Criterion for measuring breaking step oscillation center position based on in situ electric quantity

A technology of oscillation center and electrical quantity, applied in the direction of fault location, reducing/preventing power oscillation, etc., can solve the problems of refusal to operate, device malfunction, large difference, etc., and achieve the effect of flexible and convenient use, accurate and reliable judgment, and simple design

Inactive Publication Date: 2009-05-27
STATE GRID SICHUAN ELECTRIC POWER +1
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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

Method used

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  • Criterion for measuring breaking step oscillation center position based on in situ electric quantity

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Embodiment Construction

[0021] The following is a preferred embodiment of the present invention, and the technical solution realized by 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 with 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 Z1 1 and Z1 2 Represent the impedance of the two lines respectively.

[0023] (1) When the oscillation center falls between A and B, if the conventional low voltage criterion is used to determine the unloading range, if the set value is set too high, all the unloading devices installed at the four points of ABB'C will act, if If it is set too low, it may refuse to operate; and after adopting this criterion, it can be accurately measured that the oscillation center is between AB, and only the decoupling devices at A and B act, which preven...

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Abstract

The invention discloses a criterion for combining local electrical amount with relevant line parameters to accurately measure the position of an oscillation center and measure the position of a system desynchronizing oscillation center based on in-situ electrical amount. The popularization and application of the criterion for measuring the position of a system desynchronizing oscillation center based on in-situ electrical amount can realize in-situ, safe and reliable power system desynchronizing stepout control with quick action and definite action scope by combining reliable stepout criterion and realize the cooperative control of multiple sets of desynchronizing stepout devices by automatically adapting different power network running modes.

Description

technical field [0001] The invention relates to an electric power system automation technology, in particular to a criterion based on the position of the out-of-step oscillation center of an in-situ electric quantity measurement system. 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. There are various widely used out-of-step decoupling devices. When issuing an unloading command, it is necessary to know the distance between the oscillation center and the unloading device. Usually, the low voltage or impedance circle is used to determine whether the oscillation center is within the unloading range required by the user. These criteria cannot accurately locate the oscillation center. It cannot fully meet the needs of power gri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08H02J3/24
Inventor 李天华李德胜王伟邵俊松庞晓燕方勇杰梁汉泉杨卫东徐泰山刘福锁张长根薛禹胜
Owner STATE GRID SICHUAN ELECTRIC POWER
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