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Method and system for determining alternating-current system fault range resulting in direct-current commutation failure

A technology of commutation failure and fault range, applied in information technology support systems, special data processing applications, instruments, etc., can solve problems such as high numerical stability requirements, large amount of access data, poor judgment accuracy, etc., to achieve evaluation Improve efficiency, ensure safe operation, and reduce impact

Inactive Publication Date: 2015-03-11
SOUTH CHINA UNIV OF TECH +1
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Problems solved by technology

[0013] The purpose of the present invention is to provide a method for determining the fault range of the AC system that causes the failure of DC commutation, aiming to solve the problem that the existing calculation process is time-consuming, the amount of data to be accessed is large, the requirement for numerical stability is high, and the accuracy of judgment is relatively low. bad question

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  • Method and system for determining alternating-current system fault range resulting in direct-current commutation failure
  • Method and system for determining alternating-current system fault range resulting in direct-current commutation failure
  • Method and system for determining alternating-current system fault range resulting in direct-current commutation failure

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[0026] In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0027] In the short-circuit current calculation program of the power system, when the AC system fails, the DC system does not provide short-circuit current, which is equivalent to an open circuit, so the voltage amplitude and phase angle at the commutation bus are not affected by the DC system. In addition, when the change of the DC link current caused by the change of the voltage of the converter bus is ignored, there is a definite correspondence between the arc extinguishing angle of the converter valve and the voltage of the converter bus. Therefore, another idea for judging whether an AC fault will cause DC commutation failure is to monitor the voltage phasor of the commutation bus through the calculation program of the short-circuit ...

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Abstract

The invention discloses a method and a system for determining the alternating-current system fault range resulting in direct-current commutation failure. The method includes the steps: firstly, determining the alternating-current power grid range and power grid data to be evaluated; secondly, determining a minimum extinction angle; thirdly, using a short-circuit current computing program to traverse faults in the alternating-current power grid range, and computing a voltage amplitude value and phase angle shift of a current conversion bus when a alternating-current power grid is at fault; then, computing extinction angles of the corresponding faults; and finally, evaluating the range that the alternating-current faults influence commutation failure. The method is efficient and accurate in judgment of commutation failure and is used for mastering operation personnel and evaluating operation states of alternating-current and direct-current systems, and evaluating efficiency of the method is greatly improved as compared with that of an existing evaluating method.

Description

technical field [0001] The invention relates to the field of high-voltage direct current transmission, in particular to a method for determining the fault range of an alternating current system that causes direct current commutation failure. Background technique [0002] HVDC has unique advantages in technology and economy, and has been widely used in long-distance, large-capacity power transmission and large-area networking. However, while it brings huge economic benefits, it also makes the grid structure more complex, and the interaction between AC and DC systems brings huge challenges to grid operators in terms of technology and management. Commutation failure is an important form of AC-DC dynamic interaction, among which DC commutation failure caused by AC system failure is the most common, and it is the most deeply researched and most concerned AC-DC interaction problem. Therefore, evaluating the impact of different fault locations and types of AC systems on DC commuta...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCY02E60/76Y04S40/22Y02E60/00
Inventor 蔡泽祥李晓华王朝硕杨欢欢徐敏
Owner SOUTH CHINA UNIV OF TECH
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