Power Grid Transient Stability Evaluation Method Based on Energy Function

A technology of energy function and power grid transient state, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as large amount of calculation, low speed, complicated evaluation process, etc., to improve calculation speed, improve application, The effect of simplifying the calculation process

Inactive Publication Date: 2017-03-01
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Application Information

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Problems solved by technology

However, these methods are computationally intensive, the evaluation process is complex, the speed is low, and it is easy to cause errors

Method used

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  • Power Grid Transient Stability Evaluation Method Based on Energy Function
  • Power Grid Transient Stability Evaluation Method Based on Energy Function
  • Power Grid Transient Stability Evaluation Method Based on Energy Function

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Embodiment

[0064] The study found that the energy function has the advantage of being easy to construct quantitative indicators, and can quantify the multi-machine system in the form of energy through the advantages of the energy function, and give specific quantitative values, but some parameters in the model are difficult to obtain quickly and accurately, so combined with The parameters of the wide-area measurement system are quickly and accurately acquired to make up for this shortcoming. The potential energy boundary value calculation method based on the quadratic perturbation method can avoid directly calculating the unstable equilibrium point on the boundary of the stable domain. The technical scheme of the present invention will be described in detail below with a three-machine system (n=3).

[0065] Part 1: Wide-area measurement system application framework

[0066] In the present invention, the application of the wide-area measurement system, its specific implementation framewo...

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Abstract

The invention relates to a wide area measurement system and energy function combination-based assessment method for transient stability of a grid. The invention discloses an energy function-based assessment method for the transient stability of the grid. The technical scheme adopted by the invention is that the energy function-based assessment method for the transient stability of the grid comprises the following steps of collecting data by a wide area measurement system, and establishing a transient energy function model; collecting system data during a transient process, and establishing a transient energy function model to obtain the total energy of n generators in the system; establishing secondary disturbance-based transient stability quantitative index model according to the energy transformation track of a secondary disturbance process; establishing an energy margin index, and performing Ts(t) judgment according to the energy margin index. According to the energy function-based assessment method disclosed by the invention, by means of the online access advantage of parameters of the wide area measurement system and the calculation advantage of energy functions, the calculation speed is increased, the calculation process is simplified, and further, the application of a direct method in an electrical power system is broadened.

Description

technical field [0001] The invention relates to the technical field of power system transient stability analysis, in particular to a power grid transient stability evaluation method based on the combination of a wide-area measurement system and an energy function. Background technique [0002] In recent years, due to the continuous expansion of the scale of the power system, the structure of the power grid has become increasingly complex, and the security and stability of the power system have become increasingly serious. In power system stability failure accidents, transient stability failure accidents account for a large part, which shows the importance of transient stability research. Energy margin has always been considered as an important index to evaluate the transient stability of power system, and the online application of energy margin is the key technology to realize transient stability evaluation. How to realize the online application of energy margin more quickly...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G06F19/00
Inventor刘群英刘起方胡志远田贵云任文伟孟劲松
OwnerUNIV OF ELECTRONICS SCI & TECH OF CHINA