Emergency load shedding control method based on trace sensitivity

Abstract

The present invention discloses an emergency load shedding control method based on trace sensitivity. The method comprises obtaining traces of post-accident state variables through power system transient numerical simulation, so as to solve transient security and stability allowance indicator vectors, and judging if solving emergency load shedding measures need to be carried out through transient security and stability constraint conditions; solving a trace sensitivity matrix of transient security and stability allowance indicators through power system transient numerical simulation and a numerical perturbation method, and linearizing the transient security and stability constraint conditions. The transient security and stability, including transient power angle stability, transient frequency security and transient voltage security of a post-accident system may be ensured, the load shedding cost is reduced, and economical efficiency of the measures is raised. Through trace sensitivity, the transient security and stability conditions are linearized, the original problem is converted into a linear programming problem, iteration solving is realized, and the rate of convergence is fast.

Description

technical field [0001] The invention relates to an emergency load shedding control method based on trajectory sensitivity. Background technique [0002] With the increase of power demand, in order to meet the power demand, the large-capacity power supply of the power system is gradually increasing, such as the construction of large-capacity thermal power units, the connection of UHV AC and DC, etc., when formulating emergency load shedding control measures for the power system, it is necessary to consider Bulk power supply shortage incidents due to these bulk power supplies being taken out of service. [0003] Large-capacity power supply shortage accidents are extreme accidents that will seriously deteriorate the transient safety and stability of the system in a short period of time. Transient security stability includes three aspects: transient power angle stability, transient frequency security and transient voltage security. When such extreme accidents occur, due to the...

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Problems solved by technology

[0005] In order to solve the above problems, the present invention proposes an emergency load shedding control method based on trajectory sensitivity. This method effectively solves the problem that traditional emergency load shedding control measures prevent large-capacity power supply shortage accidents. Considering the problem of ensuring the transient power angle stability, transient frequency security and transient voltage security of the system at the same time, based on the trajectory sensitivity, on the premise of ensuring the transient security and stability of the power system, formulate the minimum load shedding cost Control measures to improve the economy of measures

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