Determination method and device for critical clearing time

A technology of critical cutting time and determination method, which is applied in the field of power grid analysis, can solve problems such as long computer time consumption, failure to specify the system, and heavy calculation workload, so as to achieve the effect of improving calculation speed and ensuring accuracy

Inactive Publication Date: 2017-08-15
STATE GRID CORP OF CHINA +1
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Problems solved by technology

Some disadvantages of the time-domain simulation method include: ①When it is used for the transient stability analysis of the whole process of a large system, the calculation workload is large and the computer time is long
②It can only judge whether the system is stable or unstable, and cannot provide a continuously quantified numerical index; ③For the large amount of information obtained in the simulation process, the utilization rate is low
Although the transient energy function method has become mature, there are still many shortcomings and limitations in practica

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  • Determination method and device for critical clearing time
  • Determination method and device for critical clearing time
  • Determination method and device for critical clearing time

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[0088] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0089] See attached figure 1 , Is the flow chart of the method for determining the critical resection time disclosed in the present invention, such as figure 1 As shown, the method may include:

[0090] Step 101: Determine the initial value of critical resection time t through direct calculation cr .

[0091] Among them, the critical removal time t cr It refers to the maximum cut-off time that enables the system to maintain transient stability. ...

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Abstract

The invention discloses a determination method and device for critical clearing time. According to the method, first, a critical clearing time initial value tcr is calculated and determined through a direct method, second, a search range is determined according to the critical clearing time initial value tcr and a time domain simulation system error; and last, a dichotomy method is adopted to search for and determine the critical clearing time CCT within the search range. According to the determination method and device for the critical clearing time, a calculation result of the direct method is used as the initial value, a time domain simulation method is adopted to perform precise search based on the initial value, and therefore the accuracy of a critical clearing time result is guaranteed while calculation speed is increased.

Description

technical field [0001] The present invention relates to the field of power network analysis, and more specifically, relates to a method and device for determining a critical cut-off time. Background technique [0002] In recent years, as the country has vigorously promoted the construction of power grids, the scale of power grids has become larger and larger, and the power grid systems have become more and more complex. The safe and reliable operation of large power grids has become a key research topic for technicians in the field. In the power grid analysis work, the calculation of the transient stability limit is of great significance to the safe operation of the power grid. At present, the main methods for analysis of transient stability parameters are time-domain simulation method and direct method. [0003] The time-domain simulation method uses detailed models and step-by-step integration methods to obtain the precise running trajectory of the system after a fault. ...

Claims

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Application Information

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IPC IPC(8): G06F17/11G06F17/13
Inventor 吴淘骆立实简哲袁越刘一琛徐浩许福昌张凡马双亮赵薇王静霍庆颖李亚明田春雨纪会菊
Owner STATE GRID CORP OF CHINA
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