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Method and system for acquiring power receiving capacity of regional power grid

A technology of regional power grid and power receiving capacity, applied in the field of power system, can solve the problems of increasing the power receiving scale of the regional power grid, large amount of calculation, and lack of approximate range of the power receiving scale of the system

Inactive Publication Date: 2019-06-07
CHINA ELECTRIC POWER RES INST +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For a certain regional power grid, there are two difficulties in obtaining power transmission capacity: one is the need to judge serious faults and weak links through simulation; Fault simulation is carried out after the scale of the power grid, and finally the power receiving capacity of the regional power grid is determined
All of these require a large amount of calculation. The main calculation amount is: 1. Finding serious faults and weak links; ; 2. There is no guidance on the general scope of the system's power receiving scale

Method used

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  • Method and system for acquiring power receiving capacity of regional power grid
  • Method and system for acquiring power receiving capacity of regional power grid
  • Method and system for acquiring power receiving capacity of regional power grid

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Embodiment Construction

[0036] The regional power grid system of the present invention has a stand-alone infinite system such as figure 2 Shown:

[0037] in

[0038]

[0039] A=P m (δ c -δ 0 )

[0040]

[0041] When A=B, it is the boundary condition of the limit cutting angle and the limit operating power, at this time,

[0042] Have

[0043]

[0044] then there is

[0045]

[0046] Through the above formula can be drawn when U 1 , U 2 , X are both 1 when P m and δ 0 ,δ c relationship between, such as image 3 shown;

[0047] can be obtained when δ 0 ,δ c near time P m Reaches the maximum value.

[0048] At the operating point, there is therefore,

[0049] Have

[0050]

[0051] which is

[0052] cosδ 0 +cosδ c =(π-2δ 0 ) sin δ 0

[0053] δ 0 and δ c The relationship between Figure 4 shown;

[0054] sin(δ 0 ) and δ c The relationship between Figure 5 shown;

[0055] Due to δ 0 must be less than δ c ,therefore Figure 4 In the curve, only the par...

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Abstract

The invention discloses a method and system for acquiring power receiving capacity of a regional power grid and belongs to the technical field of electric power systems. The method comprises the stepsof determining the most serious fault and the weakest line of a regional power grid system: calculating the ratio of the power on the weakest line to the maximum power of the line after in the initial state of the regional power grid, the most serious fault occurs, causing transfer of power flow; determining the maximum power receiving capacity of the regional power grid to be m times of the initial receiving power; 1.1, adjusting the power flow of the regional power grid; 1.2, determining the most serious fault and the weakest line; 1.3, performing time domain simulation on the fault and checking whether the regional power grid system is unstable or not; and 1.4, acquiring the maximum power receiving capacity of the regional system. According to the method and the system in the invention, the ratio of a power flow transfer value caused on other lines after the fault of a certain line of the regional system power transmission section in different states to the maximum power transmission power of the line is given, a line fragile factor is obtained, and the most serious fault and the weakest line of the system can be determined according to the size of the line fragile factor.

Description

technical field [0001] The present invention relates to a power system, and more specifically, to a method and system for obtaining power receiving capacity of a regional power grid. Background technique [0002] For a certain regional power grid, there are two difficulties in obtaining power transmission capacity: one is the need to judge serious faults and weak links through simulation; Fault simulation is carried out after the power scale is determined, and finally the power receiving capacity of the regional power grid is determined. All of these require a large amount of calculation. The main calculation amount is: 1. Finding serious faults and weak links; ; Second, there is a lack of guidance on the general scope of the power receiving scale of the system. Contents of the invention [0003] In view of the above problems, the present invention proposes a method for obtaining the power receiving capacity of the regional power grid, including: [0004] Obtain the thr...

Claims

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Application Information

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IPC IPC(8): H02J3/00
Inventor 孙玉娇周勤勇王海潜张健祁万春张一驰王荃荃邵瑶彭竹弈覃琴
Owner CHINA ELECTRIC POWER RES INST
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