Method and system for preventing electric network from collapsing

A technology for power grids and substations, which is applied in the field of preventing power grid collapse, can solve problems such as power grid collapse, and achieve the effects of reducing electricity load, improving overload conditions, and preventing frequency collapse.

Inactive Publication Date: 2009-01-14
广州市华电技术有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method and system for preventing grid collapse, which can overcome the grid collapse defect caused by the failure of the low-frequency load shedding device to remove the secondary load in time when the transmission line fails

Method used

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  • Method and system for preventing electric network from collapsing

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Effect test

Embodiment approach 1

[0024] What Fig. 1 shows is the schematic diagram of the embodiment of the present invention: this system comprises hub substation 1, regional power grid 1-1, 1-2 and 1-3, transmission line 2-1 and 2-2, generating set 5-1 passes through The circuit breaker 5-11 is connected to the regional power grid 1-1, and the regional power grid 1-1 is connected to the hub substation 1; the generator sets 5-2 and 5-3 are respectively connected to the regional power grid 1-2 and 1-3, and the regional power grid 1- 2 and 1-3 are respectively connected to the hub substation 1 through the transmission lines 2-1 and 2-2 through the circuit breakers 2-11 and 2-21; the on-load voltage regulating transformer 3 is installed in the substation of the regional power grid 1-1, and the power distribution Lines 4-1, 4-2, and 4-3 are connected to transformer 3 via circuit breakers 4-11, 4-21, and 4-31; remote signaling and telemetry devices 2-111 are respectively installed on transmission lines 2-1, 2-2 ,...

Embodiment approach 2

[0026] The console 61 of the embodiment shown in Fig. 1 has two control modes of "signal display, manual confirmation" and "signal display, automatic cutting". Unit 5-1 accident, console 61 displays "transmission line (unit) accident" signal, and automatically completes the following operations: start the remote control device 4-111, 4-211 to cut off the power distribution line 4-1, 4-2; start the remote control Device 3-1, adjust the tap of the on-load tap changer 3 to the maximum position, reduce the operating voltage of the distribution lines 4-1, 4-2, 4-3; start the remote signal telemetry remote control device 5-111, start The generator set 5-1 generates power or increases the active output of the generator set 5-1. When the console 61 is set in the "signal display, manual confirmation" control mode, the process of removing part of the load during an accident is the same as the best embodiment 1.

[0027] Certainly, the console 61 of the above-mentioned embodiment may be...

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Abstract

The invention disclose a kind of method and system for preventing electric network from collapsing. The method and system contains underfrequency load-shedding, and uses transmission line and fault signal of machine set to excise accessory load in power-fail area, prevents stability destroyed to network splitting caused by large scale overload of transmission line and frequency collapse caused by seriously insufficient wattful power in power-fail area and too high frequency to parallel network splitting caused by seriously superfluous wattful power in power-rich area. So a kind of electric network collapsing accidents, such as New York blackout in American in 2003, total blackout in Canada in 2003 and island-wide blackout in Taiwan, can be prevented.

Description

Technical field: [0001] The invention belongs to the category of electric power operation, and in particular relates to a method and system for preventing grid collapse. Background technique: [0002] The power grid includes transmission lines (for the convenience of description, this application document generally refers to the high-voltage transmission lines connecting the regional power grids as transmission lines), hub substations (for the convenience of description, this application document generally refers to the substations connecting the transmission lines and regional power grids as Hub substation), large generating units and several regional power grids, regional grids are connected to hub substations, transmission lines connect each hub substation into a power transmission network, and large generating units are connected to hub substations or through regional grids to hub substations. In this way, large-scale generating sets generate electricity for use by the r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 谢运祥蒋金良卢培铨徐洁陈俊标
Owner 广州市华电技术有限公司
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