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Power grid frequency security degree dividing method and device for high power loss

A technology of grid frequency and safety level, applied in the electric power field, can solve the problems of high power loss and increased failure risk.

Active Publication Date: 2019-03-12
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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  • Application Information

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Problems solved by technology

[0004] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a method and device for dividing the power grid frequency security level for high power loss, aiming to solve the problem of a significant increase in the risk of high power loss failures faced by my country's power grid

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  • Power grid frequency security degree dividing method and device for high power loss
  • Power grid frequency security degree dividing method and device for high power loss
  • Power grid frequency security degree dividing method and device for high power loss

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specific Embodiment 1

[0087] Such as figure 1 As shown, the embodiment of the present invention provides a method for dividing the power grid frequency security level for large power loss, including:

[0088] Mapping step S101, determining the mapping relationship between the variation of the lowest point of the transient frequency of the power system and the variation of the quasi-steady state frequency to obtain a ratio coefficient;

[0089] The first calculation step S102 is to calculate the amount of change in the quasi-steady-state frequency of the system after the power grid is disturbed;

[0090] The second calculation step S103 is to calculate the minimum point of the transient frequency of the system by using the variation of the ratio coefficient and the quasi-steady-state frequency;

[0091] The dividing step S104 is to compare the relationship between the minimum transient frequency of the system after the disturbance occurs and the power threshold, and divide the power grid frequency ...

specific Embodiment 2

[0151] Such as image 3 As shown, the embodiment of the present invention provides a power grid frequency safety degree division device for large power loss, including:

[0152] The mapping module 201 is used to determine the mapping relationship between the variation of the lowest point of the transient frequency of the power system and the variation of the quasi-steady state frequency, and obtain the ratio coefficient;

[0153] The first calculation module 202 is used to calculate the amount of change in the quasi-steady-state frequency of the system after the power grid is disturbed;

[0154] The second calculation module 203 is used to calculate the minimum point of the transient frequency of the system by using the variation of the ratio coefficient and the quasi-steady-state frequency;

[0155] The dividing module 204 is used to compare the relationship between the lowest transient frequency of the system after the disturbance occurs and the power threshold, and divide ...

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Abstract

The invention discloses a power grid frequency security degree dividing method and device for high power loss. The method comprises steps of determining a mapping relationship between variation of lowest transient frequency of a power system and variation of quasi-steady state frequency, so as to obtain a ratio coefficient; calculating variation of quasi-steady state frequency of the system afterthe power grid is disturbed; calculating lowest transient frequency of the system by using the ratio coefficient and variation of the quasi-steady state frequency; and comparing the lowest transient frequency of the system after disturbance and a power threshold, and dividing power grid frequency security degrees. After disturbance, the lowest transient frequency of a specific system and the quasi-steady state frequency have an approximate ratio relationship, the lowest transient frequency of the system can be estimated roughly according to quasi-steady state frequency of the system, so as todetermine frequency security degree of the system; and the method is universal, and can adjust system frequency grading rules and grading number of a specific power grid, so as to determine power gridfrequency response emergency degree.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method and a device for dividing the frequency safety degree of a power grid for large power loss. Background technique [0002] With the gradual formation of UHV AC-DC hybrid power grid in my country, the large-scale grid-connection of new energy sources, and the improvement of national policy requirements such as energy conservation and environmental protection, the moment of inertia of my country's power grid has decreased, the primary frequency regulation capability has weakened, and thermal power units with small capacity have already Gradually replaced by large-capacity thermal power and nuclear power units, these transformations together have significantly increased the risk of high-power loss failures faced by my country's power grid. [0003] Patent CN108631301A discloses a safety margin division method considering multiple fast frequency response resources. The...

Claims

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 李晓萌饶宇飞刘阳赵华王骅高昆高泽田春笋晋萃萃李卫东
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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