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Power coordinated control method and device for LCC-VSC direct current transmission system

A technology of LCC-VSC, DC transmission system, applied in the field of power coordination control, can solve the problem of inability to quickly stabilize the active power of LCC-VSC DC transmission system, and achieve the effect of avoiding active power fluctuation and active power stability

Active Publication Date: 2019-10-22
XJ ELECTRIC +1
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Problems solved by technology

[0006] The purpose of the present invention is to provide a power coordination control method and device of an LCC-VSC direct current transmission system, which is used to solve the problem of the existing power coordination control method when one pole of the VSC end converter station in the DC voltage control mode is out of operation. The problem of not being able to quickly stabilize the active power of the entire hybrid multi-terminal LCC-VSC DC transmission system

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  • Power coordinated control method and device for LCC-VSC direct current transmission system

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Embodiment Construction

[0048] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0049] figure 1 In the shown hybrid three-terminal LCC-VSC DC transmission system, the control functions of the converter stations at each terminal are arranged in layers, including a DC station control system, a pole-1 pole control system and a pole-2 pole control system. Converter station A includes station A pole 1 control system, station A pole 2 pole control system and station A DC station control system, and converter station B includes station B pole 1 pole control system, station B pole 2 pole control system and station B DC station control system, converter station C includes station C pole 1 pole control system, station C pole 2 pole control system and station C DC station control system. Optical fiber communication is used between the DC station control systems at each end, and optical fiber communication is used between the DC s...

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Abstract

The invention relates to a power coordinated control method and device for an LCC-VSC direct current transmission system, and belongs to the technical field of direct current transmission. The methodcomprises the steps that the first pole of a VSC end converter station in an active power control mode is switched into a direct-current voltage control mode, and when the second pole of the VSC end converter station is in the active power control mode is in a bipolar active power control mode, an active power reference value is adjusted according to the bipolar active power control mode; when thesecond pole of the VSC end converter station is in a unipolar active power control mode, the active power reference value is unchanged; when the control mode of an LCC end converter station is a bipolar active power control mode, the active power reference value of each pole is adjusted according to the bipolar active power control mode; and when the control mode of the LCC end converter stationis a unipolar active power control mode, the active power reference value is unchanged. According to the invention, the active power of the LCC-VSC direct current transmission system is stable when one pole of the VSC end converter station in the direct-current voltage control mode is stopped, and the problem of active power fluctuation is avoided.

Description

technical field [0001] The invention belongs to the technical field of direct current transmission, and in particular relates to a power coordination control method and device of an LCC-VSC direct current transmission system. Background technique [0002] At present, the traditional direct current transmission technology (LCC-HVDC) is the most mainstream and mature technology of direct current transmission, which has the advantages of large transmission capacity, good operation stability, small system loss, and low construction cost. has an irreplaceable role. The flexible direct current transmission technology (VSC-HVDC) based on the voltage source converter provides a new development direction for the direct current transmission technology, which can be connected to the passive network, because it does not have the problem of commutation failure, and the voltage harmonic content The output frequency and voltage are stable, the active power and reactive power can be adjust...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J13/00
CPCH02J3/36H02J13/00019Y02E60/60
Inventor 宋延涛许梦阳刘旭辉吴庆范刘志军李乾岳笑歌曹森郝俊芳范雪峰孔令凯涂仁川王胜吴东崛王秋开田培涛李亚峰刘晨王长久张绍军许朋见范子强罗磊卢麒
Owner XJ ELECTRIC
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