Comprehensive evaluation method for reactive power reserves of electric power system based on eigenvalue analysis

Abstract

The invention discloses a method for evaluating reactive power reserves of an electric power system from the point of view of steady-state voltage stability, and belongs to the technical field of electric power system dispatching and operating. The method disclosed by the invention aims at carrying out eigenvalue analysis on a flow Jacobian matrix for steady-state voltage stability analysis, an eigenvalue whose ratio with the minimum eigenvalue is small is taken as a key eigenvalue, the comprehensive influence degree of node reactive power reserves for the steady-state voltage stability is reflected by the comprehensive sensitivity of node reactive injection for all of the eigenvalues, a low-voltage safe and stable reactive power reserve is differentiated from a high-voltage safe and stable reactive power reserve, and the sum of static reactive power reserves and the sum of dynamic reactive power reserves of each node which takes the comprehensive sensitivity as a weight are further weighted and accumulated, thereby acting as a low-voltage safe and stable reactive power reserve comprehensive index and a high-voltage safe and stable reactive power reserve comprehensive index. The comprehensive evaluation method provides a technical means for monitoring variations in reactive power reserves of the electric power system and comparing the effective degrees of the reactive power reserves under different operating modes by the dispatching and operating personnel.

Description

technical field [0001] The invention belongs to the technical field of power system dispatching operation, and more precisely, the invention relates to a method suitable for comprehensively evaluating reactive power reserve of a power system under a certain operation mode. Background technique [0002] The safe operation of the power system needs to consider the ability to withstand fluctuations in load and new energy generation. Usually, it is clearly required in the technical guidelines or regulations for power system operation that there must be a certain proportion of active power spinning reserve in the operation of the power system, generally not more than 2%~ 5% of the actual load determines the active power spinning reserve, but the reactive power reserve (standby) is only required, but there is no clear definition and calculation method. Existing methods for calculating reactive power reserve are all realized by calculating the Q-V curve based on the continuous powe...

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Problems solved by technology

However, how to use these eigenvalues ​​to reflect the comprehensive impact of nodal reactive power injection on the static voltage stability of the power system under the grid operation mode, so as to achieve a comprehensive evaluation of the effectiveness of nodal reactive power backup in maintaining voltage control capabilities, and then evaluate The overall level of power system reactive power reserve, there is still no relevant solution

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