Electric network destabilization on-line automatic recognition method based on phasor measuring technique

A power grid disturbance and phasor measurement technology, applied in the power grid field, can solve problems such as short-circuit fault, system collapse, power failure, etc., and achieve the effect of preventing the further expansion of the fault range.

Inactive Publication Date: 2009-09-16
NARI TECH CO LTD +2
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Problems solved by technology

Although the large power grid has obvious advantages, it also brings potential safety problems. For example, some disturbances in the local power grid, especially short-circuit faults, etc., will affect the adjacent large areas. If not handled properly, it may expand to Systematic accidents may even lead to the collapse of the entire system, causing large-scale power outages

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  • Electric network destabilization on-line automatic recognition method based on phasor measuring technique

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Embodiment Construction

[0028] The following is an embodiment of the present invention, which includes the dynamic process of a short-circuit fault in the power grid, and the method of the present invention can accurately identify the short-circuit disturbance and the short-circuit fault equipment.

[0029] figure 1 It is the power grid dynamic process curve diagram of short-circuit disturbance in the power grid. The fault is an instantaneous short-circuit fault of phase A. During the short-circuit process, the voltage of phase A suddenly decreases, and the current of phase A suddenly increases. If the amount of increase is greater than the set voltage and current mutation thresholds, it is considered that a short-circuit disturbance has occurred in the power grid.

[0030] Among the monitored short-circuit disturbance devices, the short-circuit current contributed by each device in the power grid to the short-circuit disturbance can be calculated by using the formula Isc=I(t+1)-I(t). By judging the ...

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Abstract

The online automatic identification method of power grid disturbance based on phasor measurement technology includes the following steps: (1) Using the real-time data collected by the phasor measurement unit, based on the pattern analysis theory, according to the variable law of the electrical parameters of the power grid such as voltage and current, infer Whether there is a short-circuit disturbance and short-circuit equipment in the power grid; (2) Using the real-time data collected by the phasor measurement unit, based on the model analysis theory, according to the variable rules of the electrical parameters of the power grid such as power and frequency, infer whether there is a machine-cutting disturbance in the power grid . The method of the present invention comprehensively considers the characteristics of various state quantities that characterize the operating state of the power system, and extracts a small number of useful feature components that can distinguish disturbance types, and the method can quickly and accurately identify short-circuit and machine-cut disturbances in the power grid , assist the dispatcher to deal with the fault, and prevent the further expansion of the fault range.

Description

technical field [0001] The invention belongs to the technical field of power grids, and more precisely, the invention relates to a method for on-line identification of power grid disturbances. Background technique [0002] With the cross-regional interconnection of my country's power system, the scale of the power grid is getting larger and the structure is becoming more and more complex. Although the large power grid has obvious advantages, it also brings potential safety problems. For example, some disturbances in the local power grid, especially short-circuit faults, etc., will affect the adjacent large areas. If not handled properly, it may expand to Systematic accidents may even lead to the collapse of the entire system, causing large-scale power outages. [0003] The new-generation wide-area measurement system based on the synchrophasor measurement unit uses computer technology and modern high-speed digital communication network to realize the synchronous sampling of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G01R31/08
Inventor 姚建国郑涛高伏英李海峰苏大威
Owner NARI TECH CO LTD
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