Power system transient stability determination method

A technology of transient stability and power system, which is applied in the direction of electrical components, circuit devices, AC network circuits, etc., and can solve the problems of not fully considering the influence of power system load dynamic characteristics on load stability, etc.

Inactive Publication Date: 2015-08-19
TSINGHUA UNIV +3
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Problems solved by technology

[0005] The existing power system stability analysis is mainly offline static analysis, which does not fully consider the dynamic characteristics of the power system load and its impact on load stability.

Method used

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  • Power system transient stability determination method
  • Power system transient stability determination method
  • Power system transient stability determination method

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Embodiment Construction

[0056] The power system transient stability judgment method proposed by the present invention comprises the following steps:

[0057] (1) Simplify the comprehensive load model of the power system into the following form:

[0058] X ′ = X R + X S P com = P 0 P com _ m 0 = P m 0 ...

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Abstract

The invention relates to a power system transient stability determination method, and belongs to the field of a power system stabilization analysis and monitoring technology. According to the method, the dynamic process of a power system is deeply analyzed, a proper method is used to describe a transient process of the power system in a fault, and a load stability determination method of the power system is given. First of all, a state equation of an induction motor is analyzed, through combination with the measurement characteristics of the power system, an induction motor simplified model is brought forward, the dynamic characteristics of an induction motor mold are completely and effectively described, identification of online integrated load model parameters is performed on the simplified model, the state change of an integrated load model in the fault process of the power system is analyzed by taking a Liapunov method as a basis, and based on this, correlation criteria of critical clearing time and load instability of the power system are given. The method provided by the invention can rapidly realize parameter identification and stability determination of the integrated load model of the power system, at the same time, ensures quite high accuracy and reliability, and meets an online application requirement.

Description

technical field [0001] The invention relates to a method for judging the transient stability of a power system, belonging to the technical field of power system stability analysis and monitoring. Background technique [0002] The load is an important part of the power system, and the load has an important impact on the stability of the power system. With the continuous expansion of the grid scale and the continuous increase of large power loads, problems directly related to loads such as transient voltage stability have become increasingly prominent. However, there is currently a lack of reliable and effective load models and parameters in power grid analysis and calculation. In practical applications, there is no effective basis and scientific methods for judging transient voltage stability. Especially in online application scenarios, there is no reasonable solution to related problems. [0003] The dynamic and static integrated load model is a load model widely used in po...

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Application Information

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IPC IPC(8): H02J3/00H02J13/00
Inventor于松泰张树卿才洪全华科于之虹严剑锋
OwnerTSINGHUA UNIV