a DC current reference value is controlled for being zero, and a sub module constant volume voltage balance controller starts; after the fault signal disappears, a stable operation signal of the LCC type converters is waited for, when the stable signal is detected, the FB-MMC type converter is switched into an active power mode. The method is advantaged in that the FB-MMC type converter is prevented from blocking in a fault period, the fault current is not only inhibited, but also the reactive power can be normally compensated, and thereby the hybrid multiterminal HVDC system is enabled to rapidly recover into a normal operation state.

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...

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Application Information

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Patent Type & Authority Applications(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