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Isolated grid recognition system and method

A technology for identifying systems and isolated nets, applied to fault locations, detecting faults according to conductor types, etc., can solve problems such as the inability to detect isolated nets independently and intuitively, and achieve the effects of avoiding detection blind spots, credible conclusions, and convenient operation.

Inactive Publication Date: 2018-05-01
王建安 +1
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Problems solved by technology

The above three islanding detection methods all have detection blind spots, and a device fixedly installed on the power grid must be used to detect and compare the signals before and after switching between grid-connected operation and island operation mode, in order to determine whether the power grid is in an "islanded" state. Independent and intuitive detection of orphaned networks

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  • Isolated grid recognition system and method

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Embodiment Construction

[0035] The isolated grid identification system is used to identify whether the small grid 2 in the large grid 1 is in an island operation state. According to the principle of electrotechnical science, for an AC grid system in a normal operating state, no matter whether the system is a single power supply system or a multi-power supply system, in the Different nodes of the power grid have the same frequency and frequency change rate, and the change law of the power frequency steady-state voltage waveform satisfies In the formula, U N is the rated voltage, f is the grid frequency, t' is the time, and θ is the phase angle. Ideally, the voltage frequency f measured at any point in the power grid at different times t' is constant at 50 Hz. In a steady-state power grid, although the value of the frequency f is always changing dynamically, at the same moment, the voltage frequency measured at any position of the grid is always the same, and its frequency change curve is also consis...

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Abstract

The invention provides an isolated grid recognition system which is used for recognizing whether a small power grid in a large power grid stays at an island operating state or not. The isolated grid recognition system comprises a reference acquisition device, a server connected with the reference acquisition device in a wireless communication manner, a comparative quantity acquisition device and arecognition device connected with the server and the comparative quantity acquisition device in a wireless communication manner. The invention further provides an isolated grid recognition method. According to the invention, detection blind areas and misjudgment caused by accidental fluctuations can be avoided, whether the small grid stays at an island operating state or not can also be visuallyand effectively detected, the operating personnel only need to ensure that the acquisition time of a second frequency is synchronized with that of a first reference frequency and that the acquisitiontime of a third frequency is synchronized with that of a second reference frequency, the operation is convenient, the calculation is simple, and the conclusion is credible; and there is no electricalconnection between the server and the reference acquisition device and between the recognition device and the comparative quantity acquisition device, so that strong current and weak current can be completely isolated, and the safety of the operating personnel is ensured.

Description

technical field [0001] The invention relates to an isolated network identification system and method. Background technique [0002] Large power grid power supply is currently the main grid networking and power supply method. There are also small grids that coexist with large grids. Small grids refer to grids and micro grids with a machine network capacity greater than 8%, and small grids that operate in isolation from the large grid. called an isolated network. Under normal circumstances, small power grids are merged into large power grids to form a large AC synchronous power grid. When due to some reasons, after the small grid is separated from the large grid, it may still be in a stable operation state under the action of its own power, voltage, and frequency stability control system. At this time, it can be called "island operation" state. Once the island is generated, it will endanger the safety of the maintenance personnel on the transmission line of the large power g...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/086
Inventor 王成楷王建安苏志龙
Owner 王建安
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