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A fault defense online strategy table generation method, online security and stability emergency control method and system

An emergency control, safe and stable technology

Active Publication Date: 2021-05-18
NARI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current emergency control strategy has two kinds of offline strategy and online strategy. Due to the difference between the offline typical mode and the actual operation mode, the offline emergency control strategy has the risk of uneconomical and under-control caused by excessive control, which cannot guarantee the safety of the power grid. Online emergency control strategy The control strategy makes emergency control pre-decision based on the actual online operation mode, which effectively improves the adaptability of the control strategy to the power grid operation mode. The power grid operating equipment associated with the strategy mode changes, and the online emergency control strategy has a mismatch risk. Especially under the current power market transaction promotion and large-scale new energy grid connection conditions, the operation mode of the AC-DC hybrid power grid is complex and changeable. Planned and unplanned equipment commissioning and withdrawal are also becoming more frequent, and the risk of mismatching online emergency control strategies is increasing. It is necessary to make online security and stability emergency control decisions that adapt to equipment commissioning and withdrawal, and improve the reliability of online emergency control.
[0003] Although existing methods have improved the reliability of online emergency control under the condition that the switching status of power grid operation equipment associated with the control strategy mode is consistent with the decision-making time through online additional and advanced decision-making, and comprehensive optimization decision-making for transient static security and stability, but in When the switching status of power grid operation equipment associated with the policy mode at the time of fault occurrence and decision-making time changes, the online emergency control strategy still has the risk of mismatch, which is difficult to meet the practical requirements of online emergency control

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  • A fault defense online strategy table generation method, online security and stability emergency control method and system

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Embodiment 1

[0049] This embodiment is a method for generating a fault defense online policy table, including:

[0050] Obtain the current power grid operation status information S 0 , and in the preset future time period, the off-line strategy table corresponding to any expected fault F is used to judge the associated equipment for power grid operation mode, and the commissioning and withdrawing status information in the dispatching plan;

[0051] Based on the obtained information, the power flow calculation of the power grid is carried out to obtain the expected operating state data of the power grid: if there is a change in the operation and withdrawal of associated equipment in the preset future period, the expected operation state S of the power grid after the change in the operation and withdrawal of each associated equipment is calculated separately i ; Otherwise, calculate and obtain the expected operating state S of the power grid after the associated equipment currently in operat...

Embodiment 1-1

[0057] Based on Example 1, refer to figure 1 As shown, in the fault defense online strategy table generation method of this embodiment, it is defined that: the current moment is t 0 , and the current power grid operation state is denoted as S 0 , for the expected fault F, record the set of grid operation equipment associated with grid operation mode judgment in the safety and stability control off-line strategy table for defense against the fault as A;

[0058] According to the scheduling plan, if there is a change in the switching of equipment in A within the preset future period, the set of equipment that has changed in A is recorded as A1, m is the number of equipment in A1, and each equipment in A1 is recorded chronological order of throwing and withdrawing numbers and throwing and withdrawing status; otherwise, t 0 The set of equipment in operation at time A is recorded as A2, and n is the number of equipment in A2.

[0059] According to the scheduling plan, multiple d...

Embodiment 2

[0066] Based on the same inventive concept as Embodiment 1, this embodiment is a device for generating an online policy table for fault defense, including:

[0067] The data collection module is used to obtain the current power grid operation status information S 0 , and in the preset future time period, the off-line strategy table corresponding to any expected fault F is used to judge the associated equipment for power grid operation mode, and the commissioning and withdrawing status information in the dispatching plan;

[0068] The power flow calculation module is used to calculate the grid power flow based on the obtained information, and obtain the expected operating status data of the grid: if there is a change in the commissioning and withdrawing of associated equipment in the preset future period, the power grid after the corresponding change in the commissioning and withdrawing of each associated equipment is calculated separately Expected operating state S i ; Otherw...

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Abstract

The invention discloses a fault defense online strategy table generation method adapted to equipment switching, an online security and stability emergency control method and system, based on the current operating state of the power grid and combined with scheduling plan information to perform power flow calculation on associated equipment defined in the offline strategy table , to generate the expected state of the power grid after the associated equipment is switched on and off, and calculate the emergency control strategy for preventing faults according to the expected state of each grid, so that when a fault occurs, each associated equipment has a corresponding online emergency control strategy in different states of switching on and off. On the premise of not sacrificing decision-making speed and accuracy, the present invention solves the mismatch problem of online emergency control strategies for equipment switching and withdrawal changes by generating multiple groups of online strategies covering the switching and withdrawing status of related grid equipment in the strategy mode, and improves the online emergency control strategy. The adaptability and reliability of the control strategy meet the practical requirements of online emergency control.

Description

technical field [0001] The invention relates to the technical field of power system security and stability control, in particular to a method for generating an online fault defense strategy table adapting to equipment commissioning and withdrawal, and an online security and stability emergency control method and system. Background technique [0002] After the power system security and stability emergency control device detects a fault, it will implement corresponding control measures based on the emergency control strategy table by matching the power grid operation mode and fault to ensure the safe and stable operation of the power grid after a serious fault. The current emergency control strategy has two kinds of offline strategy and online strategy. Due to the difference between the offline typical mode and the actual operation mode, the offline emergency control strategy has the risk of uneconomical and under-control caused by excessive control, which cannot guarantee the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
CPCH02J3/00
Inventor 徐泰山任先成鲍颜红薛峰徐伟王胜明郑亮张金龙
Owner NARI TECH CO LTD
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