Power system oscillation identification method based on power angle calculation

An identification method and power system technology, applied in the direction of fault location, etc., can solve problems such as long time delay and faults in the area, and achieve the effect of improving reliability

Active Publication Date: 2011-09-28
BEIJING SIFANG JIBAO AUTOMATION +1
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  • Abstract
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Problems solved by technology

The defect of this identification method is that: when the power angle of the power supply on both sides is large, an internal fault occurs, and the delay of protection opening may be too long in the case of some asymmetrical short-circuit faults (maybe more than 1s)

Method used

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  • Power system oscillation identification method based on power angle calculation
  • Power system oscillation identification method based on power angle calculation
  • Power system oscillation identification method based on power angle calculation

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Embodiment Construction

[0039] The technical solutions claimed in the present invention will be described in detail below according to the drawings in the description and in combination with specific embodiments.

[0040] The basic principle of oscillation identification based on power angle calculation is as follows:

[0041] When the system is oscillating, the potentials on both sides will open the δ angle. When the δ angle is not too large (usually 80° can be used as the boundary criterion for instability), the action speed of the distance protection can be accelerated. At this time, even if the system is in oscillation state, then it will not have too much impact on the distance protection, similar to the system being in an overload state; when the δ angle is large (greater than 80°), the relay protection should quickly identify oscillations and faults, if If it is judged to be oscillation, the distance protection should be blocked to prevent misoperation. The δ value is calculated by the known ...

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Abstract

The invention discloses an oscillation identification method based on power angle calculation between equivalent potentials on both sides of a system. The method comprises oscillation identification when a power system runs in full phase and non-full phase. The voltage of an oscillation center and the equivalent potentials of the system can be calculated when the system runs in full phase or non-full phase, so oscillation identification of a power angle between the equivalent potentials on both sides of the system can be realized. By the method, the power angle can be calculated when the power system runs in non-full phase; by adoption of the method, the running reliability and the running speed of a relaying protection device are enhanced, so quick and reliable identification of oscillation and a short-circuit fault, stability and safety of the power system, and power supply stability can be facilitated.

Description

technical field [0001] The invention belongs to the technical field of power systems and automation thereof, and in particular relates to an oscillation identification method. technical background [0002] In the field of power system and its automation, it is one of the important issues to be improved to correctly identify power system oscillations and faults, and quickly detect faults during oscillations to remove faulty sections. [0003] For symmetrical short-circuit faults that occur during oscillation, the commonly used The method of estimating the oscillation center voltage constitutes a symmetrical fault discrimination element (U m is the measured voltage at the protective installation, is the measured voltage U at the protective installation m and measure the current I m angle between). This identification method has a relatively long delay (usually 150 ms), and may cause large errors due to estimation. For asymmetrical short-circuit faults that occur during...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 黄少锋张月品王增平徐振宇伍叶凯李天佼魏会利
Owner BEIJING SIFANG JIBAO AUTOMATION
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