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Small disturbance stability optimization method and device for AC-DC hybrid system with 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: 2021-09-03
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology

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

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  • Small disturbance stability optimization method and device for AC-DC hybrid system with vsc-hvdc
  • Small disturbance stability optimization method and device for AC-DC hybrid system with vsc-hvdc
  • Small disturbance stability optimization method and device for AC-DC hybrid system with vsc-hvdc

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Embodiment Construction

[0063] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0064] see figure 1 , is a schematic flowchart 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, obtain the sensitivity of relevant parameters of the VSC-HVDC system under different DC tran...

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Abstract

The invention discloses a small-disturbance stability optimization method for an AC-DC hybrid system containing VSC‑HVDC, comprising the following steps: modeling the AC-DC power system to obtain a system dynamic model; according to the system state matrix in the system dynamic model , to get the sensitivity of related parameters of the VSC‑HVDC system under different DC transmission powers; judge whether the sensitivity of related parameters of the VSC‑HVDC system is a positive value, if so, reduce the related parameters of the VSC‑HVDC system to increase the oscillation damping ratio; if VSC‑HVDC The sensitivity of related parameters of the HVDC system is negative. Increase the related parameters of the VSC‑HVDC system to increase the oscillation damping ratio; among them, the related parameters of the VSC‑HVDC system include the AC bus voltage of the VSC‑HVDC system converter station, the VSC‑HVDC system The converter station outputs reactive power and DC voltage of the VSC‑HVDC system converter station. The small-disturbance stability optimization method of the AC-DC hybrid system containing VSC‑HVDC disclosed by the present invention can take into account the influence of the state quantity of the AC system in the AC-DC hybrid system on the flexible DC transmission system, thereby improving the small-disturbance stability The accuracy 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 including a 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(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
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