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Wide area load shedding control method for quiescent voltage stabilization considering external power grid equivalence

A static voltage stabilization and control method technology, applied in the direction of AC network voltage adjustment, power network operating system integration, climate sustainability, etc., can solve the gap between rationality and effectiveness, rough equivalent methods, and cannot accurately reflect external systems And other issues

Inactive Publication Date: 2013-04-24
CHONGQING UNIV
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Problems solved by technology

The main disadvantages of this method are: this simple and rough equivalent method cannot accurately reflect the state of the external system and its impact on the static voltage stability of the regional power grid; There must be a big gap between the rationality and effectiveness of load shedding schemes

Method used

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  • Wide area load shedding control method for quiescent voltage stabilization considering external power grid equivalence
  • Wide area load shedding control method for quiescent voltage stabilization considering external power grid equivalence
  • Wide area load shedding control method for quiescent voltage stabilization considering external power grid equivalence

Examples

Experimental program
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Effect test

Embodiment

[0104] Static voltage stability and wide-area load shedding control for a regional power grid with 14 nodes.

[0105] Such as Figure 1~3 As shown, the specific steps of a static voltage stability wide-area load shedding control method considering the equivalent value of the external network are as follows: (1) Input the basic data of the regional power grid

[0106] First, input the basic data of the regional power grid, including the state estimation data of the regional power grid in two adjacent time intervals of 10 seconds, and the threshold value λ of the static voltage stability margin min , load growth margin λ E And the weight coefficient of each node load reduction.

[0107] attached figure 2 , 3 , the line data of the regional power grid is shown in the following table (the reference power of each standard value in the table is 100MVA, the same below):

[0108] first node number

end node number

Resistance (p.u.)

Reactance (p.u.)

Suscep...

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Abstract

The invention provides a wide area load shedding control method for quiescent voltage stabilization considering external power grid equivalence, belonging to the technical field of quiescent voltage stabilization analysis and control of electrical power systems. In the method, by using programs, a computer is used to calculate the Thevenin equivalent circuit of an external power grid, calculate quiescent voltage stability margin of an equivalent system, and solve a minimum load shedding optimization model so as to obtain a wide area load shedding scheme for a local power grid. Under the condition of unknown external power grid information, the method can be used to exactly calculate the quiescent voltage stability margin of the local power grid only relying on internal power grid information, and formulate a reasonable and effective wide area load shedding scheme for the local power grid. The method has the advantages of high calculation accuracy, fast optimization speed, strong engineering applicability and the like. The method provided by the invention is widely applied to the quiescent voltage stabilization wide area load shedding control of the local power grid connected with the external power grid by single points, particularly the quiescent voltage stabilization analysis and control of the local power grid by hierarchical and zoning management and schedule.

Description

technical field [0001] The invention belongs to the technical field of static voltage stability analysis and control of power systems, and in particular relates to a static voltage stable wide-area load shedding control method for a regional power grid connected to an external network through a single point. Background technique [0002] Voltage stability refers to the ability of the system voltage to maintain or recover to the allowable range without voltage collapse after the power system is disturbed. Generally, the method of studying voltage stability based on power flow equation and load static voltage characteristics is called static method, and the voltage stability problem studied through static models and methods is called static voltage stability. With the development of my country's national economy, the power load continues to grow rapidly. However, constrained by economic and environmental factors, the situation that my country's power supply and power grid con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/14H02J3/16
CPCY02E40/34Y02B70/3225Y04S20/222Y02E40/30
Inventor 颜伟赵霞余娟文一宇李旻庞晓艳周剑
Owner CHONGQING UNIV
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