Method and system for determining influence factors of cascading failure of AC-DC power grid
A technique of influencing factors, cascading failures, applied in the direction of a single AC network with different frequencies, etc.
Active Publication Date: 2019-12-10
CHINA ELECTRIC POWER RES INST +1
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[0004] The present invention proposes a method and system for determining the influencing factors of cascading failures in AC and DC power grids to solve the problem of how to determine the influencing factors of cascading failures in AC and DC power grids to reduce the risk of cascading failures in the power grid
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[0061] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.
[0062] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or over...
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The invention discloses a method and a system for determining the influence factors of cascading failure of an AC-DC power grid. The method comprises the following steps as follows: determining a typical failure subset, causing cascading failure of an AC-DC power grid, of each line; calculating a power flow entropy, a machine-end frequency offset entropy and a machine-end voltage offset entropy corresponding to each typical fault in the typical fault subset of each line; and comparing the entropies with a preset critical entropy vector to determine the influence factors causing cascading failure of the AC-DC power grid when a certain typical failure occurs in each line. According to the invention, a technical means is provided for quantitative analysis and evaluation of influence factors of cascading failure after large-scale new energy grid connection, a judgment method capable of reflecting the reason and development process of the cascading failure of the power grid is formed, and the judgment method can be applied to the formulation of stability control measures for preventing cascading failure and has great significance for ensuring normal operation of the power grid after anintermittent new energy power supply is accessed on a large scale.
Description
technical field [0001] The present invention relates to the technical field of power system security and stability, and more specifically, relates to a method and system for determining the influencing factors of cascading faults in AC and DC power grids. Background technique [0002] In recent years, my country's new energy power generation technology based on wind power and photovoltaics has developed rapidly. With the increase in the installed capacity of new energy and the increase of DC transmission projects in the grid, a large number of electronic equipment replaces the electromagnetic conversion equipment of the traditional power system. , leading to major changes in the energy structure and power system in some areas rich in clean energy. Under the new power grid form, the cascading failure mode and evolution process of the system will become more complex and changeable, which will inevitably affect the security of the power grid. Stable operation brings new challenge...
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Login to View More IPC IPC(8): H02J3/02
CPCH02J3/02
Inventor 王震宇焦瑞浩王克非丁剑阴宏民唐晓骏侯凯元张鑫夏德明宋云亭尹路
Owner CHINA ELECTRIC POWER RES INST