Method for detecting multi-terminal DC system fault based on transient high frequency energy

A high-frequency energy, multi-terminal DC technology, which is applied to the fault location, fault detection according to the conductor type, and electrical measurement, can solve the problem of not deriving a clear analytical expression for the fault current of the multi-terminal DC system, lack of theoretical basis, and large investment costs, etc. problems, to achieve the effect of easy threshold setting, improved robustness, and low sampling frequency requirements

Inactive Publication Date: 2019-04-02
SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
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Problems solved by technology

[0003] 1. There is no derivation of a clear analytical expression for the fault current of the multi-terminal DC system;
[0004] 2. The protection method relies on simulation and lacks a solid theoretical foundation;
[0005] 3. The sampling rate required by the protection method is high, and the investment cost is relatively large

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  • Method for detecting multi-terminal DC system fault based on transient high frequency energy
  • Method for detecting multi-terminal DC system fault based on transient high frequency energy
  • Method for detecting multi-terminal DC system fault based on transient high frequency energy

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Embodiment Construction

[0031] based on the following Figure 2 ~ Figure 5d Preferred embodiments of the present invention will be described in detail.

[0032] The present invention provides a multi-terminal DC system fault detection method based on transient high-frequency energy, establishes the analytical expression of the fault component current of the multi-terminal DC system line, and obtains the transient high-frequency energy of the current according to the analytical expression of the fault component current, If the transient high-frequency energy of a certain line exceeds the preset protection threshold, it is judged that the line is a faulty line.

[0033] For short-term fault analysis, the high-frequency component in the analytical expression of the fault component current of the line plays a major role, and only keeping this component can greatly simplify the inverse Laplace transform while ensuring a small calculation error. A clear analytical expression of the fault component current...

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Abstract

The invention discloses a method for detecting a multi-terminal DC(direct current) system fault based on transient high frequency energy, characterized by establishing an analytical expression of a fault component current of a multi-terminal DC system line; obtaining the transient high frequency energy of the current according to the analytical expression of the fault component current; and if thetransient high frequency energy of a line exceeds a preset protection threshold, determining that the line is a fault line. The invention has the following advantages: the threshold setting is easy to be realized, the robustness of the fault detection of the multi-terminal DC system is improved, the sampling frequency is low, and the transition resistance is good.

Description

technical field [0001] The invention relates to a multi-terminal DC system fault detection method based on transient high-frequency energy. Background technique [0002] In recent years, voltage source converter (VSC) HVDC systems have been widely used in industrial practices such as large-scale new energy grid integration and regional grid asynchronous interconnection. In a multi-terminal direct current (MTDC) system, the converters are connected radially or meshed through DC lines, which is considered to be the best solution for long-distance power transmission under new energy access. Fault analysis and fault detection of multi-terminal DC systems are still one of the major challenges for the future development of DC grids. Many scholars have studied the fault characteristics and fault detection methods of multi-terminal DC systems, but these studies have some limitations: [0003] 1. There is no derivation of a clear analytical expression for the fault current of the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R31/08
CPCG01R31/00G01R31/085G01R31/088
Inventor 沈冰李佳朋李宇骏周德生宋国兵邹晓峰
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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