Traveling wave differential protection method and system for VSC-MTDC

A differential protection and traveling wave technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as difficult engineering applications, and achieve the effect of strong engineering practicability and less exchange of information

Inactive Publication Date: 2019-08-09
HUAZHONG UNIV OF SCI & TECH +1
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  • Claims
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Problems solved by technology

However, compared with the conventional DC transmission system, the fault development process of VSC-MTDC is extremely fast, and the entire power grid can be endangered within a few milliseconds. The traditional HVDC protection scheme cannot meet its extremely fast action time requirements, and it is difficult to implement Practical engineering application

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  • Traveling wave differential protection method and system for VSC-MTDC
  • Traveling wave differential protection method and system for VSC-MTDC
  • Traveling wave differential protection method and system for VSC-MTDC

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Embodiment Construction

[0028] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0029] Such as figure 1 As shown, a VSC-MTDC-oriented traveling wave differential protection method in the embodiment of the present invention includes the following steps:

[0030] The local line-mode voltage and local line-mode current of the calibrated line in the multi-terminal flexible direct current transmission network are obtained, and the change rate of the local line-mode voltage and the change rate of the local line-mode current are determined.

[0031] Determining traveling wave energy according to the change rate of the local line-mode voltage and the change rate of the local line-mode current, and determining whether a fault occurs in the multi-terminal flexible direct current transmission network acco...

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Abstract

The invention relates to a traveling wave differential protection method and system for VSC-MTDC. The method comprises a step of obtaining a local line mode voltage and a local line mode current of acalibration line in a multi-terminal flexible direct current transmission grid and determining a local line mode voltage change rate and a local line mode current change rate, a step of determining traveling wave energy according to the local line mode voltage change rate and the local line mode current change rate and determining whether the multi-terminal flexible direct current transmission grid is failed according to the traveling wave energy, and a step of performing Boolean-based identification on a failure type according to the traveling wave energy when a condition that the multi-terminal flexible direct current transmission grid is failed is determined and performing corresponding protection on the calibration line according to the identified and determined failure type. Accordingto the technical scheme of the invention, protection devices on two sides of the line do not need to be synchronized, the amount of information exchanged between the two devices is small, and the engineering implementability is high.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a VSC-MTDC-oriented traveling wave differential protection method and system. Background technique [0002] VSC-MTDC (Multi-terminal HVDC Based on Voltage Source Converter, multi-terminal flexible direct current transmission network based on voltage source converter) refers to a high-voltage direct current transmission network composed of three or more converter stations and their direct current transmission lines The system has broad application prospects in the fields of new energy grid connection, large-capacity long-distance power transmission, and new urban DC distribution network. However, compared with the conventional DC transmission system, the fault development process of VSC-MTDC is extremely fast, and the entire power grid can be endangered within a few milliseconds. The traditional HVDC protection scheme cannot meet its extremely fast action time requirements, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCH02H7/262H02H7/268
Inventor 林湘宁童宁魏霖李正天郑宇超随权金能
Owner HUAZHONG UNIV OF SCI & TECH
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