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Power reversing method for hybrid three-terminal high-voltage direct-current transmission system

A technology for high-voltage direct current and power transmission systems, which is applied in the direction of power transmission and AC networks, and can solve the problem that the three-terminal high-voltage direct current transmission system cannot realize on-line power reversal.

Active Publication Date: 2016-12-07
XUJI GRP +2
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a power inversion method for a hybrid three-terminal high-voltage direct current transmission system, which is used to solve the problem that the three-terminal high-voltage direct current transmission system cannot realize online power inversion

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Embodiment Construction

[0018] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0019] The present invention provides a hybrid three-terminal HVDC power transmission system, the topology of which 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. Three converter stations are connected to the same DC transmissio...

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Abstract

The invention relates to a power reversing method for a hybrid three-terminal high-voltage direct-current transmission system. The hybrid three-terminal high-voltage direct-current transmission system comprises two LCC-type converter stations A and C and an FB-MMC converter station B. After the rectification converter station A receives a reversing command, the direct current is dropped, the rectification state is reset, a reset signal is sent to the inversion converter station C, the direct voltage of the converter station C is dropped, the inversion state is reset, and a rectification signal is set; after the converter station B receives a power reversing command, the active power parameter value is lowered, the mode is switched to a direct current control mode, after the converter stations A and C complete power reversing, the mode of the converter station B is switched into an active power mode, and the active power reference value is controlled to be increased. Through the power reversing method, the current and voltage polarity can be smoothly changed, online power reversing of the hybrid three-terminal direct-current transmission system is completed, and stable and safe operation of the system is guaranteed.

Description

technical field [0001] The invention belongs to the field of power electronics technology and direct current transmission, and in particular relates to a power inversion method for a hybrid three-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 breaker manufacturing te...

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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陈晓民苏进国胡永昌李艳梅徐留杰刘涛
Owner XUJI GRP
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