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Emergency Load Control Method in Isolated Grid Fault State

A technology of isolated power grid and fault state, applied in the field of power system security and stability control, can solve problems such as over-cut and under-cut, large load granularity, and power imbalance.

Active Publication Date: 2019-04-26
BEIJING SIFANG JIBAO AUTOMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since there is a 1% measurement error in the stability control system, and there are few controllable loads in the isolated power grid, and the load granularity is large, it is very easy to cause two situations of over-cutting and under-cutting, and the power imbalance caused by over-cutting and under-cutting is also Potentially large impact on frequency of isolated grids
The traditional low-frequency load shedding by frequency, in order to prevent frequent load adjustments, must consider delays, which cannot meet the time requirements for rapid balance of grid power when there is a large power shortage.

Method used

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  • Emergency Load Control Method in Isolated Grid Fault State
  • Emergency Load Control Method in Isolated Grid Fault State
  • Emergency Load Control Method in Isolated Grid Fault State

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Embodiment Construction

[0039] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0040] The emergency load control method in the isolated power grid fault state disclosed by the present invention is shown in the attached figure 1 shown, including the following steps:

[0041] (1) Monitor the real-time active power value of the generator in the isolated power grid and the tie line between the isolated power grid and the external power grid, and judge whether the generator has a tripping fault or a tie line disconnection fault. If so, perform step (2); if not, then Proceed to step (1);

[0042] (2) According to the active power difference of the isolated grid before and after the fault, the power deficit of the isolated grid is calculated as ΔP;

[0043] (3) The load shedding ΔP*K is connected by the stability control system of the isolated power grid and the DCS system of the generator distributed control system...

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Abstract

The invention discloses an emergency load control method under an isolated power grid fault state. The emergency load control method is characterized in that stability control, low-frequency load shedding, balancing resistance and DCS system control means are combined with one another, so that power grid power can be quickly balanced during large-power vacancy, quick recovery of power is realized, power is not reduced to be lower than a dangerous point, slight adjustment of frequency can be realized, and matching between load control quantity and power unbalance amount is realized to the greatest extent.

Description

technical field [0001] The invention belongs to the technical field of safety and stability control of electric power systems, and in particular relates to an emergency load control method under the fault state of an isolated power grid. Background technique [0002] Isolated power grid refers to a power grid that integrates all functions of "generation, transmission, distribution, and sales". It is widely used in various industries such as petroleum, chemical industry, and smelting. It can also refer to a regional distribution network independent of the public grid. There is no electrical connection or weak connection between the isolated grid and the large grid. The so-called weak connection means that under normal operating conditions, the large power grid has limited support for the frequency and voltage fluctuations of the isolated power grid, and in an emergency, the large power grid will disconnect the connection section with the isolated power grid, making it unplann...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/14H02J3/02
CPCH02J3/003H02J3/02H02J3/14Y02B70/3225Y04S20/222
Inventor 孙晓彦时伯年孙刚徐刚刘志超
Owner BEIJING SIFANG JIBAO AUTOMATION
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