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Circuit breaker transient characteristic analysis method and device in direct current system

A technology of DC system and transient characteristics, which is applied in the field of DC system and can solve problems such as unreliable use of circuit breaker simulation analysis methods

Active Publication Date: 2021-09-21
GUANGZHOU BUREAU CSG EHV POWER TRANSMISSION
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  • Application Information

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Problems solved by technology

[0004] Based on this, it is necessary to provide a method and device for analyzing the transient characteristics of a circuit breaker in a DC system in view of the unreliable use of the traditional circuit breaker simulation analysis method

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  • Circuit breaker transient characteristic analysis method and device in direct current system
  • Circuit breaker transient characteristic analysis method and device in direct current system
  • Circuit breaker transient characteristic analysis method and device in direct current system

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Embodiment Construction

[0038] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be described more comprehensively through the following embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present application, not to limit the present application.

[0039] In one embodiment, a method for analyzing transient characteristics of a circuit breaker in a DC system is provided. The method mainly analyzes the transient characteristics of a circuit breaker in a DC system. The DC system refers to the HVDC transmission system that has been built or has not yet been built at home and abroad. Further, the DC system may also be an UHV hybrid multi-terminal DC system. Take the Kunliulong DC project as an example. The project relies on the Wudongde Hydropower Station and adopts a three-terminal hybrid DC transmission scheme of ±8...

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Abstract

The invention relates to a circuit breaker transient characteristic analysis method and device in a direct current system. After system parameters of a direct-current system are obtained, large-step simulation is carried out on the system parameters to obtain switching parameters of each circuit breaker when the direct-current system breaks down, then a distribution function corresponding to a fault action probability and a fault current is obtained based on the switching parameters, and the maximum fault current of each circuit breaker is obtained according to the distribution function. And small-step simulation is carried out on each circuit breaker according to the maximum fault current, transient characteristic parameters of each circuit breaker are obtained, and the transient characteristic parameters are used for judging the breaking capacity of each circuit breaker. According to the method, the transient characteristics of the circuit breaker can be accurately analyzed under the conditions that the circuit breaker faces various short-circuit types and the short-circuit current changes are complex, the fault problem of the high-voltage circuit breaker can be quickly found, the method serves as powerful guidance for controlling a direct-current system, and use is reliable.

Description

technical field [0001] The present application relates to the technical field of DC systems, in particular to a method and device for analyzing transient characteristics of circuit breakers in DC systems. Background technique [0002] The DC system generally refers to the high-voltage DC system. The HVDC transmission projects currently in operation are generally used for long-distance and large-capacity power transmission. With the development of science and technology, after the flexible DC mode with significant advantages is applied to the UHV power grid, it has multiple functions such as simultaneous start and stop of three stations, online switching and withdrawal. The flexible DC adopts the voltage source converter of the multi-level sub-module, which can solve the double-terminal DC problem, has good working performance and is widely used. [0003] However, the control and protection strategies of the flexible DC system are more complicated than those of the double-te...

Claims

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Application Information

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IPC IPC(8): G01R31/327G06K9/62
CPCG01R31/3274G06F18/23213G06F18/24
Inventor 周登波陆启凡周勇焦华邓健俊严海健顾硕铭柳林海焦石李倩陈海永叶鑫王和雷梁子鹏徐攀腾朱博郭云汉刘子鹏郑锐举杨学广廖晨江
Owner GUANGZHOU BUREAU CSG EHV POWER TRANSMISSION
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