Three-segment out-of-step self-adaptive disconnecting method

An adaptive, three-stage technology, applied to electrical components, information technology support systems, circuit devices, etc., can solve problems such as refusal to operate, inaccurate, and device malfunction, and achieve fast action, mature computing technology, and simple design Effect

Inactive Publication Date: 2009-09-02
STATE GRID SICHUAN ELECTRIC POWER +1
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  • Abstract
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  • Claims
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Problems solved by technology

But in fact, due to the complex operation mode of the power grid, the out-of-step oscillation center does not fall in the predicted position in many cases, and it is inaccurate to locate the oscillation center by low voltage or conventional impedance in a multi-machine system, and even the difference is very large. large, which may lead to misoperation or refusal of the device and have serious consequences

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  • Three-segment out-of-step self-adaptive disconnecting method

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Embodiment Construction

[0021] The following is a preferred embodiment of the present invention, and the technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0022] Such as figure 1 As shown, a typical equal-value system of two machines divides the line into two sections AB and B'C, and the out-of-step decoupling devices are respectively installed at four points A, B, B', and C, and Zl 1 and Zl 2 Represent the impedance of the two lines respectively.

[0023] (1) When the oscillation center falls between A and B, the out-of-synchronization decoupling device installed at points A and B will act in the first stage. The direction will not move in the opposite direction, and the device at point C will not move if the oscillation center exceeds 80% of the total length of the line.

[0024] (2) When the center of oscillation falls between B'C, the out-of-synchronization decoupling device installed at points B' and C will act in the ...

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Abstract

The invention discloses a three-segment out-of-step self-adaptive disconnecting method. The method utilizes effective rapid detection to judge system out-of-step and accurately measure criterions of an oscillation center, and performs disconnecting judgment in three segments according to whether the oscillation center is in a protection scope of a device-installing position during the out-of-step, thus an out-of-step disconnecting device can perform self-adaptive judgment for disconnection as a relay protection device so as to provide convenience for setting fixed values of users and adapt to the changes of system modes. Therefore, the out-of-step disconnecting device as a third defense line of a power system can rapidly and accurately act so as to guarantee the safe steady operation of the power system.

Description

technical field [0001] The invention belongs to the technical field of power system automation. More precisely, the invention is a new criterion design for judging system out-of-synchronization based on local electrical quantities and adopting a three-stage self-adaptive decoupling according to the position of the oscillation center. method. Background technique [0002] With the construction of the UHV power grid, the connection between the regional power grids has been greatly strengthened, and the stability characteristics have become more complex. It is urgent to study the power grid decoupling control technology in extreme emergencies. Principle When judging the out-of-synchronization oscillation of the line, it needs at least one oscillation period of judgment time, and due to the uncertainty of the oscillation center, it is difficult for each out-of-synchronization decoupling device to cooperate with each other, which cannot fully meet the needs of power grid stabilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J13/00H02H7/22G01R31/08
CPCY04S10/20Y02E60/725Y02E60/00
Inventor 李天华李德胜梁汉泉邵俊松王伟方勇杰庞晓燕杨卫东徐泰山刘福锁张长银薛禹胜
Owner STATE GRID SICHUAN ELECTRIC POWER
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