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Small-interference stability optimization method and device for AC-DC hybrid system containing VSC-HVDC

A VSC-HVDC, AC-DC hybrid technology, which is applied in the field of small-disturbance stability optimization of AC-DC hybrid systems, can solve problems such as variable analysis that cannot be operated in the system, achieve accuracy improvement, improve small-disturbance stability, and adjust Intuitive effect of the method

Active Publication Date: 2019-07-19
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Application Information

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Problems solved by technology

Therefore, the system stability optimization method in the prior art only considers the state quantity of the flexible DC system, and cannot comprehensively analyze the variables that affect the system operation

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  • Small-interference stability optimization method and device for AC-DC hybrid system containing VSC-HVDC
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  • Small-interference stability optimization method and device for AC-DC hybrid system containing VSC-HVDC

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Embodiment Construction

[0063] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts all belong to the protection scope of the present invention.

[0064] see figure 1 , is a schematic flow chart of a small disturbance stability optimization method for an AC-DC hybrid system containing VSC-HVDC provided by an embodiment of the present invention, including:

[0065] S101. Modeling the AC and DC power system to obtain a system dynamic model;

[0066] S102. According to the system state matrix in the system dynamic model, the sensitivity of relevant parameters of the VSC-HVDC system under di...

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Abstract

The invention discloses a small-interference stability optimization method and device for an AC-DC hybrid system containing VSC-HVDC, and the method comprises the following steps: modeling an AC-DC power system to obtain a system dynamic model; acquiring related parameter sensitivity of a VSC-HVDC system under different DC transmission powers according to a system state matrix in the system dynamic model; determining whether the related parameter sensitivity of the VSC-HVDC system is a positive value or not: if yes, reducing the related parameter sensitivity of the VSC-HVDC system to increasethe oscillation damping ratio; if the related parameter sensitivity of the VSC-HVDC system is negative, increasing the related parameter sensitivity of the VSC-HVDC system to increase the oscillationdamping ratio, wherein the related parameters of the VSC-HVDC system include a converter station AD bus voltage of the VSC-HVDC system, converter station output reactive power of the VSC-HVDC system,and a converter station DC voltage of the VSC-HVDC system. According to the invention, the method can consider the influence of the state quantity of an Ac system in the AC-DC hybrid system on a flexible DC power transmission system, so that the accuracy of improving the small interference stability is improved.

Description

technical field [0001] The invention relates to the technical field of AC and DC power system optimization, in particular to a small disturbance stability optimization method and device for an AC-DC hybrid system containing VSC-HVDC. Background technique [0002] The scale of inter-regional grid interconnection continues to expand. While improving the economics of grid operation, it also increases the risk of low-frequency oscillations between local weak grids and the main grid, threatening the safe and stable operation of the grid. Compared with the traditional DC transmission technology, the flexible DC transmission technology (Voltage-Sourced Converter HVDC) does not have the lock-up of the converter valve caused by the commutation failure, making VSC-HVDC very suitable for supplying power to the weak AC system and becoming a substitute for the traditional AC connection line. A new option to connect the local weak grid and the main grid provides a new idea for improving t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 陈雁张东辉李鹏飞李霞林黄迪
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD