Critical cluster identifying method for transient stability analysis of power system

A technology of transient stability analysis and power system, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve problems such as failure to find out the influence of system transient stability, misjudgment, lack of theoretical basis, etc., to improve control The effect of technical level, reduction of misjudgment, and improvement of recognition accuracy

Active Publication Date: 2014-06-04
NORTHEAST CHINA GRID +1
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  • Claims
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Problems solved by technology

However, this method lacks a strict theoretical basis, and misjudgment may occur, and it is impossible to find out the real unit that has the greatest impact on the transient stability of the system.

Method used

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  • Critical cluster identifying method for transient stability analysis of power system
  • Critical cluster identifying method for transient stability analysis of power system
  • Critical cluster identifying method for transient stability analysis of power system

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Embodiment Construction

[0029] The specific embodiments of the present invention will be described in further detail below in conjunction with the drawings and embodiments. The following examples are used to illustrate the present invention, but not to limit the scope of the present invention.

[0030] The critical unit group identification method for power system transient stability analysis of the present invention uses energy margin as a quantitative indicator of system stability, and the sensitivity of energy margin to generator mechanical power can quantitatively describe generator pair The impact of system transient stability. The energy margin is denoted as W m , W m >0, the power system is transiently stable, W m m =0 is a critically stable situation. W m The larger the value, the better the transient stability. W m Mechanical power P to generator i m, i The sensitivity of is recorded as:

[0031] S g , i = ΔW m ΔP m , i .

[0032] S g, i >0 means increas...

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Abstract

The invention discloses a critical cluster identifying method for transient stability analysis of a power system. The critical cluster identifying method comprises the following steps: obtaining a critical clearing time of a fault by using time domain simulation; obtaining a critical stable track and a critical unstable track of the power system according to the critical clearing time; determining a leading unstable balance point according to the critical stable track and the critical unstable track so as to obtain a power angle of each generator at the leading unstable balance point; carrying out simulation according to the actual clearing time of the fault so as to obtain a fault track; calculating the sensitivity of an energy margin to the mechanical power of each generator according to the fault track and the power angle of each generator at the leading unstable balance point; and identifying generators of a predetermined number in the generators, of which the calculation results of the sensitivities are negative values, as the critical cluster. According to the critical cluster identifying method for transient stability analysis of the power system, the critical cluster is identified according to the sensitivity of the mechanical power of each generator based on the energy margin; the identification accuracy is improved; and the situation of misjudgment is reduced.

Description

Technical field [0001] The invention relates to the technical field of power system analysis, in particular to a critical machine group identification method for power system transient stability analysis. Background technique [0002] Transient stability is an important part of power system security and stability. The grid operation department needs to perform a large number of transient stability calculations for the expected operation mode to ensure that the grid can maintain transient stability under the expected failure. In transient stability analysis, the identification of critical clusters is of great significance for stability control. The critical unit under a certain fault is the generator that has the greatest impact on the transient stability of the system under the fault. If the system is transiently unstable under this fault, the optimal control strategy is to reduce the mechanical power of the critical unit and increase the mechanical power of other units accordi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
Inventor 陈磊侯凯元徐兴伟邵广惠李泽宇刘永奇贾伟马新刘家庆夏德明岳涵王克非吴远志张毅威
Owner NORTHEAST CHINA GRID
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