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Micro-grid line protection algorithm based on disturbance voltage

A technology of disturbance voltage and line protection, applied in emergency protection circuit devices, electrical components, etc., can solve the problem of overcurrent protection of distribution network not being able to protect micro-grid, and achieve the effect of simplifying calculation difficulty, improving stability, and improving sensitivity

Active Publication Date: 2015-03-25
STATE GRID CORP OF CHINA +1
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AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the traditional distribution network overcurrent protection cannot protect the microgrid, the present invention provides a microgrid line protection algorithm based on disturbance voltage

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0012] A microgrid line protection algorithm based on disturbance voltage, including the following steps:

[0013] S1: Use voltage transformer to detect the three-phase terminal voltage U of the microgrid a , U b And U c ;

[0014] S2: Three-phase terminal voltage U measured in S1 a , U b And U c After Parker transformation in the relay protection device, it is transformed into the DC quantity U under the dq two-phase rotating coordinate system dr , U qr ;

[0015] S3: U obtained by S2 transformation qr With reference signal U qref Compare, get the disturbance voltage V e , Ve=Uqr-Uqref, U qref Is the U under normal operation of the microgrid qr ;

[0016] S4: When the microgrid disturbance voltage V e The maximum value V emax Satisfy When the protection relay sends out a trip command 1s later, when the microgrid disturbs the voltage V e The maximum value V emax Satisfy When the relay protection device issues a trip command 0.5s later, when the microgrid disturbs the voltage V e ...

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Abstract

The invention relates to a micro-grid line protection method, in particular to a micro-grid line protection algorithm based on disturbance voltage. The method comprises the following steps that (1) a standard voltage transformer is used for detecting three-phase terminal voltage; (2) alternating voltage is converted into direct current through the Park transformation; (3) the direct current and a reference signal (Uqref) are compared to obtain the disturbance voltage (Ve); (4) according to the micro-grid disturbance voltage, a trip instruction is sent in a delayed mode. According to the micro-grid line protection algorithm, the micro-grid operation characteristics are fully considered, the micro-grid protection action reliability is improved, and the micro-grid line protection algorithm has good prospects.

Description

Technical field [0001] The invention relates to a line protection method of a micro-grid, in particular to a micro-grid line protection algorithm based on disturbance voltage. Background technique [0002] With the rapid development of my country's national economy, the demand for electricity is growing rapidly, and the pace of power grid construction is accelerating. However, as the scale of the power grid continues to expand, the drawbacks of the ultra-large-scale power system are also becoming increasingly apparent: high costs, large losses, and difficulty in operation, making it difficult to meet users' increasing requirements for power supply safety and reliability. In addition, traditional power grids consume a large amount of coal-based energy. With the continuous shortage of energy supply and the continuous improvement of ecological civilization awareness, microgrids have begun to be introduced into the power system. [0003] After distributed power sources are connected t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 张建昌韩涛闫俊杰李江浩吴英闫红星亢耀生岳俊峰贺春宁
Owner STATE GRID CORP OF CHINA
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