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An Additional Control Method Based on Instability Characteristic Quantities

A technology of additional control and feature quantity, applied in reactive power compensation, AC network voltage adjustment, reactive power adjustment/elimination/compensation, etc., can solve the problems of copying, different implementation methods, etc. The effect of safety, good market prospects

Active Publication Date: 2015-09-23
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, such a question was raised: Can an additional control measure be added between the second line of defense and the third line of defense to reduce the possibility of system out-of-sync? At least from the perspective of the time from the occurrence of the fault to the out-of-synchronization of the system, there is enough time to implement additional emergency control measures
[0005] At present, there is no special research on additional emergency control at home and abroad. In terms of stability judgment and control measures, the relevant research results of the second line of defense and the third line of defense can be used for reference. However, due to different control purposes, requirements and implementation methods, these The results cannot be completely or mostly copied, but it is necessary to study the stability judgment method and the additional control measure method suitable for additional emergency control, especially the practical method that can be directly applied to the power grid operation

Method used

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  • An Additional Control Method Based on Instability Characteristic Quantities
  • An Additional Control Method Based on Instability Characteristic Quantities
  • An Additional Control Method Based on Instability Characteristic Quantities

Examples

Experimental program
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Effect test

Embodiment 1

[0088] Embodiment 1 Embodiment of additional control discrimination method based on instability characteristic quantity in step C:

[0089] Take the North China-Central China UHV networking system of the "Sanhua" power grid as an example.

[0090] The UHV link Nanyang-Changzhi transmission line is 5000MW in the form of "south-to-north power transmission".

[0091] Table 2 shows the fixed value of the emergency control system feature value added to the tie line.

[0092] Table 2 The additional emergency control device on the Nanyang-Changzhi link line is set based on the pre-determined value of the instability characteristic quantity

[0093]

[0094]

[0095] Table 3 is the statistics of the calculation results of each parameter of the North China-Central China UHV tie line when different disturbance faults occur in different locations of the "Sanhua" power grid. Figure 2-Figure 9 All calculation examples are described in , and the proportions of feature quantities in...

Embodiment 2

[0106] Steps D, E, F in the graded timing difference in proportion to the additional emergency control embodiment:

[0107] Table 5 is the simulation calculation result of implementing the additional cut-off control measures for the "Sanhua" power grid by adopting the method of implementing additional control in proportion to the hierarchical timing difference in the present invention. Explanation of the results in the table:

[0108] (1) The rapidity of the power grid out-of-step prediction method based on the instability characteristic quantity is verified, which provides ample time for the implementation of additional control. For example, for the bipolar blockage of Fufeng HVDC and only 5 generating units in Xiangjiaba were disconnected, it was determined that the Nanyang-Changzhi line would be out of step in 2.28s by using the pre-judgment criterion based on the instability characteristic quantity, while The instability criterion can only be judged in 3.18s at the earlie...

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Abstract

The invention relates to an additional control method based on unsteady characteristic quantity. The method comprises the following steps: (A) determining additional emergency control objective and requirement, (B) determining an operating mode and a characteristic quantity definite value, prompting an additional control pre-judgment rule, and generating an additional control strategy table, (C) measuring and calculating a line characteristic quantity and determining a line steady state, (D) after out of step is judged, implementing additional control with a proportional classification timing difference, (E) detecting the change of the line characteristic quantity, and determining a subsequent additional control measure, (F) completing an additional control task after a system is determined to be steady, or stopping the additional control task after a situation that the additional control is failed is determined. According to the additional control method based on the unsteady characteristic quantity provided by the invention, the loss of synchronism of a system caused by the mismatching of second line stability control measures and serious failures is prevented between a second line and a third line, and the method has the advantages of simple principle, good effect, strong operability and strong practicality, a high practical value and a good market prospect.

Description

technical field [0001] The invention belongs to the technical field of power system stability control, and in particular relates to an additional control method based on instability characteristic quantities. Background technique [0002] The safety and stability control measures set in the power grid stipulate three lines of defense, of which the first line of defense requires the inherent control equipment and relay protection devices of the power system to quickly and correctly cut off the faulty components of the power system when a short-circuit fault occurs; According to the pre-considered fault form and operation mode, the first line of defense adopts the safety and stability control system (device) to implement control measures such as machine cutting, load shedding, and partial disconnection according to the predetermined control strategy to prevent the system from losing stability; the third line of defense consists of Out-of-step decoupling, frequency and voltage ...

Claims

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Application Information

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IPC IPC(8): H02J3/18H02J3/12
CPCY02E40/30
Inventor 吴丽华王青李晓珺林俊杰陈得治丁剑张志强马士英房大中孔祥玉赵帅张保会王怀远
Owner STATE GRID CORP OF CHINA
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