Process for evaluating transient stability of electric power system according to trace and trace sensitivity

A technology of trajectory sensitivity and transient stability, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as calculating trajectory sensitivity, and achieve the effect of fast calculation and high evaluation and intensive reading.

Inactive Publication Date: 2013-06-26
NORTHEAST DIANLI UNIVERSITY
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Problems solved by technology

So far, there have been no reports and practical applications of calculating the trajectory sensitivity based on the measured trajectory, and using this sensitivity to evaluate the stability of the system

Method used

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  • Process for evaluating transient stability of electric power system according to trace and trace sensitivity

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Embodiment Construction

[0022] The present invention will be further described below.

[0023] The present invention quantitatively evaluates the power system transient stability method according to trajectory and trajectory sensitivity, comprising the following steps:

[0024] 1. Calculation of Fault Clearance Time Sensitivity Based on Measured Trajectories

[0025] For stand-alone or multi-machine systems, the A three-phase short circuit occurs all the time. When the fault is removed at any time, the sensitivity of each generator power angle to the fault removal time is calculated according to formula (1):

[0026] (1)

[0027] For a multi-machine system, formula (1) is used to obtain the sensitivity of the power angle trajectory of each generator relative to the fault removal time, and the relative sensitivity of the two generators is calculated by subtracting the sensitivity of the power angle of the two generators to the fault removal time;

[0028] 2. Evaluate the stability of ...

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Abstract

The invention relates to a process for evaluating transient stability of an electric power system according to trace and trace sensitivity. The process is characterized by including steps of firstly, deriving a computing method for computing the sensitivity of the power angle trace of the electric power system relative to the fault clearing time according to the actually measured trace; and secondly, analyzing relationships between the sensitivity and the system critical time so as to conclude that the sensitivity can serve as a system stability degree evaluation index from the relationships according to a large number of simulation verifications. The process is simple in computing, provides an importance theoretical support for transient stability analysis of the electric power system on the basis of trace, and has the advantages of high computing speed, evaluation precision and application value, good online application prospect, and the like.

Description

technical field [0001] The invention relates to a method for quantitatively evaluating the transient stability of a power system according to a trajectory and trajectory sensitivity. Background technique [0002] With the continuous development of the national economy, the scale of the power system is becoming larger and larger, and the operation risks faced by the power system are also increasing. How to ensure the safe and stable operation of the power system has become the focus of attention of power companies and scientific researchers. Therefore, quantitative evaluation of the power system Transient stability is of great significance to the safe and stable operation of power systems. [0003] The existing methods for evaluating the stability of the system include the direct method and the numerical simulation method. The calculation results are greatly affected by the accuracy of the system model parameters, and the energy function and critical energy need to be calcula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
Inventor 穆钢安军邹建林徐兴伟刘洪波
Owner NORTHEAST DIANLI UNIVERSITY
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